How to detect percentage of a color range inside an Image?

Hello

I'm working on this coin detection project using matlab and I wanna know how to detect the color of the center of a coin.

I have these intervals that define the color I want : minvalue = [5 75 85], maxvalue = [50 255 255] and I wanna calculate the percentage of this interval inside an Image.

How can I do that? I did it using inrange with opencv but I couldn't figure it out on matlab.

Answer 1

[DGM]

Something like this:

A = imread('coloredChips.png'); % i just grabbed a picture that had some greens

imshow(A)

minvalue = [5 75 85];
maxvalue = [50 255 255];

mask = A(:,:,1)>=minvalue(1) & A(:,:,1)<=maxvalue(1) ...
    & A(:,:,2)>=minvalue(2) & A(:,:,2)<=maxvalue(2) ...
    & A(:,:,3)>=minvalue(3) & A(:,:,3)<=maxvalue(3);

imshow(mask)

% this is the fraction of the image that lies within 
% the rectangular prism defined by the two corner points
maskcoverage = mean(mask,'all')

maskcoverage = 0.0305