Find coordinate of non zero element in image .

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Alina tom
Alina tom 2018-5-24
评论： KSSV 2018-5-24
I have a binary Image . and I want to get the coordinates(x1,y1) for first non zero element and coordinates of last non zero element (x1,y2) from each column of the image . and then want to plot them . can any one help me.

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回答（1 个）

KSSV
KSSV 2018-5-24
编辑：KSSV 2018-5-24
I = imread('assd.jpg') ;
% I = imcrop(I) ;
I1 = rgb2gray(I) ;
[y,x] = find(I) ;
imshow(I1)
hold on
plot(x,y,'.r')
YOu may have to crop the image, if you want to remove the unnecessary white background around the image.
  2 个评论
Alina tom
Alina tom 2018-5-24
Sir I want to get the coordinates of 1st and last non zero elements from each column .
KSSV
KSSV 2018-5-24
I = imread('image.jpg') ;
I = imcrop(I) ;
I1 = rgb2gray(I) ;
[m,n] = size(I1) ;
hold on
for i = 1:m
[y,x] = find(I1(i,:)) ;
if ~isempty(x)
plot(x(1),i,'.r') ;
plot(x(end),i,'*b') ;
end
end

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