centroid calculation for multiple patches in an image

hello i have an experimental image having many bright patches. I want to compute the centroid of each patch. if anybody can help how to compute.

Answer 1

[Shantanu Dwivedi]

Assuming that the bright patches in your image are circular blobs, you can convert the image to black and white first and then find the centroid for each white patch using ‘regionprops’ command.

Refer to the ‘Estimate Center and Radii of Circular Objects and Plot Circles’ section of the following documentation page to get more help.

https://www.mathworks.com/help/images/ref/regionprops.html

[LM Pant]

Thanks for the reply.

However patches are not essentially circular but of more ellipitical in shape. it may be helpful.

regards

[Image Analyst]

You keep forgetting to attach your image.

regionprops() does not require circular objects/regions/patches, so ignore the part where he said "Assuming that the bright patches in your image are circular blobs".

You have to segment your image into the bright patches. Try imbinarize(). Or see my Image Segmentation Tutorial in My File Exchange.

[LM Pant]

Thanks for the suggestion

I have gone thogh the tutorial , its very informative and very useful.

Actualy I have to compute the centroid values by weighting the pixels on the basis of intersity of each pixel on each of the patch i.e. for x cordinates and for y co ordinates , can you suggest the process.

Thanks and regards

[Satyam Satyam]

@LM Pant Were you able to do it??

[Image Analyst]

@Satyam Satyam I'm sure he was. If you want a full demo, see my Image Processing Tutorial in my File Exchange:

Image Analyst's File Exchange