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Encyclopedia > Quantization
Look up quantization in
Wiktionary, the free dictionary.

Quantization is the procedure of constraining something from a continuous set of values (such as the real numbers) to a discrete set (such as the integers). Quantization in specific domains is discussed in: Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... In mathematics, the real numbers may be described informally as numbers that can be given by an infinite decimal representation, such as 2. ... The integers are commonly denoted by the above symbol. ...


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Quantization (404 words)
Quantization refers to the process of approximating the continuous set of values in the image data with a finite (preferably small) set of values.
The input to a quantizer is the original data, and the output is always one among a finite number of levels.
The quantization error (x - x') is used as a measure of the optimality of the quantizer and dequantizer.
ImpulseAdventure - JPEG Quality and Quantization Tables for Digital Cameras, Photoshop (0 words)
Note that the quantization tables generated from a save within Photoshop CS are concatenated together into a single quantization table of length 132 instead of the 2 x 67 that we see in other software programs and the digital camera itself.
The only case in which you can mathematically figure out the quantization tables from the quality setting is in programs such as Irfanview and other IJG-based JPEG encoders, where the quantization table is scaled by the quality setting (according to the function shown in the comment posted on 2006-03-07).
Given that the quantization table coefficients are up to the encoder to specify, one should be able to select a set based off of the JPEG Annex's suggested matrix.
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