Hi,
I have an image processing question. I will greatly appreciate you if you help me out how I can count the number of pixels in a known range of RGB values in an image in Matlab?
for example in the attached picture, how can I count the number of pixels in the leaves?
Thanks,
Mojtaba
I think that you can solve this problem by mathworks homepage.(www.mathworks.com)
On the homepage, we have a community for inquiries between users.
using "find" command you can do it, let say for CbCr color space, you can filter a range of color like this:
[r,c,v] = find(Cb>=77 & Cb=133 & Cr
clear all
close all
clc
A=imread('Bag28.jpg');
[row,col,lay] = size(A);
A1=A(:,:,1);
A2=A(:,:,2);
A3=A(:,:,3);
Leave_redpixels = row*col-sum(A1(:)==255);
Leave_greenpixels = row*col-sum(A2(:)==255);
Leave_bluepixels = row*col-sum(A3(:)==255);
subplot(2,3,1),imshow(A1), title('Red Component');
subplot(2,3,4),imhist(A1);
xlabel('Greyscale Value')
ylabel('Number of Pixels')
title([num2str(Leave_redpixels),' Red Pixels'])
subplot(2,3,2),imshow(A2), title('Green Component');
subplot(2,3,5),imhist(A2);
xlabel('Greyscale Value')
ylabel('Number of Pixels')
title([num2str(Leave_greenpixels),' Green Pixels'])
subplot(2,3,3), imshow(A3), title('Blue Component');
subplot(2,3,6),imhist(A3);
xlabel('Greyscale Value')
ylabel('Number of Pixels')
title([num2str(Leave_bluepixels),' Blue Pixels'])
I imagine that you have a range R_c = [min:max] where c is red, green and blue. Now for each image channel (R,G,B), you binarize the image such that pixels are set to one when they are within the range:
R_bin = (R >= MinG) & (R = MinG) & (R = MinB) & (R
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