邾继贵 邹剑 林嘉睿 叶声华
(天津大学精密测试技术及仪器国家重点实验室 天津 300072)
摘要:在高精度的摄影测量中,图像处理精度对整体测量精度起着至关重要的作用,但成像过程中摄像机对特征点图像的离散化采样,会造成图像与原始信号的失真,从而带来图像处理环节的误差。通过对图像处理过程中特征点总能量、能量分布弥散半径和图像处理窗口的特性分析,并以特征点中心位置,提取误差大小和能量密度函数的标准差之间关系为基础,提出一种针对离散化采样的误差补偿法。该方法仅需标定一次补偿参数,适用于所有摄像机和算法,可显著提升原有图像处理精度。实验证明,对于质心法和高斯拟合法,该补偿法可将图像提取精度提高到0.03pixel。
关键词:测量 图像处理 误差补偿 提取精度
中图分类号 TN247 文献标识码 A doi:10.3788/AOS201232.0912004
收稿日期:2012-03-15;修订日期:2012-04-25。
基金项目:国家自然科学基金重点项目(50735003)和博士点基金(0090032110048)资助课题。(www.xing528.com)
作者简介:邾继贵(1970—),男,博士,教授,主要从事视觉检测、图像处理等方面的研究。Email:jiguizhu@tju.edu.cn
Error-Compensation Algorithm with High-Accuracy for Photographic Image Processing
Zhu Jigui Zou Jian Lin Jiarui Ye Shenghua
(State Key Laboratory of Precision Measurement Technology and Instruments,Tianjin University Tianjin 300072)
Abstract:In the photographic measurement with high precision,the image processing precision plays a crucial role in the overall measurement accuracy.In the process of imaging,the discrete sampling of the feature points by cameras causes a distortion between the received signal and the o-riginal image,which brings errors in image processing.By analyzing the total energy,the disper-sion radius of energy distribution of the feature points and the image processing windows,and based on the relation of the feature point center position,extraction error and the standard deviation of the ennergy density function,an error compensation method is proposed for discrete sampling.Accord-ing to the method,only once calibration of the compensation parameters is needed for any camera and algorithm,and the image processing precision can be improved significantly.The experiments show that for the centroid method and the Gaussian fitting method,the image processing precision can be increased to 0.03 pixel.
Keywords measurement image processing error compensation extraction accuracy
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