How to calculate NCC normalized cross-correlation of RGB image. Is there is any inbuilt function for that?

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Gamal Seedahmed

I'm not sure if you did this step or not. You need to split your color image into its 3 bands: Red, Green, & Blue and match each band seperatly as a standalone gray level image. Then, you avergae the correlation factor for the 3 bands. Also you may need to convert the color image into a gray image and then carry the correlation on the gray image.

Michael Ryan MacIver

Yes, I agree with the second reccomendation of Aparna: convert the image to grayscale to use in 'normxcorr2'. Try the example on the Mathworks website:

https://www.mathworks.com/help/images/ref/normxcorr2.html

Jinan N. Shehab

you have 2 solves for this problems

1. transform RGB into gray image or

2. divided RGB image in to 3-channel R ,G and B and treatment each channel lonely