为了解决机器视觉测量中,由被测物体表面结构差异或反射率不同而引起的视觉质量问题,提出一种新型的基于投影仪-相机系统的自适应照明方法。该方法采用双频光栅条纹,可以结合高低频相移方法的特点进行相位解包,因而比传统单一频率的条纹进行解包相位精度更高,能够提升测量过程中所必须获取深度值的精度。同时,该方法利用彩色图像多通道的特点,不同通道处理不同频率的条纹光栅,相较于黑白图像测量的方法速度提升一倍。所提出的双频相移自适应照明方法,可以满足机器视觉测量中的高精度高速度需求,提升机器视觉在线检测的能力,可以广泛应用于工业检测领域与图像识别领域。

In order to solve the visual quality problem caused by the different structure or reflectivity of the object surface, a new adaptive illumination method based on camera-projector system is proposed. By adopting the dual-frequency grating fringes, both high and low frequency phase shift characteristics can be combined and used for unwrapping phase, which is more accurate than the traditional single frequency fringe unwrapping method. Thus, the necessary depth accuracy is improved in the measured process. Furthermore, different channels deal with different frequencies of fringe gratings by using the characteristic of the multiple channels of colored images. This method is twice as fast as the black-and-white image measurement method. Therefore, the dual-frequency phase shift adaptive method can meet the requirement of high speed and accuracy in machine vision measurement, and thus improves the on-line detection ability and can be widely used for industrial detection and image recognition.