/* ----------------------------------------------------------文件名称：Gray.cs作者：秦建辉MSN：splashcn@msn.comQQ：36748897博客：http://blog.csdn.net/jhqin开发环境： Visual Studio V2010 .NET Framework 4 Client Profile版本历史： V1.0 2012年04月16日 图像灰度化------------------------------------------------------------ */using System;using System.Windows.Media;using System.Windows.Media.Imaging;namespace Splash.Imaging{ /// <summary> /// 图像处理：灰度化 /// </summary> public static class Gray { /// <summary> /// 将位图转换为彩色数组 /// </summary> /// <param name="bitmap">原始位图</param> /// <returns>彩色数组</returns> /// <remarks> /// 1.扩展方法 /// 2.忽视Alpha通道 /// </remarks> public static Color[,] ToColorArray(this BitmapSource bitmap) { // 将像素格式统一到Bgr32，并提取图像数据 Int32 PixelHeight = bitmap.PixelHeight; // 图像高度 Int32 PixelWidth = bitmap.PixelWidth; // 图像宽度 Int32 Stride = PixelWidth << 2; // 扫描行跨距 Byte[] Pixels = new Byte[PixelHeight * Stride]; if (bitmap.Format == PixelFormats.Bgr32 || bitmap.Format == PixelFormats.Bgra32) { // 拷贝像素数据 bitmap.CopyPixels(Pixels, Stride, 0); } else { // 先进行像素格式转换，再拷贝像素数据 new FormatConvertedBitmap(bitmap, PixelFormats.Bgr32, null, 0).CopyPixels(Pixels, Stride, 0); } // 将像素数据转换为彩色数组 Color[,] ColorArray = new Color[PixelHeight, PixelWidth]; for (Int32 i = 0; i < PixelHeight; i++) { for (Int32 j = 0; j < PixelWidth; j++) { Int32 Index = i * Stride + (j << 2); ColorArray[i, j].B = Pixels[Index]; ColorArray[i, j].G = Pixels[Index + 1]; ColorArray[i, j].R = Pixels[Index + 2]; ColorArray[i, j].A = Pixels[Index + 3]; } } return ColorArray; } /// <summary> /// 将位图转换为灰度数组（256级灰度） /// </summary> /// <param name="bitmap">原始位图</param> /// <returns>灰度数组</returns> /// <remarks>扩展方法</remarks> public static Byte[,] ToGrayArray(this BitmapSource bitmap) { // 将像素格式统一到Bgr32，并提取图像数据 Int32 PixelHeight = bitmap.PixelHeight; // 图像高度 Int32 PixelWidth = bitmap.PixelWidth; // 图像宽度 Int32 Stride = PixelWidth << 2; // 扫描行跨距 Byte[] Pixels = new Byte[PixelHeight * Stride]; if (bitmap.Format == PixelFormats.Bgr32 || bitmap.Format == PixelFormats.Bgra32) { // 拷贝像素数据 bitmap.CopyPixels(Pixels, Stride, 0); } else { // 先进行像素格式转换，再拷贝像素数据 new FormatConvertedBitmap(bitmap, PixelFormats.Bgr32, null, 0).CopyPixels(Pixels, Stride, 0); } // 将像素数据转换为灰度数组 Byte[,] GrayArray = new Byte[PixelHeight, PixelWidth]; for (Int32 i = 0; i < PixelHeight; i++) { for (Int32 j = 0; j < PixelWidth; j++) { Int32 Index = i * Stride + (j << 2); GrayArray[i, j] = Convert.ToByte((Pixels[Index + 2] * 19595 + Pixels[Index + 1] * 38469 + Pixels[Index] * 7471 + 32768) >> 16); } } return GrayArray; } /// <summary> /// 位图灰度化 /// </summary> /// <param name="bitmap">原始位图</param> /// <returns>灰度位图</returns> /// <remarks>扩展方法</remarks> public static BitmapSource ToGrayBitmap(this BitmapSource bitmap) { // 将像素格式统一到Bgr32，并提取图像数据 Int32 PixelHeight = bitmap.PixelHeight; // 图像高度 Int32 PixelWidth = bitmap.PixelWidth; // 图像宽度 Int32 Stride = PixelWidth << 2; // 扫描行跨距 Byte[] Pixels = new Byte[PixelHeight * Stride]; if (bitmap.Format == PixelFormats.Bgr32 || bitmap.Format == PixelFormats.Bgra32) { // 拷贝像素数据 bitmap.CopyPixels(Pixels, Stride, 0); } else { // 先进行像素格式转换，再拷贝像素数据 new FormatConvertedBitmap(bitmap, PixelFormats.Bgr32, null, 0).CopyPixels(Pixels, Stride, 0); } // 将像素数据转换为灰度数据 Int32 GrayStride = ((PixelWidth + 3) >> 2) << 2; Byte[] GrayPixels = new Byte[PixelHeight * GrayStride]; for (Int32 i = 0; i < PixelHeight; i++) { for (Int32 j = 0; j < PixelWidth; j++) { Int32 Index = i * Stride + (j << 2); GrayPixels[i * GrayStride + j] = Convert.ToByte((Pixels[Index + 2] * 19595 + Pixels[Index + 1] * 38469 + Pixels[Index] * 7471 + 32768) >> 16); } } // 从灰度数据中创建灰度图像 return BitmapSource.Create(PixelWidth, PixelHeight, 96, 96, PixelFormats.Indexed8, BitmapPalettes.Gray256, GrayPixels, GrayStride); } /// <summary> /// 将灰度数组转换为灰度图像（256级灰度） /// </summary> /// <param name="grayArray">灰度数组</param> /// <returns>灰度图像</returns> public static BitmapSource GrayArrayToGrayBitmap(Byte[,] grayArray) { // 将灰度数组转换为灰度数据 Int32 PixelHeight = grayArray.GetLength(0); // 图像高度 Int32 PixelWidth = grayArray.GetLength(1); // 图像宽度 Int32 Stride = ((PixelWidth + 3) >> 2) << 2; // 扫描行跨距 Byte[] Pixels = new Byte[PixelHeight * Stride]; for (Int32 i = 0; i < PixelHeight; i++) { for (Int32 j = 0; j < PixelWidth; j++) { Pixels[i * Stride + j] = grayArray[i, j]; } } // 从灰度数据中创建灰度图像 return BitmapSource.Create(PixelWidth, PixelHeight, 96, 96, PixelFormats.Indexed8, BitmapPalettes.Gray256, Pixels, Stride); } /// <summary> /// 将二值化数组转换为二值化图像 /// </summary> /// <param name="binaryArray">二值化数组</param> /// <returns>二值化图像</returns> public static BitmapSource BinaryArrayToBinaryBitmap(Byte[,] binaryArray) { // 将二值化数组转换为二值化数据 Int32 PixelHeight = binaryArray.GetLength(0); Int32 PixelWidth = binaryArray.GetLength(1); Int32 Stride = ((PixelWidth + 31) >> 5) << 2; Byte[] Pixels = new Byte[PixelHeight * Stride]; for (Int32 i = 0; i < PixelHeight; i++) { Int32 Base = i * Stride; for (Int32 j = 0; j < PixelWidth; j++) { if (binaryArray[i, j] != 0) { Pixels[Base + (j >> 3)] |= Convert.ToByte(0x80 >> (j & 0x7)); } } } // 从灰度数据中创建灰度图像 return BitmapSource.Create(PixelWidth, PixelHeight, 96, 96, PixelFormats.Indexed1, BitmapPalettes.BlackAndWhite, Pixels, Stride); } }}
