camera - Measure real distance between two known lines with OpenCV -


i have problem measuring real world length of line between 2 known lines 1 single image.

please have @ sketch:

sketch of problem

the following steps realized:

  • calibrated camera
  • detect line end points in image
  • undistored points calibrated camera data
  • perspective correction vanish lines

i have tried solve problem rectify image (removing projection , affine distortions) solution image rectification: remove projective , affine distortions rong zhang.

but in case, there missing second pair of orthognal lines (diagonals), because of unknown length of c.

so there question: possible measure real length of line c on single image, calibrated camera , known paramters (descripted in sketch) ?


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