detecting red color spots in real time video i.e. video is not stored on hard disk

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sandeep 2014-11-6

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评论： sandeep 2014-11-9

Hi all! my question is like this... an ultrasonic scanning probe is hovered above a metal rod to scan for defects.The scan can be seen on display connected to this probe. This scan is a colored video in which the defects are red colored. My aim to track the red colored spots in real time and generate a signal 1/0. I mean as we move the probe across the length of rod our algorithm should give a signal immediately whenever there is a red spot. the video generated by probe is 60 frame/sec. Also this video is not stored as file,we see video as we scan rod. I do not need to show the red spots ,but instead generate a signal 1 for red spot and 0 for no red spot. How can this be achieved,any idea. Thanks

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Image Analyst 2014-11-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/161607-detecting-red-color-spots-in-real-time-video-i-e-video-is-not-stored-on-hard-disk#answer_157997

track_color_in_video.zip

See my attached demo where I track green items in a video. You can change it to call getsnapshot() instead of read() so that you get a video frame.

Here's a more primitive and limited version that someone else posted: http://www.mathworks.com/matlabcentral/fileexchange/28757-tracking-red-color-objects-using-matlab

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Image Analyst 2014-11-9

在 MATLAB Online 中打开

Just use subplot

subplot(2,2,1);
imshow(firstImage);
subplot(2,2,2);
imshow(secondImage);
subplot(2,2,3);
plot(t, areaFractions);

sandeep 2014-11-9

but how to find areafractions. I am using percentage= (pixels in defect)/(total pixels in binary image).For calculating pixels i have used 'count' in for loop in try2m. But i'm not able to make the plot run, i don't know how to program... my try4.m file uses code from try2.m. I don't know how to code in try4 so that this file knows how to calculate percentage of defected pixels from file try2.m

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