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

????????//?事件處理
????????public?delegate?void?OnImageProcessedHandler（Bitmap?ProcessedImage）;
????????public?static?event?OnImageProcessedHandler?OnImageProcessed;

????????//?類的唯一公共接口
????????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）;

????????????//?壓縮
????????????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

????????//離散余弦變換
????????private?static?double[]?dct（double[]?imgArray?int?coefficient?double[]?alpha）
????????{
????????????int?width?=?imgArray.GetLength（0）;
????????????int?height?=?imgArray.GetLength（1）;

????????????//?構建矩陣
????????????double[]?C?=?new?double[width?height];

????????????//?遍歷塊
????????????for?（int?x?=?0;?x?????????????{
????????????????for?（int?y?=?0;?y?????????????????{
????????????????????//?遍歷塊內的像素點
????????????????????double[]?f?=?clipArray（imgArray?coefficient?x?y）;

????????????????????for?（int?u?=?x;?u?????????????????????{
????????????????????????for?（int?v?=?y;?v?????????????????????????{
????????????????????????????//?計算DCT總和
????????????????????????????double?sum?=?0;
????????????????????????????for?（int?ii?=?0;?ii?????????????????????????????{
????????????????????????????????for?（int?jj?=?0;?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;
????????????????????????}
????????????????????}
??????????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-25?21:48??222017321062028?李姍姍?交互實驗7-9\
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\
?????文件??????478208??2018-12-25?21:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress.exe
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\
?????文件???????62976??2018-12-25?21:42??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\.suo
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\Server\
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\
?????文件???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\db.lock
?????文件??????606208??2018-12-25?10:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\storage.ide
?????文件???????32768??2018-12-25?21:38??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\storage.ide-shm
?????文件?????4140632??2018-12-25?21:38??222017321062028?李姍姍?交互實驗7-9\ImageCompress\.vs\ImageCompress\v15\Server\sqlite3\storage.ide-wal
?????目錄???????????0??2018-12-25?21:37??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\
?????文件????????2055??2018-12-25?21:42??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress.sln
?????文件?????????189??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\App.config
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\bin\
?????目錄???????????0??2018-12-24?22:53??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\bin\Debug\
?????文件??????478208??2018-12-25?21:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\bin\Debug\ImageCompress.exe
?????文件?????????189??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\bin\Debug\ImageCompress.exe.config
?????文件???????44544??2018-12-25?21:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\bin\Debug\ImageCompress.pdb
?????文件???????10610??2018-12-25?21:36??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\DCT.cs
?????文件????????5596??2018-12-25?21:37??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\Form1.cs
?????文件???????17431??2018-12-25?10:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\Form1.Designer.cs
?????文件??????667658??2018-12-25?10:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\Form1.resx
?????文件????????3648??2018-12-24?22:53??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\ImageCompress.csproj
?????目錄???????????0??2018-12-24?20:49??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\obj\
?????目錄???????????0??2018-12-25?10:21??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\obj\Debug\
?????文件????????1443??2018-12-25?00:00??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\obj\Debug\DesignTimeResolveAssemblyReferences.cache
?????文件????????7220??2018-12-24?22:28??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
?????文件??????????42??2018-12-24?22:28??222017321062028?李姍姍?交互實驗7-9\ImageCompress\ImageCompress\obj\Debug\ImageCompress.csproj.CoreCompileInputs.cache
............此處省略20個文件信息