How can I get start and finish coordinates of a line?

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Dinçer 2012-9-6

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https://ww2.mathworks.cn/matlabcentral/answers/47520-how-can-i-get-start-and-finish-coordinates-of-a-line

回答： Saili Ghavat 2016-4-18

采纳的回答： Image Analyst

HiCan we obtain both start and end point coordinates of the spline which is on the picture I have attached.

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Answer 1

Image Analyst 2012-9-6

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https://ww2.mathworks.cn/matlabcentral/answers/47520-how-can-i-get-start-and-finish-coordinates-of-a-line#answer_58079

Use bwmorph(). First use the 'Skel' option to get the skeleton of the line, then use the 'endpoints' to get the ends of the curves. You can then use find() if you want to know the (column, row) x,y coordinates of the endpoints.

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Image Analyst 2012-9-7

"First", "Last"? You didn't mention anything about that originally. If you want endpoints of each line one at a time, then you're either going to have to get binary images of one line at a time (hint: use bwlabel and ismember to get those single-curve images) or you're going to have to ask regionprops for "PixelList' and then use ismember to see which blob those endpoints belong to. Give that a try.

Dinçer 2012-9-7

first of all thank you for your previous help. I still in trouble. I attached another picture which can be more clear. I want to get coordinates of two end points of the spline shown in the picture.My purpose is close this spline by getting this end points. I called first point as a start point and second one as an end point on the picture. I have already get coordinates of the end point by using codes below. But I need to get coordinates of start point. How can I do it. Thank you very much.

The codes for getting coordinates of the end point I wrote is;

BW2 = bwmorph(I2,'skel',inf);

endPoints = bwmorph(BW2, 'endpoints');

imshow(BW2);hold on;

[rows cols] = find(endPoints);

[lowestY indexOfLowestY] = min(rows);

[highestY indexOfHighestY] = max(rows);

sonX = [cols(indexOfLowestY) cols(indexOfHighestY)];

sonY = [lowestY highestY];

plot(sonX , sonY , 'gs');

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