自动验光仪中图像处理与调焦准确性的研究  

Study on the image processing and focusing accuracy for auto refractometer

作　　者：姚铖[1] 隋成华[1] 魏高尧[1] 王河林[1] 石文渊[1] 

机构地区：[1]浙江工业大学理学院,浙江杭州310023

出　　处：《光学仪器》2012年第6期10-13,共4页Optical Instruments

基　　金：浙江省重大科技专项资助项目(2011C11048);浙江省教育厅资助项目(Y201121906)

摘　　要：图像清晰度评价函数可以反映调焦系统的调焦准确性。为了验证所选择的评价函数满足调焦准确性的要求,现选择在不同调焦位置拍摄图像并进行处理,找出最佳成像位置,然后利用调焦透镜的移动量与屈光度的关系计算出屈光度,与实际使用的模拟眼比较并计算误差。通过对不同屈光度的模拟眼分别测量,最终结果表明:该评价函数能够较好地满足调焦的准确性要求。The evaluation function of image clarity can reflect the focusing accuracy of the focusing system. To verify whether the chosen evaluation function can meet the demand offocusing accuracy, the images captured in different positions are processed to find out the best one, then the diopter by the relationship between the diopter and the movement of focusing lens is calculated and compared with the real diopter used. Through the measurement of different artificial eyes with different diopters, the final results show that the evaluation function meets the demand of focusing accuracy very well.

关 键 词：自动验光仪 调焦光学系统 图像处理 屈光度计算 

分 类 号：TH773[机械工程—仪器科学与技术]