讨论了小波变换在复合材料预制件花节长度测量中的应用技术，建立了花节长度自动测量系统。该系统基于小波变换的多尺度分析，通过合理选择小波基，对预制件表面图象进行处理,可以得到理想图象的边缘信息。选用纹理模板，对处理后图象利用相关算法计算图象匹配点输出，再通过匹配点的距离可以测量预制件的花节长度。该方法与其他滤波方法的比较，证实了小波变换可以保持预制件图象的边缘特征。实验结果说明，该系统的测试结果与手工测量结果相吻合，从而还证实了小波变换用于复合材料预制件花节长度测量是可行的。

The paper discussed application technology about composite material preform stitch measured using wavelet transform. The system is rested on the multi scale analysis of wavelet transform. By selecting appropriate wavelet basis, the surface image of composite material preform may be processed and show ideal information of image edge. When a texture template selected, match point about iamge will be make out by revolution algorithm. Through measuring distance of match point, the stitch of perform may be brought out. When compared with other filtering mode, it proves that wavelet transform can reduce noise while preserving image edge features. The experiments show that tested results are consisted with handiwork. This system proved that it is possible for stitch of composite material preform will be analyzed using wavelet transform.