I have a problem with measuring the real world length of a line between two known lines with only one single image.
Please have a look at this sketch:
The following steps were realized:
- Calibrated the camera
- Detect the line end points in the image
- Undistored the points with the calibrated camera data
- Perspective correction with vanish lines
I have tried to solve this problem by rectify the image (removing projection and affine distortions) with this solution Image Rectification: Remove Projective and Affine Distortions from Rong Zhang.
But in my case, there is a missing second pair of orthognal lines (diagonals), because of the unknown length of c.
So there is my question: Is it possible to measure the real length of the line c with on single image, a calibrated camera and the known paramters (descripted in the sketch) ?