Help To Crop Dilated Images

hi, how can I crop or get the ROI of the white area (the rectangle) of the image? I used imdilate then imfill.

here's the code:

%Dilation
Id = imdilate(gg1, strel('diamond', 1));
figure, imshow(Id);  title('Dilation');

%Fill
If = imfill(Id, 'holes');
figure, imshow(If); title('Fill');

Answer 1

[Walter Roberson]

bwareafilt() and then look for the blob that best matches the right aspect ratio (in the bounding box) out of what is left ?

Answer 2

[Image Analyst]

If you know it's the blob closest to the center, you can compute the distance from the centroid to the center of the image and take the one that is closest. Or adapt my attached demo to find rectangles.

[Tip Riel]

thanks sir I will try this one

Answer 3

[Dima Lisin]

I would use regionprops. It can compute many shape parameters, such as area, perimeter, eccentricity, etc. You can probably come up with a some combination of those parameters, that will let you tell the license plane from the other shapes.

[Tip Riel]

thanks sir I will try this one