|
Deriche Edge Detector
Deriche edge detector is an edge detection operator developed by Rachid Deriche in 1987. It is a multistep algorithm used to obtain an optimal result of edge detection in a discrete two-dimensional image. This algorithm is based on John F. Canny's work related to the edge detection ( Canny's edge detector) and his criteria for optimal edge detection: * ''Detection quality'' – all existing edges should be marked and no false detection should occur. * ''Accuracy'' - the marked edges should be as close to the edges in the real image as possible. * ''Unambiguity'' - a given edge in the image should only be marked once. No multiple responses to one edge in the real image should occur. For this reason, this algorithm is often referred to as Canny-Deriche detector. Differences between Canny and Deriche edge detector Deriche edge detector, like Canny edge detector, consists of the following 4 steps: # ''Smoothing'' # ''Calculation of magnitude and gradient direction'' # ''Non-maxi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edge Detection
Edge detection includes a variety of mathematical methods that aim at identifying edges, curves in a digital image at which the image brightness changes sharply or, more formally, has discontinuities. The same problem of finding discontinuities in one-dimensional signals is known as ''step detection'' and the problem of finding signal discontinuities over time is known as ''change detection''. Edge detection is a fundamental tool in image processing, machine vision and computer vision, particularly in the areas of feature detection and feature extraction. Motivations The purpose of detecting sharp changes in image brightness is to capture important events and changes in properties of the world. It can be shown that under rather general assumptions for an image formation model, discontinuities in image brightness are likely to correspond to: * discontinuities in depth, * discontinuities in surface orientation, * changes in material properties and * variations in scene illumi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunflowers In July
''Helianthus'' () is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. Except for three South American species, the species of ''Helianthus'' are native to North America and Central America. The best-known species is the common sunflower (''Helianthus annuus''), whose round flower heads in combination with the ligules look like the Sun. This and other species, notably Jerusalem artichoke (''H. tuberosus''), are cultivated in temperate regions and some tropical regions, as food crops for humans, cattle, and poultry, and as ornamental plants. The species ''H. annuus'' typically grows during the summer and into early fall, with the peak growth season being mid-summer. Several perennial ''Helianthus'' species are grown in gardens, but have a tendency to spread rapidly and can become aggressive. On the other hand, the whorled sunflower, ''Helianthus verticillatus'', was listed as an endangered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infinite Impulse Response
Infinite impulse response (IIR) is a property applying to many linear time-invariant systems that are distinguished by having an impulse response h(t) which does not become exactly zero past a certain point, but continues indefinitely. This is in contrast to a finite impulse response (FIR) system in which the impulse response ''does'' become exactly zero at times t>T for some finite T, thus being of finite duration. Common examples of linear time-invariant systems are most electronic and digital filters. Systems with this property are known as ''IIR systems'' or ''IIR filters''. In practice, the impulse response, even of IIR systems, usually approaches zero and can be neglected past a certain point. However the physical systems which give rise to IIR or FIR responses are dissimilar, and therein lies the importance of the distinction. For instance, analog electronic filters composed of resistors, capacitors, and/or inductors (and perhaps linear amplifiers) are generally IIR filter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grapevine Leaf Processed By Deriche Edge Detector
''Vitis'' (grapevine) is a genus of 79 accepted species of vining plants in the flowering plant family Vitaceae. The genus is made up of species predominantly from the Northern Hemisphere. It is economically important as the source of grapes, both for direct consumption of the fruit and for fermentation to produce wine. The study and cultivation of grapevines is called viticulture. Most cultivated ''Vitis'' varieties are wind-pollinated with hermaphroditic flowers containing both male and female reproductive structures, while wild species are dieceous. These flowers are grouped in bunches called inflorescences. In many species, such as ''Vitis vinifera'', each successfully pollinated flower becomes a grape berry with the inflorescence turning into a cluster of grapes. While the flowers of the grapevines are usually very small, the berries are often large and brightly colored with sweet flavors that attract birds and other animals to disperse the seeds contained within the berri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magician Processed By Deriche Edge Detector
