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JPH06242521A Expired / Lapsed JP ⏱️ 0.0 years remaining

Gray balance correction method

Assignee: Fujifilm Holdings Corp
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Filing: 1993-02-16
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Granted: —
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Expires: 2013-02-16
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Abstract

Abstract Translated from Japanese (57)【要約】 【目的】 異種光源で撮影された画像に対する色バラン スの補正能力が低下することがなく、かつフェリアの影 響を排除することができるグレーバランス補正方法を得 る。 【構成】 ネガフィルムに記録された画像を多数個の領 域に分割して各領域毎にC、M、Yの濃度値を各々測定 し、濃度値の測定値に基づいて各色毎に最大基準値C max 、M max 、Y max 及び最小基準値C min 、M min 、 Y min を定める。次に、各色の最大基準値の変換後の値 をD max に一致させ、かつ各色の最小基準値の変換後の 値をD min に一致させるために、(A)〜(C)に示す ように変換関係の係数A及び定数Bを各色毎に求め、前 記求めた係数A及び定数Bにより定まる変換関係を用い てC、M、Yの測定値を変換する。これにより、グレー バランスのとれたC’画像、M’画像、Y’画像が得ら れる。 (57) [Abstract] [Purpose] To obtain a gray balance correction method capable of eliminating the influence of ferria without deteriorating the ability to correct color balance with respect to images photographed by different light sources. [Structure] The image recorded on the negative film is divided into a number of areas, and the C, M, and Y density values are measured for each area, and the maximum reference value for each color is determined based on the measured density values. C max , M max , Y max and minimum reference values C min , M min , Determine Y min . Next, in order to match the converted value of the maximum reference value of each color with D max and the converted value of the minimum reference value of each color with D min , as shown in (A) to (C). The coefficient A and the constant B having the conversion relationship are obtained for each color, and the measured values of C, M, and Y are converted using the conversion relationship determined by the obtained coefficient A and the constant B. As a result, gray-balanced C ', M', and Y'images are obtained.

Inventors

  • 👤 Keiichi Yamana
  • 👤 啓一 山名

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-11-09 12:45
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