function?varargout?=?DCT（varargin）
gui_Singleton?=?1;
gui_State?=?struct（‘gui_Name‘???????mfilename?...
???????????????????‘gui_Singleton‘??gui_Singleton?...
???????????????????‘gui_OpeningFcn‘?@DCT_OpeningFcn?...
???????????????????‘gui_OutputFcn‘??@DCT_OutputFcn?...
???????????????????‘gui_LayoutFcn‘??[]??...
???????????????????‘gui_Callback‘???[]）;
if?nargin?&&?ischar（varargin{1}）
????gui_State.gui_Callback?=?str2func（varargin{1}）;
end

if?nargout
????[varargout{1:nargout}]?=?gui_mainfcn（gui_State?varargin{:}）;
else
????gui_mainfcn（gui_State?varargin{:}）;
end
%?End?initialization?code?-?DO?NOT?EDIT


%?---?Executes?just?before?DCT?is?made?visible.
function?DCT_OpeningFcn（hobject?eventdata?handles?varargin）
handles.output?=?hobject;

%?Update?handles?structure
guidata（hobject?handles）;


%?---?Outputs?from?this?function?are?returned?to?the?command?line.
function?varargout?=?DCT_OutputFcn（hobject?eventdata?handles）?
varargout{1}?=?handles.output;


%?---?Executes?on?button?press?in?Sure.
function?Sure_Callback（hobject?eventdata?handles）
global?image;?%至關(guān)重要??！
%如果不再一次用global?image，那么就調(diào)用不了sure里的變量
%同時還會報(bào)錯說類型不對...struct...Image之類的

temp?=?get（handles.argument‘string‘）;
argument?=?str2double（temp）;
image_compress?=?dct_compress_function（imageargument）;
axes（handles.axes2）;
imshow（image_compress）;
title（‘變換后圖像‘）;
%PSNR
psnr?=?PSNR_compute（imageimage_compress）;
set（handles.PSNR‘string‘psnr）;

%compression?ratio
set（handles.compress_rate‘string‘rate）;


function?argument_Callback（hobject?eventdata?handles）


%?---?Executes?during?object?creation?after?setting?all?properties.
function?argument_CreateFcn（hobject?eventdata?handles）

if?ispc?&&?isequal（get（hobject‘BackgroundColor‘）?get（0‘defaultUicontrolBackgroundColor‘））
????set（hobject‘BackgroundColor‘‘white‘）;
end

function?PSNR_Callback（hobject?eventdata?handles）

function?PSNR_CreateFcn（hobject?eventdata?handles）
if?ispc?&&?isequal（get（hobject‘BackgroundColor‘）?get（0‘defaultUicontrolBackgroundColor‘））
????set（hobject‘BackgroundColor‘‘white‘）;
end


%?--------------------------------------------------------------------
function?File_Callback（hobject?eventdata?handles）


%?--------------------------------------------------------------------
function?Open_File_Callback（hobject?eventdata?handles）
global?image;
[filenamepathname]=uigetfile（{‘*.bmp;*.jpg;*.png;*.jpeg;*.tif‘}‘選擇圖像‘）;
if?isequal（filename0）||isequal（pathname0）
????warndlg（‘Please?select?a?picture?first!‘‘Warning‘）;
????return;
else
????str=[pathname?filename];
????image=?imread（str）;
????axes（handles.axes1）;
????imshow（image）;
????title（‘原始圖像‘）;
end

%?--------------------------------------------------------------------
function?Save_File_Callback（hobject?eventdata?handles）
[FileNamePathName]?=?uiputfile（{‘*.jpg‘‘JPEG（*.jpg）‘;...
?????????????????????????????????‘*.bmp‘‘Bitmap（*.bmp）‘;...
?????????????????????????????????‘*.gif‘‘GIF（*.gif）‘;...
?????????????????????????????????‘*.*‘

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件??????34641??2018-12-31?23:23??DCT.fig

?????文件???????3584??2018-12-31?23:23??DCT.m

?????文件???????4951??2019-01-03?21:47??dct_compress_function.m

?????文件????????448??2018-12-31?17:41??Inverse_function.m

?????文件??????19181??2018-12-31?16:53??lena.jpg

?????文件????????322??2018-12-31?17:56??PSNR_compute.m

-----------?---------??----------?-----??----

????????????????63127????????????????????6