作者rkwhy (墨稳定为)
看板MATLAB
标题[求救] 有RGB的阵列资料 要如何输出影片
时间Mon Dec 4 19:40:52 2017
我要YUV的影片档能在matlab上播放
所以我将YUV的阵列转成RGB
取得RGB3个资料阵列，要如何以imshow播放?
附上程式码
function [r,g,b] = yuvRead(vid, width, height, nFrame)
fid = fopen(vid,'r');
stream = fread(fid,'*uchar');
length = 1.5 * width * height;
y = uint8(zeros(height, width, nFrame));
u = uint8(zeros(height, width, nFrame));
v = uint8(zeros(height, width, nFrame));
r = zeros(height, width, nFrame);
g = zeros(height, width, nFrame);
b = zeros(height, width, nFrame);
for iFrame = 1:nFrame
frame = stream((iFrame-1)*length+1:iFrame*length);
yImage = reshape(frame(1:width*height), width, height)';
uImage = reshape(frame(width*height+1:1.25*width*height), width/2, height/2)';
vImage = reshape(frame(1.25*width*height+1:1.5*width*height), width/2, height/2)';
y(:,:,iFrame) = uint8(yImage);
u(1:2:height-1,1:2:width-1,iFrame)=uint8(uImage);
u(1:2:height-1,2:2:width,iFrame)=uint8(uImage);
u(2:2:height,1:2:width-1,iFrame)=uint8(uImage);
u(2:2:height,2:2:width,iFrame)=uint8(uImage);
v(1:2:height-1,1:2:width-1,iFrame)=uint8(vImage);
v(1:2:height-1,2:2:width,iFrame)=uint8(vImage);
v(2:2:height,1:2:width-1,iFrame)=uint8(vImage);
v(2:2:height,2:2:width,iFrame)=uint8(vImage);
r(:,:,iFrame) = 1 *y(:,:,iFrame) + 1.4022* (v(:,:,iFrame)-128);
g(:,:,iFrame) = 1 * y(:,:,iFrame) -0.3946 *(u(:,:,iFrame)-128) -0.5806* (v(:,:,iFrame)-128);
b(:,:,iFrame)= 1 *y(:,:,iFrame) + 1.7710 * (u(:,:,iFrame)-128) ;
r(:,:,iFrame)=uint8(round(r(:,:,iFrame)));
g(:,:,iFrame)=uint8(round(g(:,:,iFrame)));
b(:,:,iFrame)=uint8(round(b(:,:,iFrame)));
end
videoSequence = 'sampleQCIF.yuv';
width = 176;
height = 144;
nFrame = 500;
[r,g,b] = yuvRead(videoSequence, width, height ,nFrame);
figure;
c = 0;
for iFrame = 1:500
imshow(r(:,:,iFrame));
title(['frame #', num2str(iFrame)]);
end
以上的资料阵列r 是有值的，但播放的影片是白色
求解
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