OALib Journal期刊
ISSN: 2333-9721
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一种改进的基于MRF模型的斑块检测算法
DOI: 10.11834/jig.20091135
Keywords: 数字电影修复,斑块检测,马尔可夫随机场
Abstract:
斑块是一种常见的电影胶片损伤。提出了一种基于马尔可夫随机场(MRF)的改进的多步斑块检测及验证算法(MDV)。MDV检测算法分3个步骤。第1步将斑点检测索引算法(SDIp)和等级顺序差分检测算法(ROD)相结合以提高斑块检测算法的检全率。第2步的改进的MRF算法以第1步检测结果为运算定义域,大大减小了MRF算法的运算量。第2步随后在原始帧和运动补偿帧分别进行MRF算法检测,并通过添加去噪因子降低了改进的MRF算法的误检率。第3步通过时域的匹配技术将斑块进一步去伪存真。实验结果表明,在与现有的算法的对比中,该方法不仅有着更高的检全率和更低的误检率,而且计算速度也大大提高。
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