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A Comparative Analysis Of Digital Filters For Image Decimation And Interpolation

It is sometimes necessary to increase or decrease the sampling rate of previously sampled images. Technically speaking, the process of increasing the sampling rate is called interpolation and the process of decreasing the :sampling rate is called decimation. In this paper we present both linear and higher-order polynomial interpolation techniques in terms of linear filtering operations (convolutions) and discuss the associated impulse responses. Several simple filters for decimation are also discussed. All these filters are compared vis-a-vis their suitability for decimation and interpolation particularly the degree to which the balance between sharpness and prevention of aliasing is maintained. Images which have been decimated or interpolated using these filters are shown.