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分享求：C# 将bmp转成灰度图（8位，256色），然后再转成单色图（1位，只有黑白两色）的算法
求：C#中 将bmp格式的图片转成灰度图（8位，256色），然后再转成单色图（1位，只有黑白两色）的算法，不要把网上找来的贴上来，最好是自己编码实现过。
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deyter 2009-04-16
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mark
Harvey_He 2009-04-16
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灰度图象就是单色图象,首先楼主的理解有误， 我想楼主第二步想要的是 黑白二值图（1 位，要么是0，要么是1）
//灰度图
//二值图
//灰度图
Color c = new Color();
Color cc = new Color();
Bitmap box1 = new Bitmap(pictureBox1.Image);
Bitmap box2 = new Bitmap(pictureBox1.Image);
int rr,gg,bb;
for (int i = 0; i < pictureBox1.Image.Width; i++)
{
for (int j = 0; j < pictureBox1.Image.Height; j++)
{
c = box1.GetPixel(i, j);
rr = c.R;
gg = c.G;
bb = c.B;
cc = Color.FromArgb(rr, rr, rr);
box2.SetPixel(i, j, cc);
}
}
pictureBox2.Refresh();
pictureBox2.Image = box2;
//二值图
Color c = new Color();
Color cc = new Color();
Bitmap box1 = new Bitmap(pictureBox1.Image);
Bitmap box2 = new Bitmap(pictureBox1.Image);
int rr；
for (int i = 0; i < pictureBox1.Image.Width; i++)
{
for (int j = 0; j < pictureBox1.Image.Height; j++)
{
c = box1.GetPixel(i, j);
rr = c.R;
if(rr >=128)
{
rr = 255;
}
else
{
rr = 0;
}
cc = Color.FromArgb(rr, rr, rr);
box2.SetPixel(i, j, cc);
}
}
pictureBox2.Refresh();
pictureBox2.Image = box2;
hardstone1 2009-04-16
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还是使用opencv最方便阿
winbq5 2009-04-04
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up
bomdy 2009-03-03
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这是我原来写的一个调整位图的类，你试试合不合用
Bitmap bmp = new Bitmap("test.bmp");
BmpAdjuster.Monochrome(ref bmp);
Bitmap bmp = new Bitmap("test.bmp");
BmpAdjuster.Monochrome(ref bmp);
class BmpAdjuster
{
public delegate ColorPalette PaletteAdjustEvent(ColorPalette plt);
public unsafe delegate void ConvertScanLineEvent(IntPtr srcLine, IntPtr dstLine, int width, int srcPixBit, int dstPixBit, Bitmap srcBmp, Bitmap dstBmp);
public static void AdjustColor(ref Bitmap bmp, PixelFormat format, PaletteAdjustEvent PalleteAdjust, ConvertScanLineEvent ConvertScanLine)
{
Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
Bitmap bmpOut = new Bitmap(bmp.Width, bmp.Height, format);
bmpOut.Palette = PalleteAdjust(bmpOut.Palette);
PixelFormat srcFmt = bmp.PixelFormat;
PixelFormat dstFmt = bmpOut.PixelFormat;
int srcPixBit = GetPixelSize(srcFmt);
int dstPixBit = GetPixelSize(dstFmt);
BitmapData srcData = null;
BitmapData dstData = null;
try
{
srcData = bmp.LockBits(rect, ImageLockMode.ReadOnly, srcFmt);
dstData = bmpOut.LockBits(rect, ImageLockMode.WriteOnly, dstFmt);
unsafe
{
byte* srcLine = (byte*)srcData.Scan0.ToPointer();
byte* dstLine = (byte*)dstData.Scan0.ToPointer();
for (int L = 0; L < srcData.Height; L++)
{
ConvertScanLine((IntPtr)srcLine, (IntPtr)dstLine, srcData.Width, srcPixBit, dstPixBit, bmp, bmpOut);
srcLine += srcData.Stride;
dstLine += dstData.Stride;
}
}
}
finally
{
bmp.UnlockBits(srcData);
bmpOut.UnlockBits(dstData);
}
bmp = bmpOut;
}
internal static int GetPixelSize(PixelFormat format)
{
switch (format)
{
case PixelFormat.Format16bppRgb555: return 16;
case PixelFormat.Format16bppRgb565: return 16;
case PixelFormat.Format24bppRgb: return 24;
case PixelFormat.Format32bppRgb: return 32;
case PixelFormat.Format1bppIndexed: return 1;
case PixelFormat.Format4bppIndexed: return 4;
case PixelFormat.Format8bppIndexed: return 8;
case PixelFormat.Format16bppArgb1555: return 16;
case PixelFormat.Format32bppPArgb: return 32;
case PixelFormat.Format16bppGrayScale: return 16;
case PixelFormat.Format48bppRgb: return 48;
case PixelFormat.Format64bppPArgb: return 64;
case PixelFormat.Canonical: return 32;
case PixelFormat.Format32bppArgb: return 32;
case PixelFormat.Format64bppArgb: return 64;
}
return 0;
}
public unsafe static void Monochrome(ref Bitmap bmp)
{
AdjustColor(ref bmp, PixelFormat.Format1bppIndexed,
new PaletteAdjustEvent(SetBlackWhitePallete),
new ConvertScanLineEvent(ConvertBlackWhiteScanLine));
}
static ColorPalette SetBlackWhitePallete(ColorPalette plt)
{
plt.Entries[0] = Color.Black;
plt.Entries[1] = Color.White;
return plt;
}
unsafe static void ConvertBlackWhiteScanLine(IntPtr srcLine, IntPtr dstLine, int width, int srcPixBit, int dstPixBit, Bitmap srcBmp, Bitmap dstBmp)
{
byte* src = (byte*)srcLine.ToPointer();
byte* dst = (byte*)dstLine.ToPointer();
int srcPixByte = srcPixBit / 8;
int x, v, t = 0;
for (x = 0; x < width; x++)
{
v = 28 * src[0] + 151 * src[1] + 77 * src[2];
t = (t << 1) | (v > 200*256 ? 1 : 0);
src += srcPixByte;
if (x % 8 == 7)
{
*dst = (byte)t;
dst++;
t = 0;
}
}
if ((x %= 8) != 7)
{
t <<= 8-x;
*dst = (byte)t;
}
}
public static void Gray(ref Bitmap bmp)
{
AdjustColor(ref bmp, PixelFormat.Format8bppIndexed,
new PaletteAdjustEvent(SetGrayPallete),
new ConvertScanLineEvent(ConvertGaryScanLine));
}
static ColorPalette SetGrayPallete(ColorPalette plt)
{
for (int i = plt.Entries.Length - 1; i >= 0; i--)
plt.Entries[i] = Color.FromArgb(i, i, i);
return plt;
}
unsafe static void ConvertGaryScanLine(IntPtr srcLine, IntPtr dstLine, int width, int srcPixBit, int dstPixBit, Bitmap srcBmp, Bitmap dstBmp)
{
byte* src = (byte*)srcLine.ToPointer();
byte* dst = (byte*)dstLine.ToPointer();
int srcPixByte = srcPixBit / 8;
for (int x = 0; x < width; x++)
{
*dst = (byte)((28 * src[0] + 151 * src[1] + 77 * src[2]) >> 8);
src += srcPixByte;
dst++;
}
}
}
wenbin 2009-03-03
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AForge找这个开源工程，里面你想要都有。
宝_爸 2009-03-03
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没实现过。。。
hbmy9107lwt 2009-03-03
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up
derek02 2009-03-03
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up..
