Title:
MULTI-STROBO FLASH PHOTOMETRY SYSTEM
Document Type and Number:
Japanese Patent JP3173832
Kind Code:
B2
Abstract:
PURPOSE: To reduce number of times of strobo flash by implementing correction processing with an optimum coefficient decided based on a video signal level (photometry information level) so as to attain exposure control with high accuracy.
CONSTITUTION: When preliminary flash for photometry is implemented for lots of number of times, the level is converged to a proper exposure level but the capacitance of a main capacitor has a limit, required power for strobo flash cannot be obtained at the actual photographing so long as the photometry flash is not decreased. In order to set a video signal to an object proper level, the strobo flash luminous quantity is decided so as to correct a difference between photometry information M obtained by preliminary flash and an object proper level to attain dimmering. In order to correct the level of the photometry information M to the proper level, when the predetermined correction allowable range is set, a multiplier section 6 multiplies a prescribed coefficient G with picture data stored in the picture memory 5 and the video signal to be sent to a digital process section 7 is set to the optimum level.
Inventors:
Shihashi Daikichi
Application Number:
JP33139691A
Publication Date:
June 04, 2001
Filing Date:
November 20, 1991
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
H04N5/238; (IPC1-7): H04N5/238
Domestic Patent References:
| JP63220230A | ||||
| JP3186088A | ||||
| JP63284985A | ||||
| JP6054574A |
Attorney, Agent or Firm:
Masahiro Fukuyama