Image compression system using halftoning and inverse halftoning

Details Image compression system using halftoning and inverse halftoning Image compression system using halftoning and inverse halftoning

1998-02-10

2000-10-31

Mancuso, Joseph

Image analysis

Image compression or coding

Gray level to binary coding

358456, G06K 936, G06K 946

Patent

active

061414506

ABSTRACT:
A two-layer image compression device is disclosed with a halftone circuit, an inverse halftone circuit and a quantization circuit. In this circuit, the halftone circuit converts the input gray-scale image into a binary image and rearranges the binary image output sequence to serve as a base layer of the input gray-scale image. The inverse halftone circuit recovers a predicted image from the binary image using the LMS algorithm and multi-table look-up methods. The quantization circuit then compares the input gray-scale image with the predicted image and encodes the difference between them to obtain an enhancement layer of the input gray-scale image.

REFERENCES:
patent: 5323247 (1994-06-01), Parker et al.
patent: 5363205 (1994-11-01), Shou et al.
patent: 5506699 (1996-04-01), Wong
patent: 5771338 (1998-06-01), Nhu
patent: 5790692 (1998-08-01), Price et al.
Wong, P. W. "Inverse halftoning and Kernal Estimation for Error Diffusion," IEEE Transactions on Image Processing, vol. 4, No. 4. pp. 486-498, Apr. 1995.
Ting et al, "Error Diffused Image Compression Using a Halftone-to-Gray Decoder and Predictive Pruned Tree-Structured Vector Quantization," IEEE Transactions on Image Processing, 1992.

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