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Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Harbour Engineering is the property of Editorial Office of China Harbour Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Control Theory & Applications / Kongzhi Lilun Yu Yinyong is the property of Editorial Department of Control Theory & Applications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Control Theory & Applications / Kongzhi Lilun Yu Yinyong is the property of Editorial Department of Control Theory & Applications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Application Research of Computers / Jisuanji Yingyong Yanjiu is the property of Application Research of Computers Edition and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

According to the fact that the linear imaging model cannot explain the lens distortion, and to overcome the problem that the ordinary calibration methods are not. suit for the change of height and angle, based on the pin-hole model and the previous distortion correction, this paper builds up a mirror coordinates system to study the reflection relation of pixel and angle. By using trigonometric functions and distortion coefficient, the height parameter and angle parameter are introduced into the model, and then the non-linear model is obtained. Finally, under different kinds of situation, comparing with Tsai's method, the algorithm validity is verified. After changing the camera angle and height, the algorithm, which does not require re-calibration, is still with good accuracy and robustness. Thus, the algorithm can be applied to the engineering field. [ABSTRACT FROM AUTHOR]

In mobile internet era, three-dimensional color code has becoming the new trend of the code for its technological superiority, however, its copyright protection has arised. In this paper, combined with singular value decomposition (SVD) , a robust algorithm based on Contourlet transform is proposed. After performing the Contourlet transform on the green channel, approximation sub-band of host image is performed SVD to emb the watermark. The experimental results show that the proposed algorithm is robust and invisible and the watermarking can be extracted with small watermark embedding strength which can protect the copyright effectively. The algorithm is robust against common processing such as JPEG compression, noise, filtering, rotating and cropping. [ABSTRACT FROM AUTHOR]

During the process of modeling and simulation for hydromechanical systems, the model precision can be affected directly by the choice of liquid density and fluid bulk modulus. The traditional method, in which these two parameters are taken as constants based on engineering experience, often lowers the modeling precision. A new method to calculate the liquid density and the fluid bulk modulus has been proposed in this paper, and the formula and algorithm for simplifying these parameters are summarized. A case widely used in the aerospace systems is thoroughly explained with this method. Results indicate that the pressure in positive stage has a little effect on the liquid density and fluid bulk modulus, whereas it must be taken the influence of gas content and pressure on these parameters into account during the stage of negative pressure. [ABSTRACT FROM AUTHOR]