Shading correction method and apparatus therefor

Patent

Shading correction method and apparatus therefor

- 02 Sep 2004

6

TL;DR: In this article, a shading correction circuit capable of eliminating a measurement error due to the variations in measuring environment conditions in real-time is proposed to correct the aberration of picked-up video signals.

Abstract: PROBLEM TO BE SOLVED: To provide a shading correction circuit capable of eliminating a measurement error due to the variations in measuring environment conditions in real time SOLUTION: In shading correction for correcting the aberration of picked-up video signals, a luminance level average value of the video signals obtained from imaging devices is measured for each field or each frame, a luminance level average value of the next field or frame is predicted on the basis of the data of the measured luminance level average value, fluctuations from the reference luminance level average value are calculated, a shading correction signal is corrected so that the fluctuations are canceled, and shading correction is conducted in real time on the basis of the corrected shading correction signal COPYRIGHT: (C)2004,JPO&NCIPI

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