创建以YUVtoJPEG为名称的M文件，读取CIF格式的YUV文件mobile_cif_300f.yuv的前30帧，并逐一以jpg格式保存各视频帧至当前目录下，

[qq_31675717]

创建以YUVtoJPEG为名称的M文件，读取CIF格式的YUV文件mobile_cif_300f.yuv的前30帧，并逐一以jpg格式保存各视频帧至当前目录下，视频帧帧号命名相对应的jpg图片,并生成第2帧至第30帧的在Y通道上与前一帧的残差图像，以BMP格式、以视频帧帧号命名，保存至当前目录下！


function [Y,U,V] = ReadMultiFrames(yuvfilename,format,init2last)
%该函数用于将yuv格式的视频连续多帧分别读入到三维数组Y,U,V之中
%yuv视频的采样格式为4：2：0
%输入参数：
% yuvfilename ---- 视频yuv文件路径名
% format ---- 视频格式(格式名or分辨率[rows,cols])
% init2last ---- 读取的视频帧的范围[初始帧序号，终止帧序号]
%输出参数：
% Y ---- 亮度，三维数组，第三维为帧序号，前两维是单帧的行和列
% U,V ---- 色差，三维数组，第三维为帧序号，前两维是单帧的行和列
%调用示范：
% [Y,U,V] = ReadMultiFrames('.\videoname.yuv','cif',[100,101]);
% [Y,U,V] = ReadMultiFrames('.\videoname.yuv',[288,352],[100,101]);
close all;
if ischar(format)
format = lower(format);
switch format
case 'sub_qcif'
cols = 128; rows = 96;
case 'qcif'
cols = 176; rows = 144;
case 'cif'
cols = 352; rows = 288;
case 'sif'
cols = 352; rows = 240;
case '4cif'
cols = 704; rows = 576;
otherwise
error('no format!');
end
elseif isequal(size(format),[1,2])||isequal(size(format),[2,1])
cols = format(2);rows = format(1);
else
error('第二参数输入有误！');
end


point = fopen(yuvfilename,'r');
if point == -1
error('打开文件失败！');
end

order_num = init2last(1);
frames_num = init2last(2) - order_num + 1;
k = 0;
Y = zeros(rows,cols,frames_num);
U = zeros(rows/2,cols/2,frames_num);
V = U;

offset = order_num*(rows*cols + rows*cols/2);
status = fseek(point,offset,'bof');
pro = fread(point,1,'uchar');
if (isempty(pro)&&feof(point)) || status ~=0
error('读取位置定位失败！');
end
fseek(point,-1,'cof');

for ii = 1:frames_num
k = k + 1;
pro = fread(point,1,'uchar');
if feof(point)&&isempty(pro)
disp('读取帧数范围已超过yuv视频总帧数！');
Y = Y(:,:,1:k-1);
U = U(:,:,1:k-1);
V = V(:,:,1:k-1);
break;
end
fseek(point,-1,'cof');
temp = fread(point,[cols,rows],'uchar');
Y(:,:,ii) = temp';
temp = fread(point,[cols/2,rows/2],'uchar');
U(:,:,ii) = temp';
temp = fread(point,[cols/2,rows/2],'uchar');
V(:,:,ii) = temp';
end

fclose(point);

end



for i=1:30

[Y,U,V]=ReadMultiFrames('.\mobile_cif_300f.yuv','cif',[1,30]);
U=imresize(U,2);
V=imresize(V,2);
B=2.032*U+Y;
R=1.140*V+Y;
G=Y-0.394*U-0.581*V;
B=mat2gray(B);
R=mat2gray(R);
G=mat2gray(G);
f=cat(3,R,G,B);
%imshow(f);


imwrite(f,[num2str(i), '.jpg'],'.jpg');
end

[p1594814]

for i=0:29 [Y,U,V]=ReadMultiFrames('.\mobile_cif_300f.yuv','cif',[i,i]); U=imresize(U,2); V=imresize(V,2); B=2.032*U+Y; R=1.140*V+Y; G=Y-0.394*U-0.581*V; B=mat2gray(B); R=mat2gray(R); G=mat2gray(G); f=cat(3,R,G,B); imwrite(f,strcat(num2str(i+1), '.jpg'),'jpg'); end str='H:\MATLAB\05\'; for i=1:30 img2=imread([str,num2str(i),'.jpg']); end R=f(:,:,1); G=f(:,:,2); B=f(:,:,3); Y = 0.299*R + 0.587*G + 0.114*B; for i=1:29 img3=Y(i+1)-Y(i); img3=mat2gray(img3); imwrite(img3,strcat(num2str(i+1),'.bmp'),'bmp'); end