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Fast Extraction of Edge Histogram in DCT Domain based on MPEG-7  

Eom Min-Young (Dept. of Electrical and Electronic Engineering Yonsei University)
Choe Yoon-Sik (Dept. of Electrical and Electronic Engineering Yonsei University)
Won Chee-Sun (Dept. of Electronic Engineering, Dongguk University)
Nam Jae-Yeal (Dept. of Computer Science, Keimyung University)
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Abstract
In these days, multimedia data is transmitted and processed in compressed format. Due to the decoding procedure and filtering for edge detection, the feature extraction process of MPEG-7 Edge Histogram Descriptor (EHD) is time consuming as well as computationally expensive. To improve efficiency of compressed image retrieval, we propose a new edge histogram generation algorithm in DCT domain in this paper. Using the edge information provided by the only two AC coefficients of DCT coefficients, we can get edge directions and strengths directly in DCT domain. The experimental results demonstrate that our system has good performance in terms of retrieval efficiency and effectiveness.
Keywords
MPEG-7; DCT; EHD; Edge;
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