Video signal processing circuit

Assignee: Sanyo Electric Co Ltd

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Filing: 1992-06-22

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Granted: —

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Expires: 2012-06-22

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Abstract

Abstract A video signal processing circuit is incorporated in an IC for camcorder in which a camera signal outputted from a CCD image sensor is processed in a digital manner such that luminance and color signals can be outputted. In the IC, a vertical interpolation circuit produces two kinds of vertically interpolated data on the basis of a digital camera signal of one channel within an image area being set by an electronic zoom function. A YC separation circuit receives the two kinds of vertically interpolated data, and an output of the YC separation circuit is applied a horizontal interpolation circuit or an RGB composition circuit If the YC separation output is applied to the horizontal interpolation circuit, the same outputs two kinds of horizontally interpolated data upon which three primary color signals are composed by the RGB composition circuit. If the YC separation output is applied to the RGB composition circuit, the horizontal interpolation circuit produces two kinds of horizontally interpolated data on the basis of three primary color data outputted by the RGB composition circuit.

Inventors

👤 Haruhiko Murata
👤 Yukio Mori
👤 Akihiro Maenaka
👤 Masao Takuma
👤 Kiyotada Kawakami
👤 Tooru Yamamoto
👤 Tooru Asaeda

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 20:52

CPC Classifications

H; H04; H04N; H04N9/00; H04N9/64

Claims Analysis

Total Claims: 3

Claim 1

Independent Claim 161 words

A video signal processing circuit incorporated in an integrated circuit, which receives a digital camera signal obtained through an A/D conversion of an analog camera signal which is outputted by an image sensor, and performs a digital signal processing so as to produce a luminance signal and a color signal, said video signal processing circuit further comprising: vertical interpolation means for performing a vertical interpolation of the digital camera signal of one channel within an image area which is set by an electronic zoom function so as to produce two kinds of vertically interpolated data having color information different from each other; YC separation means for receiving said vertically interpolated data and producing two kinds of differential color data: horizontal interpolation means for receiving said differential color data and producing two kinds of horizontally interpolated data correspondingly to said two kinds of vertically interpolated data; and color signal composition means for converting said horizontally interpolated data into three primary color signals.

Claim 2

Dependent Claim 165 words

A video signal processing circuit incorporated in an integrated circuit, which receives a digital camera signal obtained through an A/D conversion of an analog camera signal which is outputted by an image sensor, and performs a digital signal processing so as to produce a luminance signal and a color signal, said video signal processing circuit further comprising: vertical interpolation means for performing a vertical interpolation of the digital camera signal of one channel within an image area which is set by an electronic zoom function so as to form and output two kinds of vertically interpolated data having color information different from each other; two-channel Y/C separation means for receiving said vertically interpolated data and producing two kinds of differential color data: color signal composition means for converting said differential color data into three primary color data; and horizontal interpolation means for receiving said three primary color data and producing two kinds of horizontally interpolated data correspondingly to said two kinds of vertically interpolated data.

Claim 3

Dependent Claim 139 words

A video signal processing circuit incorporated in an integrated circuit, which receives a digital camera signal obtained through an A/D conversion of an analog camera signal which is outputted by an image sensor, and performs a digital signal processing so as to produce a luminance signal and a color signal, said video signal processing circuit further comprising: gamma correction means for gamma-correcting luminance data after Y/C separation; and knee correction means provided at a succeeding stage of said gamma correction means, said knee correction means having an input/output characteristic which is a first linear line with a first incline within a first range where an input level is low and a second linear line with a second incline smaller than said first incline within a second range where the input level is larger than that of said first range.

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