Accession Number : AD0771723

Title :   Computer Generation of Coherent Optical Filters with High Light Efficiency and Large Dynamic Range.

Descriptive Note : Technical rept.,

Corporate Author : STANFORD UNIV CA STANFORD ELECTRONICS LABS

Personal Author(s) : Severcan, Mate

Report Date : DEC 1973

Pagination or Media Count : 139

Abstract : Two new techniques for making computer generated spatial filters with high dynamic range and high light efficiency are described, and a general treatment of computer generated holograms is given. Examples of single-channel (continuous phase control) phase-only filters, binary phase-only filters, as well as the absorption-type filters have been realized experimentally. Experiments have been carried out for correcting blurred images and for character recognition. Finally, a ternary hologram (binary absorption and binary phase), which preserves advantages of both types of binary holograms but is capable of a higher dynamic range than either individually, has been realized experimentally using color film. (Modified author abstract)

Descriptors :   *OPTICAL IMAGES, *OPTICAL FILTERS, *DATA PROCESSING, MATCHED FILTERS, PHASE CONTROL, HOLOGRAMS, CHARACTER RECOGNITION, FOURIER TRANSFORMATION, THESES.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE