Title:
【発明の名称】撮像装置の画質補正方式
Document Type and Number:
Japanese Patent JP2952488
Kind Code:
B2
Abstract:
PURPOSE:To suppress the deterioration in the picture quality by supplying a luminance signal formed by a matrix circuit forming a luminance signal from a color signal obtained by the pickup at an image pickup element to a luminance correction circuit so as to expand the intermediate brightness between the minimum and maximum brightness. CONSTITUTION:For example, a luminance signal Y as shown in figure (a) is a signal Y1 attenuated by 1/K1 at an attenuation circuit 20, and becomes a signal Y2 amplified nonlinear by a nonlinear amplifier circuit 21. Then the polarity of the signal Y2 is inverted by an inverting circuit 22 to form a signal Y3. The signal Y3 and the original luminance signal Y are added by an adder circuit 23 to form a signal Y4. Moreover, the signal Y4 and the original luminance signal Y are added by an adder circuit 24 to form a new luminance signal Yc. Thus, since a luminance signal correction circuit emphasizes intermediate brightness and the change in the brightness at a black and white levels is suppressed, the picture quality of a main object and a background is improved in the state of rear light and spot light scene.
Inventors:
IWABE KAZUNORI
KUBO NAOMOTO
TAMAYAMA HIROSHI
YANO TAKASHI
SOGA TAKASHI
KOIKE HITOSHI
KUBO NAOMOTO
TAMAYAMA HIROSHI
YANO TAKASHI
SOGA TAKASHI
KOIKE HITOSHI
Application Number:
JP27750788A
Publication Date:
September 27, 1999
Filing Date:
November 04, 1988
Export Citation:
Assignee:
FUJI SHASHIN FUIRUMU KK
International Classes:
H04N5/202; H04N5/243; H04N9/04; (IPC1-7): H04N9/04; H04N5/202; H04N5/243
Domestic Patent References:
| JP55158789A |
Attorney, Agent or Firm:
Kiyotaka Sasaki (3 outside)