采集舌象用光源的光谱研究

Study On Illuminant Spectrum Qualifications for Collecting Tongue Condition

在中医舌诊中,传统的光源通常为自然光甚至烛光,易受气候,环境干扰,不利于医生获得正确的舌苔色泽信息。文章引进人造光源作为对自然光源的补充或直接应用人造光源来代替自然光,能得到稳定和真实的舌态图像,获得科学严谨的诊断结果。不同的光源由于其各异的辐射光谱功率分布,显色性Ra和色温Tc的不同对同一物体照明会产生不同的颜色。文章选择了四种人造光源,通过光谱分析和分别照明时拍摄的相同图像[1]、舌象,用舌象视觉计算比较的方法选出了最佳光谱对应的光源,并在多个光学参数,色坐标容差椭圆等色度学参数上进行比较,得出一种最接近于自然光的光源,即PHILIPS YPZ220/18-3U.RR.D型光源,其色温为6 500 K的光谱特性及光学参数最接近自然光源,可作为采集舌象时的照明标准光源。此方法可为选择人造标准光源替代自然日光提供理论和实验依据。

The traditional light sources in the diagnostic method of tongue collection such as daylight or even candles are easily affected by weather and environment. It isn＇t favorable for doctors to obtain the accurate information of the tongue condition. The authors＇ introduce the electric light sources to compensate or replace daylight to obtain stable and real tongue image and sei- entitle results. Lighted by lamps with different radiation speetrurn power distribution property, various color rendition and color temperature, the same object will indicate different colors. In this study, spectrum analysis is carried out on four fluorescent lamps and the research is based on iamge identification techniques of tongue color. Applying the methods of spectrum analysis, choose the best one in four illuminants with their specific spectrum by testing instruments and comparing with the results using several spectrum parameters and chromatic coordinates tolerance ellipses. Result showed PHILIPS YPZ220/18-3U. RR. D（with the correlative color temperature 6 500 K） lamp which has the most similar spectrum property with daylight can be used as standard lamp. The research provides the theoretic and experimental basis for choosing electric light sources to replace daylight.