DCT域中MPEG7主色描述符的提取
MPEG7 Dominant Color Descriptor Extraction in DCT Domain
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摘要: 該文在MPEG7的基礎(chǔ)上提出了DCT域內(nèi)直接提取主色描述符的新方法。這種方法節(jié)省了對圖像的解壓縮的過程，因而大大的提高了對于壓縮圖像進行特征提取的速度和效果。作為整個箅法的一部分，一種自動閾值提取的算法也在該文中給予了描述。這種方法可以減少因人為設(shè)定經(jīng)驗閾值而帶來的不確定性，使算法更具魯棒性。對比檢索試驗結(jié)果也說明本算法是一個高速有效的算法。新算法主要用于壓縮圖像庫或互聯(lián)網(wǎng)上的相似檢索。
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關(guān)鍵詞:
- 主色; DCT域; MPEG7; 圖像檢索; 多媒體技術(shù)
Abstract: An algorithm of dominant color extraction in DGT domain based on MPEG7 is described in this paper, which proposes an efficient and fast method to extract the dominant color feature from the compressed bit streams. As a part of the algorithm, a method for automatic determination of threshold is proposed too. The proposed algorithm is based on JPEG standard and some statistical parameters of DCT coefficients. Experimental results of comparison show that the proposed algorithm is effective and fast in dominant color extraction. A target application is similar retrieval in compressed image database or Internet via this proposed algorithm. -
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