DocumentCode :
3274244
Title :
An algorithm to magnify images
Author :
Yamada, Tohru ; Ishii, Rokuya
Author_Institution :
Div. of Electr. & Comput. Eng., Yokohama Nat. Univ., Japan
fYear :
1996
fDate :
2-6 Dec 1996
Firstpage :
674
Lastpage :
677
Abstract :
In this paper, we present a new algorithm to magnify images. Using this algorithm, we can prevent deterioration of image quality when images are magnified. Image details can not be obtained by conventional interpolation method. Therefore, we obtain polynomial approximation of amplitude of low frequency parts, and we expand the approximated curve to high frequency parts. These high frequency components are used as high frequency spectrum. When the amplitude is changed, the phase is also changed because amplitude and phase are not independent of each other. So, phase is changed by this extrapolation process. We propose an algorithm to correct the phase by using Hilbert transform. We apply this algorithm to magnify digital images. Using these techniques, we can obtain higher quality magnified images
Keywords :
Hilbert transforms; approximation theory; extrapolation; image enhancement; polynomials; Hilbert transform; digital images; extrapolation; image magnification; image quality deterioration prevention; low frequency part amplitude; polynomial approximation; Digital images; Discrete Fourier transforms; Extrapolation; Frequency; Image quality; Image sampling; Interpolation; Polynomials; Sampling methods; Zinc;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Technology, 1996. (ICIT '96), Proceedings of The IEEE International Conference on
Conference_Location :
Shanghai
Print_ISBN :
0-7803-3104-4
Type :
conf
DOI :
10.1109/ICIT.1996.601678
Filename :
601678
Link To Document :
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