How to connect specified x,y coordinate points in image?

Hello everyone,

I would like to connect the specified x,y coordinates points in image.

1). First, I did find x,y points of the center of the eyes and mouth. Then I marked that points in the image.

2) I would like to connect 2 points of eyes and one mouth of each face (like Triangle). And then I wanna find the center points of that triangle points. How can I do that, please?

I attached image files (marked points in image, x,y values of center of eyes and mouth).

Someone can suggest or help me, please?

I appreciate your answer.

Thanks alot.

[Alex Zai]

Someone can suggest or help me, please?

I appreciate your answer.

Answer 1

[Matt J]

To connect the points you can use the drawpolygon() command, feeding it the known vertices of the 3 points:

drawpolygon('Position',[v1;v2;v3])

To find the triangle centers, just average the vertex coordinates together.

[Alex Zai]

Thanks for your answer. I appreciate that.

It actually worked.

Answer 2

[Image Analyst]

You can use plot():

hold on
plot([x1,x2,x3, x1], [y1,y2,y3, y1], 'y-', 'LineWidth', 3);

Make sure you tack on the first point to the end, like I did, to close the triangle, otherwise you'll just get a V.

[Alex Zai]

Thanks for your answer and suggestion.

I appreciate that.