How to use spatial image coordinates to get image pixel values??

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BHARATH
BHARATH 2011-8-25
Dear all I am working in hyperspectral image classification. I need to collect the training samples using the displayed image. I have gone through impoly, imrect.. It gives the coordinates. It doesnt help me much...
does any one has any idea?? how to do it??
  2 个评论
Sean de Wolski
Sean de Wolski 2011-8-25
So given a rectangle or other polygon, extract the pixel values inside it?
Maria
Maria 2012-8-29
编辑：Maria 2012-8-29
Could you please help with this. Yes I want the pixel values inside a polygon of an image(colored) only.how should I do that?
This is how the polygon has been made
rgbImage = imread('100_3816.jpg');
imshow(rgbImage);
BW = roipoly;
% Mask the image.
maskedRgbImage = bsxfun(@times, rgbImage, cast(BW,class(rgbImage)));
% Display it.
imshow(maskedRgbImage);

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回答（1 个）

Chaowei Chen
Chaowei Chen 2011-8-27
You are almost there.
ROI=roipoly(img);
pixValue=img(ROI);

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