real time image processing using matlab and stereo camera

how do i process each frame of a video feed coming from a pair of stereo camera in matlab in real time?

I have written this code

right = videoinput('winvideo', 1, 'MJPG_640x480');
right1 = getselectedsource(right);

   right.FramesPerTrigger = 1;

    preview(right);

   left = videoinput('winvideo', 2, 'MJPG_640x480');
   left2 = getselectedsource(left);

   left.FramesPerTrigger = 1;

   preview(left);

Thsi fucntion creates two new windows and acquires video from a pair of webcam(stereo) 1 frame by frame.Now how do i do image processing on each frame??

How do i extract each frame of the real time video ,process it and then show the out put in real time in an another video?

I basically want to compute the dispairty map in real time using my disparity algorithm.

So i wud be rectifying and calibrating the images first.

this is my fucntion for rectification and disparity map for a static image/frame

   % % Read in the stereo pair of images.
  % I1 = imread('leftxy.png');
  % I2 = imread('rightxy.png');
  function [J1,J2]=calibdisp(stereoParams)
  %  Rectify the images.

 I1=imread('leftxy.png');
 I2=imread('rightxy.png');
 [J1, J2] = rectifyStereoImages(I1, I2, stereoParams);

 % Display the images before rectification.
 figure; 
 imshow(stereoAnaglyph(I1, I2), 'InitialMagnification', 50);
  title('Before Rectification');

 % Display the images after rectification.
 figure;
 imshow(stereoAnaglyph(J1, J2), 'InitialMagnification', 50);
 title('After Rectification');

how do i apply the same code for each frame of the real time video???

Answer 1

[Dima Lisin]

Use the getsnapshot method of videoinput to acquire the frame.

[Newman]

@dima lisin how do i then process the frame and than update the processed data in the live video feed

[Dima Lisin]

I am not sure exactly what you mean... Are you asking how to display the processed video? For that you should use vision.VideoPlayer or vision.DeployableVideoPlayer.

[Newman]

@dima lisin this is my code it is wrking but i am facing some problems pls see this http://in.mathworks.com/matlabcentral/answers/231004-real-time-disparity-map-in-matlab

Answer 2

[Thomas Dutrannois]

How did you do to acquire both video ? Do they come from external cameras ? I'm trying to do such a thing but i don't know how to import video's in real time from mutiple cameras.