An Efficient And Adaptive Compression Algorithm Based On DCT Transform For GPR Raw Data

Abstract

Ground Penetrating Radar(GPR) creates large amounts of data which causes serious problems for storage and transmission. In this paper, a novel compression algorithm for GPR raw data based on DCT transform and inter-frame difference is proposed. The algorithm first conducts DCT transform on the GPR raw data, and differentiates the adjacent frame data in DCT domain to reduce the variance and dynamic range. Then the differential data is evenly divided into several blocks, and different bit Lloyd-Max quantizers are selected to quantify different sub-block data through an adaptive bit allocation mechanism, thereby obtaining a higher compression gain. The compression experiments with satellite-borne GPR, aircraft-borne GPR and vehicle-borne GPR raw data confirmed the effectiveness of the compression algorithm.