Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Color Modification Detection Using Normalization and Weighted Sum of Color Components

컬러 성분의 정규화와 가중치 합을 이용한 컬러 조작 검출

  • Shin, Hyun Jun (Dept. Electronics Eng., Pusan National University) ;
  • Jeon, Jong Ju (Dept. Electronics Eng., Pusan National University) ;
  • Eom, Il Kyu (Dept. Electronics Eng., Pusan National University)
  • Received : 2016.08.24
  • Accepted : 2016.11.16
  • Published : 2016.12.25
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Abstract

Most commercial digital cameras acquire the colors of an image through the color filter array, and interpolate missing pixels of the image. Because of this fact, original pixels and interpolated pixels have different statistical characteristics. If colors of an image are modified, the color filter array pattern that consists of RGB channels is changed. Using this pattern change, a color forgery detection method were presented. The conventional method uses the number of pixels that exceeds the maximum or minimum value of pre-defined block by only exploiting green component. However, this algorithm cannot remove the flat area which is occurred when color is changed. And the conventional method has demerit that cannot detect the forged image with rare green pixels. In this paper, we propose an enhanced color forgery detection algorithm using the normalization and weighted sum of the color components. Our method can reduce the detection error by using all color components and removing flat area. Through simulations, we observe that our proposed method shows better detection performance compared to the conventional method.

대부분의 디지털 카메라는 컬러 필터 어레이를 통하여 영상의 컬러를 획득하고 비어 있는 화소를 보간하는 방법을 사용한다. 이로 인해 원 화소와 보간된 화소는 서로 다른 통계적 특정을 가지고 있다. 영상에 컬러 조작이 일어나면, RGB 컬러 채널로 이루어진 컬러 필터 어레이의 패턴에 변화가 생기게 된다. 이러한 특성을 이용하여 영상의 컬러 조작 검출 방법이 제안되었다. 기존의 방법은 녹색 채널의 값만을 이용하여 미리 정해진 블록 내에서 최댓값 또는 최솟값을 벗어나는 화소의 수를 이용하고 있다. 그러나 이러한 방법은 색상을 변화시킬 때 발생하는 평탄 영역을 제거하기 못하며, 녹색이 거의 없는 영상에 대한 조작을 검출 할 수 없는 단점이 존재한다. 본 논문에서는 컬러 채널의 정규화와 가중치 합을 이용한 개선된 컬러 조작 검출 방법을 제안한다. 본 논문의 방법은 색상을 변화시킬 때 발생하는 평탄한 영역을 제거하고, 모든 색상을 사용하기 때문에 조작 검출의 오차를 줄일 수 있다. 실험을 통하여 제안 방법이 기존의 방법과 비교하여 우수한 컬러 조작 검출 성능을 보임을 확인 할 수 있었다.

Keywords

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