In this paper, a hiding method is proposed to store vast quantities of image information based on... more In this paper, a hiding method is proposed to store vast quantities of image information based on PCA. A sequence eigenimages of objects are obtained by using PCA method. Then, wavelet coefficients of eigenimages are embedded into the wavelet domain of the carrying image. When the hiding information is extracted, we can take advantage of the decomposition coefficients to reconstruct the objects. The proposed method does not store the object images directly, but store the eigenimages which contain information of the objects. The experimental results show that the features of object are effectively embedded into the carrying image, and the proposed algorithm has a high capacity.
Journal of the Optical Society of America. A, Optics, image science, and vision, 2014
The propagation characteristics of an off-axis high-order cylindrical vector beam (OHCVB) are stu... more The propagation characteristics of an off-axis high-order cylindrical vector beam (OHCVB) are studied in this paper. The analytic expressions for the electric field and intensity distribution of the OHCVB propagating in free space are presented, to our knowledge for the first time. The transverse intensity of the OHCVB, different from that of the input Gaussian beam, does not have an axially symmetric distribution, owing to a slight dislocation between the polarization singularity located in the vector field generator and the center point of the Gaussian beam. Numerical results show that the intensity distribution during propagation strongly depends on the propagation distance, dislocation displacement, and topological charge. Accompanied by beam expansion, the intensity distribution of the OHCVB tends to eventually become steady, and the dark core of the vector beam will disappear gradually during the process of propagation. Moreover, with the increase of the topological charge, more energy will be transferred from the x axis to the y axis, and the annular intensity is split into two parts along the y-axis direction. The results help us to investigate the dynamic propagation behaviors of the HCVB under the off-axis condition and also guide the calibration of the off-axis high-order cylindrical vector field in practice.
2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009
The paper presents a numerical reconstruction method of digital holography based on graphic proce... more The paper presents a numerical reconstruction method of digital holography based on graphic processing unit with MATLAB, which can obtain a calculation speed about 41 times faster than a CPU alone and make real-time system possible.
In this paper, a hiding method is proposed to store vast quantities of image information based on... more In this paper, a hiding method is proposed to store vast quantities of image information based on PCA. A sequence eigenimages of objects are obtained by using PCA method. Then, wavelet coefficients of eigenimages are embedded into the wavelet domain of the carrying image. When the hiding information is extracted, we can take advantage of the decomposition coefficients to reconstruct the objects. The proposed method does not store the object images directly, but store the eigenimages which contain information of the objects. The experimental results show that the features of object are effectively embedded into the carrying image, and the proposed algorithm has a high capacity.
Journal of the Optical Society of America. A, Optics, image science, and vision, 2014
The propagation characteristics of an off-axis high-order cylindrical vector beam (OHCVB) are stu... more The propagation characteristics of an off-axis high-order cylindrical vector beam (OHCVB) are studied in this paper. The analytic expressions for the electric field and intensity distribution of the OHCVB propagating in free space are presented, to our knowledge for the first time. The transverse intensity of the OHCVB, different from that of the input Gaussian beam, does not have an axially symmetric distribution, owing to a slight dislocation between the polarization singularity located in the vector field generator and the center point of the Gaussian beam. Numerical results show that the intensity distribution during propagation strongly depends on the propagation distance, dislocation displacement, and topological charge. Accompanied by beam expansion, the intensity distribution of the OHCVB tends to eventually become steady, and the dark core of the vector beam will disappear gradually during the process of propagation. Moreover, with the increase of the topological charge, more energy will be transferred from the x axis to the y axis, and the annular intensity is split into two parts along the y-axis direction. The results help us to investigate the dynamic propagation behaviors of the HCVB under the off-axis condition and also guide the calibration of the off-axis high-order cylindrical vector field in practice.
2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009
The paper presents a numerical reconstruction method of digital holography based on graphic proce... more The paper presents a numerical reconstruction method of digital holography based on graphic processing unit with MATLAB, which can obtain a calculation speed about 41 times faster than a CPU alone and make real-time system possible.
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Papers by Zhuqing Zhu