针对错误匹配点干扰条件下的多单应矩阵估计问题,提出了一种对错误匹配点鲁棒的多单应矩阵估计初始化方法.该方法基于特征点对的代数误差和结构相似性约束条件,将错误匹配点剔除策略有机地融合到单应矩阵估计的过程中,在不增加计算复杂...针对错误匹配点干扰条件下的多单应矩阵估计问题,提出了一种对错误匹配点鲁棒的多单应矩阵估计初始化方法.该方法基于特征点对的代数误差和结构相似性约束条件,将错误匹配点剔除策略有机地融合到单应矩阵估计的过程中,在不增加计算复杂度的前提下,能够有效地剔除错误匹配点并估计出多单应矩阵的初值.结合AML-COV(approximate maximum likelihood with homography covariance)后端优化算法,本文通过仿真数据实验和真实图像实验从客观性能指标和主观视觉效果方面对算法的性能进行了验证分析.实验结果表明,本文提出的多单应矩阵估计方法能够精确、高效、鲁棒地估计出多单应矩阵的值,较好地解决了错误匹配点干扰条件下的多单应矩阵估计问题.展开更多
This paper proposes a low-complexity spatial-domain Error Concealment (EC) algorithm for recovering consecutive blocks error in still images or Intra-coded (I) frames of video sequences. The proposed algorithm works w...This paper proposes a low-complexity spatial-domain Error Concealment (EC) algorithm for recovering consecutive blocks error in still images or Intra-coded (I) frames of video sequences. The proposed algorithm works with the following steps. Firstly the Sobel operator is performed on the top and bottom adjacent pixels to detect the most likely edge direction of current block area. After that one-Dimensional (1D) matching is used on the available block boundaries. Displacement between edge direction candidate and most likely edge direction is taken into consideration as an important factor to improve stability of 1D boundary matching. Then the corrupted pixels are recovered by linear weighting interpolation along the estimated edge direction. Finally the interpolated values are merged to get last recovered picture. Simulation results demonstrate that the proposed algorithms obtain good subjective quality and higher Peak Signal-to-Noise Ratio (PSNR) than the methods in literatures for most images.展开更多
文摘针对错误匹配点干扰条件下的多单应矩阵估计问题,提出了一种对错误匹配点鲁棒的多单应矩阵估计初始化方法.该方法基于特征点对的代数误差和结构相似性约束条件,将错误匹配点剔除策略有机地融合到单应矩阵估计的过程中,在不增加计算复杂度的前提下,能够有效地剔除错误匹配点并估计出多单应矩阵的初值.结合AML-COV(approximate maximum likelihood with homography covariance)后端优化算法,本文通过仿真数据实验和真实图像实验从客观性能指标和主观视觉效果方面对算法的性能进行了验证分析.实验结果表明,本文提出的多单应矩阵估计方法能够精确、高效、鲁棒地估计出多单应矩阵的值,较好地解决了错误匹配点干扰条件下的多单应矩阵估计问题.
基金Supported by Doctor’s Foundation in Natural Science of Hebei Province of China (No.B2004129).
文摘This paper proposes a low-complexity spatial-domain Error Concealment (EC) algorithm for recovering consecutive blocks error in still images or Intra-coded (I) frames of video sequences. The proposed algorithm works with the following steps. Firstly the Sobel operator is performed on the top and bottom adjacent pixels to detect the most likely edge direction of current block area. After that one-Dimensional (1D) matching is used on the available block boundaries. Displacement between edge direction candidate and most likely edge direction is taken into consideration as an important factor to improve stability of 1D boundary matching. Then the corrupted pixels are recovered by linear weighting interpolation along the estimated edge direction. Finally the interpolated values are merged to get last recovered picture. Simulation results demonstrate that the proposed algorithms obtain good subjective quality and higher Peak Signal-to-Noise Ratio (PSNR) than the methods in literatures for most images.
