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delphi实现bmp与jpg图像相互转换及位图大小调整delphi实现bmp与jpg图像相互转换及位图大小调整摘要：本文介绍了如何通过delphi编码实现bmp格式图像与jpeg格式图像的相互转换以及bmp格式图像的大小的调整。
在图片处理操作中使用了几个api函数，其算法同样适用于其他编程语言。
关键词：图形转换、图片调整在很多MIS系统或者其他管理信息系统中，有需要用户上传照片到数据库等对图片的操作，根据系统需求不同，可能需要对这些照片进行格式转换或者大小的调整。
这里有三个在MIS系统或者其他管理信息系统中比较常用的图片处理过程，与大家分享。
1、 Bmp格式转换位jpg（jpeg）格式。
进程：Image_BitmapToJPeg实现bmp格式图片到Jpg（jpeg）格式图片的转换，如下：{参数介绍:FileName:要转换的位图的路径及名称SaveFileName:转换后生成 jpg图形的路径及名称}Procedure Image_BitmapT oJPeg(Const FileName: String;Sav eFileName:String=''); VarBitmap: TBitmap; //定义变量JPeg: TJPegImage; //所属unit是:Jpeg,需要在项目的uses 中加入Jpeg Begin TryBitmap := TBitmap.Create; //创建位图资源Bitmap.LoadFromFile(FileName); //根据传入的参数载入位图资源 JPeg := TJPegImage.Create; //创建jpeg资源JPeg.Assign(Bitmap); //把bitmap中的图像资源拷贝到jpeg对象中IF Trim(SaveFileName)='' Then //如果传入的目的地址为空,按原名保存(扩展名改变) JPeg.SaveToFile(ChangeFileExt(FileName, '.jpg')) Else //按参数指定的名称保存jpg图片 JPeg.SaveToFile(SaveFileName);FinallyFreeAndNil(Bitmap); //释放资源 FreeAndNil(JPeg); //释放资源 End; End;从上面的代码及其注释中我们可以看出程序思路，首先分别定义并创建bmp对象Bitmap和jpeg对象JPeg，然后在Bitmap对象载入位图后，把Bitmap中的图像资源复制到Jpeg中，最后把Jpeg保存到磁盘并释放创建的对象。
delphi中处理sqlserver中的image、text字段下面通过详细的例子来讲述如何在delphi中处理sql server中的image、text字段。
因为实际开发的需要，我们需要处理的是text类型的字段，包括读和写。
网上很多相关的文章都是讲述的对image的读写操作，下面首先介绍如何将图象存储在sql server的image字段。
其中DataMConn为一个针对数据库操作的单元，放置一个ADOConnection,一个ADOQuery //image to database procedure TfrmText.Button1Click(Sender: TObject);varbm:tbitmap;ms:TMemoryStream;beginms:=TMemoryStream.Create;bm:=TBitmap.Create;bm.Assign(image1.Picture.Bitmap);bm.SaveToStream(ms);with DataMConn.ADOQHistory dobeginClose;SQL.Clear;SQL.Add('INSERT INTO Package(PackageID,TempPackage) VALUES(:x,:y)');Parameters.ParamByName('y').LoadFromStream(ms,ftBlob);Parameters.ParamByName('x').Value := 'aaaaa';ExecSQL;end;end;//show imageprocedure TfrmText.Button2Click(Sender: TObject);varStream:TStream;bm:tbitmap;beginwith DataMConn.ADOQHistory dobeginClose;SQL.Clear;SQL.Add('SELECT * FROM Package WHERE packageID= ''aaaaa''');TryOpen;stream := DataMConn.ADOQHistory.CreateBlobStream(FieldByName('T em pPackage'),bmRead);bm:=TBitmap.Create;bm.LoadFromStream(stream);image2.Picture.bitmap.Assign(bm);stream.Free;exceptbeginShowMessage('Error!');Exit;end;end;//tryend;end;下面的两个例子是如何处理text类型的字段，其中读取的时候，利用了一个TDBMemo控件，来加载读取的流数据，然后赋值给一个WideString类型的变量str//text to streamprocedure TfrmText.Button3Click(Sender: TObject);varstr : WideString;ss:TStringStream;i : integer;beginstr := 'sstrstrststrstrststrstrstrsttrstrstrrstrstr';for i := 1 to 10000 dobeginstr := str + 'sstrstrststrstrststrstrstrsttrstrstrrstrstr'; //43万多个字节end;str := str + 'E';ss := TStringStream.Create(str);//bm:=TBitmap.Create;//bm.Assign(image1.Picture.Bitmap);//bm.SaveToStream(ms);with DataMConn.ADOQHistory dobeginClose;SQL.Clear;SQL.Add('INSERT INTO tPackage(PackageID,TempPackage) VALUES(:x,:y)');Parameters.ParamByName('y').LoadFromStream(ss,ftMemo);Parameters.ParamByName('x').Value := 'aaaaa';ExecSQL;end;end;//read text to a TDBMemoprocedure TfrmText.Button4Click(Sender: TObject);varstream : TStream;str : WideString;beginwith DataMConn.ADOQHistory dobeginClose;SQL.Clear;SQL.Add('SELECT TempPackage FROM tPackage WHERE packageID= ''aaaaa''');Open;if not IsEmpty thenbeginStream := DataMConn.ADOQHistory.CreateBlobStream(FieldByName('T em pPackage'),bmRead);stream.Position := 0;AMemo.Lines.LoadFromStream(stream);stream.Free;end;end;end;//下面是把text字段的数据内容直接读到一个WideString中，而不通过TDBMemo，因为在实际中，不知道何种原因，线程读到数据后，只能在第一次处理时正常，然后再用鼠标点应用程序，程序就停了……who knows the reason , pls tell me & 3ksprocedure TfrmText.Button5Click(Sender: TObject);varBuffer: PChar;MemSize: Integer;Stream: TStream;str : WideString;beginwith DataMConn.ADOQHistory dobeginClose;SQL.Clear;SQL.Add('SELECT TempPackage FROM tPackage WHERE packageID= ''aaaaa''');Open;if not IsEmpty thenbeginStream := DataMConn.ADOQHistory.CreateBlobStream(FieldByName('T em pPackage'),bmRead);tryMemSize := Stream.Size;Inc(MemSize); //Make room for the buffer's null terminator.Buffer := AllocMem(MemSize); //Allocate the memory.tryStream.Read(Buffer^, MemSize); //Read TempPackage field into buffer.str := Buffer;finallyFreeMem(Buffer, MemSize);end;finallyStream.Free;end;end;end;end;如何用流的方法向SQLServer数据库中读写blob的image字段varTempStream: TMemoryStream;begin//ReadTempStream := TMemoryStream.Create;tryTBlobField(FieldByName('ImageField')).SaveToStream; TempStream.Position := 0;Memo1.Lines.LoadFromStream(TempStream);FinallyTempStream.Free;end;//WriteTempStream := TMemoryStream.Create;tryMemo1.Lines.SaveToStream(TempStream);//Image1.Picture.Bitmap.LoadFromStream(TempStream); TBlobField(FieldByName('ImageField')).LoadFromStream; FinallyTempStream.Free;end;end;varaStream1 : TStream;jpg : tjpegimage; //在uses 加入 jpeg,db 单元插入jpg := tjpegimage.Create();trydm.Query_image.open;dm.query_image.insert;aStream1 := dm.query_image.CreateBlobStream(dm.query_image.FieldByNa me('content'),bmReadWrite);jpg.LoadFromFile(name);jpg.SaveToStream(aStream1);aStream1.Free;dm.query_image.Post;finallyjpg.Free;end;取出if dm.query_image.State <> dsBrowse then exit;if dm.query_image.FieldByName('content').IsNull then Exit; //判断状态，content是我表里存放jpeg的fielddm.query_image.open;aStream1 := dm.query_image.CreateBlobStream(dm.query_image.FieldByNa me('content'), bmRead);tryaStream1.Position := 0;jpg:= tjpegimage.Create();tryjpg.LoadFromStream(aStream1);jpg.SaveToFile(ipath); //ipath:string 存放路径与文件名finallyjpg.Free;end;finallyaStream1.Free;end;end;文件写入字段：SQLstr:='INSERT INTO 表名(...,Image字段名,...）VALUES (...,:Image,...)';Query.SQL.Add(SQLstr);Query.SQL.ParamByName('Image').LoadFromFile(图象文件名);Query.ExecSQL;从字段写入文件：SQLstr:='SELECT ...,Image字段名，... FROM 表名 WHERE...';Query.Close;Query.SQL.Clear;Query.SQL.Add(SQLstr);Query.Open;(Query.FieldByName(Image字段名) as TBlobField).SaveToFile(文件名）;//或TBlobField(Query.FieldByName(Image字段名)).SaveToFile(文件名）;向SQL Server插入带有Image字段的记录向SQL Server插入记录相信大家都会做，但是如果表中带有Image字段就不好弄了，这里有一个例子，非常安全，同时也向大家展示动态生成控件的技巧！在SQL Server中建立TEST表，两个字段，id varchar(10),photo image(16);procedure TForm1.BitBtn1Click(Sender: TObject);beginopenpicturedialog1.execute;image1.picture.loadfromfile(openpicturedialog1.filename);end;procedure TForm1.BitBtn2Click(Sender: TObject);vargraphic1:Timage;begingraphic1:=Timage.Create(self);graphic1.picture.loadfromfile(openpicturedialog1.filename);table1.Open;table1.insert;table1.fieldbyname(’id’).asstring:=’121’;table1.fields[1].assign(graphic1.Picture);table1.post;table1.close;graphic1.free;end;显示可用：DBIMAGE控件显示！DELPHI存取JPEG文件到SQL Server数据库unit Unit1;interfaceusesWindows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,ExtCtrls, DBCtrls, Grids, DBGrids, Db, ADODB,jpeg, StdCtrls,dbtables;{一定要USES JPEG单元,使能存储JPG文件格式}typeTForm1 = class(TForm)DataSource1: TDataSource;ADOQuery1: TADOQuery;DBGrid1: TDBGrid;DBNavigator1: TDBNavigator;Image1: TImage;savebutton: TButton;showbutton: TButton;OpenDialog1: TOpenDialog;ADOQuery1id: TIntegerField;ADOQuery1pic: TBlobField;procedure savebuttonClick(Sender: TObject);procedure showbuttonClick(Sender: TObject);procedure DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);private{ Private declarations }public{ Public declarations }end;varForm1: TForm1;implementation{$R *.DFM}function JpegStartsInBlob(PicField:TBlobField):integer;varghy: TADOBlobstream;buffer:Word;hx: string;beginResult := -1;ghy := TADOBlobstream.Create(PicField, bmRead);trywhile (Result = -1) and (ghy.Position + 1 < ghy.Size) dobeginghy.ReadBuffer(buffer, 1);hx:=IntToHex(buffer, 2);if hx = ’FF’ then b eginghy.ReadBuffer(buffer, 1);hx:=IntToHex(buffer, 2);if hx = ’D8’ then Result := ghy.Position - 2else if hx = ’FF’ thenghy.Position := ghy.Position-1;end; //ifend; //whilefinallyghy.Freeend; //tryend;procedure TForm1.savebuttonClick(Sender: TObject);varpicstream:tadoblobstream;beginadoquery1.edit;picstream:=tadoblobstream.Create(tblobfield(adoquery1.fie lds[1]),bmWrite);if form1.opendialog1.execute thenbeginpicstream.LoadFromFile(opendialog1.filename);picstream.Position:=0;adoquery1.edit;tblobfield(adoquery1.Fields[1]).loadfromstream(picstream);adoquery1.post;end;end;procedure TForm1.showbuttonClick(Sender: TObject);varghy:TADOBlobstream;pic:tjpegimage;beginghy := TADOBlobstream.Create(Adoquery1pic, bmRead);tryghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning );Pic:=TJpegImage.Create;tryPic.LoadFromStream(ghy);Image1.Picture.Graphic:=Pic;finallyPic.Free;end;finallyghy.Freeend;end;procedure TForm1.DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);beginif button in [nbFirst, nbPrior, nbNext, nbLast] thenshowbutton.Click;end;end.如果数据库中要存储的是BMP文件，则在procedure TForm1.showbuttonClick(Sender: TObject);过程中代码更改如下即可存储显示BMP文件格式的操作。
本文实例汇总了Delphi基本图像处理方法。
分享给大家供大家参考。
具体分析如下： //浮雕 procedureEmboss(SrcBmp,DestBmp:TBitmap;AzimuthChange:integer;overload; var i, j, Gray, Azimuthvalue, R, G, B: integer; SrcRGB, SrcRGB1, SrcRGB2, DestRGB: pRGBTriple; begin for i := 0 to SrcBmp.Height - 1 do begin SrcRGB := SrcBmp.ScanLine[i]; DestRGB := DestBmp.ScanLine[i]; if (AzimuthChange >= -180 and (AzimuthChange < -135 then begin if i > 0 then SrcRGB1 := SrcBmp.ScanLine[i-1] else SrcRGB1 := SrcRGB; Inc(SrcRGB1; SrcRGB2 := SrcRGB; Inc(SrcRGB2; end else if (AzimuthChange >= -135 and (AzimuthChange < -90 then begin if i > 0 thenSrcRGB1 := SrcBmp.ScanLine[i-1] else SrcRGB1 := SrcRGB; SrcRGB2 := SrcRGB1; Inc(SrcRGB2; end else if (AzimuthChange >= -90 and (AzimuthChange < -45 then begin if i > 0 then SrcRGB1 := SrcBmp.ScanLine[i-1] else SrcRGB1 := SrcRGB; SrcRGB2 := SrcRGB1; end else if (AzimuthChange >= -45 and (AzimuthChange < 0 then begin