光谱灵敏度是数码相机的一项重要参数,利用光谱灵敏度,可以较为快捷地实现传感器响应值与颜色刺激值之间的转换。根据数码相机的成像原理,使用卤钨灯、单色仪、分光辐射亮度计等搭建实验光路,对Canon 500D和Nikon D7000两台商用数码相机进行光谱灵敏度的测量实验,获得形状及平滑度不同的三通道光谱灵敏度。在标准光源下进行24色卡的拍摄和光谱取样,对两台数码相机的RGB测量值及基于光谱灵敏度的预测值进行比较,分别获得平均值为1.7%和0.5%的相对误差。

Spectral sensitivity is one of the important parameters of digital cameras.It is convenient to realize the transition between the response of digital cameras and the tristimulus values by spectral sensitivity.According to the imaging mechanism of digital cameras,experiments were performed with a halogen tungsten lamp,a monochromator and a spectrophotometer for the spectral sensitivity measurement of all the three channels of two commercial digital cameras Canon 500D and Nikon D7000.Then the photos and the spectral data of a 24-color chart under illumination of a standard light source are obtained,and the relative errors between the predicted RGB values and the measured values are calculated.As a result,the average prediction errors of 1.7% for Canon and 0.5% for Nikon are obtained.