Calculating the Minimum and The Maximum of a Slidig Window

6 ビュー (過去 30 日間)
Royi Avital
Royi Avital 2014 年 4 月 23 日
回答済み: Matt J 2014 年 9 月 11 日
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.
  2 件のコメント
Royi Avital
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.



Matt J
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

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.
  1 件のコメント
Royi Avital
Royi Avital 2014 年 9 月 11 日
I think it is also from the image toolbox.


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by