SrcRGB1 := SrcRGB; if i > 0 then SrcRGB2 := SrcBmp.ScanLine[i-1] else SrcRGB2 := SrcRGB; end else if (AzimuthChange >= 0 and (AzimuthChange < 45 then begin SrcRGB2 := SrcRGB; if (i < SrcBmp.Height - 1 then SrcRGB1 := SrcBmp.ScanLine[i+1] else SrcRGB1 := SrcRGB; end else if (AzimuthChange >= 45 and (AzimuthChange < 90 then begin if (i < SrcBmp.Height - 1 then SrcRGB1 := SrcBmp.ScanLine[i+1] else SrcRGB1 := SrcRGB; SrcRGB2 := SrcRGB1; end else if (AzimuthChange >= 90 and (AzimuthChange < 135 then begin if (i < SrcBmp.Height - 1 then SrcRGB1 := SrcBmp.ScanLine[i+1] else SrcRGB1 := SrcRGB; SrcRGB2 := SrcRGB1; Inc(SrcRGB1; end else if (AzimuthChange >= 135 and (AzimuthChange <= 180 then begin if (i < SrcBmp.Height - 1 then SrcRGB2 := SrcBmp.ScanLine[i+1] else SrcRGB2 := SrcRGB; Inc(SrcRGB2; SrcRGB1 := SrcRGB; Inc(SrcRGB1; end; for j := 0 to SrcBmp.Width - 1 do begin if (AzimuthChange >= -180 and (AzimuthChange < -135 then begin Azimuthvalue := AzimuthChange + 180; R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= -135 and (AzimuthChange < -90 then begin Azimuthvalue := AzimuthChange + 135; R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= -90 and (AzimuthChange < -45 then begin if j=1 then Inc(SrcRGB1,-1; Azimuthvalue := AzimuthChange + 90;R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= -45 and (AzimuthChange < 0 then begin if j=1 then begin Inc(SrcRGB1,-1; Inc(SrcRGB2,-1; end; Azimuthvalue := AzimuthChange + 45; R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= 0 and (AzimuthChange < 45 then begin if j=1 then begin Inc(SrcRGB1,-1; Inc(SrcRGB2,-1; end; Azimuthvalue := AzimuthChange; R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= 45and (AzimuthChange < 90 then begin if j=1 then Inc(SrcRGB2,-1; Azimuthvalue := AzimuthChange - 45; R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= 90 and (AzimuthChange < 135 then begin Azimuthvalue := AzimuthChange - 90;R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end else if (AzimuthChange >= 135 and (AzimuthChange <= 180 then begin Azimuthvalue := AzimuthChange - 135;R:=SrcRGB.rgbtRed-((SrcRGB1.rgbtRed*Azimuthvalue div 45-((SrcRGB2.rgbtRed*(45-Azimuthvalue div 45+78; G:=SrcRGB.rgbtGreen-((SrcRGB1.rgbtGreen*Azimuthvalue div 45-((SrcRGB2.rgbtGreen*(45-Azimuthvalue div 45+78; B:=SrcRGB.rgbtBlue-((SrcRGB1.rgbtBlue*Azimuthvalue div 45-((SrcRGB2.rgbtBlue*(45-Azimuthvalue div 45+78; end; R:=Min(R,255; R:=Max(R,0; G:=Min(G,255; G:=Max(G,0; B:=Min(B,255; B:=Max(B,0; Gray := (R shr 2 + (R shr 4 + (G shr 1 + (G shr 4 + (B shr 3; DestRGB.rgbtRed:=Gray; DestRGB.rgbtGreen:=Gray; DestRGB.rgbtBlue:=Gray; if (j=-180 and (AzimuthChange<-135 or ((AzimuthChange>=90 and (AzimuthChange<=180 then begin Inc(SrcRGB1; end; if (j=135 and (AzimuthChange<180 or ((AzimuthChange>=-180 and (AzimuthChange<=-90 then begin Inc(SrcRGB2; end;Inc(SrcRGB; Inc(DestRGB; end; end; end; procedureEmboss(Bmp:TBitmap;AzimuthChange:integer;ElevationChange:integer;WeightChange: integer;overload; var DestBmp:TBitmap; begin DestBmp:=TBitmap.Create; DestBmp.Assign(Bmp;Emboss(Bmp,DestBmp,AzimuthChange,ElevationChange,WeightChange;Bmp.Assign(DestBmp; end; //反色 procedure Negative(Bmp:TBitmap; var i, j: Integer; PRGB: pRGBTriple; begin Bmp.PixelFormat:=pf24Bit; for i := 0 to Bmp.Height - 1 do begin PRGB := Bmp.ScanLine[i]; for j := 0 to Bmp.Width - 1 do beginPRGB^.rgbtRed :=not PRGB^.rgbtRed ; PRGB^.rgbtGreen :=not PRGB^.rgbtGreen; PRGB^.rgbtBlue :=not PRGB^.rgbtBlue; Inc(PRGB; end; end; end; //曝光 procedure Exposure(Bmp:TBitmap; var i, j: integer; PRGB: pRGBTriple; beginBmp.PixelFormat:=pf24Bit; for i := 0 to Bmp.Height - 1 do begin PRGB :=Bmp.ScanLine[i]; for j := 0 to Bmp.Width - 1 do begin if PRGB^.rgbtRed<128 then PRGB^.rgbtRed :=not PRGB^.rgbtRed ; if PRGB^.rgbtGreen<128 thenPRGB^.rgbtGreen :=not PRGB^.rgbtGreen; if PRGB^.rgbtBlue<128 thenPRGB^.rgbtBlue :=not PRGB^.rgbtBlue; Inc(PRGB; end; end; end; //模糊 procedure Blur(SrcBmp:TBitmap; var i, j:Integer; SrcRGB:pRGBTriple; SrcNextRGB:pRGBTriple; SrcPreRGB:pRGBTriple; Value:Integer; procedure IncRGB; begin Inc(SrcPreRGB;Inc(SrcRGB; Inc(SrcNextRGB; end; procedure DecRGB; begin Inc(SrcPreRGB,-1;Inc(SrcRGB,-1; Inc(SrcNextRGB,-1; end; begin SrcBmp.PixelFormat:=pf24Bit; for i := 0 to SrcBmp.Height - 1 do begin if i > 0 then SrcPreRGB:=SrcBmp.ScanLine[i-1] else SrcPreRGB := SrcBmp.ScanLine[i]; SrcRGB := SrcBmp.ScanLine[i]; if i <SrcBmp.Height - 1 then SrcNextRGB:=SrcBmp.ScanLine[i+1] elseSrcNextRGB:=SrcBmp.ScanLine[i]; for j := 0 to SrcBmp.Width - 1 do begin if j > 0 then DecRGB; Value:=SrcPreRGB.rgbtRed+SrcRGB.rgbtRed+SrcNextRGB.rgbtRed; if j > 0 then IncRGB;Value:=Value+SrcPreRGB.rgbtRed+SrcRGB.rgbtRed+SrcNextRGB.rgbtRed; if j < SrcBmp.Width - 1 then IncRGB;Value:=(Value+SrcPreRGB.rgbtRed+SrcRGB.rgbtRed+SrcNextRGB.rgbtRed