Interpolating finer intensity levels in dither-quantized televis

Details Interpolating finer intensity levels in dither-quantized televis Interpolating finer intensity levels in dither-quantized televis

Filed on

1990-05-23

Date issued

1993-10-12

Examiner

Groody, James J.

Patent Class

Facsimile and static presentation processing

SubClass

Static presentation processing

SubSubClass

Attribute control

Other Related Categories

358166, H04N 964, H04N 5213

Type

Patent

Status

active

Patent number

052530450

Description

ABSTRACT:
A receiver interpolates finer intensity levels in critical areas of a dither-quantized TV picture that is sent (or recorded) with very few intensity levels. This improves picture rendition and reduces the visibility of stipple dots. One embodiment, for video quantized with multiphase ordered dither, substitutes the mean of several successive frames at all picture elements that are not changing with time. Another embodiment averages spatially on the frame in areas devoid of high-resolution detail. Both versions use a simple test for activity that permits instant pel-to-pel switching between averaged samples and input samples. The two embodiments can be combined.

REFERENCES:
patent: 4642689 (1987-02-01), Demmer
patent: 4652905 (1987-03-01), Lippel
patent: 4692811 (1987-09-01), Tsuchiya et al.
patent: 4758893 (1988-07-01), Lippel
patent: 4979228 (1990-12-01), Rzeszewski
patent: 5148273 (1992-09-01), Lippel
"Accurate Restoration of Intensity Levels Into Dither-Quantized TV", Digest of Technical Papers for the Society of Information Display International Symposium, May 17-22, 1992 pp. 1-3, Bernard Lippel.
"QuanTV Television Technology," Quantico Inc., FCC Advisory Committee on Advanced Television Services, Nov. 15, 1988, pp. 1-7.
"Digital techniques promise to clarify thee television picture," A A Goldberg, Electronics, Feb. 5, 1976, pp. 94-100.

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