利用计算机读取整茶色泽参数的方法研究

Study on the Method of Fetching Unbroken Tea Color with Computer

建立了一种用计算机读取整茶色泽参数的方法——L处理法,并验证了其可靠性和对该方法进行了研究。结果表明,L处理法可以准确快速地读取整茶图象的色泽参数。扫描分辨率为100dpi时,扫描图像的色泽参数95%置信区间分别为:L=0,-0.45≤a≤0.45,-0.71≤b≤0.71;当整茶扫描区域达到11cm×11cm或以上时,扫描图片的色泽参数可以代表茶样的实际色泽状况,其标准误(SE)分别为:-0.16≤L≤0.16,-0.13≤a≤0.13,b=0;整茶色泽参数与粉碎茶色泽参数存在显著差别,粉碎茶不能代表茶叶真实的外观色泽;电脑读取色泽参数的稳定性优于色差计。

A new method of fetching unbroken tea color with computer, named L Method, has been established. The accuracy of the method was verified, and the further investigation also has been fulfilled. The results showed that the L method can fetch the color of tea accurately and quickly. Scanned with resolution 100dpi, the credible interval（95%） of the result is： L=0, -0.45≤a≤0.45,-0.71≤b≤0.71. When the scanned area is 11 cm × 11 cm or more, the color parameters of tea scanning photo may fully stand for the tea actual color. The SE is： -0.16≤L≤0.16,-0.13≤a≤0.13, b=0. There was obvious distinction between the color of unbroken tea and crush tea, so the later can＇t represent the tea actual color. Using computer to fetch color parameters is better than chroma meter.