Video signal processing method for changing a video signal displ

Details Video signal processing method for changing a video signal displ Video signal processing method for changing a video signal displ

1994-12-21

1996-01-30

Kuntz, Curtis

Television

Image signal processing circuitry specific to television

With details of static storage device

348716, 348445, 348556, H04N 5907, H04N 964

Patent

active

054884322

ABSTRACT:
The present invention concerns a processing method for a video signal coded in the form of blocks of K words, this signal being written to or read from two frame memories (FM1, FM2) each including an input port, a high speed output port and a low speed output port. According to this method, the input digital video signal is formed by sets of M' blocks with N' block containing luminance data (Y1, Y2 . . . ) and M'-N' blocks containing chrominance data (C1, C2 . . . ), the blocks containing the chrominance data (C1) are written in the first memory (FM1) and the blocks containing luminance data (Y1) are written in the second memory (FM2). Then the blocks containing the luminance data and the blocks containing the chrominance data are read simultaneously on the high speed output port of each memory, the memories being inverted at each frame, and the data eventually being processed to obtain video data in output that presents a compression ratio M/N with M>N.

REFERENCES:
patent: 4163248 (1979-07-01), Heitmann
patent: 4864402 (1989-09-01), Ebihara et al.
patent: 4942457 (1990-07-01), Keesen et al.
patent: 5005073 (1991-04-01), Rufray et al.
N. T. Z. Archiv, vol. 10, No. 9, Sep. 1988, pp. 259-265, R. Luder, "Digital Videotechnik In Der Unterhaltungselektronik--Heute Und Morgen".

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