Mixed Mode for Group 4 Facsimile Systems.
Alan R. Deutermann · 1983
Abstract : The purpose of this effort is to investigate the more advanced Mixed Mode coding technique which will be one service of Group 4 facsimile. In a mixed mode system the information printed on a page is divided into two parts - symbols (letters, numerals, punctuation, etc.) and graphics (logos, signatures, sketches, etc.). This study examines possible techniques for segmenting a document into graphic and symbol areas, and assemble a code that represents the entire document. Four segmentation techniques were selected for analysis as follows: SYMBOL REMOVAL/SCAN LINE; SYMBOL REMOVAL/LINE OF SYMBOLS; EXTENDED TELETEX; SYMBOL REMOVAL/HYBRID. These techniques were designed to differ from each other as much as possible, so as to display a wide variety of characteristics. For each technique, many minor modifications would be possible, but it is not expected that these modifications would alter the conclusions drawn from the study. (Author)