清空筛选条件
清空筛选条件

how can we get coordinates of non zero pixel in 3D image

4 次查看（过去 30 天）
IKRAM jebali
IKRAM jebali 2017-2-1
编辑： Sayan Bhattacharya 2018-12-18
I have a stack of 249 images (image of the skeleton of the aorta) it appears like points in some slices and like lines in another slices. I want to get for each slice the coordinates of the non zero value in the image (my images are binary). I tried the command Find but it gives me just the coordinates and i don't know at which slice it corresponds.

请先登录，再回答此问题。

回答（2 个）

KSSV
KSSV 2017-2-1
编辑：KSSV 2017-2-1
find gives you row and col position along with the value you asked to seek. You can run a loop on each matrix and use find as
[row,col,v] = find(I(:,:,1)~=0)
Or alternatively you can try find on 3D matrix using:
[r,c,v] = ind2sub(size(I),find(I ~= 0));
Note that the above command is taken from the link: https://in.mathworks.com/matlabcentral/answers/789-using-find-in-a-3d-matrix-in-matlab
  3 个评论
显示 1更早的评论
Image Analyst
Image Analyst 2018-12-17
Of WHAT point? You have the coordinates of all the points. If you want one certain special point, you're going to have to identify it somehow so we know which one it is.
Sayan Bhattacharya
Sayan Bhattacharya 2018-12-18
编辑：Sayan Bhattacharya 2018-12-18
Image Analyst,
Like in the following figure, let's say its size is 100x100 that's rows & columns.
If we are moving lets say from 1st row to the last row in a loop can you please help me get the code for identifying the co-ordinates of that point where there is 1st non zero pixel encountered?

请先登录，再进行评论。

IKRAM jebali
IKRAM jebali 2017-2-1
编辑：KSSV 2017-2-1
Thank you for your answer. I tried these two commands but it doesn't give me what I want to get. And when I use a loop it gives no value for r,c and v (an empty scalar).
For i=1:249
[r c v]=find (I (:,:,i))
end
This is the loop I've tried.
  3 个评论
显示 1更早的评论
IKRAM jebali
IKRAM jebali 2017-2-1
this is my code skel = load_nii('CT10seg_skel.img'); skel=skel.img; for i=1:249 [x y v]=find(skel(:,:,i)==0); end
IKRAM jebali
IKRAM jebali 2017-2-1
Thank you for your answer, I think maybe the problem is with my image.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Geometric Transformation and Image Registration 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by