Gonio spectral imaging of document materials adaptive to spatial gloss distributions

提出了一种根据样品光泽度设置自适应曝光条件的高动态范围角度光谱成像方法。利用镜面反射区域的邻域信息，将光强测量的动态范围提高了6倍。图像采集实验验证了该方法的有效性。测量几何条件的优化提供了一个标准，即采样间隔应小于镜面峰形的半高宽。

A high dynamic range gonio-spectral imaging method was proposed by setting exposure conditions adaptive to the glossiness of samples. The dynamic range of intensity measurement was improved by six times by using the information of neighborhood of specular reflection region. The effectiveness of proposed method was confirmed by an image acquisition experiment. The optimization of measurement geometries provided a criterion that sampling intervals should be shorter than the FWHM of specular peak profile.