Digital color transient improvement

Details Digital color transient improvement Digital color transient improvement

1997-01-08

1999-07-06

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348627, 348630, 348606, H04N 5208

Patent

active

059203579

ABSTRACT:
A digital color transient improvement (CTI) method and apparatus for enhancing the color sharpness of a chrominance signal by increasing the steepness of color edges without ringing. A median logic circuit (30) samples three signals A, B and C, and selects values from these three signals to provide an output signal that has steep color edges. One signal (A) is the non-processed input signal, a second signal (C) is a twice delayed input signal, and the third signal (B) is the derivative of the once delayed input signal. The present invention is ideally utilized by an SVP and requires a minimum number of instructions, but can also be implemented by a small number of gates on an ASIC or FPGA.

REFERENCES:
patent: 4758891 (1988-07-01), Hitchcock et al.
patent: 4935806 (1990-06-01), Rabii
patent: 5218438 (1993-06-01), Kim
Pekka Heinonen, et al. "FIR-Median Hybrid Filters with Predictive FIR Substructures" IEEE, vol. 36, No. 6, Jun. 1988.

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