CAJ | 학술논문

　　为了提高光栅表面缺陷图像的去噪效果，便于后续缺陷图像检测，通过改进阀值和阀值函数来实现对光栅表面缺陷图像的小波去噪。通过引入一个收缩因子来改进原阀值，得到各分解尺度上的新阀值，利用新阀值函数对各尺度上的小波高频系数进行阀值处理，经过小波逆变换得到去噪后的光栅表面缺陷图像。实验结果表明，该方法与硬、软阀值法相比，提高了峰值信噪比，较好地保留了缺陷图像的边缘等细节信息，增强了边缘对比度，且图像更平滑。
　　위료제고광책표면결함도상적거조효과，편우후속결함도상검측，통과개진벌치화벌치함수래실현대광책표면결함도상적소파거조。통과인입일개수축인자래개진원벌치，득도각분해척도상적신벌치，이용신벌치함수대각척도상적소파고빈계수진행벌치처리，경과소파역변환득도거조후적광책표면결함도상。실험결과표명，해방법여경、연벌치법상비，제고료봉치신조비，교호지보류료결함도상적변연등세절신식，증강료변연대비도，차도상경평활。
To improve the de-noising effects for circular grating surface defect image and easily detect defect image, improved threshold value and threshing function are proposed for the de-noising of circular grating surface defect image by wavelet. A new threshold on the respective scale decomposition can be obtained by introducing a shrinkage factor to improve the original threshold value. Wavelet high frequency coefficients on the respective scale decomposition are processed by new threshing func-tion. The denoised circular grating surface defect image is obtained by wavelet inverse transformation. Experimental results show that compared to the hard and soft threshold method, this method has improved the PSNR, well keeps the defect image edges and other details, enhances the edge contrat, and obtains a smoother image.