Television transmission system including a hybrid encoding circu

Details Television transmission system including a hybrid encoding circu Television transmission system including a hybrid encoding circu

1989-04-17

1990-07-10

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358135, 358136, H04N 7133, H04N 7137

Patent

active

049410423

ABSTRACT:
In a television transmission system each picture is subjected to a number of picture transforms for limiting the bit rate. In each picture transform the picture is partitioned into sub-pictures of a given size. The sub-picture size is different for the different picture transforms. Each sub-picture is converted into a limited number of predetermined coefficients by use of a sub-picture transform. This number is related to the sub-picture size. With the matrix of coefficients thus obtained for each picture an approximation of the original picture is made by use of an inverse transform and this approximation is subjected to one of the said forward transforms. The matrix of coefficients now obtained is subtracted from this matrix of coefficients which is obtained by subjecting the original picture to the same forward transform.

REFERENCES:
patent: 4704628 (1987-11-01), Chen
patent: 4825285 (1989-04-01), Speidel
patent: 4827338 (1989-05-01), Gerard
patent: 4849812 (1989-07-01), Borgers

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