Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Content-based image retrieval using adaptive representative color histogram and directional pattern histogram

적응적 대표 컬러 히스토그램과 방향성 패턴 히스토그램을 이용한 내용 기반 영상 검색

  • Kim Tae-Su (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Kim Seung-Jin (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Lee Kuhn-Il (School of Electrical Engineering and Computer Science, Kyungpook National University)
  • 김태수 (경북대학교 전자전기컴퓨터학부) ;
  • 김승진 (경북대학교 전자전기컴퓨터학부) ;
  • 이건일 (경북대학교 전자전기컴퓨터학부)
  • Published : 2005.07.01
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Abstract

We propose a new content-based image retrieval using a representative color histogram and directional pattern histogram that is adaptive to the classification characteristics of the image blocks. In the proposed method the color and pattern feature vectors are extracted according to the characteristics o: the block classification after dividing the image into blocks with a fixed size. First, the divided blocks are classified as either luminance or color blocks depending on the saturation of the block. Thereafter, the color feature vectors are extracted by calculating histograms of the block average luminance co-occurrence for the luminance block and the block average colors for the color blocks. In addition, block directional pattern feature vectors are extracted by calculating histograms after performing the directional gradient classification of the luminance. Experimental results show that the proposed method can outperform the conventional methods as regards the precision and the size of the feature vector dimension.

본 논문에서는 영상의 블록 분류 특성에 적응적인 대표 컬러 히스토그램 (representative color histogram)과 방향성 패턴 히스토그램 (directional pattern histogram)을 이용한 새로운 내용 기반 영상 검색 방법 (content-based image retrieval)을 제안한다. 제안한 방법에서는 영상을 일정한 크기의 블록으로 나누고, 분할된 블록의 분류 특성에 따라 컬러와 패턴 특징 벡터를 추출한다. 먼저 분할된 블록을 채도 (saturation)에 따라 휘도 블록 또는 컬러 블록으로 분류한 후, 휘도 블록에 대해서는 블록 평균휘도 쌍의 히스토그램을 구하고, 컬러 블록에 대해서는 블록 평균 컬러 쌍 히스토그램을 구함으로써 블록 분류 특징에 따라 컬러 특징 벡터를 추출한다. 또한 블록 휘도 변화의 기울기 (gradient)를 계산하여 방향성 분류를 행한 후 히스토그램을 계산함으로써 블록 방향성 패턴 특징을 추출한다. 본 논문에서 제안한 영상 검색 방법의 성능을 평가하기 위해서 컴퓨터 모의실험을 행한 결과 제안한 방법이 기존의 방법들보다 정확도 (precision) 및 특징 벡터 차원 (feature vector dimension) 크기 등의 객관적인 측면에서 우수함을 확인하였다.

Keywords

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