光源对色标数码色度值的影响  

Effect of the orientation of the light on the digital chromatic value of color code

作　　者：魏斌[1] 许敏[1] 陈凌[1] 

机构地区：[1]福建医科大学附属第一医院口腔科,福建福州350005

出　　处：《中国医药导报》2008年第16期99-100,102,共3页China Medical Herald

基　　金：福建省教育厅科技项目;项目编号:JA03105

摘　　要：目的:研究不同方向光源对数码色度值的影响。方法:固定数码相机拍摄设置,在同样光强度但投射方向不同下拍摄同一色标,比教色标上同样点的色度值(L、a、b),检测色度值是否发生变化及其规律。结果:强度相同但方向不同的光源会造成色标数码色度值不同,顺着光的方向L值逐渐变小,而a和b值变化不明显。环行光源可以提供从四周到中央的光亮度逐渐移行,从中央点到外周的同一圆周线上光强度是一样的,色度值也基本相同。结论:不同方向的光会对数码色度值造成影响,使用环形灯作光源,并保证对照色标和被测色标处于画面中央对称位置则可以获得较为准确的比色效果。Objective ：To study the effect of light from different direction on digital chromatic value.Methods： To set up the setting of digital camera, and shoot the same color code under the same light intensity but different direction, then to compare the chromatic value of the same point on the color code and detect the change and regularity of them.Results： The light source of the same intensity but different direction would cause the change of the digital chromatic value. The L value diminished gradually,the changes of a value and b value were not significant. Armillary light source could provide light intensity from surrounding to center, and the intensity of light changed gradually. The intensity of light was the same from the point of the center to the same circumference line of the surrounding. The chromatic value were the same basi- cally.Conclusion：The light of different direction would affect the chromatic value. Comparatively accurate colorimetric effect could be obtained when to use armillary light as light source and to ensure control group and test group were located in symmetrical location of the center.

关 键 词：比色 数字化比色 数码摄影 色度值 

分 类 号：R783.2[医药卫生—口腔医学]