激光多灰度图像标刻中自适应纹理模板及图像矫正算法的研究  

Study of Self-adaptive Texture Template and Distortion Correction in Multi-Gray Laser Marking System

作　　者：黄立华[1] 刘晓东[1] 齐红基[2] 

机构地区：[1]华中科技大学激光技术与工程研究院,湖北武汉430074 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2004年第4期452-456,共5页Chinese Journal of Lasers

摘　　要：多灰度图像的激光标刻是目前激光标刻中研究最为活跃的内容之一 ,但目前多灰度标刻的软件主要存在标刻后图像不逼真、缺乏层次感且对失真图像矫正效果不理想等缺点 ,在利用 5× 5固定模板实现图像多灰度标刻的基础上 ,考虑到图像中相邻像素点的灰度关系 ,对除边缘像素点外的每个像素点在 3× 3窗口范围内进行差分运算 ,提取该像素点在局域内的纹理特征 ,并据此来选择模板实现多灰度图像标刻。另外 ,利用拉格朗日二次抛物线插值法对输出图像的位置坐标进行矫正 ,矫正公式中x方向和y方向的最大畸变量分别为 80和 90 ,基本上能消除双振镜扫描引起输出图像几何畸变的影响。标刻的图像能很好地表现原图像的信息 ,且实现算法简单 ,图像质量得到了明显改善。Recently, multi gray laser mark is one of the most interesting fields in laser mark. But, the software used in multi gray laser mark can′t produce living, well bedded, orthoscopic image. In this paper, based on multi gray laser mark and 5×5 evenly distributed template, the gray relationship of adjacent pixels is considered. Except for marginal pixels, differential operation has been used to every pixels across the window of the size of 3×3 pixels, then texture characteristics are discriminated locally. Based on the local texture in images, corresponding templates are selected. Furthermore, the distortion for dual galvanometer scanning is corrected with the method of Lagrange second degree parabola interpolation, where the value of distortion in the direction of x and y axes are 80, 90, respectively. The aesthetic appearance of marked images is improved greatly removing the effect of trace of matchboard and distortion of dual galvanometer scanning.

关 键 词：激光技术 激光标刻 自适应纹理模板 畸变矫正 双振镜扫描 

分 类 号：TN249[电子电信—物理电子学]