quantization


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quantization

[‚kwän·tə′zā·shən]
(communications)
Division of the range of values of a wave into a finite number of subranges, each of which is represented by an assigned or quantized value within the subrange.
(quantum mechanics)
The restriction of an observable quantity, such as energy or angular momentum, associated with a physical system, such as an atom, molecule, or elementary particle, to a discrete set of values.
The transition from a description of a system of particles or fields in the classical approximation where canonically conjugate variables commute, to a description where these variables are treated as noncommuting operators; quantization (first definition) is a result of this procedure.
(science and technology)
The restriction of a variable to a discrete number of possible values; thus the age of a person is usually quantized as a whole number of years.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

quantization

(1) The division of a range of values into a single number, code or classification. For example, class A is 0 to 999, class B is 1000 to 9999 and class C is 10000 and above.

(2) In analog to digital conversion, the assignment of a number to the amplitude of a wave. The larger the range of numbers, the finer the increments can be measured, and the more the digital sample represents the analog signal. See sampling and quantization error.
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References in periodicals archive ?
Caption: Figure 1: The watermarking embedding process that integrates (1) the fast DCT algorithm, (2) selection of the four middle frequency coefficients, (3) random permutation of the watermark, and (4) normalization by quantization.
We show, that the histogram equalization works significantly faster than the successive mean quantization transform.
Sarkar solved the problem based on Angle Quantization Index Modulation (AQIM) within STDM framework [11].
By smoothing the transformed values over time, a better overall consistency could be achieved, although the initial selection of reference points might prove problematic, particularly since skipping the quantization step would be very costly in terms of computational effort, especially considering that video formats are often high-resolution.
Although QL quantizer provides almost constant SQNR in the wide dynamic range of variances, even better results can be achieved with switched quantization technique.
Since non-uniform block sizes are used, we need quantization matrices of sizes suitable for the 16 different block sizes.
while Signal to Quantization Noise Ratio (SQNR), representing the more indicative parameter for the quantizer performance assessment, is defined as [1-3]:
After applying the quantization, the compression ratio must be calculated to see the efficiency of the algorithm.
In order to meet the requirements of the discrete time MDP approach, a quantization method is applied to approximate the continuous process of BOT.
As it is typically the case regarding the quantization of systems with an infinite number of degrees of freedom, also in the quantization of the Dirac field in curved space-time, one must face the issue of ambiguity, or lack of uniqueness in the quantization procedure.