CCD imager with modified scanning circuitry for increasing verti

Details CCD imager with modified scanning circuitry for increasing verti CCD imager with modified scanning circuitry for increasing verti

1994-07-08

1995-10-17

Mancuso, Joseph

Television

Camera, system and detail

Solid-state image sensor

348317, H04N 5335

Patent

active

054595100

ABSTRACT:
A CCD imager is used in a television camera which generates signals for use with a particular television standard, such as the proposed U.S. HDTV production standard. The imager includes a light-sensitive A register which generates signal in the form of charge during an integrating interval, a B charge storage register into which the charge is transferred during a pull-down interval, and a horizontal shift register coupled to the last row of the B register, into which the charges are simultaneously coupled, and serially read. The video signals produced by the imager are subject to distortion caused by incomplete charge transfer in the pull-down interval and crosstalk noise resulting from gating the clock signals to the horizontal shift register on and off. Vertical transfer distortion is reduced by reading the horizontal lines from the horizontal shift register with reduced intervals between the active portions, which allows the pull-down interval to be increased. The increased pull-down interval allows use of a lower frequency signal for the vertical transfer clock signal. Crosstalk noise is reduced by applying the horizontal shift register clock to the horizontal shift register continuously.

REFERENCES:
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patent: 5144445 (1992-09-01), Higashitsutsumi
patent: 5264939 (1993-11-01), Chang
patent: 5287192 (1994-02-01), Iizuka
Carlos H. Sequin, "Charge Transfer Device", pp. 143-200 (1975).
K. Itakura, et al., "TP 12.3 A Multiple Frame-Interline-Transfer (M-FIT) CCD--A New Concept for Progressive Scan Camera Systems--, IEEE International Solid State Circuits Conference," (Feb. 1993).
T. Nakamura et al., "Studio CCD Camera Technology", International Broadcast Conference, Publication No. 327, (Sep. 21-Sep. 25, 1990).
M. Sugawara, et al., "TP 13.6: An Amplified MOS Imager Suited for Image Processing", IEEE International Solid-State Circuits Conference, (1994).
N. Murata, et al., "A TV Camera Based on a Single Digital Signal Processing LSI Device", 18th International Television Symposium and Exhibition, pp. 136-154 (Jun. 10-15, 1993).
T. Asaida, et al., "Digital Signal Processing Technology for Broadcast TV Cameras", Sony Business and Professional Group, pp. 442-447 (Jul. 1992).
T. Leacock, "HDTV Digital Camera Processor", Society of Motion Picture and Television Engineers, 135yh SMPTE Technical Conference, pp. 1-15 (Oct. 29-Nov. 2, 1993).

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