灰度传递函数分析，(a)高斯传递模型，(b)和(c)分别是理想编码图经过结构光系统前后的灰度分布，(d)和(e)分别是编码图和采集图。-Gray transfer function analysis, (a) Gaussian transfer model, (b) and (c) are the ideal coding picture through structured light system before and after gray level, (d) and (e) are co