div 9; DecRGB; SrcRGB.rgbtRed:=value;if j > 0 then DecRGB;Value:=SrcPreRGB.rgbtGreen+SrcRGB.rgbtGreen+SrcNextRGB.rgbtGreen; if j > 0 thenIncRGB;Value:=Value+SrcPreRGB.rgbtGreen+SrcRGB.rgbtGreen+SrcNextRGB.rgbtGreen; if j < SrcBmp.Width - 1 then IncRGB;Value:=(Value+SrcPreRGB.rgbtGreen+SrcRGB.rgbtGreen+SrcNextRGB.rgbtGreen div 9; DecRGB; SrcRGB.rgbtGreen:=value; if j > 0 then DecRGB;Value:=SrcPreRGB.rgbtBlue+SrcRGB.rgbtBlue+SrcNextRGB.rgbtBlue; if j > 0 then IncRGB; Value:=Value+SrcPreRGB.rgbtBlue+SrcRGB.rgbtBlue+SrcNextRGB.rgbtBlue; if j < SrcBmp.Width - 1 then IncRGB;Value:=(Value+SrcPreRGB.rgbtBlue+SrcRGB.rgbtBlue+SrcNextRGB.rgbtBlue div 9; DecRGB; SrcRGB.rgbtBlue:=value; IncRGB; end; end; end; //锐化 procedureSharpen(SrcBmp:TBitmap; var i, j: integer; SrcRGB: pRGBTriple; SrcPreRGB: pRGBTriple; Value: integer; begin SrcBmp.PixelFormat:=pf24Bit; for i := 0 to SrcBmp.Height - 1 do begin SrcRGB := SrcBmp.ScanLine[i]; if i > 0 then SrcPreRGB:=SrcBmp.ScanLine[i-1] else SrcPreRGB:=SrcBmp.ScanLine[i]; for j := 0 to SrcBmp.Width - 1 do begin if j = 1 then Dec(SrcPreRGB;Value:=SrcRGB.rgbtRed+(SrcRGB.rgbtRed-SrcPreRGB.rgbtRed div 2;Value:=Max(0,Value; Value:=Min(255,Value; SrcRGB.rgbtRed:=value;Value:=SrcRGB.rgbtGreen+(SrcRGB.rgbtGreen-SrcPreRGB.rgbtGreen div 2;Value:=Max(0,Value; Value:=Min(255,Value; SrcRGB.rgbtGreen:=value;Value:=SrcRGB.rgbtBlue+(SrcRGB.rgbtBlue-SrcPreRGB.rgbtBlue div 2;Value:=Max(0,Value; Value:=Min(255,Value; SrcRGB.rgbtBlue:=value; Inc(SrcRGB; Inc(SrcPreRGB; end; end; end; [图像的旋转和翻转] 以下代码用ScanLine配合指针移动实现，用于24位色！ //旋转90度 procedure Rotate90(const Bitmap:TBitmap; var i,j:Integer; rowIn,rowOut:pRGBTriple; Bmp:TBitmap; Width,Height:Integer; begin Bmp:=TBitmap.Create; Bmp.Width := Bitmap.Height; Bmp.Height := Bitmap.Width; Bmp.PixelFormat := pf24bit; Width:=Bitmap.Width-1; Height:=Bitmap.Height-1; for j := 0 to Height do begin rowIn := Bitmap.ScanLine[j]; for i := 0 to Width do beginrowOut := Bmp.ScanLine[i]; Inc(rowOut,Height - j; rowOut^ := rowIn^; Inc(rowIn; end;end; Bitmap.Assign(Bmp; end; //旋转180度 procedure Rotate180(constBitmap:TBitmap; var i,j:Integer; rowIn,rowOut:pRGBTriple; Bmp:TBitmap;Width,Height:Integer; begin Bmp:=TBitmap.Create; Bmp.Width := Bitmap.Width; Bmp.Height := Bitmap.Height; Bmp.PixelFormat := pf24bit; Width:=Bitmap.Width-1; Height:=Bitmap.Height-1; for j := 0 to Height do begin rowIn := Bitmap.ScanLine[j]; for i := 0 to Width do begin rowOut := Bmp.ScanLine[Height - j]; Inc(rowOut,Width - i; rowOut^ := rowIn^; Inc(rowIn; end; end; Bitmap.Assign(Bmp; end; //旋转270度procedure Rotate270(const Bitmap:TBitmap; var i,j:Integer; rowIn,rowOut:pRGBTriple; Bmp:TBitmap; Width,Height:Integer; begin Bmp:=TBitmap.Create; Bmp.Width := Bitmap.Height; Bmp.Height := Bitmap.Width; Bmp.PixelFormat :=pf24bit; Width:=Bitmap.Width-1; Height:=Bitmap.Height-1; for j := 0 to Height do begin rowIn := Bitmap.ScanLine[j]; for i := 0 to Width do begin rowOut :=Bmp.ScanLine[Width - i]; Inc(rowOut,j; rowOut^ := rowIn^; Inc(rowIn; end; end; Bitmap.Assign(Bmp; end; //任意角度 functionRotateBitmap(Bitmap:TBitmap;Angle:Integer;BackColor:TColor:TBitmap; vari,j,iOriginal,jOriginal,CosPoint,SinPoint : integer; RowOriginal,RowRotated : pRGBTriple; SinTheta,CosTheta : Extended; AngleAdd : integer; beginResult:=TBitmap.Create; Result.PixelFormat := pf24bit;Result.Canvas.Brush.Color:=BackColor; Angle:=Angle Mod 360; if Angle<0 then Angle:=360-Abs(Angle; if Angle=0 then Result.Assign(Bitmap else if Angle=90 then begin Result.Assign(Bitmap; Rotate90(Result;//如果是旋转90度，直接调用上面的代码 end else if (Angle>90 and (Angle<180 then begin AngleAdd:=90; Angle:=Angle-AngleAdd; end else if Angle=180 then begin Result.Assign(Bitmap; Rotate180(Result;//如果是旋转180度，直接调用上面的过程 end else if (Angle>180 and (Angle<270 then begin AngleAdd:=180; Angle:=Angle-AngleAdd; end else if Angle=270 then begin Result.Assign(Bitmap; Rotate270(Result;//如果是旋转270度，直接调用上面的过程end else if (Angle>270 and (Angle<360 then begin AngleAdd:=270; Angle:=Angle-AngleAdd; end else AngleAdd:=0; if (Angle>0 and (Angle<90 then begin SinCos((Angle+ AngleAdd * Pi / 180, SinTheta, CosTheta; if (SinTheta * CosTheta < 0 then begin Result.Width := Round(Abs(Bitmap.Width * CosTheta - Bitmap.Height * SinTheta; Result.Height := Round(Abs(Bitmap.Width * SinTheta - Bitmap.Height * CosTheta; end else begin Result.Width := Round(Abs(Bitmap.Width * CosTheta + Bitmap.Height * SinTheta; Result.Height := Round(Abs(Bitmap.Width * SinTheta + Bitmap.Height * CosTheta; end; CosTheta:=Abs(CosTheta; SinTheta:=Abs(SinTheta; if (AngleAdd=0 or (AngleAdd=180 then begin CosPoint:=Round(Bitmap.Height*CosTheta;SinPoint:=Round(Bitmap.Height*SinTheta; end else beginSinPoint:=Round(Bitmap.Width*CosTheta; CosPoint:=Round(Bitmap.Width*SinTheta; end; for j := 0 