【图像压缩】图像无损压缩含Matlab源码

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本文介绍了使用MATLAB进行JPEG图像压缩的方法，重点讨论了离散余弦变换（DCT）在压缩过程中的应用。通过仿真实验，展示了MATLAB实现DCT图像压缩的简易性、高效性和精确性，提高了图像压缩的效率和质量。

1 简介

介绍了JPEG图像压缩算法,并在MATLAB数学分析工具环境下从实验角度出发,较为直观地探讨了DCT在JPEG图像压缩中的应用.仿真实验表明,用MATLAB来实现离散余弦变换的图像压缩,具有方法简单,速度快,误差小的优点,大大提高了图像压缩的效率和精度.

2 部分代码

function varargout = ImageCompression1(varargin)% IMAGECOMPRESSION1 MATLAB code for ImageCompression1.fig%      IMAGECOMPRESSION1, by itself, creates a new IMAGECOMPRESSION1 or raises the existing%      singleton*.%%      H = IMAGECOMPRESSION1 returns the handle to a new IMAGECOMPRESSION1 or the handle to%      the existing singleton*.%%      IMAGECOMPRESSION1('CALLBACK',hObject,eventData,handles,...) calls the local%      function named CALLBACK in IMAGECOMPRESSION1.M with the given input arguments.%%      IMAGECOMPRESSION1('Property','Value',...) creates a new IMAGECOMPRESSION1 or raises the%      existing singleton*.  Starting from the left, property value pairs are%      applied to the GUI before ImageCompression1_OpeningFcn gets called.  An%      unrecognized property name or invalid value makes property application%      stop.  All inputs are passed to ImageCompression1_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 ImageCompression1% Last Modified by GUIDE v2.5 15-Oct-2014 22:20:56% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...                   'gui_Singleton',  gui_Singleton, ...                   'gui_OpeningFcn', @ImageCompression1_OpeningFcn, ...                   'gui_OutputFcn',  @ImageCompression1_OutputFcn, ...                   'gui_LayoutFcn',  [] , ...                   'gui_Callback',   []);if nargin && ischar(varargin{1})    gui_State.gui_Callback = str2func(varargin{1});endif 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 ImageCompression1 is made visible.function ImageCompression1_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 ImageCompression1 (see VARARGIN)% Choose default command line output for ImageCompression1handles.output = hObject;% Update handles structureguidata(hObject, handles);guidata(hObject, handles);set(handles.axes1,'visible','off')set(handles.axes2,'visible','off')axis offaxis off% UIWAIT makes ImageCompression1 wait for user response (see UIRESUME)% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.function varargout = ImageCompression1_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)