作　　者： ; ;

机构地区： 暨南大学理工学院物理学系

出　　处： 《计算机工程与应用》 2005年第4期75-78,216,共5页

摘　　要： 文中研究了基于离散余弦变换的光栅投影图的压缩。首先介绍了三维形貌测量的光栅投影图,及其需要进行压缩的原因。接着讨论了可用于图像压缩的离散余弦变换技术,推导出对于光栅图进行离散余弦变换只保留第一列或第一行系数就可以完整重构光栅图的结论。利用此结论创建用于压缩的二值掩模矩阵,并对光栅投影图之一的位相图进行基于离散余弦变换的压缩。实验结果表明此方法能有效地压缩位相图,使用压缩后还原的位相图解调出来的物体形貌信息能得到有效的保留。 This paper studies the grating projective images compression technology based on Discrete Cosine Transformation(DCT).First it introduces grating projective images which are used in three-dimentioned shape measurement and the reason that people need to compress these images.Then it introduces the Discrete Cosine Transformation technology which could compress images,and draws the conclusion that people can use the first column or the first row of DCT coefficient matrix to reconstruct the grating images.Using this conclusion and considering the characteristic of grating projective images,the paper creates the 0-1 value mask to compress the DCT coefficient matrix.The experiment result shows that this method could compress the phase images effectively.Decompressing the images and demodulating the phase,the shape information could be retained effectively.

关 键 词： 离散余弦变换 三维形貌检测 光栅投影图 四步相移法 相关系数

领　　域： [自动化与计算机技术] [自动化与计算机技术]