Results 301 to 310 of about 133,828 (342)

Quantum multi-image compression-encryption scheme based on quantum discrete cosine transform and 4D hyper-chaotic Henon map

Quantum Information Processing, 2021
Jing-Yi Dai, Yan Ma, Nanrun Zhou
semanticscholar   +1 more source

The discrete cosine transform--A new version

ICASSP '83. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005
A new version of the discrete cosine transform (DCT) is introduced. The performance of this new version of the DCT for digital filtering and transform coding is compared to the old version of DCT [1] with various criteria; i.e., variance distribution, residual correlation, Wiener filtering, and maximum-reducible-bits.
Zhongde Wang, Bobby R. Hunt
openaire   +1 more source

On computing the discrete Fourier and cosine transforms

IEEE Transactions on Acoustics, Speech, and Signal Processing, 1985
An efficient algorithm based on real matrix decomposition is developed for computing a class of sinusoidal transforms, that include the discrete Fourier and cosine transform.
openaire   +1 more source

Discrete Cosine Transform (DCT)

Encyclopedia of Multimedia, 2021
M. Bader
semanticscholar   +1 more source

On the discrete cosine transform and OFDM systems

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004
A method for using the discrete cosine transform (DCT) as an alternative to the discrete Fourier transform (DFT) for orthogonal frequency division multiplexing (OFDM) wireless transmission methods is presented. These transforms satisfy the cyclic convolution properties of the DFT when used with a symmetric extension.
openaire   +1 more source

Pruning the fast discrete cosine transform

IEEE Transactions on Communications, 1991
The matrix representation of the simple structured algorithm for the discrete cosine transform (DCT), which was first introduced by Y. Morikawa et al. (1985) based on the successive order reduction of the Tchebycheff polynomial, and retrieved by a simpler approach by Z. Wang (1988), is reviewed. A fast pruning algorithm for the DCT is then developed. >
openaire   +1 more source

Medical image encryption using fractional discrete cosine transform with chaotic function

Medical and Biological Engineering and Computing, 2019
Sumit Kumar, Bhaskar Panna, R. K. Jha
semanticscholar   +1 more source

Discrete Cosine Stockwell Transform vs. Discrete Cosine Transform in Despeckling OCT images

2023 International Conference on Electrical, Computer and Energy Technologies (ICECET), 2023
Jawad F. Al-Asad, Hiren K. Mewada, Aymen Flah, Amit V. Patel   +3 more
openaire   +1 more source

A robust technique for copy-move forgery detection and localization in digital images via stationary wavelet and discrete cosine transform

Journal of Visual Communication and Image Representation, 2018
Toqeer Mahmood, Zahid Mehmood, Mohsin Shah, T. Saba   +3 more
semanticscholar   +1 more source

Detection of copy-move image forgery based on discrete cosine transform

Neural computing & applications (Print), 2018
Mohammed Hazim Alkawaz, G. Sulong, T. Saba, A. Rehman   +3 more
semanticscholar   +1 more source