how to find distance between two points in an image

2016 1 16
2 个回答
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更新时间：2018 3 29
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hello! i have an image something like this.
how to obtain the distance between the dot above i and the line in i? the image of i is attached below.
please help me with the code... thank you!
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harjeet singh
harjeet singh 2016-1-16

4 个投票

try to use this
img=imread('i2.png');
figure(1)
imshow(img)
hold on
[lab,num]=bwlabel(img);
[r,c]=find(lab==1);
[r1,c1]=find(lab==2);
D = pdist2([r c],[r1 c1],'euclidean'); % euclidean distance
[r2,c2]=find(D==min(D(:)));
point_1=[r(r2) c(r2)];
point_2=[r1(c2) c1(c2)];
plot([point_1(2) point_2(2)],[point_1(1) point_2(1)],'r')
hold off
distance=sqrt( (point_1(1)-point_2(1)).^2 + (point_1(2)-point_2(2)).^2)
distance =
42.1070

7 个评论
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sindhu c
sindhu c 2016-1-16
thank you a lot sir ! it works as expected.
Meghashree G
Meghashree G 2016-1-18
sir,if at all i want to find the position of dot of i in the above image(i.e whether the dot is towards the left/right/straight),how to find it?
Image Analyst
Image Analyst 2016-1-18
One way is to call regionprops() to get the centroids of the two blobs. The dot of the i will have a lower y value of its centroid than the body of the i.
Meghashree G
Meghashree G 2016-1-18
sir,this is what i did to get the centroids,
clc;
BW = imread('i1.png');
s = regionprops(BW,'centroid');
centroids = cat(1, s.Centroid); imshow(BW)
hold on
plot(centroids(:,1),centroids(:,2), 'b*')
hold off
Now what to do?Please help me.. i dint get the last part of your answer
Image Analyst
Image Analyst 2016-1-18
Isn't centroids a 1-D vector?
if centroids(2) < centroids(4)
% Blob #1 is the dot, so do something.
else
% Blob #2 is the dot, so do something.
end

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