Video Bandwidth Compression System.
Abstract
The Avionics Laboratory (AFWAL/AA) is presently pursuing the development of equipment that will provide jam resistant protection of realtime video imagery transmission. A critical component of these jam resistant data link systems is the video bandwidth compression unit, which must meet stringent constraints imposed by vehicle limitations, while maintaining sufficient image fidelity for a remote operator to effectively accomplish the mission. A two-dimensional discrete cosine transform (2D-DCT) algorithm was selected with a sub-picture block size of 8 x 8 pixels. A hardware/firmware approach was used. CMOS/SOS adders, multipliers, and A/D converter were coupled with bulk CMOS and LS-TTL digital logic to get the lowest power design. Video is sampled at 10 MHz and pipeline processed at 1 MHz. Use of an input frame grabber was disallowed so that the VBC system used a stripe technique in which samples are taken from each TV field in realtime. Hardware system test results have confirmed that the performance of the 2D-DCT algorithm is excellent (and easily implemented) with little or no artifacts at 1 to 2 bits/pixel. At 0.5 bits/pixel the picture is poor as expected.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1980
- Accession Number
- ADB052662
Entities
People
- J. F. Schanne