Image analysis – Histogram processing – For setting a threshold
Patent
1986-03-28
1988-10-04
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
358260, G06K 946
Patent
active
047760303
ABSTRACT:
In a two-dimensional transform coding system, the transform coefficients are ordered according to the variance of the coefficients through a frame of coefficient blocks. Quantization bits are individually assigned to maximize the reduction in quantization error with each assignment. The coefficients are grouped according to the number of quantization bits assigned thereto. To assign each bit, the reduction in quantization error of the frame of the block is computed for the coefficient having the largest variance of each group as the product of the square of the variance and the normalized change in quantization error. The normalized change in quantization error may be stored in a lookup table as a function of the type of distribution of the coefficients.
REFERENCES:
patent: 4196448 (1980-04-01), Whitehouse
patent: 4200886 (1980-04-01), Musmann
patent: 4225885 (1980-09-01), Lux
patent: 4385393 (1983-05-01), Chaure
patent: 4386366 (1983-05-01), Mori
patent: 4398217 (1983-08-01), Peters
patent: 4513426 (1985-04-01), Jayant
patent: 4581638 (1986-04-01), Chiariglione
patent: 4677479 (1987-06-01), Hatori
Anil K. Jain, "Image Data Compression: A Review," Proceedings of the IEEE, vol. 69, No. 3, Mar. 1981.
K. N. Ngan, "Adaptive Transform Coding of Video Signals," IEE Proc., vol. 129 Pt. F, No. 1, Feb. 1982.
Arun N. Netravali and John O. Limb, "Picture Coding: A Review," Proceedings of the IEEE, vol. 68, No. 3, Mar. 1980.
Paul A. Wintz, "Transform Picture Coding,"Proceedings of the IEEE, vol. 60, No. 7, Jul. 1972.
Boudreau Leo H.
GTE Laboratories Incorporated
Skinner A. Anne
LandOfFree
Block quantizer for transform 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 Block quantizer for transform coding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Block quantizer for transform coding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2160151