'rolling-ball background substraction' in matlab

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Peyman Obeidy
Peyman Obeidy 2017-10-10
编辑： raym 2022-7-22
Is there a reliable 'rolling-ball background subtraction' scripts for matlab?

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Image Analyst
Image Analyst 2017-10-10
Not exactly sure what that is, but morphological closing has been described as like a rolling ball. So to subtract that from the original image, the operation is called a bottom hat filter and is performed by the function imbothat() in the Image Processing Toolbox.
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Peyman Obeidy
Peyman Obeidy 2017-10-10
Thank you Image Analyst.
After trying different background subtraction methods, I highly recommend this function. Very nice job. http://au.mathworks.com/matlabcentral/fileexchange/40266-sauvola-local-image-thresholding#feedbacks
Sauvola method. Happy to send the rest of code, let me know if you are interested.
raym
raym 2022-7-22
编辑：raym 2022-7-22
Rolling ball background was mentioned briefly in imerode:
https://www.mathworks.com/help/images/ref/imerode.html#bu7tf5c-1
It use erode to get a background of the raw image(better pre-process using gauss smooth to minimize the effect of very low pixels). The things matters is the shape of structure element and the offset. ImageJ's Rolling ball use a non-flat ball-shaped structure element. The optional paraboloid shape may correspond to the distorted ball-shaped structure element that has inharmonious height anf radius. An extreme end is very smoothed ball that is almost a flat pad, then it become the flat strel with no offset. The role of offset is to tell us that the a more distal-localized pixel should have less impact on the background value calculation, thus to minimize this effect, a additional offset is force added to this pixel just in case it has a very low value. [In matlab case, the origin is add the highest while the margin pixel add the lowest, thus all pixel are elevated.

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