编码曝光相机设计与实现

Design and Implementation of Coded Exposure Camera

为了用普通监控相机的资源获取快速运动物体的清晰图像,本文设计了一种基于硬件摄像技术的编码曝光相机。其方法是在CCD时序电路中预设二进制编码序列控制曝光方式,用FPGA技术实现并驱动CCD图像传感器获取图片。然后在ARM的微处理器核中,用反卷积方法对拍摄图片进行去模糊处理。使用编码序列控制曝光方式拍摄的图像能够充分的保留图像的高频信息,这样卷积去模糊能够转变为常态问题,最后得到较高质量的图像。实验表明,对比常规曝光获取的图像,编码曝光方式拍摄的快速运动物体图像信息清晰,效果满意。

A coded exposure camera based on the technology of hardware camera is proposed to get the unambiguous image of fast moving objects. A binary code sequence is pre-set in the sequential circuits of CCD to control the pattern of exposure and the imaging sensor in CCD is driven by FPGA. The deconvolution algorithm is applied in a microprocessor of ARM to deblur the image in the next step. The high frequency information could be preserved by using the code sequence to control the exposure pattern. Therefore, a high quality image could be obtained thanks to the fact that the deconvolution algorithm of deblurring could be converted from an ill-posed problem to a well-posed one. The experiments show that the images taken by the coded exposure camera are clearer and better than the images taken by traditional camera.