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** A secondary Hadamard transform performed on " DC " coefficients of the primary spatial transform applied to chroma DC coefficients ( and also luma in one special case ) to obtain even more compression in smooth regions.
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** and Hadamard
** Hadamard product,
** and transform
** Modified discrete cosine transform Description
** Fourier transform: Continuous Fourier transform & Discrete Fourier transform
** Laplace transform
** Che-Hong Chen, Bin-Da Liu, and Jar-Ferr Yang, " Recursive architectures for realizing modified discrete cosine transform and its inverse ," IEEE Trans.
** An exact-match integer 4 × 4 spatial block transform, allowing precise placement of residual signals with little of the " ringing " often found with prior codec designs.
** An exact-match integer 8 × 8 spatial block transform, allowing highly correlated regions to be compressed more efficiently than with the 4 × 4 transform.
** Adaptive encoder selection between the 4 × 4 and 8 × 8 transform block sizes for the integer transform operation.
** Context-adaptive variable-length coding ( CAVLC ), which is a lower-complexity alternative to CABAC for the coding of quantized transform coefficient values.
** Arbitrary shapes ( generalized Hough transform )
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** Fast Fourier transform
** Discrete Fourier transform
** Discrete cosine transform
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** S transform has been proven to be able to identify a few types of disturbances, like voltage sag, voltage swell, momentary interruption, and oscillatory transients.
** S transform can also be applied for other types of disturbances such as notches, harmonics with sag and swells etc.
** S transform generates contours which are suitable for simple visual inspection.
** Bilinear transform
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