Digital real-time video image processing device

Details Digital real-time video image processing device Digital real-time video image processing device

1982-02-16

1984-05-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358164, 358166, H04N 520

Patent

active

044504829

ABSTRACT:
An exemplary embodiment operates according to the principle of non-linear manipulation of the brightness distribution of video pictures by means of matching the brightness distribution (histogram) to a prescribed function F(H). An arithmetic unit with a histogram memory determines the histogram of a video image. A processing circuit is connected to the histogram memory and calculates correction values from the histogram for example during a vertical blanking interval so as to convert the current image point information into corrected image point information in accord with the prescribed function F(H), the corrected information being read into a correction memory. The image point information of a video image is supplied to the address input of the correction memory for conversion in accord with the correction values stored there.

REFERENCES:
patent: 3983320 (1976-09-01), Ketcham et al.
SPIE/OSA, vol. 74 (1976), pp. 120-125, Ketcham, D. J., "Real-Time Image Enhancement Techniques".

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