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JPH0846784A Expired / Lapsed JP ⏱️ 0.0 years remaining

Image processing device

Assignee: Brother Industries Ltd
•
Filing: 1994-07-27
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Granted: —
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Expires: 2014-07-27
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Abstract

Abstract Translated from Japanese (57)【要約】 【目的】 誤差拡散法によって中間調画像を2値化する に際して、分配された誤差による補正が早く反映される ようにして、画像の濃度が急激に変化するエッジ部にお いても、記録画素が誤差の配分方向に偏ることのない疑 似中間調の画像データを作成することができるようにす る。 【構成】 中間調画像を2値化する際に発生した誤差を 周辺画素に分配する誤差拡散法によって疑似中間調の画 像データを作成するに際して、画像を2値化するための 閾値Tvar を、注目画素の入力濃度値Iに基づいて入力 濃度がわに偏るように決定し、注目画素の入力濃度に対 する、配分された誤差の比重を大きくする。そして、注 目画素の入力濃度値Iに重み付け誤差和Eを加算した補 正入力濃度I’と、閾値Tvar とを比較して、出力濃度 値Oを決定し、2値化処理を行う。 (57) [Abstract] [Purpose] When binarizing a halftone image by the error diffusion method, the correction due to the distributed error is reflected early so that even the edge portion where the image density changes abruptly. , It is possible to create pseudo halftone image data in which recorded pixels are not biased in the error distribution direction. [Structure] At the time of creating pseudo halftone image data by an error diffusion method that distributes an error generated when binarizing a halftone image to peripheral pixels, a threshold Tvar for binarizing the image is noted. Based on the input density value I of the pixel, the input density is determined to be biased, and the weight of the distributed error with respect to the input density of the target pixel is increased. Then, the corrected input density I ′ obtained by adding the weighting error sum E to the input density value I of the pixel of interest is compared with the threshold value Tvar, the output density value O is determined, and binarization processing is performed.

Inventors

  • 👤 Mayumi Nomura
  • 👤 まゆみ 野村

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-11-09 11:34
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4051; H04N1/4052; H04N1/4053

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