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Weighted cost aggregation approach for depth extraction of stereo images

영상의 깊이정보 추출을 위한 weighted cost aggregation 기반의 스테레오 정합 기법

  • 윤희주 (부산대학교 컴퓨터공학과) ;
  • 차의영 (부산대학교 컴퓨터공학과)
  • Published : 2009.06.30

Abstract

Stereo vision system is useful method for inferring 3D depth information from two or more images. So it has been the focus of attention in this field for a long time. Stereo matching is the process of finding correspondence points in two or more images. A central problem in a stereo matching is that it is difficult to satisfy both the computation time problem and accuracy at the same time. To resolve this problem, we proposed a new stereo matching technique using weighted cost aggregation. To begin with, we extract the weight in given stereo images based on features. We compute the costs of the pixels in a given window using correlation of weighted color and brightness information. Then, we match pixels in a given window between the reference and target images of a stereo pair. To demonstrate the effectiveness of the algorithm, we provide experimental data from several synthetic and real scenes. The experimental results show the improved accuracy of the proposed method.

스테레오 비전 시스템(stereo vision system)은 2차원 영상정보를 이용하여 3차원 깊이 정보를 획득하는 데 유용한 방법으로, 그동안 많은 연구가 진행되었다. 3차원 깊이 정보를 획득하기 위해서는 영상의 대응점을 찾아야 하는데, 속도와 정확성을 동시에 만족시키기가 어렵다. 이러한 문제를 해결하기 위해, 본 논문에서는 적응적 가중치(weight)를 적용한 cost aggregation 기반의 스테레오 정합 기법을 제안한다. 이 방법은 스테레오 영상의 특징을 이용하여 가중치를 획득하고, 색상정보, 밝기정보에 거리정보를 이용하여 가중치를 적용한 후, 이를 이용하여 대응점을 찾아 깊이 정보를 추출한다. 제안된 방법의 성능을 평가하기 위하여 ground truth가 존재하는 다양한 스테레오 영상을 이용하여 실험하였으며, 실험 결과 다양한 영상에서도 향상된 결과를 보였다.

Keywords

References

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