Item Details

Design and Evaluation of Controls for Drift, Video Gain, and Color Balance in Spaceborne Facsimile Cameras

by Stephen J. Katzberg ... [et al.]
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973.
Language
English
Series
NASA Technical Note
Summary
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.
Description
iii, 29 p. : ill. (1 col.) ; 27 cm.
Mode of access: Internet.
Notes
  • Prepared at Langley Research Center.
  • Cover title.
  • Bibliography: p. 16.
Series Statement
NASA technical note ; NASA TN D-7333
Logo for No Copyright - United StatesNo Copyright - United States
Technical Details

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    a| Design and evaluation of controls for drift, video gain, and color balance in spaceborne facsimile cameras c| by Stephen J. Katzberg ... [et al.].
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    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| [Springfield, Va. : b| For sale by the National Technical Information Service], c| 1973.
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    a| iii, 29 p. : b| ill. (1 col.) ; c| 27 cm.
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    a| NASA technical note ; v| NASA TN D-7333
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    a| Bibliography: p. 16.
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    a| 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.
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    a| Mode of access: Internet.
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    a| Imaging systems x| Automatic control.
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    a| Space vehicles x| Optical equipment x| Automatic control.
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    a| Burcher, Ernest E.
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    a| Rowland, Carroll W.
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    a| Kelly, W. Lane.
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    a| United States. b| National Aeronautics and Space Administration.
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    a| Langley Research Center.
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