The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Approaches to abnormality detection in crowded scene largely rely on supervised methods using discriminative models. In this paper, we presents a novel and efficient unsupervised learning method for video analysis. We start from visual saliency, which has been used in several vision tasks, e.g., image classification, object detection, and foreground segmentation. To detect saliency regions in video...
To resolve the low communication rate and susceptible to multipath interference and other issues of pulse modulation communication method, a new scheme of underwater acoustic (UWA) communication was proposed based on fractional Fourier transform (FRFT). Fractional Fourier transform is only applicable to linear frequency modulation (LFM) signal, which has the advantages of high processing gain, long...
As an important kind of non-stationary signals, the linear frequency modulation signals have been widely used in underwater acoustic communication systems and signal detection systems. The fractional Fourier transform is an effective transform manner to analyse non-stationary signals especially to detect linear frequency modulation signals. The time measurement manner can be changed into frequency...
A new underwater acoustic (UWA) communication system is proposed based on fractional Fourier transform (FRFT) for complex condition of underwater environment. Because of using chirp-basis function in FRFT, this communication mode uses linear frequency modulation (LFM) as carrier signal of transmitted information, which has good anti-jamming capability. The code elements were divided into groups in...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.