to Result.Height-1 do begin RowRotated := Result.Scanline[j]; for i := 0 to Result.Width-1 do begin Case AngleAdd of 0: begin jOriginal := Round((j+1*CosTheta-(i+1-SinPoint*SinTheta-1; iOriginal := Round((i+1*CosTheta-(CosPoint-j-1*SinTheta-1; end; 90: begin iOriginal := Round((j+1*SinTheta-(i+1-SinPoint*CosTheta-1; jOriginal := Bitmap.Height-Round((i+1*SinTheta-(CosPoint-j-1*CosTheta; end; 180: begin jOriginal := Bitmap.Height-Round((j+1*CosTheta-(i+1-SinPoint*SinTheta; iOriginal := Bitmap.Width-Round((i+1*CosTheta-(CosPoint-j-1*SinTheta; end; 270: begin iOriginal := Bitmap.Width-Round((j+1*SinTheta-(i+1-SinPoint*CosTheta; jOriginal := Round((i+1*SinTheta-(CosPoint-j-1*CosTheta-1; end; end; if (iOriginal >= 0 and (iOriginal <= Bitmap.Width-1and (jOriginal >= 0 and (jOriginal <=Bitmap.Height-1 then begin RowOriginal := Bitmap.Scanline[jOriginal];Inc(RowOriginal,iOriginal; RowRotated^ := RowOriginal^; Inc(RowRotated; end else begin Inc(RowRotated; end; end; end; end; end; //水平翻转 procedure FlipHorz(const Bitmap:TBitmap; var i,j:Integer; rowIn,rowOut:pRGBTriple; Bmp:TBitmap;Width,Height:Integer; begin Bmp:=TBitmap.Create; Bmp.Width := Bitmap.Width; Bmp.Height := Bitmap.Height; Bmp.PixelFormat := pf24bit; Width:=Bitmap.Width-1; Height:=Bitmap.Height-1; for j := 0 to Height do begin rowIn := Bitmap.ScanLine[j]; for i := 0 to Width do begin rowOut := Bmp.ScanLine[j]; Inc(rowOut,Width - i; rowOut^ := rowIn^; Inc(rowIn; end; end; Bitmap.Assign(Bmp; end; //垂直翻转 procedureFlipVert(const Bitmap:TBitmap; var i,j:Integer; rowIn,rowOut:pRGBTriple;Bmp:TBitmap; Width,Height:Integer; begin Bmp:=TBitmap.Create; Bmp.Width := Bitmap.Height; Bmp.Height := Bitmap.Width; Bmp.PixelFormat := pf24bit;Width:=Bitmap.Width-1; Height:=Bitmap.Height-1; for j := 0 to Height do beginrowIn := Bitmap.ScanLine[j]; for i := 0 to Width do begin rowOut :=Bmp.ScanLine[Height - j]; Inc(rowOut,i; rowOut^ := rowIn^; Inc(rowIn; end; end; Bitmap.Assign(Bmp; end; [亮度、对比度、饱和度的调整] 以下代码用ScanLine配合指针移动实现！ function Min(a, b: integer: integer; begin if a < b then result := a else result := b; end; function Max(a, b: integer: integer; begin if a > b then result := a else result := b; end; //亮度调整 procedure BrightnessChange(constSrcBmp,DestBmp:TBitmap;ValueChange:integer; var i, j: integer; SrcRGB, DestRGB: pRGBTriple; begin for i := 0 to SrcBmp.Height - 1 do begin SrcRGB :=SrcBmp.ScanLine[i]; DestRGB := DestBmp.ScanLine[i]; for j := 0 to SrcBmp.Width - 1 do begin if ValueChange > 0 then begin DestRGB.rgbtRed := Min(255, SrcRGB.rgbtRed + ValueChange; DestRGB.rgbtGreen := Min(255, SrcRGB.rgbtGreen + ValueChange; DestRGB.rgbtBlue := Min(255, SrcRGB.rgbtBlue + ValueChange; end else begin DestRGB.rgbtRed := Max(0, SrcRGB.rgbtRed + ValueChange; DestRGB.rgbtGreen := Max(0, SrcRGB.rgbtGreen + ValueChange; DestRGB.rgbtBlue := Max(0,SrcRGB.rgbtBlue + ValueChange; end; Inc(SrcRGB; Inc(DestRGB; end; end; end; //对比度调整 procedure ContrastChange(const SrcBmp,DestBmp:TBitmap;ValueChange:integer; var i, j: integer; SrcRGB, DestRGB: pRGBTriple; begin for i := 0 to SrcBmp.Height - 1 do begin SrcRGB := SrcBmp.ScanLine[i]; DestRGB := DestBmp.ScanLine[i]; for j := 0 to SrcBmp.Width - 1 do begin if ValueChange>=0 then begin if SrcRGB.rgbtRed >= 128 then DestRGB.rgbtRed := Min(255, SrcRGB.rgbtRed + ValueChange else DestRGB.rgbtRed := Max(0, SrcRGB.rgbtRed - ValueChange; if SrcRGB.rgbtGreen >= 128 then DestRGB.rgbtGreen := Min(255, SrcRGB.rgbtGreen + ValueChange else DestRGB.rgbtGreen := Max(0, SrcRGB.rgbtGreen - ValueChange; ifSrcRGB.rgbtBlue >= 128 then DestRGB.rgbtBlue := Min(255, SrcRGB.rgbtBlue + ValueChange else DestRGB.rgbtBlue := Max(0, SrcRGB.rgbtBlue - ValueChange; end else begin if SrcRGB.rgbtRed >= 128 then DestRGB.rgbtRed := Max(128,SrcRGB.rgbtRed + ValueChange else DestRGB.rgbtRed := Min(128, SrcRGB.rgbtRed - ValueChange; if SrcRGB.rgbtGreen >= 128 then DestRGB.rgbtGreen := Max(128, SrcRGB.rgbtGreen + ValueChange else DestRGB.rgbtGreen := Min(128,SrcRGB.rgbtGreen - ValueChange; if SrcRGB.rgbtBlue >= 128 thenDestRGB.rgbtBlue := Max(128, SrcRGB.rgbtBlue + ValueChange elseDestRGB.rgbtBlue := Min(128, SrcRGB.rgbtBlue - ValueChange; end; Inc(SrcRGB; Inc(DestRGB; end; end; end; //饱和度调整 procedure SaturationChange(const SrcBmp,DestBmp:TBitmap;ValueChange:integer; var Grays: array[0..767] of Integer; Alpha: array[0..255] of Word; Gray, x, y: Integer; SrcRGB,DestRGB: pRGBTriple; i: Byte; begin ValueChange:=ValueChange+255; for i := 0 to 255 do Alpha[i] := (i * ValueChange Shr 8; x := 0; for i := 0 to 255 do begin Gray := i - Alpha[i]; Grays[x] := Gray; Inc(x; Grays[x] := Gray; Inc(x; Grays[x] := Gray; Inc(x; end; for y := 0 to SrcBmp.Height - 1 do begin SrcRGB := SrcBmp.ScanLine[Y]; DestRGB := DestBmp.ScanLine[Y]; for x := 0 to SrcBmp.Width - 1 