One shot predictor for mixed mode documents

Details One shot predictor for mixed mode documents One shot predictor for mixed mode documents

1981-08-24

1984-03-06

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358260, H04N 712

Patent

active

044357265

ABSTRACT:
A predictor bit pattern comprising selected bits of the current and previous raster scan lines and a method of predicting a plurality of bits per clock are disclosed. Generally, a predictor is used prior to the encoding of data to increase the compression. The current bit in a bit stream is compared to the predicted value and a one is output when the two values are not equal. An efficient predictor will reduce the number of ones in a bit stream, which increases the zero run lengths and increases the efficiency of a run length encoding system. The described bit pattern contains bits close to the current bit to efficiently predict text data, bits distant from the current bit to efficiently predict halftone data, and ignores a plurality of intermediate bits to reduce hardware costs. A two step process is also described to allow a plurality of bits to be predicted in parallel. A circuit for performing this process comprises a buffer for storing the previous and current line data, two registers for holding the previous and current line prediction data patterns and two PROMs for performing the two step prediction.

Affiliated with

Also associated with

Rating

One shot predictor for mixed mode documents does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with One shot predictor for mixed mode documents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and One shot predictor for mixed mode documents will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-743876