Resampling of an Image by Block-Based Interpolation or Decimation with Compensation

Abstract

Due to multiple standards on digital coding of image it is expected that conversion from one picture format to another will be quite necessary for display or recording of different format sources. Conventional approach of 2-D sampling rate conversion by polyphase filters requires relatively large memory and computational power. Therefore, a new efficient method for image resampling has been presented. The proposed approach performs resampling block by block with overlap. To minimize the overlap special block interpolation kernels are used, with one pixel overlap gives satisfactory result for most of practical images. Proposed method can be efficiently applied to image communication systems where block transforms are used for data compression