How could get the texture of a flower in a plant with stdfilt() function in MATLAB?

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Penny13
Penny13 2018-10-28
评论： Penny13 2018-10-28
Hello,
How stdfilt() should be used to get the texture of a part of an image?
For example the attached images.
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Walter Roberson
Walter Roberson 2018-10-28
Remove the background. Do a detection for bright yellow: if you find it then it must be Yufeng. Otherwise detect green, and find the mean brightness: the Yufeng is notably darker.

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Image Analyst
Image Analyst 2018-10-28
I'd use imsplit() to get the individual color channels and then call stdfilt() on each color channel individually.
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Image Analyst
Image Analyst 2018-10-28
Regions that vary a lot in gray level (complicated parts with lots of leaf edges) will have high values. Regions that are smooth will have low stddev values. Just try it and see:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
windowWidth = 15; % Whatever...
sdRed = stdfilt(recChannel, ones(windowWidth));
imshow(sdRed, []);
% Same for green and blue.

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