文章基本信息

标题：撮像用液晶フィルタのフレア抑制
本地全文：下载
作者：藤掛英夫 ; 佐藤弘人 ; 河北真宏等
期刊名称：映像情報メディア学会誌
印刷版ISSN：1342-6907
电子版ISSN：1881-6908
出版年度：2002
卷号：56
期号：10
页码：1669-1673
DOI：10.3169/itej.56.1669
出版社：The Institute of Image Information and Television Engineers
摘要：We studied the flare appearing in video images when a liquid crystal filter is used in front of a video camera. To clarify the generating mechanism of the flare, the relationship between the concentration of spacer particles dispersed in the liquid crystal and the intensity of light scattered by the filer was examined in detail by using a schlieren optical system with a laser light beam. We found that the light scattering is mainly caused by the spacers and glass substrates, so we evaluated their contribution ratio. From microscopic observation, we determined that the light scattering originated by the spacers includes light scattered by the spacer particles and that resulting from by liquid crystal alignment deformation caused by the spacer surfaces. As the light scattering of the spacers was in proportion to the spacer concentration, it could be considerably reduced by decreasing the spacer density. The flare in video images was reduced by decreasing the light scattering. The liquid crystal filter fabricated by using the flare-reduction method described above was utilized in actual television program.
关键词：液晶フィルタ;撮像;フレア;光散乱;スペーサ粒子