Help with image thresholding?

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Shravanthi 2014-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/119946-help-with-image-thresholding

评论： Shravanthi 2014-3-4

I need to get a binary image of the fist (shown below).

I've tried using graythresh to get the threshold value, tried my own threshold values, used imgradient to get the edges and even used edge detection, but I can't seem to get a clear outline of the fist.

I'm using blob analysis for detecting the fist.

Can someone help me out? Really appreciate it!

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回答（1 个）

Anand 2014-3-3

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在 MATLAB Online 中打开

Try working in the HSV space. Here's what I got

I = imread('http://www.mathworks.com/matlabcentral/answers/uploaded_files/8923/gest2_7.jpg');
% Convert to HSV
I = rgb2hsv(I);
% Threshold based on hue
mask = I(:,:,1)>=0.023 & I(:,:,1)<=0.082;
% Cleanup mask
...

You'll need to play around with the thresholds some more and do some post-processing on the mask like filling holes and smoothing the boundaries.

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Image Analyst 2014-3-3

Can you get better illumination of the background, so that you don't have such a severe gradient?

Shravanthi 2014-3-4

This was the best lighting we could get in the room where we have to show the project. The background is black cardboard. Is there something else I can do?

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