应用光谱成像技术去除指纹干扰背景的方法研究

摘要

ABSTRACT:ObjectiveTo study the method of removing the background interference of the developed fingerprint using spectral imaging technology.MethodsMulti-spectral images of two developed ifngerprint samples disturbed by the background pattern were acquired, whose spectra ranges from 400 nm to 720 nm, with the sampling interval of 10 nm. Two speciifc spectral images were selected from the data cube by comparing the spectra of the ifngerprint and the background or observing the spectral images directly, then the division of two images was performed and the resulted image was enhanced by linear stretching, ifnally the enhanced ifngerprint image with a weakened background was obtained.ResultsThe background pattern interfered with the developed ifngerprint on Renminbi was effectively removed, and so was the striped background disturbing the developed ifngerprint on envelope. In another word, the ifngerprints were signiifcantly enhanced.Conclusion The method of removing the background interference by division of two featured spectral images based on visible spectral imaging technology is very suitable for the case of enhancing the developed fingerprint on absorbent object, but the background is required to have a consistent color hue or little color change.%目的：研究光谱成像技术去除指纹干扰背景的方法。方法利用可见光光谱成像仪对受背景干扰严重的两例显现汗液指纹检材采集多光谱图像，光谱范围从400～720 nm，采样步长为10 nm，通过比较指纹和背景的光谱或直接观察图像寻找两幅特征谱段的图像，将两幅图像做除法运算，然后再进行图像线性拉伸增强显示，获得增强指纹、弱化干扰背景的效果。结果有效地去除了人民币上显现指纹的干扰背景图案，同时，弱化了信封上干扰茚三酮显现处理指纹的条纹背景，指纹图像得到明显增强。结论基于可见光光谱成像技术，采用两个特征谱段图像作除法运算去除背景干扰的方法适合于渗透性客体上显现的汗液指纹的增强，但干扰背景颜色色调应均一，即背景颜色需变化不大。