【摘要】 在印刷电路板(PCB)的机器视觉检测中需要通过图像拼接来得到整个PCB的图像,传统的图像配准拼接技术由于光照干扰效果不好.用图像的小波分解高频系数去掉反映光照渐变的低能量系数后,可以较好地避免光照不均匀的干扰,分别利用有效垂直高频系数的垂直投影和水平高频系数的水平投影可以快速水平配准和垂直配准,低频部分作拼接的灰度渐变平滑处理.更多还原

【Abstract】 In PCB SMT assembly automatic machine vision inspection,image mosaic is necessary for getting an entire PCB image.Because of inhomogeneous illumination in this engineering image capture,conventional mosaic methods didn’t word well.High frequency coefficients of wavelet decomposition can reflect the contour of the image and that of illumination variety is relative small,so image mosaic based on wavelet decomposition can be robust for PCBA inspection.Using projection of wavelet decomposition coefficients to replace mutual correlation can simplify the calculation from 2D to 1D.Experimental results show this approach is effective,robust and quick.更多还原