Title:
【発明の名称】撮像装置
Document Type and Number:
Japanese Patent JPH07118786
Kind Code:
B2
Abstract:
PURPOSE:To correct signal level of a main object at the center properly in backlighted shot etc. by detecting the level of an image pickup signal of the center of a picture and the signal of peripheral parts, making arithmetic processing making the two detection output signals input, and controlling amplitude of image pickup signals by the arithmetic output signal. CONSTITUTION:Output signals of an AD conversion circuit 10 are supplied to gate circuits 14, 16. Circuits 14 and 16 supply image pickup signals of the center of a picture and peripheral part to level detecting circuits 15, 17 respectively. Detecting circuits 15, 17 output average values P1 and P2 of amplitude of image pickup signals of the central part and peripheral part of the picture respectively. A mixing circuit 19 finds out an average value P0 of the whole picture making P1 and P2 input. A comparator circuit 20 compares the value P0 and a reference level VT and outputs an error signal, and a driving circuit 9 drives a diaphragm 2 by the error signal. On the other hand, values P1, P2 are supplied to an arithmetic circuit 18. The arithmetic circuit 18 has characteristic as shown in the figure, and indicates P2/P1=k. The vertical axis is output signals of the arithmetic circuit 18 and determines gain of a gain control circuit 11. Accordingly, the average level of the central part is corrected properly by giving gain of (1+k)/2 to the circuit 11.
Inventors:
Fujioka Atsushi
Atsushi Morimura
Kitamura Yoshinori
Hiroki Matsuoka
Atsushi Morimura
Kitamura Yoshinori
Hiroki Matsuoka
Application Number:
JP25140185A
Publication Date:
December 18, 1995
Filing Date:
November 08, 1985
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G03B7/28; H04N5/235; H04N5/243; (IPC1-7): H04N5/243
Domestic Patent References:
| JP60214168A | ||||
| JP6016072A |
Attorney, Agent or Firm:
Tomoyuki Takimoto