Shading corrector for television camera

Abstract

Abstract PURPOSE:To readjust accurately and simply through the switch operation only for a pedestal shading correction, by digitally converting a corrected pedestal voltage of an output of process final stage. CONSTITUTION:In closing switches S1-S3 interlocked, the lens iris of an optical system (not shown in figure) is closed with the S2 and S3 makes a memory A8 into write state. When the iris from an output amplifier of a television camera is closed through the S1, a signal is digitized via an amplifier A1, an integration circuit A2, an amplifier A3, a sample hold circuit A4, and an A-D conversion circuit A5 and stored in a memory A6. After a signal for one screen's share is stored at a timing control circuit A7, this signal is read out and converted into an analog signal at a D-A converter A8 and applied to a mixing circuit (not shown in figure) so as to be opposite polarity with a video signal, allowing to correct the shading.

Inventors

• 👤 Masaru Ohara
• 👤 大原　勝

Bibliographic Details