Image coding apparatus

Details Image coding apparatus Image coding apparatus

1992-04-24

1994-08-30

Britton, Howard W.

Television

Image signal processing circuitry specific to television

With details of static storage device

348390, 348439, 348513, H04N 701

Patent

active

053432568

ABSTRACT:
An image coding apparatus for sequentially coding an input image signal that is supplied at a predetermined frame rate at a rate that is independent of such a frame rate, thereby obtaining a coding image signal for transmission from which frames are thinned out. The apparatus comprises: a frame memory having a recording area corresponding to one frame of the input image signal to store the input image signal; a write address generator to sequentially generate write addresses in the frame memory in correspondence to the input image signal; a coder to execute a coding process by using the signal which is read out from the frame memory; a read address generator to sequentially generate read addresses in the frame memory in response to a frame change request which is generated from the coder; and a write limiter for comparing the write address and the read address, for stopping the subsequent writing operation of the frames written in the frame memory when the write address approaches the read address, and for restarting the writing operation from the head of the next frame.

REFERENCES:
patent: 4057836 (1977-11-01), Munsey
patent: 4183058 (1980-01-01), Taylor
patent: 4698676 (1987-10-01), Kubota
patent: 4924311 (1990-05-01), Ohki

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