how to segment hand from an image with non uniform lighting?
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I'm trying to segment the hand from the image but due to the non uniform lighting the result come out like this
the result in uniform lighting
how to solve this problem?
采纳的回答
Image Analyst
2014-7-12
1 个投票
Just fix the lighting - it's so simple! It's almost always easier to prevent the problem than to fix it with software and that is definitely the case here.
If you don't want to get the job done in the most sensible, easy, straightforward, and best way (by fixing the illumination), then there are more complicated ways that you can do it, but you have to make some assumptions, like on the size of the hand, or its color, or on the smoothness of the background, or things like that. Some fix you make for one situation might not work for another. Like if you have that picture and then another where the hand is in front of a flesh colored screen, or a screen with a paisley background - those may all take different algorithms.
For what it's worth, I attach a background correction demo.
4 个评论
H
2014-7-14
Image Analyst
2014-7-14
It sounds like they're intentionally providing poor images for you to test the robustness of your algorithm. Do they provide an algorithm that works for all their images? If so, use that one. If not you'll have to invent your own algorithm, because we don't do complex algorithm development here, just help with syntax, error messages, program flow, etc. If you don't want to invent your own algorithm, then I suggest you use, or start with, one of the algorithms given here: http://www.visionbib.com/bibliography/contentspeople.html#Face%20Recognition,%20Detection,%20Tracking,%20Gesture%20Recognition,%20Fingerprints,%20Biometrics
H
2014-7-14
Image Analyst
2014-7-14
If you know your background is always neutral colored and your hands are not, then you can convert to hsv color space and threshold for reddish pixels. See my demo : http://www.mathworks.com/matlabcentral/fileexchange/28512-simple-color-detection-by-hue
更多回答（3 个）
Laila Kazemi
2014-7-12
0 个投票
You need adaptive threshold since the background changes. I have not yet found a good code in matlab for this. you might have to find your own algorithm and code it.
Prasad Kalane
2014-7-14
0 个投票
% Do some image illumination correction.
background = imopen(I,strel('disk',15));
I = I - backgroundbackground
I = imadjust(I);
% level = graythresh(I);
bw = im2bw(I,0.3*level);
Milion Negewo
2020-11-14
0 个投票
background = imopen(I,strel('disk',15));
I = I - backgroundbackground
I = imadjust(I);
% level = graythresh(I);
bw = im2bw(I,0.3*level);
1 个评论
Image Analyst
2020-11-14
Here is your algorithm:
I = imread('hands.png');
% Display original image.
subplot(2, 3, 1);
imshow(I);
title('Original Image');
% Convert to gray scale so we can call imopen().
I = rgb2gray(I);
% Display original image.
subplot(2, 3, 2);
imshow(I);
title('Gray Scale Image');
background = imopen(I, strel('disk',15));
% Display image.
subplot(2, 3, 3);
imshow(background);
title('Background Image');
I = mat2gray(double(I) - double(background));
I = imadjust(I);
% Display image.
subplot(2, 3, 4);
imshow(I);
title('Background Subtracted Image');
level = graythresh(I);
bw = im2bw(I, 0.3*level);
% Display image.
subplot(2, 3, 5:6);
imshow(bw);
title('Final Binary Image');
The final image doesn't look so good. I think you need to work on it some more.
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