Image coding

Details Image coding Image coding

1978-09-18

1981-05-19

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 1, H04N 712

Patent

active

042688612

ABSTRACT:
Processing of digitally-coded pictures to improve perceived quality without increasing transmission channel capacity, featuring dividing the video signal into a low, middle and high frequency signals (16, 26), finely quantizing the low frequency signal (18), adding pseudo-random noise (33) to the middle frequency signal prior to quantizing (28), enhancing (36) and adding pseudo-random noise (48) prior to coarsely quantizing (50) the high frequency signal. The pseudo-random signals are subtracted (37, 52) from the respective signals at the receiver.

REFERENCES:
patent: 3035121 (1962-05-01), Schreiber
patent: 3244808 (1966-04-01), Roberts
patent: 3562420 (1971-02-01), Thompson
patent: 3679821 (1972-07-01), Schroeder
Kretzmer-Reduced Alphabet Representation of TV Signals-Conv. Rec, vol. 4, pp. 140-153, 1956.
Kimme-Synthesis of Optimal Filters for Feedback Quantization System-IEEE Trans. on Cir. Theory, pp. 405-413, 1963.
Brainard-Subjective Evaluation of PCM Noise-Feedback Coder for TV-Proc. IEEE, vol. 55 #3, Mar. 1967, pp. 346-353.
Brainard et al.-Direct Feedback Coders: Des. & Performance With TV Signals-Proc. of IEEE, vol. 57 #5, May 1969, pp. 776-786.
Schreiber-Picture Coding-Proc. IEEE, vol. 55 #3, Mar. 1967, pp. 320-330.
Roberts-PCM Television BW Reduction Using Pseudorandom Noise Thesis MIT Dept. of Elect Eng., Feb. 1961.
Roberts-Picture Coding Using Pseudo-Random Noise-IEEE Trans. Prof. GP on Info. Theory, IT 8:2, Feb. 1962, pp. 145-154.
Curlander-Image Enhancement Using Digital Adaptive Filtering Thesis MIT Dept. of E.E., Aug. 1977.

Affiliated with

Also associated with

Rating

Image coding does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image coding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image coding will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1492905