Design of Iight balancing filters using Iiquid crystal for image pickup

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  • 液晶を用いた撮像用色温度補正フィルターの設計
  • エキショウ オ モチイタ サツゾウヨウ イロ オンド ホセイ フィルター ノ セッケイ

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Abstract

We developed a liquid crystal filter containing dichroic dyes, which continuously control color temperature of the transmitted light in real time. The filter was designed and fabricated based on Planck radiation law and Lambert-Beer's law, as a result, it exhibited the conversion range of color temperature form 2530K to 4450K, which was equivalent to that of a conventional color glass filter, and response time of 80 ms. It is conrflirmed that the color valance of pickup image could be corrected using a camera with the filter. This filter is especially useful for television location shooting in which illumination light source changes from incandescent lamp to solar light and the color temperature of the illumination varies.

Journal

  • ITE Technical Report

    ITE Technical Report 23.40 (0), 43-48, 1999

    The Institute of Image Information and Television Engineers

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