一种离散点插值算法用于重建光谱反射率

Spectral reflectance reconstruction based on scattered data interpolation method

提出了一种用离散点插值算法来重建光谱反射率的方法。首先建立数字相机响应值与典型反射样品表面光谱反射率之间的查找表,然后进行Delaullay分区、提取和插值,最后通过数字相机的输出数据来准确地重建物体表面的光谱反射率。实验结果表明,该方法能够重建典型反射样品的光谱反射率,能够实时获取被摄场景的多光谱图像,易于硬件的实现。

A new technique for spectral reflectance reconstruction based on LUT （look-up-table） interpolation method is proposed. The spectral reflectance of the sample surface is measured by spectrometer, and the response of an RGBY digital camera is recorded. Then a LUT is created connecting the camera responses and spectral reflectance of each color chip. After that, the source space is tessellated by Delaunay method, and the neighboring points are extracted so as to calculate the spectral reflectance of the targeted point. In the end, the spectral reflectance can be reconstructed based on the interpolation method. Experimental results show that this approach can obtain the multi-spectral images in real-time so that it can be used in many applications.