基于脉冲序列光场相机的脉冲间隔时间误差校正方法  

Calibration Method for Time Error of Pulse Interval Based on Pulse⁃Sequence⁃Based Plenoptic Camera

作　　者：马驯川 高志远 徐江涛 MA Xunchuan;GAO Zhiyuan;XU Jiangtao(School of Microelectronics,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology,Tianjin 300072,China)

机构地区：[1]天津大学微电子学院,天津300072 [2]天津市成像与感知微电子技术重点实验室,天津300072

出　　处：《传感技术学报》2023年第6期881-892,共12页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(62134004)。

摘　　要：针对脉冲序列光场相机中存在的脉冲间隔时间误差问题,提出了一种校正的方法。造成脉冲间隔波动的原因包括时间误差和场景变化,基于此将脉冲间隔序列划分为子序列,各子序列中只存在由时间误差造成的波动。利用每个子序列中波动的比例对脉冲间隔时间误差进行校正。在静态场景实验中,光强为400 lux、1700 lux和3500 lux的均匀光图像信噪比分别从14.6225、12.2986和10.5854提高到14.6881、15.7925和15.9416。在动态场景实验中,转速为10 r/min、100 r/min和1000 r/min的转盘图像标准差分别从36.0759、35.1094和34.8353降低到33.8838、32.9750和32.8458。在静态和动态场景中图像缺失的灰度值都得到了补充。实验结果表明,该方法能有效校正脉冲间隔时间误差,提高图像质量。A calibration method is proposed for the time error of pulse interval(TEPI)in the pulse⁃sequence⁃based plenoptic camera.The causes of pulse interval fluctuations include time errors and scene changes,based on which the pulse interval sequence is divided into sub⁃sequences,and only fluctuations caused by time errors exist in sub⁃sequences.The TEPI in each sub⁃sequence is calibrated with the fluctuating proportion.In static scene,the signal⁃to⁃noise ratio of uniform light images with light intensities of 400 lux,1700 lux,and 3500 lux increases from 14.6225,12.2986,and 10.5854 to 14.6881,15.7925,and 15.9416 respectively.In dynamic scene,the standard deviation of turntable images with rotational speeds of 10 r/min,100 r/min,and 1000 r/min decreases from 36.0759,35.1094,and 34.8353 to 33.8838,32.9750,and 32.8458 respectively.Missing gray values are complemented in both static and dynamic scenes.Experimental results show that the proposed method can effectively calibrate the TEPI and improve the image quality.

关 键 词：脉冲序列光场相机 图像去噪 时间误差校正 脉冲间隔 图像重构 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]