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  • 1
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    The role of the microprocessor in onboard image processing for the information adaptive system (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The preliminary design of the Information Adaptive System is presented. The role of the microprocessor in the implementation of the individual processing elements is discussed. Particular emphasis is placed on multispectral image data processing.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA. Goddard Space Flight Center Aerospace Appl. of Microprocessors; p 37-45
    Format: application/pdf
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  • 2
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    High speed lookup table approach to radiometric calibration of multispectral image data (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A concept for performing radiometric correction of multispectral image data onboard a spacecraft at very high data rates is presented and demonstrated. This concept utilized a lookup table approach, implemented in hardware, to convert the raw sensor data into the desired corrected output data. The digital lookup table memory was interfaced to a microprocessor to allow the data correction function to be completely programmable. Sensor data was processed with this approach at rates equal to the access time of the lookup table memory. This concept offers flexible high speed data processing for a wide range of applications and will benefit from the continuing improvements in performance of digital memories.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: NASA-TP-1741 , L-13893
    Format: application/pdf
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  • 3
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    A design approach to real-time formatting of high speed multispectral image data (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A design approach to formatting multispectral image data in real time at very high data rates is presented for future onboard processing applications. The approach employs a microprocessor-based alternating buffer memory configuration whose formatting function is completely programmable. Data are read from an output buffer in the desired format by applying the proper sequence of addresses to the buffer via a lookup table memory. Sensor data can be processed using this approach at rates limited by the buffer memory access time and the buffer switching process delay time. This design offers flexible high speed data processing and benefits from continuing increases in the performance of digital memories.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA-TP-1870 , L-14454
    Format: application/pdf
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  • 4
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    Design and evaluation of controls for drift, video gain, and color balance in spaceborne facsimile cameras (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The facsimile camera is an optical-mechanical scanning device which has become an attractive candidate as an imaging system for planetary landers and rovers. This paper presents electronic techniques which permit the acquisition and reconstruction of high quality images with this device, even under varying lighting conditions. These techniques include a control for low frequency noise and drift, an automatic gain control, a pulse-duration light modulation scheme, and a relative spectral gain control. Taken together, these techniques allow the reconstruction of radiometrically accurate and properly balanced color images from facsimile camera video data. These techniques have been incorporated into a facsimile camera and reproduction system, and experimental results are presented for each technique and for the complete system.
    Keywords: ELECTRONICS
    Type: NASA-TN-D-7333 , L-8845
    Format: application/pdf
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  • 5
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    Electro-optical device for monitoring wire size (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Device recognizes variations in wire size and is being used during computer memory-plane fabrication. Decrease in wire diameter, due to stretching, permits removal of wire from memory-plant mold. Monitoring provides means of detecting imperfect wire and permits fabrication of computer memory plane to be stopped prior to its insertion into mold.
    Keywords: ELECTRONIC SYSTEMS
    Type: LAR-11358
    Format: application/pdf
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  • 6
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    Device for measuring the contour of a surface (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Light from a source is imaged by a lens onto a surface so that the energy from the source is concentrated into a spot. As the spot across the surface is scanned, the surface moves relative to the point of perfect focus. When the surface moves away from perfect focus the spot increases in size, while the total energy in the spot remains virtually constant. The lens then reimages the light reflected by the surface onto two detectors through two different sized apertures. The light energy going to the two detectors is separated by a beam splitter. This second path of the light energy through the lens further defocuses the spot, but as a result of the different sizes of the apertures in each light detector path, the amount of defocus for each is different. The ratio of the outputs of the two detectors which are indicative of the contour of the surface is obtained by a divider.
    Keywords: OPTICS
    Format: application/pdf
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  • 7
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    Solid-state turn coordinator display (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A solid state turn coordinator display which employs light emitting diodes (LED's) as the display medium was developed to demonstrate the feasibility of such displays for aircraft applications. The input to the display is supplied by a fluidic inertial rate sensor used in an aircraft wing leveler system. The display is composed of the LED radial display face and the electronics necessary to address and drive the individual lines of LED's. Three levels of brightness are provided to compensate for the different amounts of ambient light present in the cockpit.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: NASA-TM-X-72782
    Format: application/pdf
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  • 8
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    Optical profilometer (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Device, consisting of optical scanning subsystem, two light detectors with associated amolifiers, analog divider, and adjustable nonlinear function generator, directly determines surface area, absolute depth, and point-to-point distance of three-dimensional object without physical contact with surface under observation.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-11869 , NASA Tech Briefs (ISSN 0145-319X); 1; 3; P. 364
    Format: text
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  • 9
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    Analytical models and system topologies for remote multispectral data acquisition and classification (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Simple analytical models are presented of the radiometric and statistical processes that are involved in multispectral data acquisition and classification. Also presented are basic system topologies which combine remote sensing with data classification. These models and topologies offer a preliminary but systematic step towards the use of computer simulations to analyze remote multispectral data acquisition and classification systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-78795
    Format: application/pdf
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  • 10
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    LED instrument approach instruction display (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A display employing light emitting diodes (LED's) was developed to demonstrate the feasibility of such displays for presenting landing and navigation information to reduce the workload of general aviation pilots during IFR flight. The display consists of a paper tape reader, digital memory, control electronics, digital latches, and LED alphanumeric displays. A presentable digital countdown clock-timer is included as part of the system to provide a convenient means of monitoring time intervals for precise flight navigation. The system is a limited capability prototype assembled to test pilot reaction to such a device under simulated IFR operation. Pilot opinion indicates that the display is helpful in reducing the IFR pilots workload when used with a runway approach plate. However, the development of a compact, low power second generation display was recommended which could present several instructions simultaneously and provide information update capability. A microprocessor-based display could fulfill these requirements.
    Keywords: AIRCRAFT INSTRUMENTATION
    Type: NASA-TM-78823
    Format: application/pdf
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