Oilpaint油画滤镜
最后更新于:2022-04-01 06:46:22
Oilpaint油画滤镜
图像油画效果实际上是将图像边缘产生一种朦胧,雾化的效果,同时,将一定的边缘模糊化,这样图像整体上看去像素与像素之间就像雾一样随机呈现。
算法过程如下:
假设当前像素为P(x,y),他的随机位置为Pd(dx,dy),那么算法公式如下:
[![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-01-05_568b332562d53.png)](http://www.zealpixel.com/data/attachment/portal/201507/19/124640k94d1gpdecvpctte.png)
其中,K(v)为最大值不大于v的随机数正数,v为雾化阈值,v值越大,雾化程度越明显,反之,雾化程度越小,v=0时,图像无变化效果。
核心代码如下:
~~~
/// <summary>
/// Mosaic filter.
/// </summary>
/// <param name="src">Source image.</param>
/// <param name="blockSize">The size of mosaic effect.</param>
/// <returns>Resullt image.</returns>
public Bitmap OilpaintFilter(Bitmap src, int intensity)
{
Bitmap srcBitmap = new Bitmap(src);
int w = srcBitmap.Width;
int h = srcBitmap.Height;
System.Drawing.Imaging.BitmapData srcData = srcBitmap.LockBits(new Rectangle(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
IntPtr ptr = srcData.Scan0;
int bytes = h * srcData.Stride;
byte[] srcValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, srcValues, 0, bytes);
byte[] tempValues = (byte[])srcValues.Clone();
int stride = srcData.Stride;
Random ran = new Random();
int k = 0;
int dx = 0;
int dy = 0;
for (int j = 0; j < h; j++)
{
for (int i = 0; i < w; i++)
{
k = ran.Next(intensity);
dx = (i + k) >= w ? w - 1 : (i + k);
dy = (j + k) >= h ? h - 1 : (j + k);
tempValues[i * 4 + j * w * 4] = (byte)srcValues[dx * 4 + dy * w * 4];
tempValues[i * 4 + 1 + j * w * 4] = (byte)srcValues[dx * 4 + 1 + dy * w * 4];
tempValues[i * 4 + 2 + j * w * 4] = (byte)srcValues[dx * 4 + 2 + dy * w * 4];
}
}
srcValues = (byte[])tempValues.Clone();
System.Runtime.InteropServices.Marshal.Copy(srcValues, 0, ptr, bytes);
srcBitmap.UnlockBits(srcData);
return srcBitmap;
}
~~~
图像油画滤镜效果如下:
[![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-01-05_568b332571496.jpg)](http://www.zealpixel.com/data/attachment/portal/201507/19/124819mlyntu43nlt3rt38.jpg)
原图
[![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-01-05_568b33258b390.png)](http://www.zealpixel.com/data/attachment/portal/201507/19/124820l5tvmt2pggmzbvkb.png)
Oilpaint滤镜效果
最后,放上一个完整的C#版程序Demo下载链接:[http://www.zealpixel.com/forum.php?mod=viewthread&tid=52&extra=page%3D1](http://www.zealpixel.com/forum.php?mod=viewthread&tid=52&extra=page%3D1)