MATLAB Answers


Finding the variation in movement of particular colour in series of image

Asked by Prasanna Venkatesh on 24 Aug 2019 at 14:43
Latest activity Commented on by Prabhan Purwar on 6 Sep 2019 at 9:34
Camera takes a picture of top view of an object (black circular disc with colour marked center - static). Each time it takes a picture of it, I need to find the variation of displacement of the center of the object.
How to find that particular dot?
Can I find variations in micron level?
What kind of resolution of picture is needed for this requirement?
What format of picture will be easy?
Any other tips?
Thanks in advance!


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@ Kalyan Acharjya
Sorry. It might take time. May I know why picture is needed? Is it possible to do the above?
Camera takes a picture of top view of an object (black circular disc with colour marked center).
Image might help to better undestand the question.
@ Kalyan Acharjya
Ya. Sure. I will try to do it asap.

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1 Answer

Answer by Prabhan Purwar on 27 Aug 2019 at 8:37

Assumption: I am assuming the camera to be stationary and object moving.
You can make use of imfindcircles() function to detect the center of the circular object along with radius.
For a more detailed insight into the topic, please refer to Image Segmentation Tutorial and Detecting circular object blog linked below.


@ Prabhan Purwar
Thanks! But, Why would I need to find the center of circle, when it is already marked with different colour? My question is, Can I detect the motion of coloured mark in microns? What are all needed to do that.
I think 'Image segmentation' might be useful
Following is a link to coloured object detection based on spectrum selection
Please attach Image, it may help to provide you a specific solution.

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