利用数码相机测定面部皮肤颜色的初步研究

目的:利用数码相机进行面部皮肤颜色测定的可行性与合理性的研究.方法:在进行颜色采集之前,首先测定实验光源的稳定性.使用Canon EOS 20D单反数码相机,在实验光源稳定的时间内,以相同的拍摄参数(快门1/25 s,光圈4.5 自定义白平衡,ISO 800)采集122 例22～32 岁受试人群颌面部的皮肤颜色,拍摄文档保存为Jpeg格式.图像经Adobe photoshop7.0统一校色后,拾取皮肤CIE L*a*b*色度学空间颜色数据,利用SPSS 10.0做统计描述.结果:实验光源在21～70 min内是稳定的,可以达到比色要求.实验测得皮肤的L*a*b*色度学参数范围为:L* 49～66,a* 7～18,b* 5～22.结论:面部皮肤色度参数与测色手段和方式密切相关,数码相机作为面部赝复体的比色方法,在面部皮肤色彩信息全面采集、色彩信息准确传递方面,具有独特优势.

A study of measurement of facial skin color using digital camera

Objective; To evaluate the reliability and reasonability of maxillofacial skin color match using the digital camera. Methods; The stability of the experimental light source was evaluated before establishing the color measurement. 122 volunteers aged from 22 to 32 years were recorded by a Canon EOS 20D digital camera in studio environment when the light source was stable. Photographs were taken under a set exposure parameters(f/4.5,1/25 s,custom white balance,ISO 800) and saved as JPEG format. The CIE L~* a~* b~* color values were obtained from the digital images using Adobe Photoshop7.0 after color correction. All data were analyzed using SPSS 10. 0. Results;The experimental light source was stable in 21 to 70 minutes. It was suitable for color measurement during this period. The color parameters of all tested maxillofacial skin were:L~*49～66,a~*7 - 18,b~*5 -22. Conclusion;The assessment of maxillofacial skin color depend on method of measurement and instrument. The method of maxillofacial skin color matching by digital camera seems reliable.