Plotting ROI

[EDIT: 20110620 16:25 CDT - reformat - WDR]

Hi

I am working with video on matlab.

I want to mention ROI(one or more) in the frames.

I get the starting and the ending macro block numbers and I make a rectangle and plot the ROI.

The problem with my code is, I am able to plot the box on the image if I have one ROI, but I am not able to mention two ROI, it gets updated to the new set:)

I want to plot two ROIs on a frame.

(I have the code I have written , can any one help em with that)

Thank you in advance.

clc;
close all;
clear all;
frames = yuv2mov('coastguard_dec.yuv',352,288,'420');
MB_map = importdata('roiOutput.dat');

PicWidthInMbs = 22;
ROI = 2;

I=vec2mat(MB_map,2);
[r1 c1]=size(frames);
disp(I);
[r c]=size(I);

for i=1:   %framenumber

for j=1:ROI  

top_left(j) = I(j,1);%+1;
bottom_right(j) = I(j,2);%+1;

fprintf('topleft=%d bottomright =%d \n',top_left(j),bottom_right(j));

      yTopLeft(j) = 
      xTopLeft(j) = 
      yBottomRight(j) = 
      xBottomRight(j) = 

      xstart(j) = xTopLeft(j)*16+1;
      ystart(j) = yTopLeft(j)*16+1;
      yend(j)   = yBottomRight(j)*16+16+1;
      xend(j)   = xBottomRight(j)*16+16+1;

      frame1 = frames(i).cdata(:,:,:);

       frame1(ystart(j),xstart(j):xend(j),:)=0;
       frame1(yend(j),xstart(j):xend(j),:)=0;
       frame1(ystart(j):yend(j),xstart(j),:)=0;
       frame1(ystart(j):yend(j),xend(j),:)=0;
       %hold on

       figure(i)
       hold on
       imshow(frame1),title(i);
       hold on

end
end

Answer 1

[Walter Roberson]

Move the line

frame1 = frames(i).cdata(:,:,:);

to be between the "for i" and "for j" loops.

[ram m]

Thank you Sir,

And how can I add up all these images(from ROI frames folder) make video file?

[Walter Roberson]

http://www.mathworks.com/help/techdoc/ref/videowriter.writevideo.html

VideoWriter is the recommended method these days, but if you have older software then you may need to use movie2avi()

[ram m]

Thank you Sir