图像信号的统计特性

实验二的参考程序：http://blog.sina.com.cn/s/blog_1539a69800102x58j.html

clear,clc;close all;obj = mmreader('F:\云盘同步文件夹\同步文件夹2\课程资料\2015-2016第二学期课程\视频技术实验\实验四\MicroAirVehicle.avi');video = read(obj);%获取前两帧图像数据videoFrame1 = video(:,:,:,25);i1=rgb2gray(videoFrame1);videoFrame2 = video(:,:,:,60);i2=rgb2gray(videoFrame2);%求两帧差值[m,n]=size(i1);i3=zeros(size(i1));for i=1:m    for j=1:n        i3(i,j)=abs(i2(i,j)-i1(i,j));    end;end;%显示各图像figure(1);subplot(2,2,1);imagesc(videoFrame1);%imagesc(i1);title('第一帧图像');axis off;subplot(2,2,2);%imagesc(i2);imagesc(videoFrame2);title('第二帧图像');axis off;subplot(2,2,3);imagesc(i3);title('差值图像');colormap(gray);axis off;subplot(2,2,4);I=reshape(i3,m*n,1);hist(I);title('灰度直方图');%%figure(2);%Ym=i3(96,:);%提取一行Ym=i3(:,100);%提取一行%画出各帧中心像素变化图subplot(211);stem(Ym);title('每帧图像中心点像素分析图');xlabel('帧数');ylabel('像素值');grid on;subplot(212);hist(Ym,15);