how to extract an image and resize it?

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Kritika 2015-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/175202-how-to-extract-an-image-and-resize-it

评论： Kritika 2015-2-5

fin.fig

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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Answer 1

Image Analyst 2015-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/175202-how-to-extract-an-image-and-resize-it#answer_166993

编辑：Image Analyst 2015-2-5

在 MATLAB Online 中打开

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