How to make triangle for a synthetic image in gray scale

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Tabish Raza
Tabish Raza 2013-3-18
编辑： Walter Roberson 2017-2-18
Helo me trying to make a synthetic image in gray scale with some rectangular shape and triangle but have trouble how to make triangle.

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Image Analyst
Image Analyst 2013-3-19
Try this:
rows = 240;
columns = 320;
grayImage = zeros(rows, columns, 'uint8');
xCoords = [100 200 300];
yCoords = [80 160 80];
mask = poly2mask(xCoords, yCoords, rows, columns);
grayImage(mask) = 150; % or whatever value you want.
imshow(grayImage);

更多回答（3 个）

Walter Roberson
Walter Roberson 2013-3-19
poly2roi()
Benhassine Nasser edinne
thank you very mutch
Benhassine Nasser edinne
编辑：Walter Roberson 2017-2-18
you can make this i.e
fname = uigetfile('*.*'); % gray scale image
Io = imread(fname);
I=Io;
xCoords = [200 512 512];
yCoords = [512 128 512];
mask = poly2mask(xCoords, yCoords, size(I,1), size(I,2));
I(mask) = 0;
Iresult=I;
subplot(1,3,1);imshow(Io) ;title('original image');
subplot(1,3,2);imshow(mask) ;title('triangl mask');
subplot(1,3,3);imshow(Iresult) ;title('Result image');

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