Results 281 to 290 of about 123,647 (323)
Some of the next articles are maybe not open access.
On the embedding limits of the discrete cosine transform
Multimedia Tools and Applications, 2015This paper investigates the embedding capacity limits of high-capacity data hiding in color images based on a locally Adaptive-Region Discrete Cosine Transform (AR-DCT) frequency domain data hiding scheme, and explores the relationship between hiding capacity and image quality.
Tamer Rabie, Ibrahim Kamel
openaire +1 more source
Interesting properties of the discrete cosine transform
Journal of Visual Communication and Image Representation, 1992Among the various image data compression methods, the discrete cosine transform (DCT) has emerged as a popular method in gray-scale image compression. This paper presents detailed analyses of several interesting properties of the DCT, which can be described in three parts: the frequency characteristics, the filtering properties, and the subband ...
H. S. Hou, D. R. Tretter, M. J. Vogel
openaire +1 more source
2D lossless discrete cosine transform
Proceedings 2001 International Conference on Image Processing (Cat. No.01CH37205), 2002Since the lossless DCT is compatible with JPEG or MPEG, it is expected to play an important role in unified lossless/lossy image coding. However, there is a problem that the difference between the transform coefficients of the lossless DCT and those of the (lossy) DCT is not very small. We present the design of a two dimensional lossless DCT based on a
Kunitoshi Komatsu, Kaoru Sezaki
openaire +1 more source
Efficient Recursive Algorithm for Discrete Cosine Transform and Inverse Discrete Cosine Transform
2018 International Conference on Sustainable Energy, Electronics, and Computing Systems (SEEMS), 2018In this paper, efficient algorithms based on recursive technique are proposed for even length Discrete cosine Transform (DCT) and Inverse Discrete Cosine Transform (IDCT). The recursive relations are derived to compute N-point DCT and IDCT coefficients by utilizing $\frac {N}{1}$execution cycles per transform coefficient.
Pragati Dahiya, Priyanka Jain
openaire +1 more source
Fast algorithms for the discrete cosine transform
IEEE Transactions on Signal Processing, 1992zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ephraim Feig, Shmuel Winograd
openaire +2 more sources
The discrete cosine transform--A new version
ICASSP '83. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005A 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
Pruning the fast discrete cosine transform
IEEE Transactions on Communications, 1991The 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
Forgery detection in digital images via discrete wavelet and discrete cosine transforms
Computers & electrical engineering, 2017Khizar Hayat, Tanzeela Qazi
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)., 2004A 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