一、简介
基于matlab霍夫曼图像压缩重建，过程为：1.符号概率 2.合并概率 3.更新概率 4.分配码字 。
二、源代码
function varargout = MainForm(varargin)
% MAINFORM MATLAB code for MainForm.fig
% MAINFORM, by itself, creates a new MAINFORM or raises the existing
% singleton*.
%
% H = MAINFORM returns the handle to a new MAINFORM or the handle to
% the existing singleton*.
%
% MAINFORM('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in MAINFORM.M with the given input arguments.
%
% MAINFORM('Property','Value',...) creates a new MAINFORM or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before MainForm_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to MainForm_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 MainForm
% Last Modified by GUIDE v2.5 19-May-2021 11:20:45
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @MainForm_OpeningFcn, ...
'gui_OutputFcn', @MainForm_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 MainForm is made visible.
function MainForm_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 MainForm (see VARARGIN)
% Choose default command line output for MainForm
handles.output = hObject;
clc;
% axis(handles.axes1); cla reset; box on;
% set(gca, 'XTickLabel', '', 'YTickLabel', '');
%
% axis(handles.axes2); cla reset; box on;
% set(gca, 'XTickLabel', '', 'YTickLabel', '');
handles.Img = 0;
handles.ImgH = 0;
handles.ImgL = 0;
handles.strH = 0;
handles.strL = 0;
InitFig(hObject,handles);
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes MainForm wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = MainForm_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 File_Callback(hObject, eventdata, handles)
% hObject handle to File (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --------------------------------------------------------------------
function OpenFile_Callback(hObject, eventdata, handles)
% hObject handle to OpenFile (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% 打开
warning off all;
% 载入图像
[FileName,PathName,FilterIndex] = uigetfile({'*.bmp;*.jpg;*.tif;*.png;*.gif', ...
'所有图像文件';...
'*.*','所有文件' },'载入图像',...
'.\images\\lena.bmp');
if isequal(FileName, 0) || isequal(PathName, 0)
return;
end
InitFig(hObject, handles);
Img = imread(fullfile(PathName, FileName));
axes(handles.axes1);
imshow(Img, []);
handles.Img = Img;
handles.ImgH = 0;
handles.ImgL = 0;
guidata(hObject, handles);
function textInfo_Callback(hObject, eventdata, handles)
% hObject handle to textInfo (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 textInfo as text
% str2double(get(hObject,'String')) returns contents of textInfo as a double
% --- Executes during object creation, after setting all properties.
function textInfo_CreateFcn(hObject, eventdata, handles)
% hObject handle to textInfo (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 SnapImg_Callback(hObject, eventdata, handles)
% hObject handle to SnapImg (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% 截图
SnapImage();
% --------------------------------------------------------------------
function SaveImg_Callback(hObject, eventdata, handles)
% hObject handle to SaveImg (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% 保存
if isequal(handles.ImgH, 0) && isequal(handles.ImgL, 0)
msgbox('请进行压缩处理！', '提示信息');
return;
end
if ~isequal(handles.ImgH, 0)
SaveImage(handles.ImgH);
end
if ~isequal(handles.ImgL, 0)
SaveImage(handles.ImgL);
end
msgbox('处理结果保存成功！', '提示信息');
% --------------------------------------------------------------------
function Exit_Callback(hObject, eventdata, handles)
% hObject handle to Exit (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
close();
% --------------------------------------------------------------------
function CompressAlgorithm_Callback(hObject, eventdata, handles)
% hObject handle to CompressAlgorithm (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --------------------------------------------------------------------
function Huffman_Callback(hObject, eventdata, handles)
% hObject handle to Huffman (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
if isequal(handles.Img, 0)
msgbox('请载入图像！', '提示信息');
return;
end
if isequal(handles.ImgH, 0)
dataImg = rgb2gray(dataImg);
end
sz = size(dataImg);
[zipped,info] = Mat2Huff(dataImg);
unzipped = Huff2Mat(zipped, info);
dataImg = double(reshape(dataImg, sz));
unzipped = double(reshape(unzipped, sz));
info_dataImg = whos('dataImg');
info_zipped = whos('zipped');
info_unzipped = whos('unzipped');
S = PSNR(dataImg, unzipped);
str0 = sprintf('-----------------霍夫曼压缩-----------------\n');
str1 = sprintf('原始数据维数为：%s，占用空间大小为：%d\n', num2str(info_dataImg.size), info_dataImg.bytes);
str2 = sprintf('解压数据维数为：%s，占用空间大小为：%d\n', num2str(info_unzipped.size), info_unzipped.bytes);
str3 = sprintf('压缩数据维数为：%s，占用空间大小为：%d\n', num2str(info_zipped.size), info_zipped.bytes);
str4 = sprintf('压缩比为：%.3f%%\n', info_zipped.bytes/info_dataImg.bytes*100);
str5 = sprintf('PSNR：%.3f\n', S);
strH = [str0 str1 str2 str3 str4 str5];
set(handles.textInfo, 'String', strH);
handles.strH = strH;
handles.ImgH = tm;
guidata(hObject, handles);
else
set(handles.textInfo, 'String', handles.strH);
axes(handles.axes2); imshow(mat2gray(handles.ImgH), []);
end
三、运行结果
四、备注
版本：2014a
