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Color image interpolation in the DCT domain using a wavelet-based differential value

Authors
Choi, Moo-RakKo, Sung-JeaKwon, Goo-RakLama, Ramesh Kumar
Issue Date
8월-2018
Publisher
SPRINGER
Keywords
Image interpolation; Adaptive directional wavelet transform; Discrete cosine transform; Hybrid transforms
Citation
MULTIMEDIA TOOLS AND APPLICATIONS, v.77, no.16, pp.21539 - 21556
Indexed
SCIE
SCOPUS
Journal Title
MULTIMEDIA TOOLS AND APPLICATIONS
Volume
77
Number
16
Start Page
21539
End Page
21556
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/74288
DOI
10.1007/s11042-018-5616-2
ISSN
1380-7501
Abstract
We propose a new image-interpolation technique using a combination of an adaptive directional wavelet transform (ADWT) and discrete cosine transform (DCT). In the proposed method, we use ADWT to decompose the low-resolution image into different frequency subband images. The high-frequency subband images are further transformed to DCT coefficients, and the zero-padding method is used for interpolation. Simultaneously, the low-frequency subband image is replaced by the original low-resolution image. Finally, we generate the interpolated image by combining the original low-resoultion image and the interpolated subband images by using inverse DWT. Experimental results demonstrate that the proposed algorithm yields better quality images in terms of subjective and objective quality metrics compared to the other methods considered in this paper.
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