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Texels
In Computer graphics, computer graphics, a texel, texture element, or texture pixel is the fundamental unit of a texture maps, texture map. Textures are represented by Array (data structure), arrays of texels representing the texture space, just as other Digital image, images are represented by arrays of pixels. Texels can also be described by Image segmentation, image regions that are obtained through simple procedures such as Thresholding (image processing), thresholding. Voronoi diagram, Voronoi tesselation can be used to define their spatial relationships—divisions are made at the midpoints between the centroids of each texel and the centroids of every surrounding texel for the entire texture. This results in each texel centroid having a Voronoi polygon surrounding it, which consists of all points that are closer to its own texel centroid than any other centroid. Rendering When texturing a 3D surface or surfaces (a process known as texture mapping), the rendering (comput ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Texture Filtering
In computer graphics, texture filtering or texture smoothing is the method used to determine the texture color for a Texture mapping, texture mapped pixel, using the colors of nearby Texel (graphics), texels (ie. pixels of the texture). Filtering describes how a texture is applied at many different shapes, size, angles and scales. Depending on the chosen filter algorithm, the result will show varying degrees of blurriness, detail, Spatial anti-aliasing, spatial aliasing, Temporal anti-aliasing, temporal aliasing and blocking. Depending on the circumstances, filtering can be performed in software (such as a software rendering package) or in hardware, eg. with either real time or graphics processing unit, GPU accelerated rendering circuits, or in a mixture of both. For most common interactive graphical applications, modern texture filtering is performed by Texture mapping unit, dedicated hardware which optimizes memory access through memory cacheing and Cache prefetching, pre-fetch, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Texture Mapping
Texture mapping is a term used in computer graphics to describe how 2D images are projected onto 3D models. The most common variant is the UV unwrap, which can be described as an inverse paper cutout, where the surfaces of a 3D model are cut apart so that it can be unfolded into a 2D coordinate space (UV Space). Semantic Texture mapping can both refer to the task of unwrapping a 3D model, the abstract that a 3D model has textures applied to it and the related algorithm of the 3D software. Texture map refers to a Raster graphics also called image, texture. If the texture stores a specific property it's also referred to as color map, roughness map, etc. The coordinate space which converts from the 3D space of a 3D model into a 2D space so that it can sample from the Texture map is called: UV Space, UV Coordinates, Texture Space. Algorithm A simplified explanation of how an algorithm could work to render an image: # For each pixel we trace the coordinates of the screen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voxel
In computing, a voxel is a representation of a value on a three-dimensional regular grid, akin to the two-dimensional pixel. Voxels are frequently used in the Data visualization, visualization and analysis of medical imaging, medical and scientific data (e.g. geographic information systems (GIS)). Voxels also have technical and artistic applications in video games, largely originating with surface rendering in ''Outcast (video game), Outcast'' (1999). ''Minecraft'' (2011) makes use of an entirely voxelated world to allow for a fully destructable and constructable environment. Voxel art, of the sort used in ''Minecraft'' and elsewhere, is a style and format of 3D art analogous to pixel art. As with pixels in a 2D bitmap, voxels themselves do not typically have their position (i.e. coordinates) explicitly encoded with their values. Instead, Rendering (computer graphics), rendering systems infer the position of a voxel based upon its position relative to other voxels (i.e., its pos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Resel
In image analysis, a resel (from ''res''olution ''el''ement) represents the actual spatial resolution in an image or a volumetric dataset. The number of resels in the image may be lower or equal to the number of pixel/voxels in the image. In an actual image the resels can vary across the image and indeed the local resolution can be expressed as "resels per pixel" (or "resels per voxel"). In functional neuroimaging analysis, an estimate of the number of resels together with random field theory is used in statistical inference. Keith Worsley has proposed an estimate for the number of resels/roughness. The word "resel" is related to the words "pixel", "texel", and "voxel". Waldo R. Tobler is probably among the first to use the word. See also * Kell factor * Full width at half maximum References Bibliography * Keith J. Worsley, An unbiased estimator for the roughness of a multivariate Gaussian random field', Technical report A technical report (also scientific report) is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pixel
