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There are eight standard DCT variants, of which four are common. The most common variant of discrete cosine transform is the type-II DCT, which is often called simply the DCT. This was the original DCT as first proposed by Ahmed. Its inverse, the type-III DCT, is correspondingly often called simply the inverse DCT or the IDCT.
Trellis quantization is an algorithm that can improve data compression in DCT-based encoding methods. It is used to optimize residual DCT coefficients after motion estimation in lossy video compression encoders such as Xvid and x264. Trellis quantization reduces the size of some DCT coefficients while recovering others to take their place.
The growing interest in the interfaces of prosody with other areas, notably pragmatics, has led to an interesting cross-fertilization of methods such as the Discourse Completion Task (DCT). In Vanrell, Feldhausen & Astruc (2018), [ 5 ] the authors review previous and ongoing work in which the DCT method has been used to research (Romamce) prosody.
The modified discrete cosine transform (MDCT) is a transform based on the type-IV discrete cosine transform (DCT-IV), with the additional property of being lapped: it is designed to be performed on consecutive blocks of a larger dataset, where subsequent blocks are overlapped so that the last half of one block coincides with the first half of the next block.
The discrete cosine transform (DCT) is the most widely used transform coding compression algorithm in digital media, followed by the discrete wavelet transform (DWT). Transforms between a discrete domain and a continuous domain are not discrete transforms.
Barnardisation is a method of statistical disclosure control for tables of counts. It involves adding +1, 0 or -1 to some or all of the internal non-zero cells in a table in a pseudo-random fashion. The probability of adjustment for each internal cell is calculated as p/2 (add 1), 1-p (leave as is), p/2 (subtract 1).
An important development in digital image compression technology was the discrete cosine transform (DCT), a lossy compression technique first proposed by Nasir Ahmed while he was working at the Kansas State University in 1972. [13] DCT compression is used in the JPEG image standard, which was introduced by the Joint Photographic Experts Group ...
Instead of embedding in all coefficients of the DCT block, it is applied only to the mid-band DCT coefficients. If X is denoted as the matrix of the mid-band coefficients of the DCT transformed block, then embedding is done with watermark bit 0, and X' is updated as X+∝*PN 0 ,watermarkbit=0 and done with watermark bit 1 and X' is updated as ...