LEADTOOLS(Leadtoolsアセンブリ)

フレームを表示

ChangeViewPerspectiveメソッド








目的のビューの視点と方向。
任意のビューと視点を得るために必要な画像データを上下左右に反転します。
構文
public void ChangeViewPerspective( 
   RasterViewPerspective viewPerspective
)
'Declaration
 
Public Sub ChangeViewPerspective( _
   ByVal viewPerspective As RasterViewPerspective _
) 
'Usage
 
Dim instance As RasterImage
Dim viewPerspective As RasterViewPerspective
 
instance.ChangeViewPerspective(viewPerspective)
public void ChangeViewPerspective( 
   RasterViewPerspective viewPerspective
)
- (BOOL)changeViewPerspective:(LTRasterViewPerspective)viewPerspective error:(NSError **)error
public void changeViewPerspective(RasterViewPerspective viewPerspective)
 function Leadtools.RasterImage.ChangeViewPerspective( 
   viewPerspective 
)
public:
void ChangeViewPerspective( 
   RasterViewPerspective viewPerspective
) 

パラメーター

viewPerspective
目的のビューの視点と方向。
解説

ViewPerspectiveは、imageのピクセルの配置です。このメソッド参照imageは調和します。そして、それはimageのディスプレイ座標とはしばしば異なります。

image座標を含む計算を単純化するためにデータとViewPerspectiveを変更するために、このメソッドを使います。このメソッドは、画像表示に影響を及ぼしません。詳細については、「ビューの視点と方向について」を参照してください。

viewPerspectiveのための以下の値は、中で(ドキュメント/Medicalのみ)だけサポートされます:

サンプル

このサンプルは、1-ビット圧縮画像データにアクセスするために、低レベルのメソッドを説明します。行を取得して配置する機能、およびバッファー間の処理において行を処理する機能を示します。この関数の結果、最初の50行が反転されます。

Copy Code  
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg

      
Public Sub GetRowCompressedExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   ' Load the bitmap, at 1 bit per pixel, compressed
   codecs.Options.Load.Compressed = True
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "OCR1.TIF"), 1, CodecsLoadByteOrder.Bgr, 1, 1)
   ' This example does not work with rotated view perspectives.
   If (image.ViewPerspective <> RasterViewPerspective.TopLeft) OrElse (image.ViewPerspective <> RasterViewPerspective.BottomLeft) Then
      image.ChangeViewPerspective(RasterViewPerspective.TopLeft)
   End If

   ' Adjust the YOffset if the view perspective is bottom left.
   Dim nRow As Integer = 500 ' first row to get.
   Dim nYSize As Integer = 500 ' number of rows to get.

   If image.ViewPerspective = RasterViewPerspective.BottomLeft Then
      nRow = image.Height - nRow - nYSize
   End If

   ' Allocate the buffers.
   Dim pBuffer As Byte() = New Byte(Convert.ToInt32((((image.Width + 31) And Not (31)) / 8)) * nYSize - 1) {} ' Buffer to hold the expanded row.
   Dim pRunBuffer As System.UInt16() = New System.UInt16(((image.Width + 3) * 2) * nYSize - 1) {} ' Buffer to hold the compressed row.

   If image.IsGlobalMemory Then
      image.Access()
   End If
   ' Get the top nRow lines.
   image.GetRowCompressed(Nothing, pRunBuffer, 0, nRow, nYSize)
   ' Expand the compressed data.
   RasterRleCompressor.ExpandRows(pRunBuffer, pBuffer, 0, image.Width, nYSize)
   ' Invert the data.

   Dim n As Integer = 0
   Do While n < (image.BytesPerLine * nYSize)
      pBuffer(n) = pBuffer(n) Xor Convert.ToByte(&HFF)
      n += 1
   Loop


   ' Compress the inverted data.
   RasterRleCompressor.CompressRows(pRunBuffer, pBuffer, 0, image.Width, nYSize)

   ' Put the inverted, compressed data back into the image.
   image.SetRowCompressed(Nothing, pRunBuffer, 0, nRow, nYSize)

   If image.IsGlobalMemory Then
      image.Release()
   End If

   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_getrowcompresed.BMP"), RasterImageFormat.Bmp, 0)

   image.Dispose()
   codecs.Dispose()
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using Leadtools.Svg;

      
public void GetRowCompressedExample()
{
   RasterCodecs codecs = new RasterCodecs();
   // Load the bitmap, at 1 bit per pixel, compressed
   codecs.Options.Load.Compressed = true;
   RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "OCR1.TIF"), 1, Leadtools.Codecs.CodecsLoadByteOrder.Bgr, 1, 1);
   // This example does not work with rotated view perspectives.
   if((image.ViewPerspective != RasterViewPerspective.TopLeft) || (image.ViewPerspective != RasterViewPerspective.BottomLeft))
      image.ChangeViewPerspective(RasterViewPerspective.TopLeft);

   // Adjust the YOffset if the view perspective is bottom left.
   int nRow = 500; // first row to get.
   int nYSize = 500; // number of rows to get.

   if(image.ViewPerspective == RasterViewPerspective.BottomLeft)
      nRow = image.Height - nRow - nYSize;

   // Allocate the buffers.
   byte[] pBuffer = new byte[Convert.ToInt32((((image.Width + 31) & ~(31)) / 8)) * nYSize]; // Buffer to hold the expanded row.
   ushort[] pRunBuffer = new ushort[((image.Width + 3) * 2) * nYSize]; // Buffer to hold the compressed row.

   if(image.IsGlobalMemory)
      image.Access();
   // Get the top nRow lines.
   image.GetRowCompressed(null, pRunBuffer, 0, nRow, nYSize);
   // Expand the compressed data.
   RasterRleCompressor.ExpandRows(pRunBuffer, pBuffer, 0, image.Width, nYSize);
   // Invert the data.

   for(int n = 0; n < (image.BytesPerLine * nYSize); n++)
      pBuffer[n] ^= 0xff;


   // Compress the inverted data.
   RasterRleCompressor.CompressRows(pRunBuffer, pBuffer, 0, image.Width, nYSize);

   // Put the inverted, compressed data back into the image.
   image.SetRowCompressed(null, pRunBuffer, 0, nRow, nYSize);

   if(image.IsGlobalMemory)
      image.Release();

   codecs.Save(image,Path.Combine(ImagesPath.Path,"IMAGE1_getrowcompresed.BMP"), RasterImageFormat.Bmp, 0);

   image.Dispose();
   codecs.Dispose();
}
必要条件

ターゲットプラットホーム

参照

参照

RasterImageクラス
RasterImageメンバ