3 results on '"Coelho, Gil"'
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2. Efficient CIEDE2000-Based Color Similarity Decision for Computer Vision.
- Author
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Pereira, Americo, Carvalho, Pedro, Coelho, Gil, and Corte-Real, Luis
- Subjects
COMPUTER vision ,VISUAL perception ,COLOR ,IMAGE processing ,COLORS ,APPLICATION software ,COMPUTER algorithms - Abstract
Color and color differences are critical aspects in many image processing and computer vision applications. A paradigmatic example is object segmentation, where color distances can greatly influence the performance of the algorithms. Metrics for color difference have been proposed in the literature, including the definition of standards such as CIEDE2000, which quantifies the change in visual perception of two given colors. This standard has been recommended for industrial computer vision applications, but the benefits of its application have been impaired by the complexity of the formula. This paper proposes a new strategy that improves the usability of the CIEDE2000 metric when a maximum acceptable distance can be imposed. We argue that, for applications where a maximum value, above which colors are considered to be different, can be established, then it is possible to reduce the amount of calculations of the metric, by preemptively analyzing the color features. This methodology encompasses the benefits of the metric while overcoming its computational limitations, thus broadening the range of applications of CIEDE2000 in both the computer vision algorithms and computational resource requirements. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
3. Space: The Final Frontier of War?
- Author
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Marsili, Marco, Fachada, Cristina Paula, Coelho Gil, João, and Ramalho Marreiros, João
- Subjects
Soviet Union ,united states ,russia ,US ,weapons ,international humanitarian law ,law of war ,Arms race ,space ,international law ,emerging disruptive technologies - Abstract
Iconic films such as Star Wars (1977) and Starship Troopers (1997) picture conflicts fought in outer space. UFO (1970) tells the story of a high-tech military organization established to defend Earth from space attack. Space: 1999 (1975) and Star Trek (1966) are about travelling in deep spacewhere no man has "bodly" gone before and imagine a technology that does not exist. Sometimes science fiction, inspired by science possibilities that one day can come true, simply imagines the future. Military applications of space technology, and considerations on space as a future theater of war when they would become technologically possible, were outlined in the Introduction to Outer Space, a pamphlet edited by the White House in 1958. To avoid the militarization of space and celestial bodies, and to guarantee their exploration and use for peaceful purposes to all countries, in 1967 the US, the U.K. and the Soviet Union opened for signature the Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies, which has become customary international law (White, 2000). The Outer Space Treatyforbids from placing in Earth orbit weapons of mass destruction, including nuclear weapons, or otherwise stationing them in outer space, but does not prohibit the placement of conventional weapons, and thus some highly destructive attack strategies such as kinetic bombardment are still potentially allowable (Bourbonniere & Lee, 2007). Since 1984, the Conference on Disarmament (CD), a body established by the UN General, has considered proposals, including draft treaties, aimed at preventing the placement of weapons in outer space. In 1998 Russia and China proposed a Treaty on Prevention of the Placement of Weapons in Outer Space and of the Threat or Use of Force Against Outer Space Objects (PPWT). An amended text drafted in 2014 was rejected by the US because it failed to address a series of relevant issues: it did not provide a definition of "outer space" neither of what constitutes a "weapon in outer space", and it did not ban terrestrially-based ASAT systems launched from the ground (CD, 2014; UNGA GA/DIS/3591; Plath, 2018). The US refused to negotiate a Proposed Prevention of an Arms Race in Space (PAROS) treaty as an international legally binding instrument in the CD, as Washington gathers that it simply mirrored the PPWT, including its failures. Therefore, the US voted against the Russian's No First Placement of Weapons in Outer Space (NFP) resolution (UNGA, A/C.1/72/L.53). So far, the international community failed to reach a solution to prevent an arms race in outer space. Space war is no more a science-fiction scenario; it’s an emerging reality., Presented orally at the ISMS 2022 Conference
- Published
- 2022
- Full Text
- View/download PDF
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