A Digitizing System for 525 Line, 60 Hz, Monochrome Television.
Abstract
A description is given of a video processing system which is capable of digitizing 525 line, 60 Hz, 2:1 interlace, monochrome television. The system digitizes an area of the TV frame which is programmable in size and position from a programmable number of frames. This is achieved by first recording the data interval to be digitized onto an analog video disc recorder and then digitizing from the disc in a piecemeal manner. A 10 MHz sampling reference is used, allowing a maximum of 524 samples per horizontal TV line with each sample being resolved to a 6-bit binary word. Digital values are assigned according to picture brightness at a given sampling point in the raster with reference black being 0 and reference white being 63. Digital output is recorded on seven-track magnetic tape. Normal input to the system is from a video tape recorder, although the system will accept 525 line standard video from any source. For video tape recorder data, time base correction is provided. IRIG time is included with the digital output using the vertical interval encoding technique. The system offers the advantages of good versatility and high processing speed, although positional repeatability is limited to + or - 1/2 cycle of the reference oscillator. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1976
- Accession Number
- ADA027298
Entities
People
- Donald C. Anderson
Organizations
- Air Force Research Laboratory