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Record Details

Record 54 of 51265
Real-time optical image processing techniques
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Author and Affiliation:
Liu, Hua-Kuang(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Abstract: Nonlinear real-time optical processing on spatial pulse frequency modulation has been pursued through the analysis, design, and fabrication of pulse frequency modulated halftone screens and the modification of micro-channel spatial light modulators (MSLMs). Micro-channel spatial light modulators are modified via the Fabry-Perot method to achieve the high gamma operation required for non-linear operation. Real-time nonlinear processing was performed using the halftone screen and MSLM. The experiments showed the effectiveness of the thresholding and also showed the needs of higher SBP for image processing. The Hughes LCLV has been characterized and found to yield high gamma (about 1.7) when operated in low frequency and low bias mode. Cascading of two LCLVs should also provide enough gamma for nonlinear processing. In this case, the SBP of the LCLV is sufficient but the uniformity of the LCLV needs improvement. These include image correlation, computer generation of holograms, pseudo-color image encoding for image enhancement, and associative-retrieval in neural processing. The discovery of the only known optical method for dynamic range compression of an input image in real-time by using GaAs photorefractive crystals is reported. Finally, a new architecture for non-linear multiple sensory, neural processing has been suggested.
Publication Date: Oct 31, 1988
Document ID:
19890013092
(Acquired Nov 06, 1995)
Accession Number: 89N22463
Subject Category: OPTICS
Report/Patent Number: AD-A204251, JPL-D-6027, ARO-22329.5-PH
Coverage: Final Report; Jul. 1984 - 31 Oct. 1988
Document Type: Technical Report
Publisher Information: United States
Contract/Grant/Task Num: MIPR-163-84; MIPR-142-85
Financial Sponsor: Department of Energy; United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 397p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: IMAGE PROCESSING; LIGHT MODULATION; MICROCHANNEL PLATES; OPTICAL DATA PROCESSING; PULSE FREQUENCY MODULATION; REAL TIME OPERATION; ARCHITECTURE (COMPUTERS); ASSOCIATIVE PROCESSING (COMPUTERS); COMPUTER TECHNIQUES; FABRY-PEROT INTERFEROMETERS; INFORMATION RETRIEVAL; LIQUID CRYSTALS; NEURAL NETS; NONLINEAR SYSTEMS; OPTIMIZATION; SPATIAL DISTRIBUTION; TELEVISION SYSTEMS
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