X SCALE X SKEW Y PARALLAX 
TRANSFORMATION TRANSFORMATION TRANSFORMATION 
CORRECTING CORRECTING CORRECTING 
NORMAL DISTORTION DUE DISTORTION DUE MISALIGNMENT 
(NO DISTORTION) TO X SLOPE TO Y SLOPE IN Y 
LEFT 
SCANNING 
TÜBE 
RIGHT 
SCANNING 
TUBE 
Fig. 3 — Scanning pattern and method of correcting image distortion