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EP0810778A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Digital still camera with a gamma correction circuit

Assignee: Sanyo Electric Co Ltd
•
Filing: 1997-06-02
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Granted: —
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Expires: 2017-06-02
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Abstract

Abstract A digital still camera includes a shutter release button. A first gamma correction circuit, when a shutter release button is depressed, makes reference to a first gamma table to correct a camera signal by a gamma characteristic of a raster scan display, creating a first image signal. The first image signal is subjected to interpolation/thinning-out and image processing by a first signal processing circuit, and a thinned-out image signal is corrected in a second gamma correction circuit by a gamma characteristic for converting a raster-scan display gamma characteristic into a dot-matrix display gamma characteristic, thereby creating a second image signal. The second image signal is displayed on an LCD (Liquid Crystal Display). The first image signal is also subjected by a second signal processing circuit to interpolation, YUV conversion and JPEC compression so that a compressed image signal is stored in a memory flash. The compressed image signal is read out of the flash memory as required, to be outputted to a CRT.

Inventors

  • 👤 Toshinobu Haruki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 22:45
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/00129; H04N1/0035; H04N1/00405; H04N1/00408; H04N1/0044; H04N1/21; H04N1/2104; H04N1/2112; H04N9/00; H04N9/64; H04N9/68; H04N9/69; H04N2101/00

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 93 words
A digital still camera comprising: a shutter release button; a first correction means for correcting a camera signal, at time that said shutter release button is depressed, by a first gamma characteristic to output a first image signal; a storing means for storing the first image signal in a memory; a second correction means for correcting the first image signal by a second gamma characteristic to output a second image signal; and a display means for displaying the second image signal until storage of the first image signal to said memory is completed.
Claim 2
Dependent Claim 40 words
A digital still camera according to claim 1, wherein the first correction means includes a first table previously stored with the first gamma characteristic, and said second correction means includes a second table previously stored with the second gamma characteristic.
Claim 3
Dependent Claim 122 words
A digital still camera according to claim 2, wherein the first correction means further includes a third table previously stored with a third gamma characteristic and a selecting means for selecting either one of the first table or the third table, said camera further comprising: a control means for causing said selecting means to select the first table during a time period of from depression of said shutter release button to completion of storage of the first image signal to said memory, and select the third table before depression of said shutter release button or after completion of storage of the first image signal; and a disabling means for disabling said second correction means while said selecting means selects the third table.
Claim 4
Dependent Claim 62 words
A digital still camera according to claim 3, wherein    said display means is a dot matrix display, said first gamma characteristic has a gamma characteristic of raster scan display, said third gamma characteristic has a gamma characteristic of the dot matrix display, and the second gamma characteristic has a gamma characteristic for converting the first gamma characteristic into the third gamma characteristic.
Claim 5
Dependent Claim 41 words
A digital still camera according to claim 1, further comprising: a muting means for subjecting muting to said display means during a second predetermined period from depression of said shutter release button to completion of correction by said second correcting means.
Claim 6
Dependent Claim 25 words
A digital still camera according to claim 1, further comprising: an electronic flash means that operates in response to operation of said shutter release button.

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