1,491 research outputs found
A Fusion Framework for Camouflaged Moving Foreground Detection in the Wavelet Domain
Detecting camouflaged moving foreground objects has been known to be
difficult due to the similarity between the foreground objects and the
background. Conventional methods cannot distinguish the foreground from
background due to the small differences between them and thus suffer from
under-detection of the camouflaged foreground objects. In this paper, we
present a fusion framework to address this problem in the wavelet domain. We
first show that the small differences in the image domain can be highlighted in
certain wavelet bands. Then the likelihood of each wavelet coefficient being
foreground is estimated by formulating foreground and background models for
each wavelet band. The proposed framework effectively aggregates the
likelihoods from different wavelet bands based on the characteristics of the
wavelet transform. Experimental results demonstrated that the proposed method
significantly outperformed existing methods in detecting camouflaged foreground
objects. Specifically, the average F-measure for the proposed algorithm was
0.87, compared to 0.71 to 0.8 for the other state-of-the-art methods.Comment: 13 pages, accepted by IEEE TI
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Recognition by directed attention to recursively partitioned images
A learning/recognition model (and instantiating program) is described which recursively combines the learning paradigms of conceptual clustering (Michalski, 1980) and learning-from-examples to resolve the ambiguities of real-world recognition. The model is based on neuropsychological and psychological evidence that the visual system is analytic, hierarchical, and composed of a parallel/serial dichotomy (many, see conclusions by Crick, 1984). Emulating the experimental evidence, parallel processes in the model decompose the image into components and cluster the constituents in much the same way as the image processing technique known as moment analysis (Alt, 1962). Serial, attentive mechanisms then reassemble the decompositions by investigating spatial relationships between components. The use of attentive mechanisms extends the moment analysis technique to handle alterations in structure and solves the contention problem created by combining the two learning paradigms. The contention results from a disagreement between the teacher and the model on what constitutes the salient features at the highest level of the symbol. There are four cases ZBT must handle, two of which result from the disagreement with the teacher. The parallel/serial dichotomy represents a vertical/horizontal tradeoff between the invariant and variant features of a domain. The resultant learned hierarchy allows ZBT to recognize structural differences while avoiding problems of exponential growth
No compromise between metabolism and behavior of decorator crabs in reduced pH conditions.
Many marine calcifiers experience metabolic costs when exposed to experimental ocean acidification conditions, potentially limiting the energy available to support regulatory processes and behaviors. Decorator crabs expend energy on decoration camouflage and may face acute trade-offs under environmental stress. We hypothesized that under reduced pH conditions, decorator crabs will be energy limited and allocate energy towards growth and calcification at the expense of decoration behavior. Decorator crabs, Pelia tumida, were exposed to ambient (8.01) and reduced (7.74) pH conditions for five weeks. Half of the animals in each treatment were given sponge to decorate with. Animals were analyzed for changes in body mass, exoskeleton mineral content (Ca and Mg), organic content (a proxy for metabolism), and decoration behavior (sponge mass and percent cover). Overall, decorator crabs showed no signs of energy limitation under reduced pH conditions. Exoskeleton mineral content, body mass, and organic content of crabs remained the same across pH and decoration treatments, with no effect of reduced pH on decoration behavior. Despite being a relatively inactive, osmoconforming species, Pelia tumida is able to maintain multiple regulatory processes and behavior when exposed to environmental pH stress, which underscores the complexity of responses within Crustacea to ocean acidification conditions
Disrupted Dwelling: Forensic Aesthetics and the Visibility of Violence
The aim of the present text is to offer an interpretation of Eyal Weizman’s_concept of forensic aesthetics, demonstrating how this approach reveals the ways in which the aesthetic perception of violence, trauma, and decomposition of human dwelling can be transformed in the current digital optical war regime. Forensic aesthetics tries to grasp a_forensic sensibility as both an aesthetic and political practice, requiring individuals to become sensitive to violence and be able to comprehend and experience the affects of disintegration, trauma, and despair that are characteristic of the experience of the survivor. The environment, dwelling, and architecture are not only inert observers, but rather have become material witnesses of crimes, violence, and destruction of various dwellings inhabited by various species. The application of digital technologies in forensic aesthetics carries a strong ethical appeal to avoid injustice. Traces and fragments of evidence, as well as multiple videos and images, are synchronized and recomposed within digital architectural environments and dwellings, as an optical and interpretative tool that shapes a new type of aesthetics
Infrared thermochromic antenna composite for self-adaptive thermoregulation
Self-adaptive thermoregulation, the mechanism living organisms use to balance
their temperature, holds great promise for decarbonizing cooling and heating
processes. The functionality can be effectively emulated by engineering the
thermal emissivity of materials to adapt to background temperature variations.
Yet, solutions that marry large emissivity switching () with
scalability, cost-effectiveness and design freedom are still lacking. Here, we
fill this gap by introducing infrared dipole antennas made of tunable
thermochromic materials. We demonstrate that non-spherical antennas (rods,
stars and flakes) made of vanadium-dioxide can exhibit a massive (~200-fold)
increase in their absorption cross-section as temperature rises. Embedding
these antennas in polymer films, or simply spraying them directly, creates
free-form thermoregulation composites, featuring an outstanding
in spectral ranges that can be tuned at will. Our
research paves the way for versatile self-adaptive heat management solutions
(coatings, fibers, membranes and films) that could find application in
radiative-cooling, heat-sensing, thermal-camouflage, and other
Physical Adversarial Attack meets Computer Vision: A Decade Survey
Although Deep Neural Networks (DNNs) have achieved impressive results in
computer vision, their exposed vulnerability to adversarial attacks remains a
serious concern. A series of works has shown that by adding elaborate
perturbations to images, DNNs could have catastrophic degradation in
performance metrics. And this phenomenon does not only exist in the digital
space but also in the physical space. Therefore, estimating the security of
these DNNs-based systems is critical for safely deploying them in the real
world, especially for security-critical applications, e.g., autonomous cars,
video surveillance, and medical diagnosis. In this paper, we focus on physical
adversarial attacks and provide a comprehensive survey of over 150 existing
papers. We first clarify the concept of the physical adversarial attack and
analyze its characteristics. Then, we define the adversarial medium, essential
to perform attacks in the physical world. Next, we present the physical
adversarial attack methods in task order: classification, detection, and
re-identification, and introduce their performance in solving the trilemma:
effectiveness, stealthiness, and robustness. In the end, we discuss the current
challenges and potential future directions.Comment: 32 pages. Under Revie
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