MATLAB read an RGB image into YUV format

1. Read in the photo

Flag definition for control output

Clc;close all;clear YES = 1; NO = 0;%yes Indicates the output of the file, please configure yuv444_out_txt = 1;   YUV444_OUT_YUV = 0;yuv422_out_txt = 0; YUV422_OUT_YUV = 0;yuv420_out_txt = 0; YUV420_OUT_YUV = 1;

filename = ' koala.jpg '; filestr = filename (1:findstr (filename, '. jpg ')-1); filepath = ['. \ ' filestr ' out\ ']mkdir (filepath ); filestr = [filepath filestr]; Rgbimg =imread (filename); figure;imshow (rgbimg);

1) The photos you read are configured by filename, where the photos must be placed in the directory. such as: filename = ' koala.jpg '

2) filename to find the starting position of the string. findstr (' koala.jpg ', '. jpg ') = 6, so you can take the filename minus the suffix name

3) Get a directory of. \ filename out\

4) Create the directory

5) filestr = Directory + file name, for subsequent data output, easy to output to. \ filename out\ directory. Here Filestr = '. \koalaout\koala '

2. Call the MATLAB function to convert RGB to YUV

yuvimg = RGB2YCBCR (rgbimg);     %%% RGB--Yuvfigure;imshow ((yuvimg));

3. Remove YUV Separately

Y,U,V Data Retention matrix storage, easy to follow the 4:2:2,4:2:0 sampling, more intuitive

[ImgHeight imgwidth Imgdim] = size (yuvimg);         %%len = Imgheight*imgwidth*imgdim;yuvimout = Zeros (1,len); Y = Yuvimg (:,:, 1);     % Y-Matrix U = yuvimg (:,:, 2);     % U Matrix V = yuvimg (:,:, 3);     % V Matrix Yvec = Reshape (yuvimg (:,:, 1) ', 1,[]); % matrix finishing rows Vector Uvec = Reshape (yuvimg (:,:, 2) ', 1,[]); Vvec = Reshape (yuvimg (:,:, 3) ', 1,[]); Yuvimout (1:3:len) = Yvec;yuvimout (2:3:len) = Uvec;yuvimout (3:3:len) = Vvec;

Note: When reshape a matrix, it is necessary to transpose the result to ensure that the matrix is organized by rows

4. Output YUV444 data to a file

%%% the output image of YUV data to. txt%if Yuv444_out_txt = = YES    filename = [filestr ' _444.txt '];    fid= fopen (filename, ' w ');        fprintf (FID, '%02x\n ', yuvimout);    Fclose (FID);    Disp (' Yuv444_out_txt YES '); else    disp (' Yuv444_out_txt NO '); end

In this example: filename = [filestr ' _444.txt '] = '. \koalaout\koala_444.txt '

%%% output image of YUV data to. yuv% four pixels: [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 v3]%% stored stream: [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 V3 ]%% mapped pixels: [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 v3]if YUV444_OUT_YUV = = YES    filename = [filestr ' _444.yuv '];    fid= fopen (filename, ' WB ');        Fwrite (fid,yuvimout, ' uint8 ');    Fclose (FID);    Disp (' Yuv444_out_yuv YES '); else    disp (' Yuv444_out_yuv NO '); end

5. Turn Yuv4:4:4 into YUYV 4:2:2 packed

%%% yuv4:4:4-->> yuyv 4:2:2% four pixels: [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 v3]%% stored bitstream: [Y0 U0] [Y1 V1] [Y2 U2] [Y3 v3]%% mapped pixels: [Y0 U0 V1] [Y1 U0 V1] [Y2 U2 V3] [Y3 U2 v3]%%%len = Imgheight*imgwidth+imgheight*imgwidth/2+imgheight*imgwidt H/2;yuv422out = zeros (1,len); yuv422sampy = Y;yuv422sampu = U (:, 1:2:size (u,2)); YUV422SAMPV = V (:, 2:2:size (V,2)); Yuv422out (1:2:len) = reshape (Yuv422sampy ', 1,[]);  %%% Note to transpose yuv422out (2:4:len) = reshape (Yuv422sampu ', 1,[]); Yuv422out (4:4:len) = reshape (YUV422SAMPV ', 1,[]);

Description

1) The 4:2:2 mode is reserved for all y,u,v that are sampled at a point of 1 columns per interval, as shown in the code.

