Download e-book for iPad: Discrete cosine and sine transforms: general properties, by Vladimir Britanak

By Vladimir Britanak

ISBN-10: 0080464645

ISBN-13: 9780080464640

ISBN-10: 0123736242

ISBN-13: 9780123736246

The Discrete Cosine rework (DCT) is utilized in many purposes through the medical, engineering and learn groups and in information compression particularly. speedy algorithms and functions of the DCT sort II (DCT-II) became the center of many proven overseas image/video coding criteria. on account that then other kinds of the DCT and Discrete Sine remodel (DST) were investigated intimately. This new version provides the total set of DCT and DST discrete trigonometric transforms, together with their definitions, common mathematical houses, and relatives to the optimum Karhunen-Loéve remodel (KLT), with the emphasis on quickly algorithms (one-dimensional and two-dimensional) and integer approximations of DCTs and DSTs for his or her effective implementations within the integer area. DCTs and DSTs are real-valued transforms that map integer-valued indications to floating-point coefficients. To get rid of the floating-point operations, numerous equipment of integer approximations were proposed to build and flexibly generate a relatives of integer DCT and DST transforms with arbitrary accuracy and function. The integer DCTs/DSTs with reasonably cheap and low-powered implementation can substitute the corresponding real-valued transforms in instant and satellite tv for pc conversation platforms in addition to transportable computing functions. The publication is largely a close day trip on orthogonal/orthonormal DCT and DST matrices, their matrix factorizations and integer aproximations. it truly is was hoping that the publication will function a worthy reference for undefined, academia and learn institutes in constructing integer DCTs and DSTs in addition to an proposal resource for additional complicated examine. Key beneficial properties - Presentation of the full set of DCTs and DSTs in context of whole type of discrete unitary sinusoidal transforms: the starting place, definitions, common mathematical houses, mutual relationships and relatives to the optimum Karhunen-Loéve remodel (KLT). - Unified remedy with the short implementations of DCTs and DSTs: the short rotation-based algorithms derived within the kind of recursive sparse matrix factorizations of a rework matrix together with one- and two-dimensional situations. - designated presentation of varied equipment and layout techniques to integer approximation of DCTs and DSTs using the fundamental options of linear algebra, matrix thought and matrix computations resulting in their effective multiplierless real-time implementations, or quite often reversible integer-to-integer implementations. - finished record of extra references reflecting recent/latest advancements within the effective implementations of DCTs and DSTs typically one-, two-, 3- and multi-dimensional speedy DCT/DST algorithms together with the hot energetic study themes for the period of time from 1990 in past times.

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Extra resources for Discrete cosine and sine transforms: general properties, fast algorithms and integer approximations

Example text

1) whose samples are correlated. We seek to transform this vector by a linear transformation WT so that the transformed vector will have samples that are not correlated. 2) so that the correlation matrix based on the vector y is strictly diagonal, or E[yyT ] = diag(λ0 , λ1 , . . 3) where diag(·) indicates a diagonal matrix and E[·] is the expectation operator. 3) relates this back to the original vector x as follows: E[WT x(WT x)T ] = WT E[xxT ]W = diag(λ0 , λ1 , . . , λN−1 ). 4) Denoting the correlation matrix E[xxT ] for the vector x by A, and letting wn be the n-th column in the matrix W, the following eigenvalue problem is obtained: Awn = λn wn , n = 0, 1, .

They arise naturally from the discretized solutions of the undamped harmonic oscillator equation together with certain homogeneous boundary conditions. The following discussion follows very closely the presentation made by Strang [1]. Consider first the second-order eigenvalue problem: u + λu = 0 on the domain x ∈ [0, π]. 46) The boundary condition of u (0) = 0 at x = 0 will generate the cos(kx) as eigenfunctions with λ = k 2 as eigenvalues. The additional boundary condition of u (π) = 0 at the other end will determine the eigenvalues with k = 0, ±1, ±2, .

Given a random signal vector x, its correlation matrix is first estimated using the definition E[xxT ]. 5), this matrix is diagonalized. 2). 5) will result in a real unitary transform matrix W (see Appendix A for detail). 5) are essentially the variances of the vector y. From an information point of view, the higher the variance the higher is the information content. As such, the magnitude of the eigenvalue is an indication of the importance of the corresponding eigenvector wn in the reconstruction of the signal vector x.

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Discrete cosine and sine transforms: general properties, fast algorithms and integer approximations by Vladimir Britanak


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