Model-Independent Lens Distortion Correction Based on Sub-Pixel Phase Encoding

Sensors

Pengbo Xiong¹  Weibo Wang¹  Shaokai Wang¹  Qixin Ye¹  Shujiao Ye¹ 

[1] Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology, Harbin 150001, China;

关键词: camera calibration;    fringe pattern;    phase encoding;    model-independent method;   

DOI  :  10.3390/s21227465

来源: DOAJ

【 摘 要 】

Lens distortion can introduce deviations in visual measurement and positioning. The distortion can be minimized by optimizing the lens and selecting high-quality optical glass, but it cannot be completely eliminated. Most existing correction methods are based on accurate distortion models and stable image characteristics. However, the distortion is usually a mixture of the radial distortion and the tangential distortion of the lens group, which makes it difficult for the mathematical model to accurately fit the non-uniform distortion. This paper proposes a new model-independent lens complex distortion correction method. Taking the horizontal and vertical stripe pattern as the calibration target, the sub-pixel value distribution visualizes the image distortion, and the correction parameters are directly obtained from the pixel distribution. A quantitative evaluation method suitable for model-independent methods is proposed. The method only calculates the error based on the characteristic points of the corrected picture itself. Experiments show that this method can accurately correct distortion with only 8 pictures, with an error of 0.39 pixels, which provides a simple method for complex lens distortion correction.

【 授权许可】

Unknown