This forum is disabled, please visit https://forum.opencv.org
 | 1 | initial version |
You already know the focal lengths is 20mm, but you might want to compare/check calibration results.
In camera matrix the focal lengths fx,fy are expressed in pixel units. To convert focals in World units Fx, Fy you need sensor size in same units using similar triangle
Fx = fx * W /w or Fy = fy * H /h
where:
W: is the sensor width expressed in world units, let's say mmw: is the image width expressed in pixel fx: is the focal length expressed in pixel units (as is in the camera matrix )Your Sony α6000 is 6000x4000pix and sensor size is 23.5 x 15.6mm hence:
Fx = fx * W /w = 5192pix * 23.5mm / 6000pix = 20.33mm
Fy = fy * H /h = 5192pix * 15.6mm / 4000pix = 20.25mm
At the end your calibration looks good