In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a Raster graphics, raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, pixels are the smallest element that can be manipulated through software. Each pixel is a Sampling (signal processing), sample of an original image; more samples typically provide more accurate representations of the original. The Intensity (physics), intensity of each pixel is variable. In color imaging systems, a color is typically represented by three or four component intensities such as RGB color model, red, green, and blue, or CMYK color model, cyan, magenta, yellow, and black. In some contexts (such as descriptions of camera sensors), ''pixel'' refers to a single scalar element of a multi-component representation (called a ''photosite'' in the camera sensor context, although ''wikt:sensel, sensel'' is sometimes used), while in yet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrapping (graphics)
In computer graphics, wrapping is the process of limiting a position to an area. A good example of wrapping is wallpaper, a single pattern repeated indefinitely over a wall. Wrapping is used in 3D computer graphics to repeat a texture over a polygon, eliminating the need for large textures or multiple polygons. To wrap a position ''x'' to an area of width ''w'', calculate the value x' = x \text w. Implementation For computational purposes the wrapped value ''x of ''x'' can be expressed as :x' = x - \lfloor (x - x_) / (x_ - x_) \rfloor \cdot (x_ - x_) where x_ is the highest value in the range, and x_ is the lowest value in the range. Pseudocode for wrapping of a value to a range other than 0–1 is function wrap(X, Min, Max: Real): Real; X := X - Int((X - Min) / (Max - Min)) * (Max - Min); if X < 0 then // This corrects the problem caused by using Int instead of Floor X := X + Max - Min; return X; |
Clamping (graphics)
In computer science, clamping, or clipping is the process of limiting a value to a range between a minimum and a maximum value. Unlike wrapping, clamping merely moves the point to the nearest available value. In Python, clamping can be defined as follows: def clamp(x, minimum, maximum): if x maximum: return maximum return x This is equivalent to for languages that support the functions min and max. Uses Several programming languages and libraries provide functions for fast and vectorized clamping. In Python, the pandas library offers the Series.clip and DataFrame.clip methods. The NumPy library offers the clip function. In the Wolfram Language, it is implemented as . In OpenGL, the glClearColor function takes four GLfloat values which are then 'clamped' to the range ,1/math>. One of the many uses of clamping in computer graphics Computer graphics deals with generating images and art with the aid of computers. Computer graphics is a core technology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Integer
An integer is the number zero (0), a positive natural number (1, 2, 3, ...), or the negation of a positive natural number (−1, −2, −3, ...). The negations or additive inverses of the positive natural numbers are referred to as negative integers. The set (mathematics), set of all integers is often denoted by the boldface or blackboard bold The set of natural numbers \mathbb is a subset of \mathbb, which in turn is a subset of the set of all rational numbers \mathbb, itself a subset of the real numbers \mathbb. Like the set of natural numbers, the set of integers \mathbb is Countable set, countably infinite. An integer may be regarded as a real number that can be written without a fraction, fractional component. For example, 21, 4, 0, and −2048 are integers, while 9.75, , 5/4, and Square root of 2, are not. The integers form the smallest Group (mathematics), group and the smallest ring (mathematics), ring containing the natural numbers. In algebraic number theory, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eric Haines
Eric Haines is an American software engineer and expert in computer graphics, specifically image rendering. he is with NVIDIA Corporation as Distinguished Engineer. He is a co-author of the book ''Real-Time Rendering'', currently in its fourth edition.Tomas Akenine-Möller, Eric Haines, Naty Hoffman, Angelo Pesce, Michał Iwanicki, and Sébastien Hillaire''Real-Time Rendering'' A K Peters/CRC Press, 4th edition: 2018, 1198pp. * 3rd edition: Tomas Akenine-Möller, Eric Haines, and Naty Hoffman, ''Real-Time Rendering'', Natick: A.K. Peters Ltd., 3rd edition: 2008, 1045pp. * 2nd edition: Tomas Akenine-Möller, Eric Haines, ''Real-Time Rendering'', Natick: A.K. Peters Ltd., 2002, 900pp. * 1st edition: Tomas Möller, Eric Haines, ''Real-Time Rendering'', 1999, 512pp. Eric Haines earned an M.S. in 1986 from Cornell University. His thesis was ''The Light Buffer: A Ray Tracer Shadow Testing Accelerator''. An image created by software based on the thesis was used on the September ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
UV Mapping
UV mapping is the 3D modeling process of projecting a 3D model's surface to a 2D image for texture mapping. The letters "U" and "V" denote the axes of the 2D texture because "X", "Y", and "Z" are already used to denote the axes of the 3D object in model space, while "W" (in addition to XYZ) is used in calculating quaternion rotations, a common operation in computer graphics. Process UV texturing permits polygons that make up a 3D object to be painted with color (and other surface attributes) from an ordinary image. The image is called a UV texture map.Mullen, T (2009). Mastering Blender. 1st ed. Indianapolis, Indiana: Wiley Publishing, Inc. The UV mapping process involves assigning pixels in the image to surface mappings on the polygon, usually done by "programmatically" copying a triangular piece of the image map and pasting it onto a triangle on the object.Murdock, K.L. (2008). 3ds Max 2009 Bible. 1st ed. Indianapolis, Indiana: Wiley Publishing, Inc. UV texturing is an alter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
