分析了小波双线性插值中高频外推阈值门限与重建图像峰值信噪比的变化关系，提出了峰值信噪比最大小波双线性插值迭代算法。

The variable relationship between the threshold of the extrapolation and its correspondent Peak of the Signal-to-Noise Ratio (PSNR) in the Wavelet Bi-linear Interpolation Algorithm is deeply analyzed.

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序列变换是依据外推法的原理，通过序列的核来插值序列的某些项，最后求解线性方程组得到的。

Sequence transformation is based on the principle of extrapolation, interpolating certain items by the kernel of the sequence, and finally is obtained by solving linear equations.

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