Title:
カラー撮像装置
Document Type and Number:
Japanese Patent JP3617857
Kind Code:
B2
Abstract:
A plurality of shutter times are set to an image pickup device and an image is taken in a way to separate an incident light amount range into a low and a high luminance and, through the signal processing, it is possible to take an image over a wider dark to bright light amount range and, in particular, obtain a better color reproduction over a wider luminance range. In the case where an (R-Y) signal and (B-Y) signal are processed with a low-speed and high-speed shutter signal obtained and the high-speed shutter signal is subjected to logarithmic conversion and a bias signal is applied to provide a continuity with the low-speed shutter signal, processing is performed on a comparing section, characteristic conversion section and calculating section so that a greater one of the (R-Y) and (B-Y) signals is subjected to logarithmic conversion and the other signal is subjected to characteristic conversion in accordance with a value corresponding to a conversion ratio (591 to 503). Further, in the case where a bias voltage is applied to the greater color difference signal, a bias voltage is found in accordance with a ratio of the greater color difference signal and smaller color difference signal and applied to the other smaller color difference signal (511 to 515).
Inventors:
Sato Itou
Kazushige Oi
Kazushige Oi
Application Number:
JP9090495A
Publication Date:
February 09, 2005
Filing Date:
April 17, 1995
Export Citation:
Assignee:
Toshiba Corporation
Toshiba Digital Media Engineering Co., Ltd.
Toshiba Digital Media Engineering Co., Ltd.
International Classes:
H04N5/235; H04N9/04; (IPC1-7): H04N9/04
Domestic Patent References:
| JP6482881A | ||||
| JP3224368A | ||||
| JP4317279A | ||||
| JP759103A |
Attorney, Agent or Firm:
Takehiko Suzue