卷帘式快门CMOS数字相机测速系统标定技术

为了实现对高速公路车辆速度进行限制, 建立了基于卷帘式CMOS（Complementary Metal Oxide Semiconductor）图像传感器的相机测速系统, 并对该系统采用的标定技术、 测速算法等进行了研究。卷帘式快门数字相机测量速度是利用卷帘式快门曝光, 具有一定的延时, 对运动物体拍摄会产生一定的畸变, 通过对图像的畸变部分进行图像处理和计算, 即可得到运动物体的速度参数。根据相机成像的几何原理, 分析了相机的标定原理, 根据相机测速时的特点, 提出了简单、 有效的标定方法。进一步研究了相机标定和测速的实验方法和步骤, 进行了标定及测速实验。经实验验证： 利用卷帘式快门CMOS数字相机方法对运动目标测速值较精确, 误差在2.5%以内。基本满足高速公路相机测速系统精度要求。

Calibrating Technology of Speed Measurement System Based on CMOS Digital Camera with Rolling Shutter

In order to limit the speed of vehicle on highway, an speed measurement system based on CMOS（Complementary Metal Oxide Semiconductor）digital camera with rolling shutter is established and its calibrating technology and speed measurement algorithms are investigated. Rolling shutter digital camera's speedmeasurement is that using exposure of rolling shutter with a certain delay, producing a certain distortion when take photo of the moving object, and exploiting the image processing techniques to process and calculate the part of the image distortion, then get the speed parameters of the moving object. The camera calibration is the foundation and prerequisite for
CMOS digital camera measuring speed of the moving object. Based on the principle of the camera imaging, the text analyzes the camera calibration theory. According to the characteristics of the camera's measuring speed, the calibration method fit for speed measurement. Following introduces the methods and procedures of camera calibration experiment, then finishes the experiments. Experimental results indicate that the error of the speed measurement system using this calculation method is within 2.5%. It can satisfy the speed measurement system.