沧海一粟…… 通过本文主要向大家介绍了c#图像灰度化,c#彩色图像灰度化,c#图片灰度化,c#灰度图,c#灰度重心法等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com
本文实例讲述了C#图像灰度级拉伸的方法。分享给大家供大家参考。具体如下：
//定义图像灰度拉伸函数
private static Bitmap GrayLP (Bitmap a)
{
Rectangle rect = new Rectangle(0, 0, a.Width, a.Height);
System.Drawing.Imaging.BitmapData srcData = a.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, a.PixelFormat);
IntPtr ptr = srcData.Scan0;
int bytes = 0;
if (a.PixelFormat == System.Drawing.Imaging.PixelFormat.Format8bppIndexed)
{ bytes = a.Width * a.Height; }
else { bytes = a.Width * a.Height * 3; }
byte[] grayValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, grayValues, 0, bytes);
byte n = 255, m = 0;
double p;
//计算最大和最小灰度级
for (int i = 0; i < bytes; i++)
{
//计算最小灰度级
if (n > grayValues[i])
{
n = grayValues[i];
}
//计算最大灰度级
if (m < grayValues[i])
{
m = grayValues[i];
}
}
//得到斜率
p = 255.0 / (m - n);
//灰度拉伸
for (int i = 0; i < bytes; i++)
{
grayValues[i] = (byte)(p * (grayValues[i] - n) + 0.5);
}
System.Runtime.InteropServices.Marshal.Copy(grayValues, 0, ptr, bytes);
a.UnlockBits(srcData);
return a;
}
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希望本文所述对大家的C#程序设计有所帮助。
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