2) Yuyv 4:2:2 packed that is, the pixel value is the mode of YU/YV alternating storage. Stored streams: [Y0 U0] [Y1 V1] [Y2 U2] [Y3 V3]

Output data to File

%%% output image yuv422 data to. txt%if Yuv422_out_txt = = YES    filename = [filestr ' _422.txt '];    fid= fopen (filename, ' w ');        fprintf (FID, '%02x\n ', yuv422out);    Fclose (FID);    Disp (' Yuv422_out_txt YES '); else    disp (' Yuv422_out_txt NO '); end% output yuyv422 to. YUV Fileif YUV422_OUT_YUV = yes< C6/>filename = [filestr ' _422yuyv.yuv '];    fid= fopen (filename, ' WB ');        Fwrite (fid,yuv422out, ' uint8 ');    Fclose (FID);    Disp (' Yuv422_out_yuv YES '); else    disp (' Yuv422_out_yuv NO '); end

6. Turn Yuv4:4:4 into YV12 4:2:0 planar

%%% yuv4:4:4-->> yuyv 4:2:0% output yuyv422 to. YUV file% first row four pixels: [Y0 U0 V0] [Y1 U1 V1] [Y2 U2 V2] [Y3 U3 v3]% second row Four pixels: [Y4 U4 V4] [Y5 U5 V5] [Y6 U6 V6] [Y7 U7 v7]% 4:2:0 sampling% first line sampled pixels: [Y0 U0   ] [Y1      ] [Y2 U2]   [Y3      ]% second row sampling Pixels: [Y4    V4] [Y5      ] [Y6    V6] [Y7]% 420yv12      Planar storage stream: [Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7] [V4 V6] [U0 u2]% mapped pixels: 
   [y0 U0 V4] [Y1 U0 V4] [Y2 U2 V6] [Y3 U2 v6]% [Y4 U0 V4] [Y5 U0 V4] [Y6 U2 V6] [Y7 U2 v6]%%%len             = imgheight*imgwidth +imgheight*imgwidth/4+imgheight*imgwidth/4;yuv420out = [];yuv420sampy = Y;yuv420sampu = U (1:2:size (U,1), 1:2:size (U,2 ): YUV420SAMPV = V (2:2:size (v,1), 1:2:size (v,2)),%%%yuv420out = [y V u]  % yuv420 yv12 formatyuv420out = [Yuv420out res Hape (Yuv420sampy ', 1,[]);    %Y Note to transpose yuv420out = [yuv420out reshape (YUV420SAMPV ', 1,[])];    %vyuv420out = [yuv420out reshape (Yuv420sampu ', 1,[])];    %u

Description

1) Yuv420sampu = U (1:2:size (u,1), 1:2:size (u,2)); From the first line of the picture, each interval of 1 lines and 1 columns per interval sample one U

2) YUV420SAMPV = V (2:2:size (v,1), 1:2:size (v,2)); From the second line of the picture, each interval of 1 lines and 1 columns per interval is sampled by a V

Data data to File

%%% output image yuv422 data to. txt%if Yuv420_out_txt = = YES    filename = [filestr ' _420.txt '];    fid= fopen (filename, ' w ');        fprintf (FID, '%02x\n ', yuv420out);    Fclose (FID);    Disp (' Yuv420_out_txt YES '); else    disp (' Yuv420_out_txt NO '); end% output yuyv420 to. YUV Fileif YUV420_OUT_YUV = yes< C6/>filename = [filestr ' _420yv12.yuv '];    fid= fopen (filename, ' WB ');        Fwrite (fid,yuv420out, ' uint8 ');    Fclose (FID);    Disp (' Yuv420_out_yuv YES '); else    disp (' Yuv420_out_yuv NO '); end

Watch the command output and wait for it to close

DISP ('---program run susseed---');d the ISP ('---Press any key to close all figure---'), System (' pause '); close all;

Open the output YUV file to view the picture

Reference

Http://www.cnblogs.com/xkfz007/archive/2012/07/31/2616806.html

Http://www.xuebuyuan.com/1541892.html

http://www.fourcc.org/yuv.php

Code Link:

Http://pan.baidu.com/s/1pLMRcmB

MATLAB read an RGB image into YUV format