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.
We suggest a method to detect mine-like objects in side scan sonar images. First, we use the well known K-means algorithm recognizes which recognizes the presence of mine-like segments, followed by the Chan-Vese active contour algorithm to sharp and restore the edges of the suspected segments. Then, we convert the image into a shadows and highlights map based on geometrical features of the connectivity...
We compare two orthogonal modulation schemes for underwater acoustic sensor network using spread spectrum communication. The first which has been recently published, employs a frequency modulation signals spread by the same code. As an alternative, we propose to modulate the signals by using a different orthogonal code for each signal. Simulations and sea trial results demonstrate that the performance...
We introduce a low data rate video compression scheme for underwater acoustic communication. Recently, multi-carrier based underwater acoustic modems have been proposed and tested for data rates of up to tens of kilobits-per-second for about 1–4 kilometers transmission range. Online transmission of video data using these rates requires extreme compression. Herein, we propose pre-encoder and post-decoder...
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.