Fast Image Coding Algorithm Using Indirect-Index Codebook Based on SMVQ

来源 :Journal of Electronic Science and Technology | 被引量 : 0次 | 上传用户:sangyilin
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Side-match vector quantization(SMVQ) achieves better compression performance than vector quantization(VQ) in image coding due to its exploration of the dependence of adjacent pixels. However, SMVQ has the disadvantage of requiring excessive time during the process of coding. Therefore, this paper proposes a fast image coding algorithm using indirect-index codebook based on SMVQ(IIC-SMVQ) to reduce the coding time. Two codebooks, named indirect-index codebook(II-codebook) and entire-state codebook(ES-codebook), are trained and utilized. The II-codebook is trained by using the Linde-Buzo-Gray(LBG) algorithm from side-match information, while the ES-codebook is generated from the clustered residual blocks on the basis of the II-codebook. According to the relationship between these two codebooks,the codeword in the II-codebook can be regarded as an indicator to construct a fast search path, which guides in quickly determining the state codebook from the ES-codebook to encode the to-be-encoded block. The experimental results confirm that the coding time of the proposed scheme is shorter than that of the previous SMVQ. Side-match vector quantization (SMVQ) achieves better compression performance than vector (VQ) in image coding due to its exploration of the dependence of adjacent pixels. However, SMVQ has the disadvantage of requiring excessive time during the process of coding. Therefore, this paper proposes a fast image coding algorithm using indirect-index codebook based on SMVQ (IIC-SMVQ) to reduce the coding time. Two codebooks, named indirect-index codebook (II-codebook) and the entire-state codebook The II-codebook is trained by using the Linde-Buzo-Gray (LBG) algorithm from side-match information, while the ES-codebook is generated from the clustered residual blocks on the basis of the II-codebook . According to the relationship between these two codebooks, the codeword in the II-codebook can be regarded as an indicator to construct a fast search path, which guides in quickly determining the state codebook from the ES-codebook to encode the to-be- enco ded block. The experimental results confirm that the coding time of the proposed scheme is shorter than that of the previous SMVQ.
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