【摘要】 针对产品协同设计过程中面临的三维CAD产品模型传输困难问题,提出一种基于最佳线性预测的自由曲线曲面的有损压缩算法。该算法采用最佳线性预测策略,并根据最小均方差准则对自由曲线曲面的控制点列进行预测,同时按用户给定精度进行量化处理,随后对量化值进行熵编码,从而实现自由曲线曲面的有损压缩。实验表明本文算法有较好的压缩效果。更多还原

【Abstract】 A loss compression algorithm about free-form curve and surface in CAD models is proposed to effectively exchange and transmit the model data in collaborative design environment. In this algorithm,the scheme uses a optimal linear predictor to predict the coordinates of the control points in free-form curve or surface according to the theory of Minimum Mean Square Error,coupled with a scalar quantizer which precision appointed by user,follow by bit-plane arithmetic entropy coder. According to the experi-ments,the algorithm presented here is effective for geometry compression.更多还原