How can I measure the centroid of the object of an image and how to measure the distance from the centroid?

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Evelynn Tan 2018-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/422617-how-can-i-measure-the-centroid-of-the-object-of-an-image-and-how-to-measure-the-distance-from-the-ce

评论： Image Analyst 2018-10-31

I need to measure the centre point of a lip image and measure the distance from the centroid to some point (left side, right side, up and down) of the lip. Must I convert the image to gray image first or can I convert it into YCbCr colour space?

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Answer 1

Image Analyst 2018-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/422617-how-can-i-measure-the-centroid-of-the-object-of-an-image-and-how-to-measure-the-distance-from-the-ce#answer_340183

Try the color thresholder on the apps tab of the tool ribbon to get a mask. Then call regionprops on the mask to get the centroid. Then use sqrt() to get distances from the centroid to other locations you're interested in.

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Evelynn Tan 2018-10-10

If i want to measure multiple images, is there anyway to write a code for that?

Image Analyst 2018-10-10

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

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Answer 2

Evelynn Tan 2018-10-31

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编辑：Evelynn Tan 2018-10-31

I could not get a nice mask when I was trying on a lip image that I've cropped from a real person's photo. Is mask like this acceptable? And I'm still can not managed to get the distance from the centroid.