Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-11-19
2000-09-05
Britton, Howard
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
345204, H04N 736, H04N 750
Patent
active
061154237
ABSTRACT:
A source coder exploits the spatial and temporal masking properties of a LCD flat panel display to improve perceptual quality over a limited bandwidth channel. The LCD's black matrix generates a strong noise component centered at the Nyquist frequency that masks the portion of the signal spectrum that lies near the Nyquist frequency. The sluggish response times of liquid crystals creates a temporal mask that further reduces the spatial resolution of moving objects. In response, the source coder shifts bits from masked transform coefficients to unmasked coefficients thereby improving the perceived visual quality of the reconstructed image. The image coder can also be designed to match the color depth associated with the LCD.
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patent: 5614946 (1997-03-01), Fukuoka
patent: 5909513 (1999-06-01), Liang et al.
James Larimer, "Visual Effects of the Black Matrix in Tessellated Displays," SID 95 DIGEST, 99, 1995.
"Video Coding for Low Bitrate Communication," Telecommunication Standardization Sector of International Telecommunication Union (ITU), Draft H.263, pp. 1-49, Dec. 5, 1995.
Peter Barten, "Simple Model for Spatial Frequency Masking and Contrast Discrimination," Human Vision, Visual Processing & Digital Display VI, SPIE vol. 2411, pp. 142-158, Feb., 1995.
Chen Homer H.
Shen Tsae-Pyng Janice
Vassilou Marius S.
Britton Howard
Rockwell Science Center LLC
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