Extract an x,y point to be used in a plot
I have a picture of a piece of paper. I can find some points of interest on the page. I know the size of the page in real life. I know the distance of each point the the centre point (in real world distance)
From these identified points I want to display them on a scatter plot .I will collect these points from a few images. Basically what I need to do is take the points and be able to get an x y value for them that I can use To plot.
I'm struggling for ideas on how to do this? Could some one assist with ideas on how this could be done ?
So here's what I've decided to do. On my scatter plot I set the y axis max to mat.rows/2 and the min to max *=-1.
Then for each point I can calculate an x y based on if it's in the tl,tr,bl,br sub square. Ie if it's in the top left square I can give it a - value to reflect that