Method for masking picture reinforcement signals carried within

Details Method for masking picture reinforcement signals carried within Method for masking picture reinforcement signals carried within

1989-12-21

1990-09-25

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 12, 358 37, 358141, 358166, H04N 7087

Patent

active

049597175

ABSTRACT:
A method generates a reinforcement signal for transmission in scan lines within a vertical blanking interval of a predetermined television video signal, and includes the steps of: randomizing the reinforcement signal in accordance with a predetermined key, adding the randomized signal to be within the vertical blanking interval of the video signal to produce a combined signal, and sending the combined signal through a television transmission path. In a preferred embodiment the video signal is in accordance with an aspect ratio which is greater than four to three, and the combined signal may be displayed on a conventional television display which displays an increased vertical blanking interval as horizontal dark bars at the top and bottom of the television picture and wherein the reinforcement signal within the bars is not coherent with any picture image being displayed. Within such displays, gamma correction of the reinforcement signal is useful. A method of extracting and processing the reinforcement signal and using it to enhance the quality of picture display in a predetermined fashion is also disclosed.

REFERENCES:
patent: 4551754 (1985-11-01), Meise et al.
patent: 4556906 (1985-12-01), Dischert et al.
patent: 4672425 (1987-06-01), Marie et al.
patent: 4888799 (1989-12-01), Mobley et al.

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