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Patent EP0517474A2 successfully refreshed from Google Patents.
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EP0517474A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Aperture correction for video cameras

Assignee: Sony Corp
•
Filing: 1992-06-02
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Granted: —
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Expires: 2012-06-02
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Abstract

Abstract A video camera apparatus comprises a zooming unit having a zoom lens movable between wide and telephoto lens positions along an optical axis (X) for zooming an optical image from an object, an image pickup (capture) device (4) that receives the optical image from the zooming unit and generates a video signal, a circuit (3) for detecting a position of the zoom lens, a circuit (12, 13, 16, 17, 21) for generating a detail signal representative of high frequency information contained in the video signal, and a circuit (3) for controlling a boost frequency of the detail signal in accordance with an output of the position detecting circuit.

Inventors

  • 👤 Fumihiko c/o Patents Division Sudou
  • 👤 Eiji c/o Patents Division Tamura

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 14:25
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N23/00; H04N23/60; H04N23/67; H04N23/673; H04N5/222; H04N5/262; H04N5/2628; H04N9/00; H04N9/44; H04N9/455; H04N9/64; H04N9/646

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 98 words
A video camera apparatus comprising: zooming means having a zoom lens movable along an optical axis for zooming an optical image from an object; image pickup means (4) for receiving the optical image from the zooming means and for generating a video signal; position detecting means (3) for detecting a position of the zoom lens; means (12, 13, 16, 17, 21) for generating a detail signal representative of high frequency information contained in said video signal; and means (3) for controlling a boost frequency of said detail signal in accordance with an output of the position detecting means.
Claim 2
Dependent Claim 20 words
Apparatus according to claim 1, wherein the zoom lens is movable between a wide angle position and a telephoto position.
Claim 3
Dependent Claim 39 words
Apparatus according to claim 2, in which the boost frequency of said detail signal is arranged to be higher when the zoom lens is in the wide angle position than when the zoom lens is in the telephoto position.
Claim 4
Dependent Claim 21 words
Apparatus according to claim 1, claim 2 or claim 3, in which said detail signal is a horizontal detail signal (HDTL).
Claim 5
Dependent Claim 58 words
Apparatus according to any one of the preceding claims, in which the detail signal generating means comprises means (12, 13, 16, 17) for generating an edge signal (S1) representing an edge component of said video signal, and a high-pass filter (21) for passing a high frequency component of said edge signal so as to generate said detail signal.
Claim 6
Dependent Claim 22 words
Apparatus according to claim 5, in which said high-pass filter (21) is a finite impulse response type digital filter (41, 42, 43).

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