Results 281 to 290 of about 152,070 (321)

Secure and robust color image dual watermarking based on LWT-DCT-SVD

Multimedia tools and applications, 2021
Aditi Zear, P. Singh
semanticscholar   +1 more source

Systolic CORDIC DCT: an effective method for computing 2d-DCT

Seventh International Symposium on Signal Processing and Its Applications, 2003. Proceedings., 2003
The 2D-DCT is used in image and speech processing for real-time application. In this paper a new hardware method is proposed for computing 2D-DCT. The hardware employs systolic array for doing recursive equation and use a CORDIC algorithm for determining some part of computation. So the method is called systolic CORDlC DCT or SCDCT.
A. Khayatzadeh, H.S. Shahhoseini, M. Naderi   +2 more
openaire   +1 more source

Diskrete Kosinustransformation (DCT)

2015
Die Fouriertransformation und die DFT sind fur die Verarbeitung komplexwertiger Signale ausgelegt und erzeugen immer ein komplexwertiges Spektrum, auch wenn das ursprungliche Signal ausschlieslich reelle Werte aufweist. Der Grund dafur ist, dass weder der reelle noch der imaginare Teil des Spektrums allein ausreicht, um das Signal vollstandig ...
Wilhelm Burger, Mark James Burge
openaire   +1 more source

Blind Image Quality Assessment: A Natural Scene Statistics Approach in the DCT Domain

IEEE Transactions on Image Processing, 2012
Michele A. Saad, A. Bovik, C. Charrier
semanticscholar   +1 more source

The Discrete Cosine Transform (DCT)

2009
The Fourier transform and the DFT are designed for processing complex-valued signals, and they always produce a complex-valued spectrum even in the case where the original signal was strictly realvalued. The reason is that neither the real nor the imaginary part of the Fourier spectrum alone is sufficient to represent (i.e., reconstruct) the signal ...
Wilhelm Burger, Mark J. Burge
openaire   +1 more source

A novel hybrid DCT and DWT based robust watermarking algorithm for color images

Multimedia tools and applications, 2019
Ahmed Khaleel Abdulrahman, Serkan Öztürk   +1 more
semanticscholar   +1 more source

DCT module

Computer Standards & Interfaces, 1999
Ch.-Y. Lu, K.-A. Wen
openaire   +1 more source

A novel hybrid of DCT and SVD in DWT domain for robust and invisible blind image watermarking with optimal embedding strength

Multimedia tools and applications, 2018
Xiao-bing Kang, Fan Zhao, Guangfeng Lin, Yajun Chen   +3 more
semanticscholar   +1 more source

The Continuous DCT

1997
Abstract This is a parallel problem to that which the convergence theorems are designed to solve, the difference being that here we have a limit involving a continuous variable, namely h, while before we had a discrete variable, n. Thus we need convergence theorems with a continuous variable.
openaire   +1 more source

Digital image watermarking method based on DCT and fractal encoding

IET Image Processing, 2017
Shuai Liu, Zheng Pan, Houbing Song
semanticscholar   +1 more source