Hello,
I need to find the coordinates of the four corner dots of a circle grid. I already set up a blob detector that detects every blobs but I only need the corners ones.
Here is an exemple of an image that I acquire
I don't see how I can do this given that the coordinates are not (min.x, miny), (max.x, min.y) (min.x, max.y) and (max.x, max.y)
Thanks for your help
@mvuori's answer is good, but it can give bad results if the grid has an important angle (~45°) with the picture axis.
Another idea would be to get the list of the neighboring blobs for each blob (i.e. the blobs whose distance is smaller than a threshold). Then check the angles between the current blob and its neighbors (atan(dy/dx)). If there are neighbors in every direction, then it's somewhere in the middle. If its neighbors are in a half-plane, it's on the edges. If the neighbors are in a quarter plane, it is a corner blob.
The corner blobs are the ones whose distance from the corner is smallest. Calculate that for each blob, for each corner.
Asked: 2020-06-08 04:19:50 -0600
Seen: 552 times
Last updated: Jun 08 '20
Picture broken. Can you repair it?