Browse Prior Art Database

Draft to Text Font Conversion Algorithm

IP.com Disclosure Number: IPCOM000045396D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Berkebile, HE: AUTHOR [+3]

Abstract

Significant savings in read-only memory storage requirements can be achieved if text dot images can be generated from the draft dot images by an algorithm. Wire matrix printers, for instance, having an 8-wire printhead, generally require 1344 bytes for a draft dot image table and an additional 4992 bytes for a text dot image table.

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Draft to Text Font Conversion Algorithm

Significant savings in read-only memory storage requirements can be achieved if text dot images can be generated from the draft dot images by an algorithm. Wire matrix printers, for instance, having an 8-wire printhead, generally require 1344 bytes for a draft dot image table and an additional 4992 bytes for a text dot image table.

Printers that are capable of both draft and text quality printing generally have both the draft and text wire images coresident in a read only memory. The algorithm set forth hereafter generates the text wire image from the draft wire image table, and hence it would be unnecessary to have the 4992 byte text dot image table.

The draft matrix is seven positions wide and eight positions high. The text matrix is thirteen by fifteen positions. One restriction for wire matrix printers is that horizontally, a dot cannot appear in adjacent dot positions.

The algorithm is defined by six simple rules set forth below. However, some general ground rules must be considered in applying the six algorithm rules. First, all dots in a given character matrix are analyzed from left to right and from top to bottom, and then only possible dot locations that contain a dot are analyzed. Finally, dots in the draft character image are analyzed with respect to the text matrix positions.

The figure shows an example of each of the rules set forth below. The rules are as follows.

Rule A If there is a dot four positions to the right of the current dot, add a dot two positions to the right of the

current dot.

Rule B If there is a dot...