コントラスト改善のためのヒストグラム平坦化に基づく適切な階調値変換関数導出法

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2011/10/01

タイトル(英語): A Novel Design Method of Gray-levels Transformation Function for Image Contrast Improvement Based on Histogram Equalization Technique

著者名: 村平　宏太（東京都市大学 工学部 生体医工学科），川上　昂（東京都市大学 工学部 生体医工学科），田口　亮（東京都市大学 工学部 生体医工学科）

著者名(英語): Kota Murahira (Department of Biomedical Engineering, Tokyo City University), Takashi Kawakami (Department of Biomedical Engineering, Tokyo City University), Akira Taguchi (Department of Biomedical Engineering, Tokyo City University)

キーワード: コントラスト改善，ヒストグラム平坦化，濃度勾配値　　contrast improvement，histogram equalization，differential gray-levels histogram

要約(英語): Histogram equalization (HE) is a simple and effective method for contrast enhancement as it can automatically define the gray-levels transformation function based on the distribution of gray-levels included in the image. HE fails to produce satisfactory results for a broad variety of low-contrast images because the HE does not use a spatial feature included in the input image. This paper proposes a novel contrast enhancement method using not only the conventional histogram but also the differential gray-levels histogram of the input image. The differential gray-levels histogram contains edge information of the input image. Edge information is one of the important spatial features of the image. We can extract the regions where are wanted to be emphasized by using both the conventional histogram and the differential gray-levels histogram. The input histogram is modified by the histogram of the extracted regions. The gray-levels transformation function is derived by the modified histogram.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.131 No.10 （2011） 特集：再生可能エネルギーの出力変動対応技術

本誌掲載ページ: 1786-1793 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/131/10/131_10_1786/_article/-char/ja/