图像压缩基于matlab GUI DCT图像压缩（压缩率可调）【含Matlab源码 1049期】.zip

function varargout = imDCT(varargin) % IMDCT M-file for imDCT.fig % IMDCT, by itself, creates a new IMDCT or raises the existing % singleton*. % % H = IMDCT returns the handle to a new IMDCT or the handle to % the existing singleton*. % % IMDCT('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in IMDCT.M with the given input arguments. % % IMDCT('Property','Value',...) creates a new IMDCT or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before imDCT_OpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to imDCT_OpeningFcn via varargin. % % *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)". % % See also: GUIDE, GUIDATA, GUIHANDLES % Edit the above text to modify the response to help imDCT % Last Modified by GUIDE v2.5 07-Jun-2021 19:54:09 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @imDCT_OpeningFcn, ... 'gui_OutputFcn', @imDCT_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 imDCT is made visible. function imDCT_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to imDCT (see VARARGIN) % Choose default command line output for imDCT handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes imDCT wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = imDCT_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Get default command line output from handles structure varargout{1} = handles.output; function edit1_Callback(hObject, eventdata, handles) % hObject handle to edit1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: get(hObject,'String') returns contents of edit1 as text % str2double(get(hObject,'String')) returns contents of edit1 as a double % --- Executes during object creation, after setting all properties. function edit1_CreateFcn(hObject, eventdata, handles) % hObject handle to edit1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: edit controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end function edit2_Callback(hObject, eventdata, handles) % hObject handle to edit2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % Hints: get(hObject,'String') returns contents of edit2 as text % str2double(get(hObject,'String')) returns contents of edit2 as a double % --- Executes during object creation, after setting all properties. function edit2_CreateFcn(hObject, eventdata, handles) % hObject handle to edit2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called % Hint: edit controls usually have a white background on Windows. % See ISPC and COMPUTER. if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor','white'); end % --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles) ImgPath=get(handles.edit1,'String'); CompressRate=uint8(fix(str2num(get(handles.edit2,'String')))); if CompressRate>64 CompressRate=64; end if CompressRate<1 CompressRate=1; end set(handles.edit2,'String',num2str(CompressRate)); img=imread(ImgPath); axes(handles.axes1); imshow(img); set(handles.text7,'Visible','off'); set(handles.text7,'String','处理状态：正在处理中...'); set(handles.text7,'Visible','on'); pause(0.1); Block=ceil(size(img)/8); ImgDCT=zeros(Block*8); ImgRestoreTemp=zeros(Block*8); ImgRestore=zeros(size(img)); ImgBlock=zeros(8); DCTBlock=zeros(8); vector=zeros(1,64); for ii=1:Block(1) for jj=1:Block(2) ImgBlock(:,:)=zeros(8); if ii==Block(1) if jj==Block(2) ImgBlock(1:size(img,1)-(ii-1)*8,1:size(img,2)-(jj-1)*8)=img((ii-1)*8+1:size(img,1),(jj-1)*8+1:size(img,2)); else ImgBlock(1:size(img,1)-(ii-1)*8,:)=img((ii-1)*8+1:size(img,1),(jj-1)*8+1:jj*8); end else if jj==Block(2) ImgBlock(:,1:size(img,2)-(jj-1)*8)=img((ii-1)*8+1:ii*8,(jj-1)*8+1:size(img,2)); else ImgBlock(:,:)=img((ii-1)*8+1:ii*8,(jj-1)*8+1:jj*8); end end DCTBlock(:,:)=dct2(ImgBlock(:,:)); if CompressRate~=64 vector(1:64)=m2v(DCTBlock(:,:)); vector(CompressRate+1:64)=0; DCTBlock(:,:)=v2m(vector(1:64)); end ImgDCT((ii-1)*8+1:ii*8,(jj-1)*8+1:jj*8)=DCTBlock(:,:); end end for ii=1:Block(1) for jj=1:Block(2) DCTBlock(:,:)=ImgDCT((ii-1)*8+1:ii*8,(jj-1)*8+1:jj*8); ImgBlock(:,:)=idct2(DCTBlock(:,:)); ImgRestoreTemp((ii-1)*8+1:ii*8,(jj-1)*8+1:jj*8)=ImgBlock(:,:); end end ImgRestore(:,:)=ImgRestoreTemp(1:size(ImgRestore,1),1:size(ImgRestore,2)); ImgRestore=uint8(ImgRestore); ErrorTemp=imabsdiff(img,ImgRestore); MSE=sum(sum(ErrorTemp.*ErrorTemp))/(size(img,1)*size(img,2)); PSNR=10*log(65535/MSE); strPSNR=['PSNR：',num2str(PSNR)]; axes(handles.axes2); imshow(ImgRestore); imwrite(ImgRestore,'GIRL2.BMP','bmp'); set(handles.text7,'String','处理状态：处理完成！'); set(handles.text8,'String',strPSNR); set(handles.text8,'Visible','on'); % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) function vector=m2v(matrix) subscript=[1,2,6,7,15,16,28,29;... 3,5,8,14,17,27,30,43;... 4,9,13,18,26,31,42,44;... 10,12,19,25,32,41,45,54;... 11,20,24,33,40,46,53,55;... 21,23,34,39,47,52,56,61;... 22,35,38,48,51,57,60,62;... 36,37,49,50,58,59,63,64]; vectorTemp=zeros(1,64); for ii=1:8 for jj=1:8 vectorTemp(subscript(ii,jj))=matrix(ii,jj); end end vector=vectorTemp; function matrix=v2m(vector) subscript=[1,2,6,7,15,16,28,29;... 3,5,8,14,17,27,30,43;... 4,9,13,18,26,31,42,44;... 10,12,19,25,32,41,45,54;... 11,20,24,33,40,46,53,55;... 21,23,34,39,47,52,56,61;... 22,35,38,48,51,57,60,62;... 36,37,49,50,58,59,63,64]; matrixTemp=zeros(8,8); for ii=1:8 for jj=1:8 matrixTemp(ii,jj)=vector(subscript(ii,jj)); end end matrix=matrixTemp;