do begin Gray :=Grays[SrcRGB.rgbtRed + SrcRGB.rgbtGreen + SrcRGB.rgbtBlue]; if Gray +Alpha[SrcRGB.rgbtRed]>0 then DestRGB.rgbtRed := Min(255,Gray +Alpha[SrcRGB.rgbtRed] else DestRGB.rgbtRed := 0; if Gray +Alpha[SrcRGB.rgbtGreen]>0 then DestRGB.rgbtGreen := Min(255,Gray +Alpha[SrcRGB.rgbtGreen] else DestRGB.rgbtGreen := 0; if Gray +Alpha[SrcRGB.rgbtBlue]>0 then DestRGB.rgbtBlue := Min(255,Gray +Alpha[SrcRGB.rgbtBlue] else DestRGB.rgbtBlue := 0; Inc(SrcRGB; Inc(DestRGB; end; end; end; //RGB调整 procedureRGBChange(SrcBmp,DestBmp:TBitmap;RedChange,GreenChange,BlueChange:integer; var SrcRGB, DestRGB: pRGBTriple; i,j:integer; begin for i := 0 to SrcBmp.Height- 1 dobegin SrcRGB := SrcBmp.ScanLine[i]; DestRGB :=DestBmp.ScanLine[i]; for j := 0 to SrcBmp.Width - 1 do begin if RedChange> 0 then DestRGB.rgbtRed:= Min(255, SrcRGB.rgbtRed + RedChange else DestRGB.rgbtRed := Max(0, SrcRGB.rgbtRed + RedChange; if GreenChange> 0 then DestRGB.rgbtGreen :=Min(255, SrcRGB.rgbtGreen + GreenChange else DestRGB.rgbtGreen := Max(0, SrcRGB.rgbtGreen + GreenChange; if BlueChange> 0 then DestRGB.rgbtBlue :=Min(255, SrcRGB.rgbtBlue + BlueChange else DestRGB.rgbtBlue := Max(0, SrcRGB.rgbtBlue + BlueChange; Inc(SrcRGB; Inc(DestRGB; end; end; end; [颜色调整] //RGB<=>BGR procedure RGB2BGR(const Bitmap:TBitmap; var X: Integer; Y: Integer; PRGB: pRGBTriple; Color: Byte; begin for Y := 0 to (Bitmap.Height - 1 do begin forX := 0 to (Bitmap.Width - 1 do begin Color := PRGB^.rgbtRed; PRGB^.rgbtRed := PRGB^.rgbtBlue; PRGB^.rgbtBlue := Color; Inc(PRGB; end; end end; end; //灰度化(加权 procedure Grayscale(const Bitmap:TBitmap; var X: Integer; Y: Integer; PRGB: pRGBTriple; Gray: Byte; begin for Y := 0 to (Bitmap.Height - 1 do begin PRGB := Bitmap.ScanLine[Y]; for X := 0 to (Bitmap.Width - 1 do begin Gray := (77 * Red + 151 * Green + 28 * Blue shr 8; PRGB^.rgbtRed:=Gray; PRGB^.rgbtGreen:=Gray;PRGB^.rgbtBlue:=Gray; Inc(PRGB; end; end; end; 绘图区－即窗口显示图像的区域，亦可为全屏幕（在全屏幕下绘图的效果比一般窗口下好）中心点－即要绘图区显示的中心点在原始图像的坐标（声明：这个概念特别重要）先说说图像的放大，要放大一张图片，我们一般的做法是直接放大图像，但本文介绍的方法仅放大我们能够看到的部分，放大分两种情况，一种是放大后比绘图区还要小，这种情况没什么好说，当然是显示全部的图像；第二种是放大后的图像比绘图区大，这才是我们今天要讨论的重点话题，这种情况下我们先要确定图像放大后的大小，然后根据“中心点”计算在原始图像的位置和大小，最后把截取的图像放大到绘图区。
Delphi提供了数据访问（DataAccess）和数据控制（DataControls）的可视化控件，能够方便快捷地产生具有良好界面且功能强大的数据库应用程序。
对于涉及图像数据（含Graphic字段）的数据库应用程序，如人事管理信息系统等，图像数据的存取技术是一个关键。
然而，有关Delphi下图象的存取，特别是图像的保存方面的技术各种资料上很少提及。
下面，笔者结合一个简单的例子来说明。
一、图像数据的保存1．创建一个含有Graphic字段的数据库列表。
在WindowsISQ（或Databasedesktop）下createdatabasemydb．gdbcreatetablemyfrieds （namevarchar（15）notnull，telephonevarchar（12），addressvarchar（30），zipvarchar（8），picturevarchar（15），imageblob）；其中，picture字段用于保存图像的名称（包括路径），image（Graphic字符）则用于存储图像，其数据类型为“blob”。
2．建立窗体（如图1所示），设置窗体中各控件的属性。
该窗体的主要功能是将某人信息进行编辑和保存。
需要注意的图像保存所用的图像框必须用TImage而不能用TDBIm age，编辑框宜用Tedit而不宜用TDBEdit，这一点与图像的读取恰好相反。
其中，各主要控件的属性设置如下：Datasource1．Dataset：=table1；Table1．Databasename：=mydb．gdb；Table1．Tablename：=myfriends；Table1．active：=true；其他诸如Caption之类的属性设置不再叙述。
3．数据处理程序的建立。
（1）图像（．bmp文件）打开的处理。
procedureTForm1．pictopenbtnClick（Sender：TObject）；beginopendialog1．execute；image1．picture．loadfromfile（opendialog1．filename）；end；（2）图像保存的处理。
Delphi图像处理之图像⼆值化-----------开发环境D7---效果图-------只提供参考----------------unit开始1unit Unit1;23interface45uses6 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,7 Dialogs, ExtCtrls, StdCtrls, ExtDlgs;89type10 ThresholdValueArray=array of array of Byte ;11 TForm1 = class(TForm)12 Button1: TButton;13 Button2: TButton;14 Image1: TImage;15 Image2: TImage;16 OpenPictureDialog1: TOpenPictureDialog;17 Label1: TLabel;18 Button4: TButton;19 Label2: TLabel;20 EditX: TEdit;21 EditY: TEdit;22 Label3: TLabel;23 Label4: TLabel;24 Label5: TLabel;25 Label6: TLabel;26 Label7: TLabel;27procedure Button1Click(Sender: TObject);28procedure Button2Click(Sender: TObject);29procedure Button4Click(Sender: TObject);30procedure EditXChange(Sender: TObject);31private32function GetThresholdValue(sBmp: TBitmap; sX,sY: Byte): ThresholdValueArray;33function GetThresholdArrayGray(const sArray:ThresholdValueArray; sStartX, sEndX, sStartY, sEndY: word): Byte; 34{ Private declarations }35public36{ Public declarations }37end;3839var40 Form1: TForm1;4142implementation4344{$R *.dfm}4546procedure TForm1.Button1Click(Sender: TObject);47begin48if OpenPictureDialog1.Execute then49begin50 Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);51 Label1.Caption:='图⽚宽x⾼:'+inttostr(Image1.Picture.Width)+'x'+inttostr(Image1.Picture.Height);52end;53end;5455procedure TForm1.Button2Click(Sender: TObject);56const57 vThresholdValue:Byte=128;58var59 vP:PByteArray;60 x,y:Integer;61 vBmp:TBitmap;62 vGray:Integer;63begin64if Image1.Picture.Graphic =nil then65begin66 ShowMessage('没有图⽚！');67 Exit;68end;69 vBmp:=TBitmap.Create;70 vBmp.Assign(Image1.Picture.Bitmap);71 vBmp.PixelFormat:=pf24bit;72for