Results 201 to 210 of about 112,080 (220)

JPEG DCT Compressiom

Advanced Materials Research, 2013
With the rapid spread of image processing applications and the further development of multimedia technologies, compression standards become more and more important. This paper intends to explain JPEG (Joint Photographic Experts Group) compression, which is currently a worldwide standard for digital image compression, is based on the discrete cosine ...
Hong Li Jia, Qiang Liu
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Two Stage Color Image Steganography Using DCT (TSCIS-DCT)

2013
In frequency domain steganography, use of color images for secret data hiding may prove to be a decisive innovation. The proposed concept uses two color images for hiding a color/gray authenticating message/image. The mathematical technique of Discrete Cosine Transform (DCT) is applied on each block of size 2x2 taken in row major order from three color
Anirban Goswami, Dipankar Pal, Nabin Ghoshal   +2 more
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The discrete cosine transform DCT-4 and DCT-8

Proceedings of the 4th international conference conference on Computer systems and technologies e-Learning - CompSysTech '03, 2003
In paper two types of the discrete cosine (end sine) transforms (DCT/DST) are analyzed on the base of the linear representations of finite groups and geometrical approach. This transforms are useful for multirate systems, adaptive filtering and compression of speech signals and images.
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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
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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
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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
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DCT module

Computer Standards & Interfaces, 1999
Ch.-Y. Lu, K.-A. Wen
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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.
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Indexation Basée-Région d’Image Utilisant Shape-Adaptive DCT (SA-DCT)

2015
Ce papier propose une nouvelle approche dans le domaine de la recherche d’images par région (RBIR), utilisant la transformation cosinus discrète adaptée aux objets (SA-DCT). Dans ce système de recherche, une image a une segmentation a priori (alpha-plane), tel qu’il a était définit dans MPEG-4.
Belalia, Amina, Belloulata, Kamel, Kpalma, Kidiyo   +2 more
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AREA AND POWER EFFICIENT ARCHITECTURE FOR DCT DCT FORMULA AND ITS ARCHITECTURES Parallel Architecture of DCT Distributed Architecture of DCT

2013
Pranav Pawar, Mohit Kulkarni, Atili Ramkiran   +2 more
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