Magician or The Magician may refer to: Performers * A practitioner of magic (supernatural) * A practitioner of magic (illusion) * Magician (fantasy), a character in a fictional fantasy context Entertainment Books * ''The Magician'', an 18th-century novel by Leitch Ritchie * ''The Magician'' (Maugham novel), a 1908 novel by Somerset Maugham * ''The Magicians'' (Priestley novel), a 1954 novel by J. B. Priestley * ''The Magician'' (Stein novel), a 1971 young adult novel by Sol Stein * ''The Magicians'', a 1976 novel by James E. Gunn * '' The Magician: The Secrets of the Immortal Nicholas Flamel'', a 2008 novel by Michael Scott * ''The Magicians'' (Grossman novel), by Lev Grossman, published 2009 * ''Magician'' (Feist novel), a 1982 novel in the ''Riftwar'' series by Raymond E. Feist * ''The Magician'', a 2021 novel by Colm Tóibín Films * ''The Magician'' (1898 film), a French short directed by Georges Méliès * ''The Magician'' (1900 film), a silent film by Thomas Edis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunflowers Image Processed By Deriche Edge Detector
''Helianthus'' () is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. Except for three South American species, the species of ''Helianthus'' are native to North America and Central America. The best-known species is the common sunflower (''Helianthus annuus''), whose round flower heads in combination with the ligules look like the Sun. This and other species, notably Jerusalem artichoke (''H. tuberosus''), are cultivated in temperate regions and some tropical regions, as food crops for humans, cattle, and poultry, and as ornamental plants. The species ''H. annuus'' typically grows during the summer and into early fall, with the peak growth season being mid-summer. Several perennial ''Helianthus'' species are grown in gardens, but have a tendency to spread rapidly and can become aggressive. On the other hand, the whorled sunflower, ''Helianthus verticillatus'', was listed as an endangered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grapevine Leaf
''Vitis'' (grapevine) is a genus of 79 accepted species of vining plants in the flowering plant family Vitaceae. The genus is made up of species predominantly from the Northern Hemisphere. It is economically important as the source of grapes, both for direct consumption of the fruit and for fermentation to produce wine. The study and cultivation of grapevines is called viticulture. Most cultivated ''Vitis'' varieties are wind-pollinated with hermaphroditic flowers containing both male and female reproductive structures, while wild species are dieceous. These flowers are grouped in bunches called inflorescences. In many species, such as ''Vitis vinifera'', each successfully pollinated flower becomes a grape berry with the inflorescence turning into a cluster of grapes. While the flowers of the grapevines are usually very small, the berries are often large and brightly colored with sweet flavors that attract birds and other animals to disperse the seeds contained within the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magician Artwork
Magician or The Magician may refer to: Performers * A practitioner of magic (supernatural) * A practitioner of magic (illusion) * Magician (fantasy), a character in a fictional fantasy context Entertainment Books * ''The Magician'', an 18th-century novel by Leitch Ritchie * ''The Magician'' (Maugham novel), a 1908 novel by Somerset Maugham * ''The Magicians'' (Priestley novel), a 1954 novel by J. B. Priestley * ''The Magician'' (Stein novel), a 1971 young adult novel by Sol Stein * ''The Magicians'', a 1976 novel by James E. Gunn * '' The Magician: The Secrets of the Immortal Nicholas Flamel'', a 2008 novel by Michael Scott * ''The Magicians'' (Grossman novel), by Lev Grossman, published 2009 * ''Magician'' (Feist novel), a 1982 novel in the ''Riftwar'' series by Raymond E. Feist * ''The Magician'', a 2021 novel by Colm Tóibín Films * ''The Magician'' (1898 film), a French short directed by Georges Méliès * ''The Magician'' (1900 film), a silent film by Thomas E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parallel Computing
Parallel computing is a type of computation in which many calculations or processes are carried out simultaneously. Large problems can often be divided into smaller ones, which can then be solved at the same time. There are several different forms of parallel computing: bit-level, instruction-level, data, and task parallelism. Parallelism has long been employed in high-performance computing, but has gained broader interest due to the physical constraints preventing frequency scaling.S.V. Adve ''et al.'' (November 2008)"Parallel Computing Research at Illinois: The UPCRC Agenda" (PDF). Parallel@Illinois, University of Illinois at Urbana-Champaign. "The main techniques for these performance benefits—increased clock frequency and smarter but increasingly complex architectures—are now hitting the so-called power wall. The computer industry has accepted that future performance increases must largely come from increasing the number of processors (or cores) on a die, rather than m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rachid Deriche
Rachid Deriche is a research director at Inria Sophia Antipolis, France, where he leads the research project Athena aiming to explore the Central Nervous System using computational imaging. He has published more than 60 journals and more than 180 conferences papers with a Google Scholar H-index of 67. He is known for the development of the edge detection algorithm, named after him. Background Deriche was born in 1954, in Thenia, Algeria. He studied electronics at Ecole Nationale Polytechnique of Algiers. In 1977, he moved to France to continue his studies at Ecole Nationale Superieure des Telecommunications of Paris, from which he graduated in 1979. Three years later, he received from University of Paris IX, Dauphine a Ph.D degree in mathematics. He obtained his HDR degree from University of Nice Sophia Antipolis in 1991. Contributions Deriche has made major contributions to the scientific community, mainly in image processing, computer vision and neuro-imaging. In 1987, De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
