All-pixels reading type electronic endoscope apparatus

Details All-pixels reading type electronic endoscope apparatus All-pixels reading type electronic endoscope apparatus

1997-09-11

2000-06-20

Kelley, Chris S.

Television

Special applications

With endoscope

358435, 358400, 358401, 358 75, 358450, 358409, 379100, H04N 718

Patent

active

060783532

ABSTRACT:
An all-pixels reading type electronic endoscope apparatus enables the function of controlling the quantity of light which becomes impossible of follow-up when a still picture having a good picture quality is displayed to be quickly restored by reading all the pixels. The data on all the pixels obtained by a CCD at one exposure are read while using a light chopper, and the data on the odd lines are stored in a first memory and the data on the even lines are stored in a second memory. These memories are inhibited from being written into at the point of time when they store the picture data obtained at the same exposure, and the field signals formed from the video signals are stored in third and fourth memories. When a still picture is displayed, the third and fourth memories are inhibited from being written into, while the first and second memories are released from the write-inhibit state. It is thus possible to quickly restore the light quantity control function by inputting the current luminance signal to an iris controller before the display of the still picture is stopped. In addition, if the shutter speed is raised when the stop of the light source is not in a full-open state, and the shutter speed is lowered when the stop is in a full-open state, it is possible to obtain a picture having a higher quality.

REFERENCES:
patent: 5374965 (1994-12-01), Kanno
patent: 5604530 (1997-02-01), Saito et al.
patent: 5617136 (1997-04-01), Iso et al.
patent: 5812187 (1998-09-01), Watanabe
patent: 5929900 (1999-07-01), Yamanaka et al.
patent: 6002425 (1999-12-01), Yamanaka et al.

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