WPF:图像处理(二)图像的灰度化

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/* ----------------------------------------------------------
 * 文件名称:WPFGray.cs
 * 作者:秦建辉
 * 
 * QQ:36748897
 * 
 * 博客:http://www.firstsolver.com/wordpress/
 * 
 * 开发环境:
 *      Visual Studio V2010
 *      .NET Framework 4 Client Profile
 *      
 * 版本历史:
 *      V1.0    2012年04月16日
 *              基于WPF的图像灰度化
------------------------------------------------------------ */
using System;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace Splash.WPF.Imaging
{
    /// <summary>
    /// 图像处理:灰度化
    /// </summary>
    public static partial class ImageUtils
    {
        /// <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;         // 跨距宽度
            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;         // 跨距宽度
            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;         // 跨距宽度
            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;    // 跨距宽度
            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);   // 图像高度
            Int32 PixelWidth = binaryArray.GetLength(1);    // 图像宽度
            Int32 Stride = ((PixelWidth + 31) >> 5) << 2;   // 跨距宽度
            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));
                    }
                }
            }

            // 创建黑白图像
            return BitmapSource.Create(PixelWidth, PixelHeight, 96, 96, PixelFormats.Indexed1, BitmapPalettes.BlackAndWhite, Pixels, Stride);
        }
    }
}

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