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

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Overview:
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.
Questions:
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!
  4 Comments
KALYAN ACHARJYA
KALYAN ACHARJYA on 27 Aug 2019
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.

Answers (1)

Prabhan Purwar
Prabhan Purwar on 27 Aug 2019
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.
  2 Comments
Prasanna Venkatesh
Prasanna Venkatesh on 29 Aug 2019
@ 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

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