Automatic exposure controller
Abstract
Abstract Translated from Japanese (57)【要約】 【目的】 ビデオカメラの自動露光補正に関し、画面の 低輝度部分を用いて逆光度合を定量化することにより、 画像内の輝度分布に応じた絞り補正量を得て、絞り制御 レベルを適応的に変化させることを可能にする。 【構成】 撮像素子3から得られる映像信号の低輝度平 均値を低輝度平均算出部で求める。逆光度合算出部12 で低輝度平均値を逆光度合に変換する。目標輝度算出部 で、逆光度合を基に目標輝度の修正を行う。撮像素子3 で検出された映像信号の平均輝度が、修正された目標輝 度になるように絞り制御部8で絞り開度を制御する。 (57) [Abstract] [Purpose] Regarding automatic exposure compensation for video cameras, by quantifying the degree of backlighting by using the low-brightness part of the screen, It is possible to adaptively change the aperture control level by obtaining the aperture correction amount according to the brightness distribution in the image. [Configuration] A low-luminance average value of a video signal obtained from the image pickup device 3 is obtained by a low-luminance average calculation unit. Backlight intensity calculation unit 12 Convert the low-brightness average value into the degree of backlight. The target brightness calculation unit corrects the target brightness based on the degree of backlight. Image sensor 3 The aperture control unit 8 controls the aperture opening so that the average luminance of the video signal detected in step 1 becomes the corrected target luminance.
Inventors
- 👤 Tsutomu Mori
- 👤 勉 森
- 👤 Makoto Fujimoto
- 👤 眞 藤本
- 👤 Yukie Goshima
- 👤 雪絵 五島
- 👤 Hiroshi Ekusa
- 👤 洋 江草
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