MATLAB: How to make an auto cropping command

automated croppingimage processingImage Processing Toolbox

Please, see the two images I attach.

They are actually the same images, but the one is cropped at the middle of the imaging window. I defined a cropping window and just cropped it.

How can I have the same procedure in an automated way?

So Matlab needs to identify the imaging window and assume we put some values to automatically create a cropping window of e.g. 50% of the standoff's thickness. and another 50% of soft tissue. This can also be adjusted by the user and be able to chose his own values.

Looking forward to your valuable help.

God bless you.

Best Answer

I thought I already gave you code for this. Basically you threshold it, then call bwareafilt() to extract the largest blob. Then call regionprops() to get the bounding box. Then reassign the last element of the bounding box to be whatever height you want, then call imcrop(). Try it. Here's a start

binaryImage = bwareafilt(grayImage > 0, 1);
props = regionprops(binaryImage, 'BoundingBox');
bb = props.BoundingBox;
bb(end) = 100;  % Whatever height you want.
croppedImage = imcrop(grayImage, bb);
imshow(croppedImage);

Related Solutions

MATLAB: Creating image mask of 288 by 288 pixel from centroid location, threshold the image mask and out put summed pixel area

Not sure what "the centroid's origin" means, but it appears that you want the upper left centroid, and to take a box going 288 pixels down from that and 288 pixels over from that, regardless if other centroids are included in that cropping box. So to do that, you'd do (without any loop at all):

xmin = floor(min(xCentroids));
ymin = floor(min(yCentroids));
width  = 288;
height = 288;
croppedImage = imcrop(binaryImage, [xmin, ymin, width, height]);

that gives you the sub-image (the pixel values) of this 288x288 square of the binary image. I have no idea what you mean by "find the pixel value of this region" and why you think graythresh() may help you. There is nothing to threshold - it's already a binary image! And besides, you already have the pixel values because they're in the array croppedImage, so I don't know why you think you need any additional operations to get them.

MATLAB: How to crop bigger size of blob in binary image and count its pixel .

Not sure what you mean. You can use imcrop() if you want. You can also find the bounding boxes if you want:

props = regionprops(binaryImage, 'BoundingBox');

To crop out each one individually, do this

for k = 1 : length(props)
    thisBB = props(k).BoundingBox;
    subImage = imcrop(binaryImage, thisBB);
    figure;
    imshow(subImage);
end

This is done in my Image Processing Tutorial

Best Answer

Related Solutions

MATLAB: Creating image mask of 288 by 288 pixel from centroid location, threshold the image mask and out put summed pixel area

MATLAB: How to crop bigger size of blob in binary image and count its pixel .

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