Accession Number : ADA319876

Title :   'CCITT Test Documents' Digitization.

Descriptive Note : Final rept.,

Corporate Author : DELTA INFORMATION SYSTEMS INC HORSHAM PA

Personal Author(s) : Perschau, Stephen

PDF Url : ADA319876

Report Date : JUN 1993

Pagination or Media Count : 24

Abstract : The purpose of this report was to scan the "eight Consultative Communication tor International Telegraph and Telephone (CCITT) test documents" at pel densities of 200, 300, 400 and 600 pels per inch, compress the data, and store them on DOS diskettes. Eight documents were originally digitized by the French Administration, and were used in the Group 3 Facsimile algorithm selection process, completed in 1980. These images are often referred to as the "CCITT standard images." Although they were never an official standard, they have been used extensively by experimenters over the years. They were scanned at roughly 200 pels per inch, consistent with the capabilities of facsimile machines at that time. Recently there has been renewed interest in these images. Many of the inquiries for these images have been for digitized images of DOS diskette media at pel densities higher than 200 pels per inch. The NCS has been a leader in the development and promulgation of standardized imagery for facsimile. The NCS has sponsored the digitizing of documents at resolutions of 200, 240, 300, 400, and 480 lines per inch. This data has been used my many experimenters in the development of standard compression algorithms for digital facsimile.

Descriptors :   *SCANNING, *INFORMATION TRANSFER, *DATA COMPRESSION, *MAGNETIC DISKS, *FACSIMILE RECORDING SYSTEMS, TEST AND EVALUATION, ALGORITHMS, DIGITAL SYSTEMS, IMAGES, DOCUMENTS, FRANCE, COMMUNICATION AND RADIO SYSTEMS, INTERNATIONAL, TELEPHONE SYSTEMS, ANALOG TO DIGITAL CONVERTERS, ADVISORY ACTIVITIES, TELEGRAPH SYSTEMS.

Subject Categories : Electrical and Electronic Equipment
      Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE