MATLAB: Find an object in an image by color

colorcolor segmentationdetectionimage processingImage Processing Toolbox

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

Best Answer

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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See my Image Segmentation Tutorial at my File Exchange

Basically you said you've already thresholded your image to create the binary image. so now you just call regionprops():

% Threshold this frame of the video.
binaryImage = grayImage > someThreshold;
binaryImage = bwareafilt(binaryImage, 1); % Take the largest blob ONLY to get rid of noise.
props = regionprops(binaryImage, 'Centroid');
% Now if you're on frame #k of the video
xCentroid(k) = props.Centroid(1);
yCentroid(k) = props.Centroid(2);

Best Answer

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