real time image processing using matlab and stereo camera

Question

Newman 2015-7-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/230816-real-time-image-processing-using-matlab-and-stereo-camera

回答： Thomas Dutrannois 2018-6-13

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???

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Answer 1

Dima Lisin 2015-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/230816-real-time-image-processing-using-matlab-and-stereo-camera#answer_186894

Use the getsnapshot method of videoinput to acquire the frame.

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Dima Lisin 2015-7-23

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 2015-7-24

@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

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Answer 2

Thomas Dutrannois 2018-6-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/230816-real-time-image-processing-using-matlab-and-stereo-camera#answer_324499

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.