Development of the Precision Focus Assistance System for the HDTV Zoom Lens

Metadata

Publisher: SMPTE — White Plains, NY
Doc Type: Conference Paper
Content Type: Original Research
Volume: 2004, No. 1, pp. 1–10
Abstract: In this focusing system, a TV zoom lens has a contrast-type auto-focus function incorporated which utilizes differences in optical path length and assists a camera operator in getting his or her focused images precisely in focus. This system, by utilizing the characteristic of the image surface contrast getting maximized when the lens gets focused on an object, controls the focusing lens group so that the high frequency ingredient of the video signals, or the contrast, may be maximized. In order to achieve an auto-focus function that satisfies our requirements for large-size zoom lenses, we have invented a device called the “Precision Focusing System” which has both the contrast-type function and the function which utilizes differences in optical path length. With this system, we have developed an interchangeable lens that incorporates a CCD for focus evaluation and an imaging circuit.
Publication Date: 2004-02-01
DOI: 10.5594/M001013
Link: https://doi.org/10.5594/M001013
Author(s): Masao WadaField Operations, Broadcast Engineering Department NHK Japan Broadcasting Corporation
Copyright: © 2004 Society of Motion Picture and Television Engineers, Inc.

Source Data (JSON)

Full registry record with provenance metadata. Open directly: /api/doc/10.5594-M001013.json

Reference this Doc

Plain text (ISO 690 compliant)

Preview:

Masao Wada; Development of the Precision Focus Assistance System for the HDTV Zoom Lens, SMPTE Meetings and Conferences ( February 2004); SMPTE, 2004. Available at https://doi.org/10.5594/M001013

Snippet:

Masao Wada; Development of the Precision Focus Assistance System for the HDTV Zoom Lens, SMPTE Meetings and Conferences ( February 2004); SMPTE, 2004. Available at https://doi.org/10.5594/M001013

HTML (ISO 690 compliant)

Preview:

Masao Wada; Development of the Precision Focus Assistance System for the HDTV Zoom Lens, SMPTE Meetings and Conferences ( February 2004); SMPTE, 2004. Available at https://doi.org/10.5594/M001013

Snippet:

<span class="citation">Masao Wada; <cite>Development of the Precision Focus Assistance System for the HDTV Zoom Lens</cite>, SMPTE Meetings and Conferences ( February 2004); SMPTE, 2004. Available at <a href="https://doi.org/10.5594/M001013" target="_blank" rel="noopener">https://doi.org/10.5594/M001013</a></span>

SMPTE's HTML Pub

Preview:

Masao Wada; Development of the Precision Focus Assistance System for the HDTV Zoom Lens, SMPTE Meetings and Conferences ( February 2004); SMPTE, 2004
doi: 10.5594/M001013
url: https://doi.org/10.5594/M001013

Snippet:

<li>
Masao Wada; <cite id="bib-10-5594-m001013">Development of the Precision Focus Assistance System for the HDTV Zoom Lens</cite>, SMPTE Meetings and Conferences ( February 2004); SMPTE, 2004
<span class="doi">10.5594/M001013</span>
</li>