计算机应用 ›› 2013, Vol. 33 ›› Issue (11): 3209-3212.

• 多媒体处理技术 • 上一篇    下一篇

基于光栅投影序列图像融合的倾斜校正算法

刘旭,巫玲,陈念年,范勇,段晶晶,任新宇,夏菁菁   

  1. 西南科技大学 计算机科学与技术学院,四川 绵阳 621010
  • 收稿日期:2013-05-31 修回日期:2013-07-22 出版日期:2013-11-01 发布日期:2013-12-04
  • 通讯作者: 刘旭
  • 作者简介:刘旭(1989-),女,四川资阳人,硕士研究生,主要研究方向:机器视觉测量、图像处理;巫玲(1982-),女,四川遂宁人,讲师,硕士,主要研究方向:视觉测量、图像分割;陈念年(1977-),男,四川汉源人,副教授,硕士,主要研究方向:机器视觉、图像处理;范勇(1972-),男,重庆忠县人,教授,博士,主要研究方向:机器视觉、图像理解;段晶晶(1989-),女,河南驻马店人,硕士研究生,主要研究方向:机器视觉;任新宇(1988-),男,四川泸州人,硕士研究生,主要研究方向:机器视觉;夏菁菁(1987-),女,四川广安人,硕士研究生,主要研究方向:机器视觉。
  • 基金资助:
    四川省科技创新苗子工程资助项目;制造过程测试技术-省部共建教育部重点实验室(西南科技大学)开放基金资助

Tilt correction algorithm based on aggregation of grating projection sequences

LIU Xu,WU Ling,CHEN Niannian,FAN Yong,DUAN Jingjing,REN Xinyu,XIA Jingjing   

  1. School of Computer Science and Technology, Southwest University of Science and Technology, Mianyang Sichuan 621010, China
  • Received:2013-05-31 Revised:2013-07-22 Online:2013-12-04 Published:2013-11-01
  • Contact: LIU Xu

摘要: 针对现有校正算法因抖动等因素存在的校正误差问题,提出了一种基于光栅投影的倾斜校正算法。通过分析连续频率变化的条纹图像序列,构建像素点位置与像素斜率的转换模型;然后利用光栅图像倾斜角度与像素斜率变化关系,使用三角法计算出倾斜角;最后实现倾斜校正。实验结果表明,该算法可有效检测出[-90°,90°]范围内的倾斜角度,准确率为99%。与现有的Hough变换等倾斜校正算法相比,所提算法检测精确度、准确率明显提高。

关键词: 光栅投影, 倾斜校正, Hough变换, 最小二乘法, 像素斜率

Abstract: In view of the correction error problem which is caused by some factors such as dithering, the authors presented a new optical tilt correction method based on grating projection. The method was based on the analysis of each pixel of the data array in a sequence of fringe patterns having multiple frequencies, and setup model for pixel coordinates and pixel-slope. Then skew angles of fringes were calculated by trigonometry with the relationship between tilt angle and pixel-slope. At last, tilt correction was realized. The experimental results show that, the algorithm is capable of accurately detecting angle within the range [-90°,90°],accuracy is 99%. Compared with other algorithms such as Hough transform, the proposed algorithm improves precision and accuracy significantly.

Key words: grating projection, tilt correction, Hough transform, least square method, pixel slope

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