# Calculating the Minimum and The Maximum of a Slidig Window

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Royi Avital 2014 年 4 月 23 日

Hello,
How would you create the fastest implementation to extract the Minimum and the Maximum of a Local Sliding Window over an image?
So far I used this:
localMaxImage = colfilt(inputImage, [winLength winLength], 'sliding', @max);
localMinImage = colfilt(inputImage, [winLength winLength], 'sliding', @min);
Yet it is really slow. I know I can use `imerode` and `imdilate`, Yet I'm looking for a toolbox free implementation. Thank You.
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Royi Avital 2014 年 9 月 8 日
Well, I guess as you see, I don't remember getting the right answer. You may look at my profile in StackExchange, I accept more than 80% of answers.
Anyhow, When I try answering someone, I never look at that. We're not trying to get scored, we're trying to assist people and build well organized information source.

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### 採用された回答

Matt J 2014 年 9 月 11 日
I've never used it, but this FEX contribution is MEX-driven, and so should be fast

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### その他の回答 (1 件)

Anand 2014 年 9 月 11 日
What do you mean toolbox-free? colfilt is also from the Image Processing Toolbox. Can you use ordfilt2
localMaxImage = ordfilt2(inputImage, winLength^2, true(winLength));
localMinImage = ordfilt2(inputImage, 1 , true(winLength));
This should be faster than colfilt, but maybe you can't use it.
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Royi Avital 2014 年 9 月 11 日
I think it is also from the image toolbox.

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