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  • 1
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    Elimination of coherent noise in a coherent light imaging system (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Coherent noise elimination in coherent light imaging systems by time averaging noise concentrations through lens rotation about optical axis
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; TROPHYSICAL JOURNAL
    Format: text
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  • 2
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    Evaluation of temporal registration of Landsat scenes (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The registration of Landsat images is important for multitemporal classification and for detecting change. Landsat data are now rectified to a ground coordinate system during preprocessing, hence scenes obtained over the same area are registered. The machine responsible for preprocessing the Landsat multispectral scanner data is the master data processor (MDP). This paper describes the rectification approach taken by the MDP, reviews the accuracy standards of the resultant product, and provides an assessment of the accuracy of the scene to scene registration of two Landsat images.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Journal of Remote Sensing; 3; Jan
    Format: text
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  • 3
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    Geometric verification (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Present LANDSAT data formats are reviewed to clarify how the geodetic location and registration capabilities were defined for P-tape products and RBV data. Since there is only one geometric model used in the master data processor, geometric location accuracy of P-tape products depends on the absolute accuracy of the model and registration accuracy is determined by the stability of the model. Due primarily to inaccuracies in data provided by the LANDSAT attitude management system, desired accuracies are obtained only by using ground control points and a correlation process. The verification of system performance with regards to geodetic location requires the capability to determine pixel positions of map points in a P-tape array. Verification of registration performance requires the capability to determine pixel positions of common points (not necessarily map points) in 2 or more P-tape arrays for a given world reference system scene. Techniques for registration verification can be more varied and automated since map data are not required. The verification of LACIE extractions is used as an example.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL Proc. of the NASA Workshop on Registration and Rectification; p 387-391
    Format: application/pdf
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  • 4
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    LACIE registration processing (1979)
    In:  Other Sources
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    Publication Date: 2016-03-08
    Description: The basic requirements for the LACIE processing system are to extract specified test sites (sample segments) from LANDSAT MSS data, and to apply geometric corrections and perform correlations to ensure registration between successive data acquisitions to within 1 pixel (root mean square). The general flow within the LACIE processing system is described with emphasis on (1) determination of line and pixel location of a search area within an MSS frame; (2) determination of the geometric correction coefficient and the application of geometric corrections; (3) edge detection; and (4) correlation by coincidence of edges.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Johnson Space Center Proc. of Tech. Sessions, Vol. 1 and 2; p 87-97
    Format: text
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  • 5
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    ERTS image boundaries (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Variations in image boundaries of ERTS multispectral scanner and return beam vidicon systems
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-65684 , X-560-71-309
    Format: application/pdf
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  • 6
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    Fourier transform representation of an ideal lens in coherent optical systems (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fourier transform of focussed diffraction pattern to describe coherent optical systems with lenses
    Keywords: PHYSICS, GENERAL
    Type: NASA-TM-X-63347 , X-521-68-292
    Format: application/pdf
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  • 7
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    Elimination of coherent noise in a coherent light imaging system (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Optical imaging systems using coherent light introduce objectionable noise into the output image plane. Dust and bubbles on and in lenses cause most of the noise in the output image. This noise usually appears as bull's-eye diffraction patterns in the image. By rotating the lens about the optical axis these diffraction patterns can be essentially eliminated. The technique does not destroy the spatial coherence of the light and permits spatial filtering of the input plane.
    Keywords: OPTICS
    Type: NASA-TM-X-70817 , X-521-70-76
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  • 8
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    Fourier transform representation of an ideal lens in coherent optical systems (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fourier transform representation by approximations of ideal lens in coherent optical systems
    Keywords: PHYSICS, GENERAL
    Type: NASA-TR-R-319
    Format: application/pdf
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  • 9
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    Noise diffraction patterns eliminated in coherent optical systems (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Lens rotation technique of noise diffraction pattern elimination spreads diffracted energy, normally concentrated over small area of image, over much larger annular area. Technique advantages include simplified lens selecting process, reduced clean room requirements, and low cost equipment requirements.
    Keywords: PHYSICAL SCIENCES
    Type: GSC-11133
    Format: application/pdf
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