Method for encoding and extended composite television signal wit

Details Method for encoding and extended composite television signal wit Method for encoding and extended composite television signal wit

1990-07-03

1993-01-26

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358167, 358164, 358142, H04N 1106, H04N 700, H04N 1100

Patent

active

051826348

ABSTRACT:
According to an aspect of the invention, the most perceivable interference patterns occuring during display of an extended television signal on a standard receiver are precompensated in an extended encoding apparatus, preferably in such a manner that an extended decoding apparatus may cancel this precompensation again. According to a further aspect of the invention, the low-frequency luminance interference patterns at the encoding end are calculated by approximation, whereafter, on the basis of this knowledge, a low-frequency portion of a luminance signal is modified in such a manner that the low-frequency brightness variations caused by this modification compensate to the best possible extent the low-frequency brightness variations caused by the crosstalk of the additional signal.

REFERENCES:
patent: 3737561 (1973-06-01), Boer
patent: 4246610 (1981-01-01), Takahashi
patent: 4811097 (1989-03-01), Ritter et al.
patent: 4918515 (1990-04-01), Faroudjn et al.

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