DCT压缩图片整个流程实现

此代码实现了DCT压缩图片的整个过程，包含交互的界面，可根据输入的压缩率等进行图片压缩

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;

namespace ImageCompress
{
    class DCT
    {
        #region Public interface

        // 事件处理
        public delegate void OnImageProcessedHandler（Bitmap ProcessedImage）;
        public static event OnImageProcessedHandler OnImageProcessed;

        // 类的唯一公共接口
        public static void compressImage（Bitmap img int coefficient int DistortionRate int compressionRate）
        {
            // 初始化入口
            double[] alpha = create_alpha（coefficient）;

            // 得到像素的RGB值
            double[] R; double[] G; double[] B;
            convertToArray（img out R out G out B coefficient）;

            // DCT
            R = dct（R coefficient alpha）;
            G = dct（G coefficient alpha）;
            B = dct（B coefficient alpha）;

            // 压缩
            compress（ref R coefficient DistortionRate compressionRate）;
            compress（ref G coefficient DistortionRate compressionRate）;
            compress（ref B coefficient DistortionRate compressionRate）;

            // IDCT
            R = idct（R coefficient alpha）;
            G = idct（G coefficient alpha）;
            B = idct（B coefficient alpha）;

            if （OnImageProcessed != null） OnImageProcessed（convertToImage（R G B img.Size））;
        }

        #endregion

        #region DCT & IDCT

        //离散余弦变换
        private static double[] dct（double[] imgArray int coefficient double[] alpha）
        {
            int width = imgArray.GetLength（0）;
            int height = imgArray.GetLength（1）;

            // 构建矩阵
            double[] C = new double[width height];

            // 遍历块
            for （int x = 0; x < width; x += coefficient）
            {
                for （int y = 0; y < height; y += coefficient）
                {
                    // 遍历块内的像素点
                    double[] f = clipArray（imgArray coefficient x y）;

                    for （int u = x; u < coefficient + x; ++u）
                    {
                        for （int v = y; v < coefficient + y; ++v）
                        {
                            // 计算DCT总和
                            double sum = 0;
                            for （int ii = 0; ii < coefficient; ++ii）
                            {
                                for （int jj = 0; jj < coefficient; ++jj）
                                {
                                    sum += f[ii jj] * Math.Cos（（2 * ii + 1） * （u - x） * Math.PI / （2 * coefficient）） *
                                                     Math.Cos（（2 * jj + 1） * （v - y） * Math.PI / （2 * coefficient））;
                                }
                            }
                            C[u v] = alpha[u - x] * alpha[v - y] * sum;
                        }
                    }
              

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-12-25 21:48  222017321062028 李姗姗 交互实验7-9\
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\
     文件      478208  2018-12-25 21:21  222017321062028 李姗姗 交互实验7-9\ImageCompress.exe
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\
     文件       62976  2018-12-25 21:42  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\.suo
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\Server\
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\
     文件           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\db.lock
     文件      606208  2018-12-25 10:21  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\storage.ide
     文件       32768  2018-12-25 21:38  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\storage.ide-shm
     文件     4140632  2018-12-25 21:38  222017321062028 李姗姗 交互实验7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\storage.ide-wal
     目录           0  2018-12-25 21:37  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\
     文件        2055  2018-12-25 21:42  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress.sln
     文件         189  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\App.config
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\bin\
     目录           0  2018-12-24 22:53  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\bin\Debug\
     文件      478208  2018-12-25 21:21  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\bin\Debug\ImageCompress.exe
     文件         189  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\bin\Debug\ImageCompress.exe.config
     文件       44544  2018-12-25 21:21  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\bin\Debug\ImageCompress.pdb
     文件       10610  2018-12-25 21:36  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\DCT.cs
     文件        5596  2018-12-25 21:37  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\Form1.cs
     文件       17431  2018-12-25 10:21  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\Form1.Designer.cs
     文件      667658  2018-12-25 10:21  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\Form1.resx
     文件        3648  2018-12-24 22:53  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\ImageCompress.csproj
     目录           0  2018-12-24 20:49  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\obj\
     目录           0  2018-12-25 10:21  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\obj\Debug\
     文件        1443  2018-12-25 00:00  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        7220  2018-12-24 22:28  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件          42  2018-12-24 22:28  222017321062028 李姗姗 交互实验7-9\ImageCompress\ImageCompress\obj\Debug\ImageCompress.csproj.CoreCompileInputs.cache
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