Video signal compression using 2-d ADRC of successive non-statio

Details Video signal compression using 2-d ADRC of successive non-statio Video signal compression using 2-d ADRC of successive non-statio

1991-08-16

1993-08-31

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, H04N 713

Patent

active

052413810

ABSTRACT:
An apparatus for highly efficient encoding of a digital image signal comprising frames of pixels converts the digital image signal into a blocked signal, sub-samples the blocked signal to reduce the number of pixels in each block by one-half and then performs adaptive dynamic range coding (ADRC) and frame dropping on the sub-sampled signal. The ADRC compresses the amount of pixel data in a first frame to half of a two-frame target value by subtracting the minimum value of the pixels in a block from each of pixels in the block, then representing each of the resultant pixel data values with a smaller number of bits than was originally used. This smaller number is determined based on the dynamic range of the block and the target value. A second frame following the first frame is dropped if it is detected as a stationary frame, or is compressed using ADRC to the two-frame target value reduced by the amount of data generated for the first frame if detected as a non-stationary frame.

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patent: 5008747 (1991-04-01), Carr et al.
patent: 5068726 (1991-11-01), Kondo et al.
patent: 5128759 (1992-07-01), Matsunaga
Patent Abstracts of Japan vol. 10, No. 32 (E-379) Feb. 7, 1986 & JP-A-60 189 388 (Fujitsu) Sep. 26, 1985.

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