When the aerial camera photograph,a variety of image motion is caused by prior to the flight, pitching, rolling and vibration and other reasons,thus leading to the existence of relative motion of the illuminated objects in the focal plane of a photosensitive medium, the image is blured,and the imaging quality of the camera is seriously affected. Various causes of image motion and effects on image is analyzed by this paper,the necessity of image motion compensation is expounded. By analyzing existed methods of image motion compensation ,and on this basis, a new multi degree of freedom motion compensation method is designed,through the parallel mechanism motion,for image motion compensation by optical image motion compensation principle,a variety of airborne camera to take pictures of the image motion also can be eliminated.
Different higher education backgrounds in China and Germany led to challenges in the curriculum design at the beginning of our cooperative bachelor program in Optoelectronics Engineering. We see challenges in different subject requirements from both sides and in the German language requirements for Chinese students. The curriculum was optimized according to the ASIIN criteria, which makes it acceptable and understandable by both countries. German students are integrated into the Chinese class and get the same lectures like their Chinese colleagues. Intercultural and curriculum challenges are successfully solved. The results are summarized to provide an example for other similar international programs.
Liquid lens is a novel optical device which can implement active zooming. With liquid lens, zoom camera can be
designed with more miniature size and simpler structure than before. It is thought that the micro zoom system with liquid
lens has a very wide potential applications in many fields, in which the volume and weight of the system are critically
limited, such as endoscope, mobile, PDA and so on. There are mainly three types of tunable-focus liquid lens: liquid
crystal lens, electrowetting effect based liquid lens and liquid-filled membrane lens. Comparing with the other two kinds
of liquid lens, the liquid-filled membrane lens has the advantages of simple structure, flexible aperture and high zooming
efficiency. But its membrane surface will have an initial shape deformation caused by the gravity when the aperture of
the lens is at large size, which will lead to the wave front aberration and the imaging quality impairing. In this paper, the
initial deformation of the lens caused by the gravity was simulated based on the theory of Elastic Mechanics, which was
calculated by the Finite Element Analysis method. The relationship between the diameter of the lens and the wave front
aberration caused by the gravity was studied. And the Optical path difference produced by different liquid density was
also analyzed.
As a relay optical component, fiber optic taper has become more important and more widely used in the integrated taper assembly image intensified sensors for military and medical imaging application. However, the method for evaluating the quality of output images from the fiber optic taper is few. In this article, the Modulation Transfer Function (MTF) is introduced and measured to evaluate the image quality of fiber optic taper. Because fiber optic taper is of a mosaic array architecture, there are some new problems need to be resolved in defining MTF of it. And there also should be some special requirements in MTF measurement. Two methods including edge scanning and point imaging analyzing are introduced in measuring MTF of fiber optic taper, in which the incident light, scanning step and scanning range are specially limited. Experiments show that the results of the measurements consist with the theoretical analysis simulated by computer. And the spatial averaged MTF of fiber optic taper has been gotten by two means. It is concluded that the MTF value measured by point imaging is always some higher than measured by edge scanning, because the point imaging is more weakly effected by the fiber arrangement in taper.
It is very difficult to measure the distance of a moving point target which is not cooperative for detecting in the remote sensing field, because that the point target has no geometrical dimensions and textures can be used and is easy to be missed. In this paper, a new algorithm based on the image sequence and the nonlinear regressive filtering algorithm is proposed, in order to determine the 3-D parameters of the moving point target in an efficient passive way. And a new multi-channel optical imaging system is designed, which is composed of a high- resolution center imaging system and four low-resolution sub-imaging systems. By the geometrical relationship of the four sub-imaging system, the initial values of the nonlinear regressive filtering algorithm for estimating can be obtained easily. Finally, the experiments of the proposed algorithm have been done on a real system, and the results proved that the algorithm could passively obtain the 3-D parameters of the moving point target efficiently. Furthermore, in the estimating procedure, the character of the nonlinear regressive filtering algorithm saves lots of memory units and reduces the computing quantity.
In this paper, a measuring method utilizing Modulation Transfer Function (MTF) to evaluate the imaging performance of fiber optical plates, is proposed. As a kind of relay optical component in optical imaging systems, optical fiber transfer image plates have become more important and more available. By digital simulating the discrete MTF values, algorithm for MTF measure of fiber plates is studied. And MTF experimental results for the performance evaluation of fiber plates with knife-edge effect compared CCD test, are also discussed.
A micro-array imaging system with multi-channel, parallel processing is proposed in this paper. Compared with the single- aperture imaging system, the array imaging system has some advantages- wider view field to prevent losing target, and higher sensitivity for moving as the compound eyes of insects. Utilizing the moving sensitivity, one is able to measure the properties of moving object, like speed, acceleration, direction and so on. A microlens array plays an important role in the micro-array imaging system. Based on the system construction and the visual principle, several experimental and evaluating results are introduced. Meanwhile, new approaches of image capturing and data processing to solve the contradiction between view field and resolution are discussed initially.
This paper presents our continuing work in the area of nonlinear system analysis and simulation applying ANN methods. The system simulation for the payload of communications satellite is the process of predicting the overall system performance from the performance of each component in the system. The important part of this system simulation is the analysis and simulation of nonlinearity in the system, such as power transfer characteristics, and intermodulation. The model and simulation of nonlinearity for a communications satellite channel contained nonlinear components is described in this paper. Polynomial approximation by least squares and artificial neural networks simulation have been used to approximate the tested data curve of a single tone power transfer characteristics for each nonlinear element in the system. These methods have been applied to the Communications Satellite System Simulation Software Package that is developed by us in the Xi'an Institute of Space Radio Technology. Both of these methods have also been compared with the test data of real system of DFH-3 communications satellite. The results show that the approximation method using ANN concept presented in this article is more accurate and of theoretical importance and practical value in the analysis of nonlinear system problem.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.