Surface roughness and gaussian filtering

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Doyinsola Oduwole 2020-6-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/552847-surface-roughness-and-gaussian-filtering

评论： Image Analyst 2021-8-23

I'm trying to measure surface roughness from an image. I want to carry out gaussian filtering and according to literature, gaussian filtering gives the waviness profile and subtracting the waviness from the primary profile would give the roughness profile.

Does imgaussfilt work in the same way? I obtained a filtered image and then going on to subtract gives me a black image.

function gauss
I = imread('/Users/doyindav/Desktop/qualitymap.bmp');
sigma = 1;
%cutoff = 0.08;
h = imgaussfilt(I,'Filtersize',sigma);
new_image = imsubtract(I,h);
montage([I,new_image])
end

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采纳的回答

Image Analyst 2020-6-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/552847-surface-roughness-and-gaussian-filtering#answer_455536

在 MATLAB Online 中打开

Your blur wasn't big enough, plus your difference values were all zero because you didn't blur it enough. This works:

% grayImage = imread('/Users/doyindav/Desktop/qualitymap.bmp');
grayImage = imread('moon.tif'); % Demo image.
subplot(1, 3, 1);
imshow(grayImage);
[blurredImage, subtractedImage] = gauss(grayImage);
subplot(1, 3, 2);
imshow(blurredImage);
subplot(1, 3, 3);
imshow(subtractedImage, []);
function [blurredImage, new_image] = gauss(grayImage)
sigma = 15;
%cutoff = 0.08;
blurredImage = imgaussfilt(grayImage,'Filtersize', sigma);
new_image = imsubtract(grayImage, blurredImage);
end