关键词: 计算机应用, 镜头畸变, 网格校正, 图形处理单元, 计算统一设备架构

Abstract:

Using short focal length lens to get the information of wide-field view always leads to image distortion due the existence of optics distortion. Calibration with optic method is demonstrated quite difficult and expensive. To solve these problems, this paper proposes a new algorithm to calibrate the distortion of optic system using digital image processing technique, called GPUBased Grid Calibration (GBGC) algorithm. On the bases of programmable Graphics Processing Unit (GPU), which adopts CUDA technology, this algorithm solves several lens distortion coefficients, such as radial distortion, centrifugal distortion and thinprism distortion and so on, by standard grid model. This algorithm can maximize the calibration precision and calibration speed, moreover, accomplish high quality realtime calibration. Experiment results demonstrate the feasibility and efficiency of this algorithm, and the calibration precision extends to sub-pixels.

Key words: computer application, lens distortion, grid calibration, graphics process unit, compute unified device architecture