¹Graduation school of the Academy of Equipment, Beijing, China
²The Key Lab, the Academy of Equipment, Beijing, China

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Abstract—This paper presents a framework of a hybrid method designed to decompress image blocks of tilepyramid used in virtual environment especially for flight simulation. It combines two compression algorithms, namely DCT-based compression and WT-based one. Two estimator functions are proposed to choose between these two algorithms. To balance decompression performance against image quality, a selective mechanism for decompression method is introduced that depends on LOD level, image quality, bit rates and tile size. Our method is CPU-based and achieves real-time rendering performance with high image quality superior to pure DCT-based method and WTbased method.

Index Terms—DCT, Wavelet Transform, hybrid compression.

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Cite: Yanshan Bian, Lingda Wu, Chao Yang, Bo Li, "Framework of A Hybrid Image Compression Algorithm for View-dependent Visualization," Journal of Software vol. 8, no. 9, pp. 2208-2212, 2013.