| 1. | In optical character recognition , the spectral appearance of the image dependent upon the spectral reflectance of the image , the spectral response of the observer , and the spectral composition of incident light 在光学字符识别中,图象的光谱显现,它取决于图象的光谱反射系数、观察者的光谱响应和入射光线的光谱成分。 |