y:=0to vBmp.Height-1do73begin74 vP:=vBmp.ScanLine[y];75for x:=0to vBmp.Width-1do76begin77 vGray:=(77*vP[3*x+2] + 149*vP[3*x+1] + 29*vP[3*x]) shr8;78if vGray>vThresholdValue then79begin80 vP[3*x+2]:=255;81 vP[3*x+1]:=255;82 vP[3*x]:=255;83end84else85begin86 vP[3*x+2]:=0;87 vP[3*x+1]:=0;88 vP[3*x]:=0;89end;90end;91end;92 Image2.Picture.Assign(vBmp);93 vBmp.Free;94end;9596function TForm1.GetThresholdArrayGray(const sArray: ThresholdValueArray; sStartX,97 sEndX, sStartY, sEndY: word): Byte;98var99 vGraySum:DWORD;100 i,j:Word;101begin102 Result:=128;//默认返回128103if sArray=nil then104 Exit;105 vGraySum:=0;106for i:=sStartX-1to sEndX-1do107begin108for j:=sStartY-1to sEndY-1do109begin110 vGraySum:=vGraySum+sArray[i,j];111end;112end;113 Result:=Round(vGraySum/((sEndX-sStartX+1)*(sEndY-sStartY+1)));114end;115116function TForm1.GetThresholdValue(sBmp: TBitmap; sX,117 sY: Byte): ThresholdValueArray;118119var120 i,j,x,y,vGray:Word;121 vLengthX,vLengthY,vModX,vModY:Word;122 vP:PByteArray;123 vBitmapGrayArray:ThresholdValueArray;124 vResultGrayArray:ThresholdValueArray;125begin126 Result:=nil;127if sBmp=nil then128 Exit;129if sX=0then130 sX:=1;131if sY=0then132 sY:=1;133 setlength(vBitmapGrayArray,sBmp.Width);134for i:=0to sBmp.Width-1do135begin136 setlength(vBitmapGrayArray[i],sBmp.Height);137end;138 SetLength(vResultGrayArray,sX);139for i:=0to sX-1do140begin141 SetLength(vResultGrayArray[i],sY);142end;143144for y:=0to sBmp.Height-1do145begin146 vP:=sBmp.ScanLine[y];147for x:=0to sBmp.Width-1do148begin149 vGray:=(77*vP[3*x+2] + 149*vP[3*x+1] + 29*vP[3*x]) shr8;150 vBitmapGrayArray[x,y]:=vGray;151end;152end;153 vLengthX:=sBmp.width div sX;154 vLengthY:=sBmp.Height div sY;155 vModX:=sBmp.width mod sX;156 vMody:=sBmp.Height mod sY;157for i:=0to sX-1do//⼩块158begin159for j:=0to sY-1do//⼩块160begin161if i<>sX-1then162begin163 vResultGrayArray[i,j]:=GetThresholdArrayGray(vBitmapGrayArray,vLengthX*i+1,vLengthX*i+vLengthX,vLengthY*j+1,vLengthY*j+vLengthY);164end165else//最后⼀列166begin167 vResultGrayArray[i,j]:=GetThresholdArrayGray(vBitmapGrayArray,vLengthX*i+1,vLengthX*i+vLengthX+vModX,vLengthY*j+1,vLengthY*j+vLengthY+vModY); 168end;169173 Result:=vResultGrayArray;174//数组释放175for i:=0to sBmp.Width-1do176begin177 setlength(vBitmapGrayArray[i],0);178end;179 setlength(vBitmapGrayArray,0);180end;181182procedure TForm1.Button4Click(Sender: TObject);183var184 vP:PByteArray;185 x,y:Integer;186 vBmp:TBitmap;187 vGray:Integer;188 vLengthX, vLengthY, vModX, vModY,vRowMod,vColMod: Word;189 vX,vY:Byte;190 vGrayArray:ThresholdValueArray;191 vRow,vCol:byte;192begin193if Image1.Picture.Graphic =nil then194begin195 ShowMessage('没有图⽚！');196 Exit;197end;198 vX:=StrToIntDef(editX.Text ,3);199 vY:=StrToIntDef(editY.Text ,3);200201//暂时最多分成255*255块202if (vX<1) or (vX>255) or (vY<1) or (vY>255) then203begin204 MessageBox(Handle,PChar('X和Y的范围：1到255; 请输⼊在这个范围内的数字！'),PChar(Application.Title),MB_ICONEXCLAMATION); 205 Exit;206end;207 Label6.Caption:='总块数:'+inttostr(vX*vY);208 vBmp:=TBitmap.Create;209 vBmp.Assign(Image1.Picture.Bitmap);210 vBmp.PixelFormat:=pf24bit;211212 vGrayArray:=GetThresholdValue(vBmp,vX,vY);213for y:=0to vBmp.Height-1do214begin215 vP:=vBmp.ScanLine[y];216 vRow:=y div vLengthY;217 vRowMod:=y div vLengthY;218if vRow<vY then219begin220if vRowMod>0then221 vRow:=vRow+1;222end;223for x:=0to vBmp.Width-1do224begin225 vCol:=x div vLengthx;226 vColMod:=x div vLengthx;227if vCol<vX then228begin229if vColMod>0then230 vCol:=vCol+1;231end;232 vGray:=(77*vP[3*x+2] + 149*vP[3*x+1] + 29*vP[3*x]) shr8;233if vGray>vGrayArray[vCol,vRow] then234begin235 vP[3*x+2]:=255;236 vP[3*x+1]:=255;237 vP[3*x]:=255;238end239else240begin241 vP[3*x+2]:=0;242 vP[3*x+1]:=0;243 vP[3*x]:=0;244end;245end;246end;247 Image2.Picture.Assign(vBmp);248 vBmp.Free;249end;250251procedure TForm1.EditXChange(Sender: TObject);252begin253 Label6.Caption:='总块数：'+inttostr(StrToIntDef(EditX.Text ,0)*strtointDef(EditY.Text,0));--------unit结束--------Form开始1object Form1: TForm12 Left = 5133 Top = 3264 Width = 9105 Height = 5286 Caption = 'Form1'7 Color = clBtnFace8 Font.Charset = DEFAULT_CHARSET9 Font.Color = clWindowText10 Font.Height = -1111 = 'MS Sans Serif'12 Font.Style = []13 OldCreateOrder = False14 PixelsPerInch = 9615 TextHeight = 1316object Image1: TImage17 Left = 818 Top = 1619 Width = 42520 Height = 33721 Center = True22 Proportional = True23 Stretch = True24end25object Image2: TImage26 Left = 44827 Top = 1628 Width = 42529 Height = 33730 Center = True31 Proportional = True32 Stretch = True33end34object Label1: TLabel35 Left = 1636 Top = 36037 Width = 38538 Height = 2539 AutoSize = False40 Caption = '图⽚宽x⾼:'41end42object Label2: TLabel43 Left = 52844 Top = 36045 Width = 27346 Height = 1347 Alignment = taCenter48 AutoSize = False49 Caption = '按块求出阈值'50end51object Label3: TLabel52 Left = 45753 Top = 38154 Width = 7355 Height = 1356 Caption = '输⼊X x Y块：'57end58object Label4: TLabel59 Left = 53360 Top = 38161 Width = 2462 Height = 1363 Alignment = taRightJustify64 AutoSize = False65 Caption = 'X:'66end67object Label5: TLabel68 Left = 62069 Top = 38070 Width = 2171 Height = 1772 Alignment = taRightJustify73 AutoSize = False74 Caption = 'Y:'75end76object Label6: TLabel77 Left = 70478 Top = 38379 Width = 18580 Height = 1381 AutoSize = False82 Caption = '总块数：'83end84object Label7: TLabel85 Left = 51286 Top = 44087 Width = 37788 Height = 4589 AutoSize = False90 Caption = '理应是块数分的越多，越准确！