为了改进图像恢复效果,减少运行时间,提出了一种基于改进的多层小波分解压缩感知图像的处理方法。该方法利用小波变换对图像进行多层分解,根据小波域高频系数分布特点通过高斯矩阵随机观测,利用正交匹配追踪算法（OMP）恢复高频系数,最...为了改进图像恢复效果,减少运行时间,提出了一种基于改进的多层小波分解压缩感知图像的处理方法。该方法利用小波变换对图像进行多层分解,根据小波域高频系数分布特点通过高斯矩阵随机观测,利用正交匹配追踪算法（OMP）恢复高频系数,最后通过小波逆变换重构图像。实验结果表明,本文的算法优于传统算法,峰值信噪比（PSNR）平均提高了4~6 d B,运行时间缩短了1~2个量级,为物联网、无线传输技术提供了更好的可能性。展开更多
A gamma-ray Computed Tomography(CT)technique based on MATLAB has been developed,and its potential for the application of multiphase flow detection has been demonstrated with simulation results.Aiming to improve the re...A gamma-ray Computed Tomography(CT)technique based on MATLAB has been developed,and its potential for the application of multiphase flow detection has been demonstrated with simulation results.Aiming to improve the real time performance,we design a CT system with fixed sources and limited detectors.By dissecting the imaging region with Delaunay triangulation method,the algebraic reconstruction algorithm and simultaneous multiplicative algebraic reconstruction algorithm are implemented respectively to reconstruct cross-sectional images.The resultant images can be utilized to identify flow regimes or extract characteristic parameters.展开更多
A method of micro-scanning location adaptive calibration was proposed, which was real- ized by the digital image micro-displacement estimation. With geometric calculation, this calibration method used the displacement...A method of micro-scanning location adaptive calibration was proposed, which was real- ized by the digital image micro-displacement estimation. With geometric calculation, this calibration method used the displacement estimation of two thermal microscope images to get the size and direc- tion of each scanning location calibration angle. And each location calibration process was repeated according to the offset given by the system beforehand. The comparison experiments of sequence oversampling reconstruction before and after the micro-scanning location calibration were done. The results showed that the calibration method effectively improved the thermal microscope imaging qual- ity.展开更多
文摘为了改进图像恢复效果,减少运行时间,提出了一种基于改进的多层小波分解压缩感知图像的处理方法。该方法利用小波变换对图像进行多层分解,根据小波域高频系数分布特点通过高斯矩阵随机观测,利用正交匹配追踪算法（OMP）恢复高频系数,最后通过小波逆变换重构图像。实验结果表明,本文的算法优于传统算法,峰值信噪比（PSNR）平均提高了4~6 d B,运行时间缩短了1~2个量级,为物联网、无线传输技术提供了更好的可能性。
基金supported by National Natural Science Foundation of China(No.60820106002,50937005,60532020)
文摘A gamma-ray Computed Tomography(CT)technique based on MATLAB has been developed,and its potential for the application of multiphase flow detection has been demonstrated with simulation results.Aiming to improve the real time performance,we design a CT system with fixed sources and limited detectors.By dissecting the imaging region with Delaunay triangulation method,the algebraic reconstruction algorithm and simultaneous multiplicative algebraic reconstruction algorithm are implemented respectively to reconstruct cross-sectional images.The resultant images can be utilized to identify flow regimes or extract characteristic parameters.
基金Supported by Beijing Natural Science Foundation(4062029)Ministry of Science and Technology Innovation Foundation for Small and Medium-sized Enterprises (06KW1051)North China University of Technology Dr. Start-up Fund for 2013
文摘A method of micro-scanning location adaptive calibration was proposed, which was real- ized by the digital image micro-displacement estimation. With geometric calculation, this calibration method used the displacement estimation of two thermal microscope images to get the size and direc- tion of each scanning location calibration angle. And each location calibration process was repeated according to the offset given by the system beforehand. The comparison experiments of sequence oversampling reconstruction before and after the micro-scanning location calibration were done. The results showed that the calibration method effectively improved the thermal microscope imaging qual- ity.
