Non-uniform clocking system for area imaging device

Details Non-uniform clocking system for area imaging device Non-uniform clocking system for area imaging device

1995-11-15

1998-12-29

Faile, Andrew

Television

Camera, system and detail

Solid-state image sensor

348441, H04N 5335

Patent

active

058546561

ABSTRACT:
An area imaging device comprises an area image sensor and means to adjust the vertical and horizontal clocking rate used to transfer pixels from an array of photo-sensors to a serial output of the area image sensor. The non-uniform clocking rates of the present invention reduce the amount of memory necessary to implement pan and zoom features by effectively separating image and non-image pixels during scanning. This also allows images collected in one format to be displayed on a display device designed for a second format. For each image scan, the area image sensor is divided into active, recovery, and inactive regions according to whether the pixels within the region are displayed, adjacent to displayed pixels, or neither adjacent to image pixels nor displayed, respectively. Rows of pixels are transferred to a horizontal shift register at a vertical scanning rate which is increased for rows that include no image pixels. The pixels of each row are then clocked out of the horizontal shift register at a rate that is adjusted according to the region of the area image sensor in which the pixels originated. Non-image pixels are shifted out at a high rate, while image pixels are shifted out at a rate that minimizes distortion of the image. Recovery pixels which segregate image and non-image pixels, are shifted out of the horizontal shift register at a slow rate to flush charge transfer cells of any accumulated excess charges.

REFERENCES:
patent: 4734772 (1988-03-01), Akiyama
patent: 5196939 (1993-03-01), Elabd et al.
patent: 5450129 (1995-09-01), Matoba et al.
patent: 5486859 (1996-01-01), Matsuda
patent: 5491512 (1996-02-01), Irakura et al.
patent: 5510836 (1996-04-01), Stekelenburg

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