DOI: 10.36347/sjet

Pages: 803-805

This is an over constraint function in the format of Through solution we could estimate the incident light direction and in turn estimate. Our experiments show that, when search space is the six dimensional parameter space, the result could hardly converge and the process is extremely slow. When we reduce the search space to containing only limited range, a globally optimal answer is often found with good match. The parameters and result of our experiments using reduced search space are shown.