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图像滤镜艺术---球面(Spherize)滤镜

2015-09-15 11:06 344 查看
球面(Spherize)滤镜

球面滤镜是通过极坐标变换实现图像的球面特效。

代码如下：

//

///
/// Pinch Filter

/// /// Source image.

/// The X position of sun.

/// The Y position of sun.

/// The result image.

private Bitmap SpherizeFilterProcess(Bitmap srcBitmap, int cenX, int cenY)

{

Bitmap a = new Bitmap(srcBitmap);

int w = a.Width;

int h = a.Height;

int radius = 0;

Bitmap dst = new Bitmap(w, h);

System.Drawing.Imaging.BitmapData srcData = a.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

System.Drawing.Imaging.BitmapData dstData = dst.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);

unsafe

{

byte* pIn = (byte*)srcData.Scan0.ToPointer();

byte* pOut = (byte*)dstData.Scan0.ToPointer();

byte* p = null;

int sWidth = srcData.Stride;

int stride = sWidth - w * 4;

int offsetX = 0, offsetY = 0;

int newX = 0, newY = 0;

double radian = 0;

for (int y = 0; y < h; y++)

{

for (int x = 0; x < w; x++)

{

offsetX = x - cenX;

offsetY = y - cenY;

radian = Math.Atan2(offsetY, offsetX);

radius = (int)((offsetX * offsetX + offsetY * offsetY) / Math.Max(cenX, cenY));

newX = (int)(radius * Math.Cos(radian)) + cenX;

newY = (int)(radius * Math.Sin(radian)) + cenY;

newX = Math.Min(w - 1, Math.Max(0, newX));

newY = Math.Min(h - 1, Math.Max(0, newY));

p = pIn + newY * srcData.Stride + newX * 4;

pOut[0] = (byte)p[0];

pOut[1] = (byte)p[1];

pOut[2] = (byte)p[2];

pOut[3] = (byte)255;

pOut += 4;

}

pOut += stride;

}

a.UnlockBits(srcData);

dst.UnlockBits(dstData);

}

return dst;

}

效果图如下：





原图





效果图(X=240,Y=240)

最后放上一个完整的C#板程序DEMO：http://www.zealpixel.com/forum.php?mod=viewthread&tid=56&extra=page%3D1
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