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SMPTE Journal ( Volume: 106, Issue: 10, October 1997)
[ACTIVE]

Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
SMPTE J
Volume
106, No. 10, pp. 698–704
Abstract
Charge-coupled device (CCD) image sensors are capable of delivering at least 600% of linear video to the signal processor. This headroom is needed to reproduce large scene contrasts in a convincing way on displays not capable of handling them. Today's cameras have 10-bit analog-to-digital (AID) conversion in the video path, requiring some form of nonlinear analog processing like (pre-) gamma or (pre-)knee to handle these 600% signals. This weakens the well-known arguments of better accuracy and stability for these digital cameras: nonlinear circuits like knee, gamma, and white shading multipliers are not the most accurate and stable analog circuits. The move to 12-bit AID conversion in the camera allows digital video processing with sufficient dynamic range, and all nonlinear processing in the digital signal path. This also opens the way to reconsider processing, given the new possibilities of the digital domain. Examples are given in this paper. Some items that will be addressed are dynamic pixel correction, automatic skin contours, and a new digital highlight compression with improved color fidelity. The architecture of a 12-bit camera, the Philips BTS LDK20P, will be explained in the paper, together with the algorithms used.
Publication Date
1997-10-01
DOI
10.5594/J04507
ISSN
Print: 0036-1682
Link
https://doi.org/10.5594/J04507
Author(s)
Jan van RooyPhilips BTS, 4827 HG Breda, The Netherlands.
Rob VoetPhilips BTS, 4827 HG Breda, The Netherlands.
Copyright
© 1997 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • Adaptive Highlight Compression in Today's CCD Cameras [Active]
  • 1. Sandbank C. P. (ed.), Digital Television , John Wiley & Sons , 1990 , ISBN 0 471 92360 5. EXTERNAL
  • 2. van Rooy J. , “Requirements for Digital Signal Processing in Broadcast Cameras,” Symposium Record 19th International Television Symposium Montreux 1995 , pp. 212 – 218 . EXTERNAL
  • 3. Thorpe L. Takeuchi A. , “The All Digital Camcorder,” SMPTEJ. , 105 : 18 , Jan. 1996 . EXTERNAL
  • 5. Lacotte J. P. , “Towards Full Quality CCD Studio Cameras: The Last Steps,” IBC Conference, 1988 . EXTERNAL
  • 6. CIE Pub. no 15.2, 1976. EXTERNAL
  • 7. EBU Tech 3237-E, 1983. EXTERNAL
  • 8. Botte B. , “Digital Automatic Pixel Correction in New Generation CCD Broadcast Cameras,” IBC Conference, 1992 . EXTERNAL
  • 9. Hurst R. N. , “Independent Fleshtone Contours,” U.S. Patent No. 4,506,293, 1984. EXTERNAL
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Jan van Rooy and Rob Voet; Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras, SMPTE Journal ( Volume: 106, Issue: 10, October 1997); SMPTE, 1997. Available at https://doi.org/10.5594/J04507
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Jan van Rooy and Rob Voet; Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras, SMPTE Journal ( Volume: 106, Issue: 10, October 1997); SMPTE, 1997. Available at https://doi.org/10.5594/J04507

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Jan van Rooy and Rob Voet; Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras, SMPTE Journal ( Volume: 106, Issue: 10, October 1997); SMPTE, 1997. Available at https://doi.org/10.5594/J04507
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<span class="citation">Jan van Rooy and Rob Voet; <cite>Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras</cite>, SMPTE Journal ( Volume: 106, Issue: 10, October 1997); SMPTE, 1997. Available at <a href="https://doi.org/10.5594/J04507" target="_blank" rel="noopener">https://doi.org/10.5594/J04507</a></span>

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Jan van Rooy and Rob Voet; Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras, SMPTE Journal ( Volume: 106, Issue: 10, October 1997); SMPTE, 1997
doi: 10.5594/J04507
url: https://doi.org/10.5594/J04507
Snippet:
<li>
Jan van Rooy and Rob Voet; <cite id="bib-10-5594-j04507">Twelve-Bit Acquisition, the Next Step in Digital Broadcast Cameras</cite>, SMPTE Journal ( Volume: 106, Issue: 10, October 1997); SMPTE, 1997
<span class="doi">10.5594/J04507</span>
</li>

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