complex non-linear-function approximation 复杂非线性函数逼近
non-linear function approximation 非线性函数逼近
non-linear numerical approximation 非线性数值逼近
approximation of non-linear functions 非线性函数拟合
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Then, it approximates the environment map in the same wavelet basis by keeping only the largest terms to get a non-linear approximation of the environment-map.
然后用相同的小波基对给定的环境光做小波变换，只保留其中绝对值较大的系数，从而得到环境光的非线性逼近。
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