摘要
针对非理想身份证图像中存在的斑点噪声,利用小波变换降噪的特点,将身份证图像进行小波分解,然后分别采用硬阈值、软阈值和小波指数函数三种方法进行降噪处理。结果表明小波指数方法是较优降噪方法,可以有效地降低原图像的斑点噪声并保留图像细节。
As for the inherent speckle noises in the ID card image,by using the wavelet transform characteristics,the ID card image is discomposed to the wavelet,trod the its coefficients are shrunk with three methods of hard threshold,soft ＂threshold and wavelet exponential function differently for the image de - noising. The result indiea,tes that the wavelet exponential is the effective function rnethod,in which the speckle noise in the original image is removed effectively and at the same time the image details are reserved.
出处
《电脑开发与应用》
2006年第2期37-38,41,共3页
Computer Development & Applications
关键词
小波变换
身份证图像
阈值降噪
小波指数降噪
wavelet transform, ID card image, threshold de - noising, wavelet exponential de - noising
