MATLAB: If there is an object (say a line) in an image, how to find the xy coordinates of each pixel that makes the line

imageimage processingpattern recognitionspatial coordinatestrace object in imageworld coordinatesxy coordinates

The XY coordinate values of each pixel of the red line. Such that I can trace the line. Thank you.

Best Answer

Convert to grayscale. Threshold to select the part that is not as bright -- the brightest part will be the white background. Now you can regionprops() and ask it to return PixelList . (Or you might want to consider using bwboundaries or bwtraceboundary. Or you might want to bwmorph() to extract the skeleton and then ask for those pixels...
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