Info

This question is closed. Reopen it to edit or answer.

value of the pixel

1 view (last 30 days)
javeed miyandad
javeed miyandad on 26 Apr 2011
Closed: MATLAB Answer Bot on 20 Aug 2021
sir i have a edged image(img) ,i need to check a specific pixel whether it is white or black. how to check?
that is in an image of size 1024X768, i need to check(100X343)Th pixel, how to do please help in coding

Sign in to answer this question.

Answers (2)

Matt Fig
Matt Fig on 26 Apr 2011
That would depend somewhat on the datatype, and how exact you want to be in calling something black. Do you want a tolerance? What kind of image is it? I.e., if myimage is the name of your image, what does this return:
whos myimage
Walter Roberson
Walter Roberson on 26 Apr 2011
if any(img(100,343,:) ~= 0)
%it is not pure black. Might be very very dark gray, though.
else
%it is pure black
end
For a 2D binary image, you can reduce this test to
if img(100,343)
%it is white
else
%it is black
end

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!