how can i detect triangle

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Ahmad Jadoon
Ahmad Jadoon 2016-6-12
评论： Ahmad Jadoon 2016-6-13
how can i detect green colour triangle from pic

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Image Analyst
Image Analyst 2016-6-12
You can segment out that green triangle using either color or shape - your choice. I'm attaching demos for each. Feel free to adapt as needed.
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Image Analyst
Image Analyst 2016-6-13
Don't use for loops and simply vectorize it. Get rid of the size() and two for loops and simply have this:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Get pixels that are greener than they are red or blue.
Triangle = greenChannel > redChannel & greenChannel > blueChannel;

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Muhammad Usman Saleem
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Ahmad Jadoon
Ahmad Jadoon 2016-6-13
编辑：Ahmad Jadoon 2016-6-13
i use this coding but it detect square ,.. plz help how can i detect triangle using this coding
clear all
clc
Img =imread('shapes.png');
subplot(2,2,1)
imshow(Img) % RGB Image
subplot(2,2,2)
[Height Width]=size(Img(:,:,2));
for i=1:Height
for j=1:Width
if Img(i,j,1:2)<115
Triangle(i,j)=Img(i,j);
else Triangle(i,j)=256;
end end end
imshow(Triangle) % Detected Triangle

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