基于三次B样条插值的形状错误隐藏算法

Spatial shape error concealment method based on cubic B-spline interpolation

分析了基于Bézier插值的视频对象形状错误隐藏方法的不足,即计算附加控制点的过程复杂,隐藏结果受附加控制点影响大。针对这一问题,提出了一种基于三次B样条插值的错误隐藏算法。对三次B样条插值的矩阵公式进行了改进,保证目标轮廓的平滑性;直接对已知轮廓点插值,克服了传统方法的不足。与传统方法对比实验表明,新算法简单易实现,有较好的实用意义。

The deficiencies of traditional shape error concealment method based on Bezier curve were analyzed, which included the complex process of calculating additional control points and the influence of additional control points to accuracy. In this paper, an error concealment method was proposed based on cubic B-spline interpolation （CBI）. The matrix formula of CBI was modified to smooth the object＇ s boundary. The known boundary points were interpolated directly and no additional control points needed. Experimental results show that the proposed method is simple and easy implement, and is of great promise in practice.