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The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it can be measured in two different ways. The simpler way is the static compression ratio: the ratio of the volume of the cylinder when ...
Gabor filter. In image processing, a Gabor filter, named after Dennis Gabor, who first proposed it as a 1D filter. [1] The Gabor filter was first generalized to 2D by Gösta Granlund, [2] by adding a reference direction. The Gabor filter is a linear filter used for texture analysis, which essentially means that it analyzes whether there is any ...
In aeronautical engineering, overall pressure ratio, or overall compression ratio, is the ratio of the stagnation pressure as measured at the front and rear of the compressor of a gas turbine engine. The terms compression ratio and pressure ratio are used interchangeably. [1] Overall compression ratio also means the overall cycle pressure ratio ...
Expansion of working fluid takes place isentropically and work is done by the system on the piston. The volume ratio / is called the "isentropic expansion ratio". (For the Otto cycle is the same as the compression ratio /). Mechanically this is the expansion of the hot gaseous mixture in the cylinder known as expansion (power) stroke.
Image compression. Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other ...
Engine efficiency of thermal engines is the relationship between the total energy contained in the fuel, and the amount of energy used to perform useful work. There are two classifications of thermal engines-. External combustion engines (steam piston, steam turbine, and the Stirling cycle engine). Each of these engines has thermal efficiency ...
Human visual system model. A human visual system model (HVS model) is used by image processing, video processing and computer vision experts to deal with biological and psychological processes that are not yet fully understood. Such a model is used to simplify the behaviors of what is a very complex system. As our knowledge of the true visual ...
Pyramid, or pyramid representation, is a type of multi-scale signal representation developed by the computer vision, image processing and signal processing communities, in which a signal or an image is subject to repeated smoothing and subsampling. Pyramid representation is a predecessor to scale-space representation and multiresolution analysis.