video - How to extract Y,U, and V components from a given yuv file using Matlab? Each component is used for further pixels level manipulation -

hey guys. i'm playing yuv file. have suggestion on how extract y,u,v components yuv video? found piece of program shown below. don't know part valid components want. thanks.

% function mov = loadfileyuv(filename, width, height, idxframe)  function [mov,imgrgb] = loadfileyuv(filename, width, height, idxframe) % load rgb movie [0, 255] yuv 4:2:0 file  fileid = fopen(filename, 'r');  subsamplemat = [1, 1; 1, 1]; nrframe = length(idxframe);   f = 1 : 1 : nrframe      % search fileid position     sizeframe = 1.5 * width * height;     fseek(fileid, (idxframe(f) - 1) * sizeframe, 'bof');      % read y component     buf = fread(fileid, width * height, 'uchar');     imgyuv(:, :, 1) = reshape(buf, width, height).'; % reshape reshape(x,m,n) returns m-by-n matrix                                                       %whose elements taken columnwise x.                                                        %an error results if x not have m*n elements      % read u component     buf = fread(fileid, width / 2 * height / 2, 'uchar');     imgyuv(:, :, 2) = kron(reshape(buf, width / 2, height / 2).', subsamplemat); % reshape , upsample      % read v component     buf = fread(fileid, width / 2 * height / 2, 'uchar');     imgyuv(:, :, 3) = kron(reshape(buf, width / 2, height / 2).', subsamplemat); % reshape , upsample      % normalize yuv values     % imgyuv = imgyuv / 255;      % convert yuv rgb     imgrgb = reshape(convertyuvtorgb(reshape(imgyuv, height * width, 3)), height, width, 3);     % imgrgb = ycbcr2rgb(imgyuv);     %imwrite(imgrgb,'actualbackground.bmp','bmp');     mov(f) = im2frame(imgrgb);     %   mov(f).cdata = uint8(imgrgb);     %   mov(f).colormap =  [];     %     imwrite(imgrgb,'actualbackground.bmp','bmp');      %figure, imshow(imgrgb);     %name = 'actualbackground.bmp';     %image = imread(name, 'bmp');     %figure, imshow(image); end fclose(fileid); 

not sure whether have fundamental misunderstanding yuv files, if edit function did below, have yuv components every frame in single variable called imgyuv. note may run out of memory in process, maybe don't want load frames of movie in 1 go.

function imgyuv = loadfileyuv(filename, width, height, idxframe) % load yuv data yuv 4:2:0 file  fileid = fopen(filename, 'r');  subsamplemat = [1, 1; 1, 1]; nrframe = length(idxframe);  %# preassign imgyuv. in case can't keep in ram, %# better function crashes here, rather after %# having wasted time filling memory. %# since images of class 'uint8',  %# can save on lot of memory initializing %# imgyuv zeros(width/2,height/2,3,nrframe,'uint8'); imgyuv = zeros(width/2 height/2, 3, nrframe);  f = 1 : 1 : nrframe      %# search fileid position     sizeframe = 1.5 * width * height;     fseek(fileid, (idxframe(f) - 1) * sizeframe, 'bof');      %# read y component     buf = fread(fileid, width * height, 'uchar');     imgyuv(:, :, 1, f) = reshape(buf, width, height).';       %# read u component     buf = fread(fileid, width / 2 * height / 2, 'uchar');     imgyuv(:, :, 2, f) = kron(reshape(buf, width / 2, height / 2).', subsamplemat); % reshape , upsample      % read v component     buf = fread(fileid, width / 2 * height / 2, 'uchar');     imgyuv(:, :, 3, f) = kron(reshape(buf, width / 2, height / 2).', subsamplemat); % reshape , upsample  end fclose(fileid);