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

Question

Prasanna Venkatesh 2019-8-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477429-finding-the-variation-in-movement-of-particular-colour-in-series-of-image

关闭： MATLAB Answer Bot 2021-8-20

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!

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KALYAN ACHARJYA 2019-8-27

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.

Prasanna Venkatesh 2019-8-29

@ Kalyan Acharjya

Ya. Sure. I will try to do it asap.

此问题已关闭。

Answer 1

Prabhan Purwar 2019-8-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477429-finding-the-variation-in-movement-of-particular-colour-in-series-of-image#answer_389213

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.

https://www.mathworks.com/help/images/ref/imfindcircles.html?searchHighlight=imfindcircles&s_tid=doc_srchtitle (Documentation)

For a more detailed insight into the topic, please refer to Image Segmentation Tutorial and Detecting circular object blog linked below.

https://www.mathworks.com/matlabcentral/fileexchange/25157-image-segmentation-tutorial (Image Segmentation Tutorial)
·https://blogs.mathworks.com/steve/2012/09/04/detecting-circular-objects-in-images/ (Detecting circular object)

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Prasanna Venkatesh 2019-8-29

@ 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

Prabhan Purwar 2019-9-6