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How to do "the black top-hat transformation"

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Ashim Chakraborty
Ashim Chakraborty 2016-4-22
回答： MD AMIR SOHAIL 2019-3-6
after filtering the image i want to perform a black top hat transformation but could not find any information about it. please, any one help me .

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采纳的回答

Image Analyst
Image Analyst 2016-4-22
Perhaps you're talking about the "bottom hat filter".
IM2 = imbothat(IM,SE) performs morphological bottom-hat filtering on the grayscale or binary input image, IM, returning the filtered image, IM2. SE is a structuring element returned by the strel function. SE must be a single structuring element object, not an array containing multiple structuring element objects.

更多回答（3 个）

Pekko Tuominen
Pekko Tuominen 2017-7-3
In Matlab, the black top-hat transform is called bottom-hat and the white top-hat transform is called tophat. This should remove your confusion.
MD AMIR SOHAIL
MD AMIR SOHAIL 2019-3-6
White Top-hat Filtering: ( Original Image - Opening of original Image ) [which is imtophat() in matlab]
Black Top-hat Filtering: ( Closing of Original Image - Original Image ) [which is imbothat() in matlab ]
Jos (10584)
Jos (10584) 2016-4-22
  1 个评论
Ashim Chakraborty
Ashim Chakraborty 2016-4-22
Hi jos thank you for your comment. I tried it already but the output is appearing different. there are two different types of top hat is black and white. I am looking for the black top hat which not mentioned anywhere and the code IM2 = imtophat(IM,SE) IM2 = imtophat(IM,NHOOD) gpuarrayIM2 = imtophat(gpuarrayIM,___) giving different output.

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