从深度提取剪影 [英] silhouette extraction from depth

问题描述

你好我有深度图像，我想从中提取人（人）轮廓。我像这样使用像素阈值：

  for i = 1：240 
 for j = 1：320 
如果b（i，j）> 2400 || b（i，j）< 1900 
 c（i，j）= 5000; 
 else 
 c（i，j）= b（i，j）; 
结束
结束
结束
  

但还剩下一部分。有没有办法删除它？

Original_image：

Extracted_silhouette：

解决方案

根据。

Hello I have a depth image, I want to extract the person(human) silhouette from that. I used pixel thresholding like this:

for i=1:240 
  for j=1:320 
    if b(i,j)>2400 || b(i,j)<1900 
      c(i,j)=5000; 
    else 
      c(i,j)=b(i,j); 
    end 
  end
end

but there is some part left. Is there any way to remove that?

Original_image:

Extracted_silhouette:

解决方案

According to this thread depth map boundaries can be found based on the direction of estimated surface normals.
To estimate the direction of the surface normals, you can

[dzx dzy] = gradient( depth_map ); %// horizontal and vertical derivatives of depth map
n = cat( 3, dzx, dzy, ones(size(dzx)) );
n = bsxfun( @rdivide, n, sqrt( sum( n.^2, 3 ) ) ); %// normalize to unit length

A simple way would be to threshold

e = abs( n(:,:,3) ) < 1e-2;

Resulting with

A more sophisticated method of deriving silhouette from boundary can be found in this answer.

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