摘要
由于图像传感器的采样不足,在指纹仪成像质量检测中高频区域出现了混频现象。为了避免混频,提高指纹仪的成像质量,提出了指纹仪出现混频的区域。描述了指纹采集仪出现的混频现象,通过理论分析和计算,获得了指纹仪的混频区域。对实验得到的图像所出现的混频区域进行了测量,测量结果与理论计算结果基本一致。
Because of subsample effect of imaging sensor,the aliasing phenomenon of fingerprint scanner is presented in the image quality test.For avoiding aliasing and boosting the image quality in a acceptable region,the aliasing area is proposed.The aliaing phenomenon is described and the theoretical aliasing region is proposed after analysing and calculation.The measured result of the image is agreeed with theoretical analysis.
出处
《光学技术》
CAS
CSCD
北大核心
2009年第6期924-926,930,共4页
Optical Technique
关键词
成像光学
指纹采集仪
成像质量测试
混频
莫尔条纹
imaging optics
fingerprint scanner
image quality test
aliasing phenomenon
moire fringe
