Classical interpolation method based on ramp edge model considers all the edges as strong edges, which results in weak edges' distortion.
基于斜坡边缘模型的经典插值方法把所有边缘归为强边缘，导致弱边缘过分增强而失真。
Interpolation algorithm directly related to the distortion of images, interpolation function interpolation algorithm design is the core of the problem.
插值算法的好坏直接关系到图象的失真程度，插值函数的设计是插值算法的核心问题。
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