基于光场成像的数据提取与预处理方法

Data Acquisition and Pre-processing Based on Light Field Photography

光场是空间中同时包含位置和方向信息的四维光辐射场的参数化表示,光场数据的获取为计算成像提供了很多新的发展方向。光场相机能够获取空间四维光场信息,相比传统成像方式多出2个自由度,因而在图像重建过程中,能够获得更加丰富的图像信息。市面上的Lytro Illum相机相对于Lytro1.0相机的成像效果更加丰富,因此利用Lytro Illum光场相机获取四维光场信息,提取出其中的有效光场数据,反演出8bit/pixel的原始四维光场图像数据,并对基于微透镜模型的光场数据进行一系列的算法预处理,从而得到易于理解的标准四维光场矩阵和子光圈图像矩阵,为光场成像技术的数据开发和应用奠定了基础。

Light field is a representation of full four-dimensional radiance of all rays with spatial and angular information in free space,and capture of light field data enables many new development potentials for computational imaging.The light field camera can obtain 4D light field information,which can capture two more variance than traditional camera.Lytro Illum camera has more advantages than Lytro1.0 in aspect of image quality in the market.This paper used Lytro Illum to capture 4D light field information,extracting the valid light field data from the data file in the light field camera.And 8bi/pixel light field image data can be got by decoding and inverting.Then through a series of process to the light field image data based on microlenses model,4D light field data array and many sub aperture pictures can be got,laying agood foundation of the light field data development and application.