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A synthetic aperture sonar (SAS) system borne by an autonomous underwater vehicle is state-of-the-art for highresolution sea floor mapping. In the application of automatic target recognition, e.g., for naval mine hunting, the high-resolution SAS images serve as input to a detection and classification post-processing stage, which highly relies on excellent image quality. Future autonomous mine hunting...
An algorithm for the in situ adaptation of the survey route of an autonomous underwater vehicle (AUV) equipped with side-looking sonars is proposed. The algorithm immediately exploits the through-the-sensor data that is collected during the mission in order to ensure that quality data is collected everywhere in the area of interest. By introducing flexibility into the survey of the AUV, various limitations...
A new algorithm for the detection of underwater man-made objects in sonar imagery is proposed. The algorithm is made extremely fast by employing a cascaded architecture and by exploiting integral-image representations. As a result, the method makes real-time detection of objects of interest in streaming sonar data collected by an autonomous underwater vehicle feasible. No training data is required...
In an EPI or GRASE magnetic resonance method, phase errors caused by the alternation of the read gradient polarity (Gx) are corrected by obtaining a set of reference measurements with both polarities at low values in the phase encoding (ky) direction. From these reference measurements the phase errors are estimated. Subsequently, the measurements covering the whole of k-space are corrected and a...
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