CAJ | 학술논문

条纹失真是降低视频图像质量的一个重要因素。现有的条纹失真去除算法需要已知条纹方向等先验知识，如何自动地判断和获取条纹失真图像以及条纹的方向有重要的研究意义。提出一种检测无参考视频图像中单一方向条纹失真的方法，并获取条纹与水平正方向的夹角。算法的核心思想基于条纹图像的频率特性，即图像中的条纹的频谱能量值会在频域空间中沿着与空域中条纹方向正交的方向附近聚集，且在对应的频率分量处会出现峰值。针对单一方向的条纹失真视频图像，实验结果表明，提出的算法具有很好的检测效果，且能够较准确地确定条纹的方向。另一方面，算法对随机噪声不敏感，对低对比度条纹仍具有较高的检测率。
조문실진시강저시빈도상질량적일개중요인소。현유적조문실진거제산법수요이지조문방향등선험지식，여하자동지판단화획취조문실진도상이급조문적방향유중요적연구의의。제출일충검측무삼고시빈도상중단일방향조문실진적방법，병획취조문여수평정방향적협각。산법적핵심사상기우조문도상적빈솔특성，즉도상중적조문적빈보능량치회재빈역공간중연착여공역중조문방향정교적방향부근취집，차재대응적빈솔분량처회출현봉치。침대단일방향적조문실진시빈도상，실험결과표명，제출적산법구유흔호적검측효과，차능구교준학지학정조문적방향。령일방면，산법대수궤조성불민감，대저대비도조문잉구유교고적검측솔。
Strip distortion is an important factor in video image quality reduction,but current stripe distortion removal algorithms usually require the priori knowledge of the known stripe directions,etc.How to automatically judge and procure stripe distortion images and their stripe directions then have the research significance.We propose a method in this paper to detect the stripe distortion in single direction in no-reference video image,and obtain the angle between the stripe and the positive horizontal direction.The core idea of the algorithm is based on the frequency feature of the stripe image,i.e.the spectral energy of the stripe in image will gather in spectral domain space along the vicinity of the direction orthogonal to the direction of the stripe in spatial domain,and there are peaks occurring in corresponding frequency components.For the video image with stripe distortion in single direction,the experimental results show that the proposed algorithm has good detection effect,and can determine the direction of the strip rather accurately.On the other hand,the algorithm is insensitive to random noise,but still has higher detection rate against the stripe with low contrast.