数据库样本 meaning in English

database sample

Because the police fingerprint database is very large and the fingerprint image is often noisy , we paid more efforts on extraction of singular point from the noisy image and improve the fingerprint classification speed . we have obtained some result in the following research areas : 1 ) fingerprint extraction . we extract fingerprint image by two steps : coarse extraction and fine extraction
针对公安指纹数据库样本数量多（一般都在万枚以上），指纹图象质量相对比较差的特点，我们把研究重点放在从差质量的指纹图中准确可靠地提取奇异点特征以及提高分类速度上，并在以下几个方面取得了一定的研究成果： 1 ）指纹分割。