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PDF 137.71 KB
undergraduate thesis
31
11
Discrete cosine transform (DCT)
Darko Jerkić (2014)
Josip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Department of Software Engineering
Chair of Visual Computing
Cite this item:
https://urn.nsk.hr/urn:nbn:hr:200:116739
Metadata
Title
Diskretna kosinusna transformacija (DTC)
Author
Darko Jerkić
Mentor(s)
Irena Galić
(thesis advisor)
Abstract
Kao i druge transformacije, diskretna kosinusna transformacija (DCT) nastoji dekorelirati podatke slike. Nakon dekorelacije svaki transformirani koeficijent može biti kodiran neovisno bez gubitka učinkovitosti kompresije. Karakteristike dekorelacije DCT-a bi treble rezultirati smanjenjem entropije slike. To će, zauzvrat, smanjiti broj bitova potrebnih za prikazivanje slike. Osnovna prednost transformacije slike je uklanjanje redudancije između susjednih piksela. Vrijednosti piksela u jednoj sličici se mogu iskoristiti za predviđanje susjednih piksela naredne sličice. Sličice u video isječku pokazuju veliku vremensku korelaciju. Upravo ovu vremensku korelaciju koristi većina suvremenih sustava za obradu videa. DCT ima nadmoć nad bilo kojim drugim transformacijama slika (Karhunen-Loeve-ovom transformacijom (KLT), diskretnom Fourier-ovom transformacijom (DFT)).
Keywords
The Discrete Cosine Transform (DCT)
decorrelation
transformation
entropy
redundancy.
Parallel title (English)
Discrete cosine transform (DCT)
Committee Members
Irena Galić
(committee chairperson)
Hrvoje Glavaš
(committee member)
Josip Job
(committee member)
Granter
Josip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Lower level organizational units
Department of Software Engineering
Chair of Visual Computing
Place
Osijek
State
Croatia
Scientific field, discipline, subdiscipline
TECHNICAL SCIENCES
Computing
Program Engineering
Study programme type
university
Study level
undergraduate
Study programme
Undergraduate University Study Programme in Computer Engineering
Academic title abbreviation
univ.bacc.ing.comp.
Genre
undergraduate thesis
Language
Croatian
Defense date
2014-10-06
Parallel abstract (English)
Like other transforms, the Discrete Cosine Transform (DCT) attempts to decorrelate the image data. After decorrelation each transform coefficient can be encoded independently without losing compression efficiency. The decorrelation characteristics of DCT should render a decrease in the entropy (or selfinformation) of an image. This will, in turn, decrease the number of bits required to represent the image. The principle advantage of image transformation is the removal of redundancy between neighboring pixels. Pixel values in one frame can be used to predict the adjacent pixels of the next frame. Frames in a video sequence exhibit high temporal correlation. This temporal correlation is employed by most contemporary video processing systems. DCT has the superiority over any other image transforms (The Karhunen-Loeve Transform (KLT), Discrete Fourier Transform (DFT)).
Parallel keywords (Croatian)
diskretna kosinusna transformacija (DCT)
dekorelacija
transformacija
entropija
redundancija.
Resource type
text
Access condition
Open access
Terms of use
URN:NBN
https://urn.nsk.hr/urn:nbn:hr:200:116739
Committer
Anka Ovničević