JPEG Image Retrieval Algorithm Based on DCT Coefficient
Qian Zhao · Jisuanji gongcheng · 2010
Aiming at the problem that Direct Current(DC) coefficient and Alternating Current(AC) coefficient express different image content information,this paper presents a JPEG image retrieval algorithm based on DCT coefficient.The difference vector of DC coefficient is constructed to describe image feature.The AC coefficient distribution entropy is presented according to the characteristic of the AC coefficients.The weight function for the entropy is presented to avoid the mistaken retrieval and losing retrieval.Experimental results show that the algorithm has no use for decompression and has lower complexity,and it can embody the content distribution of images well.