A Way of Color Image Processing for the Colorblinds

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  • 色覚異常者のためのカラー画像処理
  • シキカク イジョウシャ ノ タメ ノ カラー ガゾウ ショリ

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Abstract

This paper proposes a way of reducing the number of colors contained in a JPEG image and remove block noise at the same time. The main purpose of this research is converting a kind of color images, such as Tokyo Metro map, to gray scale ones. When a color image is converted to gray scale one, two different colors are not always converted to different gray levels because of the small number of possible levels in the gray scale image. When the number of colors in a color image is appropriately small, we can assign different gray level for each color then convert it to gray scale image without any information loss. However JPEG images usually contain noise, so called block noise. In this case, before converting, we have to remove noise and reduce the number of colors.

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