KIPS Transactions on Software and Data Engineering (정보처리학회논문지:소프트웨어 및 데이터공학)

Korea Information Processing Society (한국정보처리학회)
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Copyright Protection for Fire Video Images using an Effective Watermarking Method

효과적인 워터마킹 기법을 사용한 화재 비디오 영상의 저작권 보호

  • ;
  • 김종면 (울산대학교 전기공학부)
  • Received : 2012.11.12
  • Accepted : 2013.04.10
  • Published : 2013.08.31
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Abstract

This paper proposes an effective watermarking approach for copyright protection of fire video images. The proposed watermarking approach efficiently utilizes the inherent characteristics of fire data with respect to color and texture by using a gray level co-occurrence matrix (GLCM) and fuzzy c-means (FCM) clustering. GLCM is used to generate a texture feature dataset by computing energy and homogeneity properties for each candidate fire image block. FCM is used to segment color of the fire image and to select fire texture blocks for embedding watermarks. Each selected block is then decomposed into a one-level wavelet structure with four subbands [LL, LH, HL, HH] using a discrete wavelet transform (DWT), and LH subband coefficients with a gain factor are selected for embedding watermark, where the visibility of the image does not affect. Experimental results show that the proposed watermarking approach achieves about 48 dB of high peak-signal-to-noise ratio (PSNR) and 1.6 to 2.0 of low M-singular value decomposition (M-SVD) values. In addition, the proposed approach outperforms conventional image watermarking approach in terms of normalized correlation (NC) values against several image processing attacks including noise addition, filtering, cropping, and JPEG compression.

본 논문에서는 화재 비디오 영상의 저작권 보호를 위해 효과적인 워터마킹 기법을 제안한다. 제안하는 워터마킹 기법은 명암도 동시발생 행렬과 퍼지 클러스터링 알고리즘을 이용하여 화재의 색상과 텍스처의 특징을 효율적으로 이용한다. 명암도 동시발생 행렬은 각 후보 화재 영상의 블록에 대한 에너지와 동질성을 계산하여 텍스처 데이터 셋을 만드는데 사용하며, 퍼지 클러스터링은 화재 비디오 영상의 색상 분할과 워터마커 삽입을 위한 텍스처 블록을 결정하기 위해 사용된다. 선택된 텍스처 블록은 이산 웨이블릿 변환을 통해 네 가지 서브밴드 (LL, LH, HL, HH)를 가지는 1차 레벨 웨이블릿 구조로 분해되고, 워터마커는 사람의 시각에 영향을 주지 않는 LH 영역에 삽입된다. 모의실험결과, 제안한 워터마킹 기법은 약 48 데시벨의 높은 첨부 신호 대 잡음 비와 1.6-2.0의 낮은 M-특이치 분해 값을 보였다. 또한, 제안한 워터마킹 기법은 노이즈 첨가, 필터링, 크로핑, JPEG 압축과 같은 영상처리 공격에서도 기존 이미지 워터마킹 알고리즘보다 정규화된 상관 값에서 높은 성능을 보였다.

Keywords

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