How to find out the intersection point of the image ?. (Intersection point: Where the X and Y White lines meets)

Question

Naresh Naik 2013-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/84552-how-to-find-out-the-intersection-point-of-the-image-intersection-point-where-the-x-and-y-white

回答： deepak gogade 2014-5-13

The link for the image : http://imageshack.us/photo/my-images/401/0mbt.jpg/

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Answer 1

Amith Kamath 2013-8-19

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在 MATLAB Online 中打开

One of the many ways to do this:

I = imread('http://imageshack.us/a/img401/5148/0mbt.jpg');
J = I == 255; % note that there are many '255' valued pixels near the intersection. 
se = strel('disk',5);
K = imerode(J,se); % remove some of the unwanted noise pixels.
[x y] = find(K) %returns the x,y coordinates of the region in question.

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Naresh Naik 2013-12-10

编辑：Naresh Naik 2013-12-10

x 17235x1 double min 1 and max 1024

y 17235x1 double min 1 and max 1024

x and y are showing the 17235 horizontal line and 1 vertical line how do i know the intercept point ?

Could you make me clear ?

Naresh Naik 2013-12-10

Do we write a program such a way that virtual lines can be drawn on both the x and y white line of the above image

(<http://imageshack.us/photo/my-images/401/0mbt.jpg/>)

From that virtual line we can find out the intercept where they cross each other

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Answer 2

deepak gogade 2014-5-13

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在 MATLAB Online 中打开

i want to intersection point of curve by the .fig file

/matlabcentral/answers/uploaded_files/12588/Unti.jpg

 this is my graph fig. i want to intersection point of efficiency & unit discharge at 100 unit speed & other unit speed. so how we use matlab code finding intersection of this.