| 角膜曲率测量中自动识别的对焦评价 |
| |
| 引用本文： | 方丽萍,陈兆学,陈鹏,王成,张大伟.角膜曲率测量中自动识别的对焦评价[J].光学技术,2019,45(2):218-223. |
| |
| 作者姓名： | 方丽萍 陈兆学 陈鹏 王成 张大伟 |
| |
| 作者单位： | 上海理工大学医疗器械与食品学院生物医学光学与视光学研究所,上海,200093;上海理工大学光电信息与计算机工程学院上海市现代光学系统重点实验室教育部光学仪器与系统工程研究中心,上海,200093 |
| |
| 摘 要： | 角膜曲率测量一般是采用视标成像的方法得到角膜的反射像后,通过对反射像的再成像间接得到角膜的曲率半径。为了实现对角膜曲率测量图像的对焦判断,在简化角膜曲率测量系统的基础上,对获取的图像对焦算法进行研究。对角膜曲率测量图像的六个测试光标分别进行像素统计,初步判别过度离焦的状态。对角膜曲率测量图像进行四方向Sobel算子的卷积运算,对得到的边缘增强图像进行对数灰度级像素统计,得到对焦评价值。将该算法与Tenengrad函数、方差函数和单一对数灰度级像素统计评价函数算法做对比实验,评价该算法的可行性。实验结果表明,该对焦评价函数具有良好的精确度、单峰性、灵敏度和无偏性,对细节信息较少、结构简单的图像的对焦评价方面有应用前景。
|
| 关 键 词： | 图像处理 角膜图像 对焦评价 对数灰度级 四方向Sobel算子 |
Focus evaluation for automatic recognition in corneal curvature measurement |
| |
| FANG Liping,CHEN Zhaoxue,CHEN Peng,WANG Cheng,ZHANG Dawei.Focus evaluation for automatic recognition in corneal curvature measurement[J].Optical Technique,2019,45(2):218-223. |
| |
| Authors: | FANG Liping CHEN Zhaoxue CHEN Peng WANG Cheng ZHANG Dawei |
| |
| Institution: | (Institute of Biomedical Optics and Optometry, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;Institute of Biomedical Optics and Optometry, Engineering Research Center of Optical Instrument and System in Ministry of Education, Shanghai Key Laboratory of Modem Optical System, School of Optical Electrical and Computer Engineering University of Shanghai for Science and Technology, Shanghai 200093, China) |
| |
| Abstract: | FANG Liping;CHEN Zhaoxue;CHEN Peng;WANG Cheng;ZHANG Dawei(Institute of Biomedical Optics and Optometry, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;Institute of Biomedical Optics and Optometry, Engineering Research Center of Optical Instrument and System in Ministry of Education, Shanghai Key Laboratory of Modem Optical System, School of Optical Electrical and Computer Engineering University of Shanghai for Science and Technology, Shanghai 200093, China) |
| |
| Keywords: | image processing corneal image focus measures logarithmic grayscale four-direction Sobel operator |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
