Extraction of Image Gamut Surface and Calculation of its Volume

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  • 画像の色立体外郭点抽出と色域体積の算出
  • ガゾウ ノ イロ リッタイ ガイカクテン チュウシュツ ト ショクイキ タイセキ ノ サンシュツ

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Communicating color gamut is very important in color research and application. The problem of calculating image gamut, however, has no definitive solution yet. In this paper, we introduce that an entire gamut volume can be calculated by tetrahedral color values listed in known orders. The corresponding color gamuts are analyzed and compared. However, the orders of color values in a given image are unknown at first. We propose a new method for calculating the gamut volume by rearranging the color values. The entire color space is firstly divided by hue angle ΔHab and secondly by lightness ΔL* where the steps (ΔHab, ΔL*) are decided in non-uniform to include the constant color samples in each segmented sectors. Finally the most out-side points from the center are extracted and the entire gamut volume is calculated by summing up the individual volume of tetrahedral with selected color values. This method is available to describe the surface of image color gamut.

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