基于DaVinci技术数字对焦重构算法研究与实现

Implementation of digital refocusing reconstruction algorithm based on DaVinci technology

数字对焦光场成像技术是一种新型的计算成像技术,利用光学手段获取四维光场信息,通过重构二维空间信息和一维深度信息,达到先拍摄后对焦的目的。研究光场图像数字对焦重构算法,利用TI公司推出的DaVinci系列处理器DM6467对数字对焦重构算法进行硬件仿真,通过改变对焦系数,得到不同深度的对焦图像。同时,根据C64x+DSP核的特点,通过循环分解、项目级优化等方法对代码进行一定的优化,使代码执行效率提高了18倍左右,对实现光场成像系统的小型化和实时化具有重要的指导意义。

The digital refocusing light-field photography is a new kind of computational photography,which capturs four-dimensional light-field information by optical methods and reconstructs two-dimensional spatial information and one-dimensional depth information in object space to photograph focused at different depths.Based on the research of digital refocusing reconstruction algorithms,the hardware implementation of digital refocusing algorithms for reconstruction of light-field images is presented.The DM6467 processor,one of TI's DaVinci series,is utilized as the processing platform.Images at different depths are reconstructed by changing refocusing coefficient.Moreover,code optimization methods such as cyclic decomposition,project-level optimization and so on are proposed according to the C64x+dsp core,which improves the code excutive efficiency by a factor of 18.It has a instructive significance for realizing a portable and real-time light-field imaging system in the future.