How to draw a line through a set of points?

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valerio auricchio
valerio auricchio 2020-11-3
评论： Rik 2021-6-10
Hi, I have an image and a set of points present in the image. These points are not aligned with each other and I would like to draw a line that intersects the points
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Rik
Rik 2020-11-3
question continued here
@Valerio: please don't open a new equivalent question.
John D'Errico
John D'Errico 2020-11-3
PLEASE DON'T ASK THE SAME QUESTION REPEATEDLY!
I've deleted my answer. since you already have answers to your last question.

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采纳的回答

Image Analyst
Image Analyst 2020-11-3
You forgot to attach your points, which would have been helpful.
Since your definition of "through" is a regression rather than to have the line connect all the points, use polyfit()
coefficients = polyfit(x, y, 1);
%xFit = x; % Option 1 : same number of points as the training set.
xFit = linspace(min(x), max(x), 2000); % Option 2 : lots of points, and not just where the training points are.
yFit = polyval(coefficients, xFit);
plot(x, y, 'r+', 'LineWidth', 2, 'Markersize', 15)
hold on;
plot(xFit, yFit, 'm-', 'LineWidth', 2)
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Image Analyst
Image Analyst 2020-11-3
编辑：Image Analyst 2020-11-3
Please attach your original image without the cyan markers on it, so I can get the points via thresholding:
mask = grayImage >= 200;
[y, x] = find(mask);
hold on
plot(x, y, 'c.');
hold off;
or else, supply me with a list of the x,y points you want to use.
And tell me the definition of the other line so I can find the angles of both of them and the acute angle between them.
valerio auricchio
valerio auricchio 2020-11-3
No it's all right i find what i nedd thanks a lott!!1

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Ameer Hamza
Ameer Hamza 2020-11-3
If you have the coordinates then you can use plot()
img; % your image
x; % x-coordinates of points
y; % y-coordinates of points
imshow(img);
hold on
plot(x, y)
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Aniket Agrawal
Aniket Agrawal 2021-6-10
how can i store that curve produced using plot(x,y) in a variable.
Rik
Rik 2021-6-10
You can store a handle to the graphics object. Is that what you mean by storing the curve?

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