object detection in a binary image

Question

taher taher 2019-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/480312-object-detection-in-a-binary-image

评论： taher taher 2019-9-13

bwimage.jpg

I have converted an image to a biary image (attached). This image inlcudes some black spots that I'd like to have the x and y coordinates of each spot. For example, the attached image have 7 black spots. So I'll have 7 sets of x and y coordinates. I only want the x and y in terms of pixel. I'll convert to actual x and y myself.

Could anyone help me with that?

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KALYAN ACHARJYA 2019-9-13

What is your final objective?

taher taher 2019-9-13

Thank you for your answer.

These are some frames extracted from a video captured by a ultra high speed camera (of course the attached image is not the original frame). I'm trying to see if I can get the velocity of these spots (which are actually water droplets) somehow.

Of course, I'm not sure if I can get the velocity this way. Because I haven't figured out yet how to recognize the exact same spot in the next frame so that I can find its velocity.

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Answer 1

Matt J 2019-9-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/480312-object-detection-in-a-binary-image#answer_391793

编辑：Matt J 2019-9-13

在 MATLAB Online 中打开

>> bwimage=imbinarize(rgb2gray(imread('bwimage.jpg')));
>> locations=regionprops('table',~bwimage,'Centroid')
locations =
  7×1 table
        Centroid    
    ________________
    284.26    854.72
    376.96    328.91
    872.47    770.18
    1087.9    568.19
    1374.2    370.17
    1437.1    899.07
    1440.4     823.5