undergraduate thesis
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
Metadata
TitleDiskretna kosinusna transformacija (DTC)
AuthorDarko 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)).
KeywordsThe Discrete Cosine Transform (DCT) decorrelation transformation entropy redundancy.
Parallel title (English)Discrete cosine transform (DCT)
Committee MembersIrena Galić (committee chairperson)
Hrvoje Glavaš (committee member)
Josip Job (committee member)
GranterJosip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Lower level organizational unitsDepartment of Software Engineering
Chair of Visual Computing
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineTECHNICAL SCIENCES
Computing
Program Engineering
Study programme typeuniversity
Study levelundergraduate
Study programmeUndergraduate University Study Programme in Computer Engineering
Academic title abbreviationuniv.bacc.ing.comp.
Genreundergraduate thesis
Language Croatian
Defense date2014-10-06
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 typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:200:116739
CommitterAnka Ovničević