opencv - Get edge co-ordinates after edge detection (Canny) -

i have been working opencv short time, , have performed canny edge detection on image, , performed dilation after further separate object (in case square) background.

my problem, identify graspable regions in 2d using algorithm requires me handle co-ordinates of points in edges. there way can use opencv co-ordinates of corners can find equation of lines forming edge of square? know size of square. problem involves 2d co-ordinate geometry, , hence need co-ordinates.

i can provide image after edge detection , dilation if need be. appreciated lot.

just offering second method - not guaranteed work.

• step 1: extract connected component , contours. can applied after canny edge detection step.
  • findcontours
• step 2: if contours approximation of square, can use bounding box directly.
  • boundingrect - if rectangles upright (not rotated)
  • minarearect - if rectangles rotated.

the reason disclaimer works on clean results, without broken edges or gaps in canny edges, etc. if need more robust way of finding rectangles, hough transform necessary.