how to extract pixels value of extremity of image

hello everyone, i have an image (a) and i wanna test if the ligne (red) is red with width=2 pixels, the ligne (green) is green with width=2 pixels...

thank you

[harjeet singh]

your red is not a pure red and even red is with gradient so what you want to test

[bay rem]

thnak you but whatever the intensity of the color, how can i test it automatically?

Answer 1

[harjeet singh]

try to use this code

clear all
close all
clc

img=imread('images.jpg');
figure(1)
imshow(img)
drawnow

b=(img(:,:,1)>30 | img(:,:,2)>130 | img(:,:,3)>30);
% figure(2)
% imshow(b)

c=b(round(size(b,1)/2),:);
d=b(:,round(size(b,2)/2));
c1=double(c) - double([0 c(1:end-1)]);

[r1,c1]=find(c1==1);
right_vertical_border=(size(b,2)-max(c1)) + 1

c1=double(d) - double([0;d(1:end-1)]);
[r1,c1]=find(c1==-1);
top_upper_border=min(r1)

right_vertical_border =

       5

top_upper_border =

       5