EP0459389A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Image signal processing apparatus

Assignee: Sharp Corp

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Filing: 1991-05-28

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Granted: —

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Expires: 2011-05-28

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Abstract

Abstract An image signal processing apparatus (1) is provided with an image signal generation device (3-7) for sequentially generating image signals representing light and shade of an original image per every picture element. The image signal processing apparatus is also provided with an extreme portion detection device (10-a3) for comparing the generated image signal of an observation picture element and each of the generated image signals of a plurality of peripheral picture elements which are positioned in the vicinity of the observation picture element, and judging whether the compared observation picture element is an extreme portion or not. The image signal processing apparatus is further provided with a correction device (10-a4) for correcting a level of the image signal of the observation picture element, which is judged to be the extreme portion by the extreme portion detection device, by use of a calculation predetermined with respect to the level of the image signal.

Inventors

👤 Kazuya Masuda
👤 Kouji Yamaji

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-02 01:16

CPC Classifications

G; G06; G06T; G06T5/00; G06T5/20

Claims Analysis

Total Claims: 6

Claim 1

Independent Claim 134 words

An image signal processing apparatus (1), comprising: an image signal generation means (3-7) for sequentially generating image signals representing light and shade of an original image per every picture element; an extreme portion detection means (10-a3) for comparing said generated image signal of an observation picture element and each of said generated image signals of a plurality of peripheral picture elements which are positioned in the vicinity of said observation picture element, and judging whether said compared observation picture element is an extreme portion or not; and a correction means (10-a4) for correcting a level of said image signal of said observation picture element, which is judged to be said extreme portion by said extreme portion detection means (10-a3), by use of a calculation predetermined with respect to said level of said image signal.

Claim 2

Dependent Claim 35 words

An image signal processing apparatus according to Claim 1, wherein said extreme portion detection means (10-a3) is adapted to judge whether said observation picture element is a local maximum portion or a local minimum portion.

Claim 3

Dependent Claim 26 words

An image signal processing apparatus according to Claim 2, wherein said calculation is predetermined differently for said local maximum portion and for said local minimum portion.

Claim 4

Dependent Claim 33 words

An image signal processing apparatus according to Claim 1, wherein each of said picture elements comprises a rectangular shape, and said peripheral picture elements comprises nine picture elements surrounding said observation picture element.

Claim 5

Dependent Claim 52 words

An image signal processing apparatus according to Claim 1, wherein said extreme portion detection means (10-a3) compares said generated image signal of said observation picture element and said generated image signals of said peripheral picture elements which are disposed in up-and-down, left-and-right, and oblique directions with respect to said observation picture element.

Claim 6

Dependent Claim 26 words

An image signal processing apparatus according to Claim 1, wherein said extreme portion detection means (10-a3) and said correction means (10-a4) are composed of a microcomputer.

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