Automatic Centering Unit for the Registration of a Three-Tube Color Television Camera

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Precise centering of the several images of a color television camera is difficult to maintain for long periods. A digital system is described which detects and corrects the centering errors from the video signals of normal scenes. In this system the video is converted to short pulses representing high-level, sharp edges of objects and the horizontal centering errors are then detected by comparing these pulses for relative time differences. Vertical errors are detected by a similar system which operates from line to line on signals recreated from the pulses by line-strobing. These signals contain vertical errors only. High-quality integrating stores are used to extract the average corrective powers from the error signals. The dc voltages thus obtained are then used to modify the appropriate centering control voltages.
Publication Date: 1972-01-01
DOI: 10.5594/J05667
Link: https://doi.org/10.5594/J05667
Author(s): A. W. Critchley

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A. W. Critchley; Automatic Centering Unit for the Registration of a Three-Tube Color Television Camera, Journal of the SMPTE ( Volume: 81, Issue: 1, January 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J05667

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A. W. Critchley; Automatic Centering Unit for the Registration of a Three-Tube Color Television Camera, Journal of the SMPTE ( Volume: 81, Issue: 1, January 1972); SMPTE, 1972. Available at https://doi.org/10.5594/J05667

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<span class="citation">A. W. Critchley; <cite>Automatic Centering Unit for the Registration of a Three-Tube Color Television Camera</cite>, Journal of the SMPTE ( Volume: 81, Issue: 1, January 1972); SMPTE, 1972. Available at <a href="https://doi.org/10.5594/J05667" target="_blank" rel="noopener">https://doi.org/10.5594/J05667</a></span>

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A. W. Critchley; Automatic Centering Unit for the Registration of a Three-Tube Color Television Camera, Journal of the SMPTE ( Volume: 81, Issue: 1, January 1972); SMPTE, 1972
doi: 10.5594/J05667
url: https://doi.org/10.5594/J05667

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<li>
A. W. Critchley; <cite id="bib-10-5594-j05667">Automatic Centering Unit for the Registration of a Three-Tube Color Television Camera</cite>, Journal of the SMPTE ( Volume: 81, Issue: 1, January 1972); SMPTE, 1972
<span class="doi">10.5594/J05667</span>
</li>