圖像平移變換函數
[算法說明]
圖像平移就是使圖像沿水平方向和垂直方向移動。
如果把座標原點(0,0)平移到點(x0,y0)處，則變換公式爲：
(x,y)爲原始圖像座標，(x', y')爲變換後的圖像座標。而圖像中的各個像素點移動了sqrt(x*x + y*y)距離。用矩陣表示爲2-(22)：
[函數代碼]
///
/// Translation process.
///
/// Source image.
/// Translate value of x.
/// Translate value of y.
///
public static WriteableBitmap TranslationProcess(WriteableBitmap src,int x,int y)////18 平移變換
{
if(src!=null )
{
int w = src.PixelWidth;
int h = src.PixelHeight;
WriteableBitmap translateImage = new WriteableBitmap(w, h);
byte[] temp = src.PixelBuffer.ToArray();
byte[] tempMask = new byte[w * h * 4];
for (int j = 0; j < h; j++)
{
for (int i = 0; i < w; i ++)
{
if (i + x < 0 || i + x >= w || j + y < 0 || j + y >= h)
{
tempMask[i * 4 + j * w * 4] = (byte)0;
tempMask[i * 4 + 1 + j * w * 4] = (byte)0;
tempMask[i * 4 + 2 + j * w * 4] = (byte)0;
}
else
{
tempMask[i * 4 + j * w * 4] = (byte)(temp[(i + x) * 4 + (j + y) * w * 4]);
tempMask[i * 4 + 1 + j * w * 4] = (byte)(temp[(i + x) * 4 + 1 + (j + y) * w * 4]);
tempMask[i * 4 + 2 + j * w * 4] = (byte)(temp[(i + x) * 4 + 2 + (j + y) * w * 4]);
tempMask[i * 4 + 3 + j * w * 4] = (byte)(temp[(i + x) * 4 + 3 + (j + y) * w * 4]);
}
}
}
Stream sTemp = translateImage.PixelBuffer.AsStream();
sTemp.Seek(0, SeekOrigin.Begin);
sTemp.Write(tempMask, 0, w * 4 * h);
return translateImage;
}
else
{
return null;
}
}
[圖像效果]
Fig.1原圖 Fig.2效果圖(x=-20,y=-20)
圖像水平鏡像函數
[算法說明]
圖像水平鏡像就是將圖像作如下矩陣變換:
[函數代碼]
///
/// Horizontal mirror process.
///
/// Source image.
///
public static WriteableBitmap MirrorXProcess(WriteableBitmap src)////19 水平鏡像
{
if(src!=null )
{
int w = src.PixelWidth;
int h = src.PixelHeight;
WriteableBitmap mirrorImage = new WriteableBitmap(w,h);
byte[] temp = src.PixelBuffer.ToArray();
byte[] tempMask = new byte[w * h * 4];
for (int j = 0; j < h; j++)
{
for (int i = 0; i < w; i++)
{
tempMask[i * 4 + j * w * 4] = temp[(w - 1 - i) * 4 + j * w * 4];
tempMask[i * 4 + 1 + j * w * 4] = temp[(w - 1 - i) * 4 + 1 + j * w * 4];
tempMask[i * 4 + 2 + j * w * 4] = temp[(w - 1 - i) * 4 + 2 + j * w * 4];
tempMask[i * 4 + 3 + j * w * 4] = temp[(w - 1 - i) * 4 + 3 + j * w * 4];
}
}
Stream sTemp = mirrorImage.PixelBuffer.AsStream();
sTemp.Seek(0, SeekOrigin.Begin);
sTemp.Write(tempMask, 0, w * 4 * h);
return mirrorImage;
}
else
{
return null;
}
}
[圖像效果]
Fig.1原圖 Fig.2效果圖
圖像垂直鏡像函數
[算法說明]
圖像垂直鏡像就是將圖像作如下矩陣變換:
[函數代碼]
///
/// Vertical mirror process.
///
/// Source image.
///
public static WriteableBitmap MirrorYProcess(WriteableBitmap src)////20 垂直鏡像
{
if(src!=null )
{
int w = src.PixelWidth;
int h = src.PixelHeight;
WriteableBitmap mirrorImage = new WriteableBitmap(w,h);
byte[] temp = src.PixelBuffer.ToArray();
byte[] tempMask = new byte[w * h * 4];
for (int i = 0; i < w; i++)
{
for (int j = 0; j < h; j++)
{
tempMask[i * 4 + j * w * 4] = temp[i * 4 + (h - 1 - j) * w * 4];
tempMask[i * 4 + 1 + j * w * 4] = temp[i * 4 + 1 + (h - 1 - j) * w * 4];
tempMask[i * 4 + 2 + j * w * 4] = temp[i * 4 + 2 + (h - 1 - j) * w * 4];
tempMask[i * 4 + 3 + j * w * 4] = temp[i * 4 + 3 + (h - 1 - j) * w * 4];
}
}
Stream sTemp = mirrorImage.PixelBuffer.AsStream();
sTemp.Seek(0, SeekOrigin.Begin);
sTemp.Write(tempMask, 0, w * 4 * h);
return mirrorImage;
}
else
{
return null;
}
}
[圖像效果]
Fig.1原圖 Fig.2效果圖
demo 下載： http://www.zealfilter.com/forum.php?mod=viewthread&tid=17&extra=page%3D2