Measurement of Compression of the Modified READ Code II.
Abstract
The subject project has two basic tasks as listed below. Measure Modified READ II Compression: it is generally agreed that the Modified READ II code is a prime candidate for use in Group 4 facsimile equipment. As part of Task 1, 30 computer simulation runs were performed for every combination of the following three parameters: Resolution (lines/inch) - 200, 240, 300, 400, 480; CCITT Image No. - 1, 5, 7; and Wrap Around - In, Out. Wrap Around refers to the technique where a run length is not necessarily terminated at the end of a scan line. Instead, the coding process is continuous from line to line. Delta Information Systems measured compression two different ways as listed below: 1. Compression Ratio - Total image pels/Transmitted bits, and 2. Total transmitted bits. Measure Scan Line Statistics for the Modified READ Code II: Under this task, Delta Information Systems measured the bits/line statistics for the fifteen images processed in Task 1, and CCITT Images 1, 5, 7. The statistical data includes the minimum bits/line, maximum bits/line, average bits/line, and standard deviation. Section 2 describes the wrap-around algorithm which was simulated while section 3 provides an overview of the computer program used in the simulation. Appendices A and B contain the code listings for the program to simulate the MOD READ II code with and without wrap-around respectively.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1982
- Accession Number
- ADA129034
Entities
People
- Richard Schaphorst
- Stephen Urban
Organizations
- Delta Information Systems (United States)