Television – Bandwidth reduction system – Data rate reduction
Patent
1992-12-10
1994-11-15
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348405, 348408, H04N 7133, H04N 7137
Patent
active
053652711
ABSTRACT:
An information source encoding system in which overload noise and block noise are less recognized and quantizing overload and large quantizing distortion can reduced within an intra-frame mode encoding region even when intra-frame and inter-frame mode encoding regions coexist in an image screen. An orthogonal converter outputs conversion coefficients in a predetermined spatial frequency region. A coefficient separating unit selectively separates the conversion coefficients. With the separated coefficient from the coefficient separating unit, a power is calculated. The calculated power is compared with a predetermined threshold value by a coefficient power determining unit. A step width controller sets a quantizing step width, based on the combination of a power determining ON/OFF signal the coefficient power determining unit and an adaptive control ON/OFF signal from the encoding controller, when the coefficient power is larger than the threshold value in the intra-frame mode, and sets a quantizing step width determined by the quantization characteristic designation signal from the encoding controller in remaining cases. As a result, a combined adaptive quantization characteristic signal having a quantizing step width for combined adaptive control is output to the quantizer.
REFERENCES:
patent: 4827338 (1989-05-01), Gerard
patent: 5038209 (1991-08-01), Hang
patent: 5072295 (1991-12-01), Murakami et al.
CCITT SG XV Report R37, "Recommendation of the H-series" Aug. 1990.
Globecom 88, 31.2, pp. 998-1004, 1984 R. Plompen, et al "Motion Video Coding in CCITT SG XV The Video Source Coding".
Britton Howard W.
Mitsubitshi Denki Kabushiki Kaisha
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