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We propose a general approach towards feature extraction for identifying sonar targets based on their composition and geometry. The key idea is to discover the geometric connections between braid-like features within acoustic color topography that includes magnitude and phase information. Specifically, we characterize each target as a graph of intersecting braided features, detected across the complex-valued...
Advances on underwater optical imaging has been rampant recently because of numerous applications it offers and the increasing use of underwater vehicles. Unfortunately, due to the inherent property of light in water, images tend to be hazy, have non-uniform illumination and colors get distorted. Retinex algorithms were formulated for dynamic range compression and tonal rendition to fix the illumination...
The authors have been working on support of coastal fishing utilizing ICT since 2004. We have realized two visualizations for the sustainable fishery until now. One is visualization of resources for capture fishing using digital diary and the other is visualization of environment for culture fishing using small buoys. In this paper, we propose the visualization of technology for octopus drift fishing...
Underwater obstacle detection is essential for safe deployment of autonomous underwater vehicles (AUVs). In this paper, we make an attempt to explore one kind of underwater obstacle detection strategy with the help of the Relative Total Variation(RTV) and Joint Guided Filtering(JGF). We first introduce one kind of virtual retinex model. Then we utilize the Relative Total Variation to extract the essential...
The Ocean Observatories Initiative (OOI) has a SubC 1Cam high-definition video camera (CAMHD) delivering real-time data since August 2015 from inside the caldera of Axial Seamount volcano, approximately 450 kilometers off the coast of Washington. These data are archived on the OOI's raw data repository at Rutgers University and are publicly available for download via the Apache HTTP Server endpoint...
ROV operations are expensive and there is an urge to improve on their efficiency and speed. The EU project “Effective Dexterous ROV Operations in Presence of Communications Latencies (DexROV)” proposes a solution to those needs by developing a set of hardware and software tools to support the teleoperation of ROVs over a satellite link, i.e., from remote locations including off-shore sites. A core...
Underwater images suffer from extremely unfavourable conditions. Light is heavily attenuated and scattered. Attenuation creates change in hue, scattering causes so called veiling light. General state of the art methods for enhancing image quality are either unreliable or cannot be easily used in underwater operations. On the other hand there is a well known method for haze removal in air, called Dark...
A set of Matlab tools were developed to create seafloor mosaics from AUV photosurveys. The resulting mosaic products are used to guide instrument placement, ground-truth acoustic backscatter targets, and inspect sensor packages or other targets. Because of the positional sensitivity of these tasks, effort has been made to preserve the geographic distribution of the image content. After initial image...
Enhancement of underwater images and videos is an important task required in several image-based applications like survey, seafloor mapping, telepresence, documentation etc. Color correction or white balance of underwater images is the most challenging issue because of the highly-variable illumination conditions, increasing bluish shift with the depth. Another problem is the low image contrast with...
This paper presents the design of an underwater staring spectral imaging system, which has 31 different color filters that covers the spectral range of 400 nm–700nm. The filters are settled on 2 filter wheels so that the size and weight of the system is deduced greatly, which is essential for underwater applications. Experiments are conducted to test the system, and the results show that the system...
This article develops a geometric framework for detecting targets, in the form of regions of interest, from certain sonar imagery. The main idea is to extract level sets from voxel images and compute local geometric features of the resulting surfaces. Examples include Gaussian and principal curvatures, radial distances, patch areas etc. These features are then compressed into histograms, or estimated...
In this paper, we propose readability enhancement of low light videos based on discrete wavelet transform (DWT). Captured videos under the low light condition have a narrow dynamic range (low contrast) with a dark tone as well as are highly corrupted by noise. We achieve both contrast enhancement and noise reduction in low light videos using wavelet coefficients. First, we perform normalization to...
Abrasive holograms allow people to experiment with impressive quasi-holography and create hologram artwork through simple means of creating reflective scratches on sheets of plastic. Most of the reported accounts of abrasive holography address the creation of three-dimensional illustrations. This work explores abrasive holograms for creating arbitrary holographic animations through scratch patterns...
In this paper, we propose boundary-preserving depth upsampling without texture copying artifacts and holes. Since high-resolution (HR) color images contain many edges and textures, they inevitably cause artifacts such as texture copying when they are used in depth upsampling. Thus, we perform rolling guidance filtering on HR color images before depth upsampling to preserve object boundaries in depth...
Films seek to elicit emotions in viewers by infusing the story they tell with an affective character or tone - in a word, a mood. In content-based multimedia analysis, considerable effort has been made to develop methods to estimate film affect computationally. However, results have been hampered by a tendency to classify film scenes either by genre or not at all, while other potentially helpful classification...
In this paper, a new method of hand gesture recognition is proposed. First, the hand region is separated based on the depth information. Then the wavelet feature is calculated by enforcing the wavelet invariant moments of the hand region, and the distance feature is extracted by calculating the distance from fingers to hand centroid. Next, a feature vector which is composed of wavelet invariant moments...
The method proposed in this paper focuses on problems of motion detection and counting of very small moving objects in videos. Existing video processing methods need a defined form or a sufficient size of moving objects and do not provide accurate results in the case of very small moving objects. Many false detections can occur or many moving objects can be missed. To deal with these problems, reliability...
Query suggestion plays a key role in improving the usability of image search. Textual Query Suggestion, widely used in existing search text-based image retrieval engines, is able to suggest a list of textual query terms based on users' query input. This paper presents a color prediction system dedicated to interactive drawing based image retrieval system on mobile devices. Usually, such systems retrieve...
Data retrieval serves a critical role in the development of multimedia applications. However, due to the exponential growth of multimedia data, high-speed and efficient indexing is becoming more and more difficult than ever. In this paper, we propose a novel approach to speed up the retrieval process by adopting a distributed computing paradigm through the Apache Spark framework. Utilizing search...
Computer-aided analyses of motion capture data require an effective and efficient concept of motion similarity. Traditional methods generally compare motion sequences by applying time-warping techniques to high-dimensional trajectories of joints. An increasing effectiveness of machine-learning techniques, such as deep convolutional neural networks, brings new possibilities for similarity comparison...
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