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  • 1
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    Remote-Imaging Parameters (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Image resolution, image quality and data transmission rate of remote imaging systems continuously controlled by operator intervention. Set of levers allows operator to control independently frame rate, frame size and image quality in bits per pixel. System used for imaging systems in aircraft or remotely piloted vehicles.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14689 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 336
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Simplified data compressor (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Image data are compressed for transmission by simple, economical circuitry. Compressor handles data in blocks of 64 samples. Mean from previous line is subtracted, and pseudo-random sequence of positive and negative 1's multiplies samples of each block. Hadamard transform applied to blocks yields 64 transform coefficients. Each coefficient is compared with approximation to corresponding coefficient of previous line, and difference is quantized. Values are transmitted or stored. Procedure is reversed to reproduce image.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14041 , NASA Tech Briefs (ISSN 0145-319X); 3; 1; P. 28
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Autonomous rendezvous and feature detection system using TV imagery (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Algorithms and equations are used for conversion of standard television imaging system information into directly usable spatial and dimensional information. System allows utilization of spacecraft imagery system as sensor in application to operations such as deriving spacecraft steering signal, tracking, autonomous rendezvous and docking and ranging.
    Keywords: ELECTRONIC SYSTEMS
    Type: LAR-12050 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 4
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    Low-Cost Teleconference System (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Proposed video teleconferencing system displays drawings, photographs, and text for conferees. Although new system, called TELEDEMO, does not present live scenes from conference locations, it cost far less than conventional teleconference services. Widely scattered participants communiate by voice, graphics, and images over telephone lines.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-16057 , NASA Tech Briefs (ISSN 0145-319X); 9; 1; P. 61
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Compressing TV-image data (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Compressing technique calculates activity estimator for each segment of image line. Estimator is used in conjunction with allowable bits per line, N, to determine number of bits necessary to code each segment and which segments can tolerate truncation. Preprocessed line data are then passed to adaptive variable-length coder, which selects optimum transmission code. Method increases capacity of broadcast and cable television transmissions and helps reduce size of storage medium for video and digital audio recordings.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-14823 , NASA Tech Briefs (ISSN 0145-319X); 5; 3; P. 286
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Advanced imaging communication system (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Key elements of system are imaging and nonimaging sensors, data compressor/decompressor, interleaved Reed-Solomon block coder, convolutional-encoded/Viterbi-decoded telemetry channel, and Reed-Solomon decoding. Data compression provides efficient representation of sensor data, and channel coding improves reliability of data transmission.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-13545 , NASA Tech Briefs (ISSN 0145-319X); 1; 4; P. 536
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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