Human face texture is represented as a linear combination of several training images, and, based on the face texture in the bright area, face illumination is restored by recovering face texture through a least-square estimation.

• 它使用参考人脸模型估计人脸的光照阴影区域；把人脸的纹理表示为训练图像模型的线性组合；根据人脸光照明亮区域的纹理信息；使用最小二乘法估计出最优的线性组合系数；从而重建原图像人脸纹理实现人脸光照恢复.