Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province

Jinhua, China

Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province

Jinhua, China
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Ying-Hong L.,Zhejiang Normal University | Ying-Hong L.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | Wei-Min J.,Zhejiang Normal University | Wei-Min J.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | Xin Y.,Soochow University of China
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

An encryption method combining optical digital holography with digital decryption on computer is proposed, which avoid the precise setup of optical devices. A digital hologram of three-dimensional (3D) object and a hologram of key information are recorded by optical method in the encryption process. The 3D object is reconstructed by filtering in spectrum domain and simple numerical calculation. The quality of reconstructed object is improved by reducing speckle noise. The robustness against occlusion and noise attacks of the system has also been analyzed. Optical experiments results are presented. © 2014 SPIE.


Shi X.-W.,Zhejiang Normal University | Shi X.-W.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | Qian Y.-X.,Zhejiang Normal University | Qian Y.-X.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

It is difficult to dectect and recognize moving target for optical correlator owing to the image information containing various rotation and scale variation, though optical processing owns the advantage of high-speed, large capacity and real-time. An efficient approach was proposed to impove correlation peak and enhance recognition performance of target based on Fourier-Mellin transform, by which optical correlator is not sensitive to the distortion of image information, and it will alleviate greatly the complexity of image recognition. We have also constructed an detection and recognition system based on optical joint correlator, the computer simulations and experimental results show that the proposed method has got sharp corrlation peak and improved the detection performance. © 2014 SPIE.


Hong X.-T.,Zhejiang Normal University | Hong X.-T.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | Qian Y.-X.,Zhejiang Normal University | Qian Y.-X.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

To restore the motion blurred image caused by various vibration and attitude variation in remote imaging, an approach is presented which is based on joint transform correlator (JTC). An auxiliary high-speed CCD is used to capture image sequences When the prime CCD is imaging in exposure period, these image sequences are optically calculated by JTC system, and image motion vector can be effectively detected and point spread function is accurately modeled instantaneously, it will alleviate greatly the complexity of image restoration algorithm. Finally, a simple restoration algorithm is proposed to restore the blurred image. We have also constructed an image restoration system based on joint transform correlator. The experimental results show that the proposed method has improved image quality greatly. © 2014 SPIE.


Qian Y.,Zhejiang Normal University | Qian Y.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | Li D.,Zhejiang Normal University | Li D.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2015

We theoretically demonstrate a novel optical bottle beam that is produced by exploiting the self-bending characteristic of circularly arranged Airy beam (AB) arrays. The AB arrays propagate with an inward acceleration to generate such an optical bottle beam, whose size can be flexibly controlled by changing the spacing distance between ABs in the input plane. Moreover, the intensity of our proposed optical bottle beam is significantly increased in the output plane by superposing multiple coherent ABs, as compared to the case of the conventional Gaussian beam (GB). Numerical simulations are performed, the results of which show that the tunable optical bottle can be formed by exploiting the self-bending property of ABs. Some possible applications are also discussed. We believe that the intriguing characteristics of the tunable optical bottle can lead to novel techniques in medical treatment and atom manipulation. ©, 2015, Science Press. All right reserved.


Hong X.,Zhejiang Normal University | Hong X.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province | Qian Y.,Zhejiang Normal University | Qian Y.,Key Laboratory of Optical Information Detecting and Display Technology in Zhejiang Province
Guangxue Xuebao/Acta Optica Sinica | Year: 2015

To measure the sub-pixel image motion which is caused by satellite attitude instability and vibration, an effective approach to measure image motion is presented based on Hybrid Photoelectirc joint transform correlator. Firstly, captured image sequences are optically calculated by joint transform correlator, then the acquired joint power spectrum is processed by Laplace transform, an improved correlation peak is obtained. Lastly, a modified centroid algorithm is proposed to get more accurate motion measurement. Motion measurement based on optical correlation is discussed, and the optical experimental system is also set up. The experimental results show that the measurement error is as low as 0.03 pixel, the accuracy is improved greatly. ©, 2015, Chinese Optical Society. All right reserved.

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