本⼈这个呈抛物线的感觉，'#13#10'有⼀个最优的块数，算了先不找原因了，抛砖引⽟，哈哈哈'91 WordWrap = True92end93object Button1: TButton94 Left = 1695 Top = 41696 Width = 16197 Height = 2598 Caption = 'Button1_加载图⽚'99 TabOrder = 0100 OnClick = Button1Click101end102object Button2: TButton103 Left = 232104 Top = 416105 Width = 177106 Height = 25107 Caption = 'Button2_⼆值化_默认阈值'108 TabOrder = 1109 OnClick = Button2Click110end111object Button4: TButton112 Left = 560113 Top = 407114 Width = 297115 Height = 25116 Caption = 'Button4_分块求平均阈值，按块⼆值化'117 TabOrder = 2118 OnClick = Button4Click119end120object EditX: TEdit121 Left = 567122 Top = 378123 Width = 49124 Height = 21125 ImeName = '中⽂(简体) - 搜狗拼⾳输⼊法'126 TabOrder = 3127 Text = 'EditX'128 OnChange = EditXChange129end130object EditY: TEdit131 Left = 649132 Top = 379133 Width = 47134 Height = 21135 ImeName = '中⽂(简体) - 搜狗拼⾳输⼊法'136 TabOrder = 4137 Text = 'EditY'138 OnChange = EditXChange139end140object OpenPictureDialog1: TOpenPictureDialog141 Filter = 'Bitmaps (*.bmp)|*.bmp'142 Left = 72143 Top = 368144end145end------------Form结束。
delphi sqlite3_columnblob 的用法Delphi 中的 SQLite3_ColumnBlob 函数用于获取指定行列的数据，并以 BLOB 类型返回。
函数定义如下：function sqlite3_columnblob(stmt: Psqlite3_stmt;iCol: Integer): Pointer;参数说明：- stmt: 指向已经执行的 SQL 语句的 sqlite3_stmt 对象的指针。
- iCol: 要获取数据的列索引。
索引从0开始计数。
返回值是一个指向 BLOB 数据的指针，或者如果列包含NULL 值，则返回 nil。
以下是一个示例代码，演示了如何使用 SQLite3_ColumnBlob 函数来获取 BLOB 数据：```delphivarstmt: Psqlite3_stmt;blobData: Pointer;blobLen: Integer;begin// Prepare the SQL statementsqlite3_prepare_v2(DatabaseHandle, 'SELECT blob_column FROM my_table', -1, @stmt, nil);// Step through the result set and fetch the blob datawhile sqlite3_step(stmt) = SQLITE_ROW dobegin// Get the blob data and its length using SQLite3_ColumnBlob and SQLite3_ColumnBytes functionsblobData := sqlite3_columnblob(stmt, 0);blobLen := sqlite3_columnbytes(stmt, 0);// Process the blob data// ...// Release the blob memory if necessarysqlite3_free(blobData);end;// Finalize the statementsqlite3_finalize(stmt);end;```注意：完成对 BLOB 数据的处理后，如果内存不再使用，需要调用 sqlite3_free 函数手动释放 BLOB 内存空间。
delphi createbolbstream 用法Delphi CreateBlobStream 用法1. CreateBlobStream 方法概述•TDataSet类中的CreateBlobStream方法可用于创建一个用于读取、写入、编辑和保存二进制大对象（BLOB）字段的流。
2. CreateBlobStream 方法参数•Field：指定要处理的字段对象。
•Mode：指定流的访问模式，可使用bmRead（只读）、bmWrite （只写）、bmReadWrite（读写）和bmAppend（追加）等模式。
3. 使用 CreateBlobStream 读取 BLOB 字段procedure ReadBlobField(Field: TBlobField);varStream: TStream;Buffer: TBytes;beginStream := (Field, bmRead);trySetLength(Buffer, );(Buffer[0], );// 使用 Buffer 对象处理 BLOB 数据// ...finally;end;end;代码解释：•首先，通过CreateBlobStream方法创建一个只读的流对象，并传入要处理的Field和bmRead模式。
•然后，利用 `获取 BLOB 字段的大小，并根据其大小设置Buffer` 的长度。
•使用 `将 BLOB 数据读取到Buffer` 中，从而可以对其进行处理。
4. 使用 CreateBlobStream 写入 BLOB 字段procedure WriteBlobField(Field: TBlobField; const B uffer: TBytes);varStream: TStream;beginStream := (Field, bmReadWrite);try(Buffer[0], Length(Buffer));finally;end;end;代码解释：•类似于读取 BLOB 字段的示例，这次使用CreateBlobStream 方法创建一个读写的流对象，并传入要处理的Field和bmReadWrite模式。
Delphi的图形处理（一）Delphi的图形处理之一 -- 图像处理在可视化编程中的作用及其应用价值 作者:何咏发布日期:(2005-4-12 21:07:49)声明：本文著作权属于何咏,如要转载请声明作者及出处。
第一章图像处理在可视化编程中的作用及其应用价值图像处理，是可视化编程的基础内容。
在Windows操作系统中，一切要输出到屏幕上的东西都是通过图形处理这部分的内容来实现的。
比如一个程序使用了标签控件，它看起来似乎并没有用到什么图形处理，但实际上标签控件就是通过使用GDI库中的图形处理函数来实现的。
可见图形处理在编程中的重要性。
图像处理在实际的应用中也极具价值。
平面制作、动画制作等都离不开它。
这一部分的内容十分繁多。
我本次研究的内容，只是其中最基础的、最重要一部分。
探究Delphi的图形处理之二 -- 基本图像处理函数 作者:何咏发布日期:(2005-4-12 21:06:29)声明：本文著作权属于何咏,如要转载请声明作者及出处。
第二章图像处理函数2.1 为什么选择Delphi所有的可视化编程语言都能够进行图像处理。
但由于这些语言的定位不同，它们在进行图形处理的效率和便捷程度上也各不相同。
实际上，Visual C 的图像处理效率是最高的，这是由于GDI类库本身就是用C++写的。
但是使用VC来编程并不是一件方便的事，因为这个语言本身就较为繁杂难懂，所以我没有选择它。
Visual Basic（VB）也是一个常用的语言，但它在图形处理方面能力较差。
首先是它的坐标系统是以t wip为单位的浮点坐标系统，在调用GDI类库时，必须对坐标系统进行转换，浪费了大量的资源，编程起来较为麻烦。
在多方面因素的影响下，我觉得Delphi是一个理想的语言。
Delphi已经把绝大多数GDI绘图函数都封装成可直接调用的类，使用它进行图形处理操作十分方便，而且Delphi 是Pascal演变而来的，Pascal具有严谨易读的特点，因此很容易上手。
Delphi7.0对图像数据处理的研究与实现
王蕾;陆玲
【期刊名称】《计算机与现代化》
【年(卷),期】2004(000)007
【摘要】介绍了用Delphi 7.0实现对数据库图像数据进行处理的两种不同方法,通过比较这两种方法得出它们各自的适用条件.
【总页数】3页(P70-72)
【作者】王蕾;陆玲
【作者单位】东华理工学院计算机与通信系,江西,抚州,344000;东华理工学院计算机与通信系,江西,抚州,344000
【正文语种】中文
【中图分类】TP391
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