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Find an object in an image by color

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Morpheuskibbe
Morpheuskibbe 2017-4-16
评论： Morpheuskibbe 2017-4-18
So I'm using a webcam to take a color picture of an area. In that area there is a red thing and a green thing among a bunch of other things. Basically I need to return the location of the center of the red thing and the green thing. The exact shape of the objects is not known in advance.
Basically I just need to tell matlab to find the color thing and have it give me coordinates from a color image

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Image Analyst
Image Analyst 2017-4-16
See my attached demo where I track a green thing in the video. It's a simple matter to add a check for red things.
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Image Analyst
Image Analyst 2017-4-17
stats(r).Centroid would be a 1 by 2 array with the (x,y) coordinate of the r'th centroid. To get all centroids, for all blobs, do
centroids = [stats.Centroid];
xCentroids = centroids(1:2:end);
yCentroids = centroids(2:2:end);
Morpheuskibbe
Morpheuskibbe 2017-4-18
Thanks. It works. I changed it a bit
the line: " hsv = rgb2hsv(double(img));" I just changed to "hsv = rgb2hsv(img);"
I noticed that if I did it that way then the V value was limited to the range 0-1 just like the others instead of big numbers like in your example

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