目前,大多数图像取证方法对彩色图像的处理是将其转换为灰度图像,从而导致了彩色图像的颜色信息不能被有效且充分地利用.针对此问题提出一种基于四元数主成分分析(quaternion principal component analysis, QPCA)的复制粘贴篡改检测方...目前,大多数图像取证方法对彩色图像的处理是将其转换为灰度图像,从而导致了彩色图像的颜色信息不能被有效且充分地利用.针对此问题提出一种基于四元数主成分分析(quaternion principal component analysis, QPCA)的复制粘贴篡改检测方法.该方法充分利用了彩色图像的各个颜色通道及它们之间的相关性,能够有效提高篡改区域的识别度.运用基于图像块的检测方法,首先将图像分块后对所有块进行QPCA计算以提取特征,然后用字典排序获取相似块的移位向量,最后根据移位向量频数与阈值的比较确定篡改区域.实验结果表明,所提方法的误检漏检率低于现有方法,检测准确率有较大提高.展开更多
A novel method for developing a reliable data driven soft sensor to improve the prediction accuracy of sulfur content in hydrodesulfurization(HDS) process was proposed. Therefore, an integrated approach using support ...A novel method for developing a reliable data driven soft sensor to improve the prediction accuracy of sulfur content in hydrodesulfurization(HDS) process was proposed. Therefore, an integrated approach using support vector regression(SVR) based on wavelet transform(WT) and principal component analysis(PCA) was used. Experimental data from the HDS setup were employed to validate the proposed model. The results reveal that the integrated WT-PCA with SVR model was able to increase the prediction accuracy of SVR model. Implementation of the proposed model delivers the best satisfactory predicting performance(EAARE=0.058 and R2=0.97) in comparison with SVR. The obtained results indicate that the proposed model is more reliable and more precise than the multiple linear regression(MLR), SVR and PCA-SVR.展开更多
文摘目前,大多数图像取证方法对彩色图像的处理是将其转换为灰度图像,从而导致了彩色图像的颜色信息不能被有效且充分地利用.针对此问题提出一种基于四元数主成分分析(quaternion principal component analysis, QPCA)的复制粘贴篡改检测方法.该方法充分利用了彩色图像的各个颜色通道及它们之间的相关性,能够有效提高篡改区域的识别度.运用基于图像块的检测方法,首先将图像分块后对所有块进行QPCA计算以提取特征,然后用字典排序获取相似块的移位向量,最后根据移位向量频数与阈值的比较确定篡改区域.实验结果表明,所提方法的误检漏检率低于现有方法,检测准确率有较大提高.
文摘A novel method for developing a reliable data driven soft sensor to improve the prediction accuracy of sulfur content in hydrodesulfurization(HDS) process was proposed. Therefore, an integrated approach using support vector regression(SVR) based on wavelet transform(WT) and principal component analysis(PCA) was used. Experimental data from the HDS setup were employed to validate the proposed model. The results reveal that the integrated WT-PCA with SVR model was able to increase the prediction accuracy of SVR model. Implementation of the proposed model delivers the best satisfactory predicting performance(EAARE=0.058 and R2=0.97) in comparison with SVR. The obtained results indicate that the proposed model is more reliable and more precise than the multiple linear regression(MLR), SVR and PCA-SVR.
