A distortion field-calibrating method based on feature parallel lines of image

作者：Wang Gui Ping^*; Wang Hui Feng; Liu Pan Zhi; Ju Yong Feng

来源：Acta Photonica Sinica, 2014, 43(1): 111001.

DOI：10.3788/gzxb20144301.0111001

• Distortion calibration
• Distortion parameters
• Engineering systems
• Image measurements
• Parallel line
• Perspective distortion
• Radial distortions
• Target recognition

Considering the effect on the image measurement system, a distortion calibration method was designed after analyzing the model of lens distortion. The method consists of two steps, namely calibration on the non-linear distortion and calibration on the perspective distortion. In the first step, the non-linear distortion coefficients of the lens were obtained form drawing the multi feature straight lines and straightening the feature lines. With these coefficients, the non-linear of the image was calibrated, and an image without any non-linear distortion was achieved. In the second step, the distortion parameters were obtained through fitting the parallel-line feature of the image. With these parameters, the perspective distortion was calibrated, and an image without perspective was achieved.The experiments and simulations show that the radial and the perspective-distortion relatively error can be reduced to 5% with this method, which can be used in many similar engineering systems based on image measurement and target recognition in non-fixed locations.

• 出版日期2014