Television – Image signal processing circuitry specific to television – Dc insertion
Patent
1995-09-08
1998-01-13
Burgess, Glenton B.
Television
Image signal processing circuitry specific to television
Dc insertion
348689, 348257, 348677, H04N 516, H04N 518
Patent
active
057084823
ABSTRACT:
An image-signal clamping circuit processes image signals obtained from a solid state image sensor provided at a distal end of an electronic endoscope which do not have a direct-current component to restore a direct-current component thereof. The clamping circuit is arranged such that the restoration of a direct-current component of an image signal can be properly and stably carried out. The clamping circuit includes a sample-and-hold circuit to temporarily store an image signal, an analog-to-digital converter to output digital image signals, a device for digitally correcting the digital image data, and a digital-to-analog converter to output corrected analog image signals. The pedestal level of the corrected output analog image signal approximates a reference pedestal level.
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English Language Abstract of JP-6-46287.
Iketani Kohei
Takahashi Akihiro
Asahi Kogaku Kogyo Kabushiki Kaisha
Burgess Glenton B.
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