how to extract an image and resize it?

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Kritika
Kritika 2015-2-5
评论： Kritika 2015-2-5
I am enclosing an image. I want to extract only lena from it removing all the black boundaries and re-sizing it to 512x512 image.

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回答（1 个）

Image Analyst
Image Analyst 2015-2-5
编辑：Image Analyst 2015-2-5
Take the vertical and horizontal profiles and then use find() to find the bounding box
verticalProfile = mean(grayImage, 2);
horizontalProfile = mean(grayImage, 1);
topRow = find(verticalProfile, 1, 'first');
bottomRow = find(verticalProfile, 1, 'last');
leftColumn= find(horizontalProfile, 1, 'first');
rightColumn = find(horizontalProfile, 1, 'last');
croppedImage = grayImage(topRow:bottomRow, leftColumn:rightColumn);
[rows, columns, numberOfColorChannels] = size(croppedImage);
if rows ~= 512 || columns ~= 512
croppedImage = imresize(croppedImage, [512,512]);
end

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