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基于录制环境检测的数字音频取证研究 被引量:2
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作者 何少岩 陈蕉容 陈舜儿 《计算机工程与设计》 CSCD 北大核心 2013年第12期4142-4145,共4页
为解决数字音频伪造和篡改的检测问题,针对数字音频取证中录制环境检测,提出一种基于梅尔倒谱系数(MFCC)结合小波包分析的特征提取算法。算法用以提取音频的频域统计特性,结合时域特征构造特征集合,运用基于期望最大化(EM)的机器训练方... 为解决数字音频伪造和篡改的检测问题,针对数字音频取证中录制环境检测,提出一种基于梅尔倒谱系数(MFCC)结合小波包分析的特征提取算法。算法用以提取音频的频域统计特性,结合时域特征构造特征集合,运用基于期望最大化(EM)的机器训练方法对音频录制地点进行分类和判断,实现数字音频录制环境的取证。实验结果表明,该算法能够较好的区分不同环境下的音频特性,纯净分类(无其他环境下的音频混入聚类组)最高可达98%。 展开更多
关键词 数字音频取证 环境监测 梅尔倒谱系数 期望最大化 小波包
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Analysis of rice paper's morphological features based on multispectral imaging technology
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作者 何少岩 陈舜儿 +1 位作者 翟浩田 刘伟平 《Journal of Measurement Science and Instrumentation》 CAS 2014年第4期46-51,共6页
Computer forensics and identification for traditional Chinese painting arts have caught the attention of various fields. Rice paper's feature extraction and analysis methods are of high significance for the rice pape... Computer forensics and identification for traditional Chinese painting arts have caught the attention of various fields. Rice paper's feature extraction and analysis methods are of high significance for the rice paper is an important carrier of traditional Chinese painting arts. In this paper, rice paper's morphological feature analysis is done using multi spectral imaging technology. The multispectral imaging system is utilized to acquire rice paper's spectral images in different wave- length channels, and then those spectral images are measured using texture parameter statistics to acquire sensitive bands for rice paper's feature. The mathematical morphology and grayscale statistical principle are utilized to establish a rice paper's morphological feature analytical model which is used to acquire rice paper' s one-dimensional vector. For the purpose of eval- uating these feature vectors' accuracy, they are entered into the support vector machine(SVM) classifier for detection and classification. The results show that the rice paper's feature is out loud in the spectral band 550 nm, and the average classifi- cation accuracy of feature vectors output from the analytical model is 96 %. The results indicate that the rice paper's feature analytical model can extract most of rice paper's features with accuracy and efficiency. 展开更多
关键词 rice paper multispectral imaging texture analysis mathematical morphology
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