if an satellite image contain different features like forest area,reservoir ,hill then how to count areas of forest, hill ,reservoir separately?

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ajay 2014-1-4

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评论： Image Analyst 2014-1-29

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Image Analyst 2014-1-4

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You need to do "classification". It's a whole field of image analysis, especially important in remote sensing. Look up papers and algorithms here: http://iris.usc.edu/Vision-Notes/bibliography/contentscartog.html#Cartography,%20Aerial%20Images,%20Remote%20Sensing,%20Buildings,%20Roads,%20Terrain,%20ATR. It's far too complicated to just give you a 500 line snippet of code here. You're going to have to do development of an algorithm that works with your images.

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Image Analyst 2014-1-6

在 MATLAB Online 中打开

How do you want to draw a boundary? With plot() from the boundary coordinates of the binary image of the forest? If so, do this

boundaries = bwboundaries(binaryImage);
imshow(originalImage);
title('Outlines, from bwboundaries()');
hold on;
boundaries = bwboundaries(binaryImage);
numberOfBoundaries = size(boundaries, 1);
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'g', 'LineWidth', 2);
end
hold off;

do this for any class you want the boundaries of. Do one at a time, getting a new binary image for each class. Plot boundaries in a different color for each class if you want.

ajay 2014-1-29