Hello, Could any one help me differentiate between these two pictures of currencies?

I want a way of getting a feature that could differentiate between different currencies like the these two currencies.

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Answer 1

[Image Analyst]

How about just convert to grayscale, threshold, and look at the area fraction of white pixels? It will probably be very different for the two notes.

[Mennat Allah Elsenousy]

Could you give me example of whats meant by the "area fraction" if you please?

Thank You so much

[Image Analyst]

grayImage = rgb2gray(rgbImage);
threshold = grayThresh(grayImage);
binaryImage = im2bw(grayImage, threshold);
areaFraction = sum(binaryImage) / numel(binaryImage);

[Mennat Allah Elsenousy]

Ok great, thanks :)