基于MATLAB的背景差分目标跟踪系统

以前的数字图像处理的课设, 有需要的同志自取

clc;
clear;

video = VideoReader('4.mp4');    %读取视频
vidHeight = video.Height;        %视频高度
vidWidth = video.Width;          %视频宽度
nFrames = video.NumberOfFrames-5;  %视频总帧数(去掉了一些不必要的东西)
s = read(video,[1,nFrames]);     %获取所有视频帧

% 储存背景图像矩阵
r = zeros(vidHeight,vidWidth);
g = zeros(vidHeight,vidWidth);
b = zeros(vidHeight,vidWidth);

% 提取背景图像
for i=1:nFrames
    img = s(:,:,:,i);
    R = double(img(:,:,1));
    G = double(img(:,:,2));
    B = double(img(:,:,3));
    r = r + R/(nFrames-1);
    g = g + G/(nFrames-1);
    b = b + B/(nFrames-1);
end
r = uint8(r);
g = uint8(g);
b = uint8(b);

% 显示背景图片
% Img(:,:,1) = uint8(r);
% Img(:,:,2) = uint8(g);
% Img(:,:,3) = uint8(b);
% imshow(Img);

% 实际背景图片(纯白)(useless)
background = uint8(255 * ones(vidHeight,vidWidth,3));

% 寻找目标区域
for k=1:nFrames
    % img = s(:,:,:,k);
    x = uint16([]);
    y = uint16([]);
    % 获取对应的像素点数组(x,y)
    for i=1:vidHeight
        for j=1:vidWidth
            % 实际检测条件: (s(i,j,1,k)-r(i,j))>20 && (s(i,j,2,k)-g(i,j))>20 && (s(i,j,3,k)-b(i,j))>70
            if ((255-s(i,j,1,k))<20 && (255-s(i,j,2,k))>230 && (255-s(i,j,3,k))>230)
                x = [x i];
                y = [y j];
            end
        end
    end
    % 绘制矩形框(宽2像素)
    max_x = max(max(x));
    max_y = max(max(y));
    min_x = min(min(x));
    min_y = min(min(y));
    for m=min_x:max_x
        s(m,min_y,1,k) = 0;s(m,min_y,2,k) = 0;s(m,min_y,3,k) = 0;
        s(m,min_y-1,1,k) = 0;s(m,min_y-1,2,k) = 0;s(m,min_y-1,3,k) = 0;
        s(m,max_y,1,k) = 0;s(m,max_y,2,k) = 0;s(m,max_y,3,k) = 0;
        s(m,max_y+1,1,k) = 0;s(m,max_y+1,2,k) = 0;s(m,max_y+1,3,k) = 0;
    end
    for n=min_y:max_y
        s(min_x,n,1,k) = 0;s(min_x,n,2,k) = 0;s(min_x,n,3,k) = 0;
        s(min_x-1,n,1,k) = 0;s(min_x-1,n,2,k) = 0;s(min_x-1,n,3,k) = 0;
        s(max_x,n,1,k) = 0;s(max_x,n,2,k) = 0;s(max_x,n,3,k) = 0;
        s(max_x+1,n,1,k) = 0;s(max_x+1,n,2,k) = 0;s(max_x+1,n,3,k) = 0;
    end
    % imshow(s(:,:,:,k));
    
    % 播放视频(存在窗口大小的问题)
%     mov(k).cdata = s(:,:,:,k);
%     mov(k).colormap = [];
    
    % 保存每一帧图片
    imwrite(s(:,:,:,k),strcat('D:\MATLAB\R2019a\bin\project\Output\video_frame',num2str(k),'.jpg'));
end

% 播放视频
% movie(mov);

% 合成视频                     
writerObj = VideoWriter('Output.avi');  
open(writerObj);
for i=1:nFrames
   frame = imread(strcat('D:\MATLAB\R2019a\bin\project\Output\video_frame',num2str(i),'.jpg'));%从文件夹中读取图像
   writeVideo(writerObj,frame);
end
close(writerObj);
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