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

  • Moo-Rak Choi
  • Sung-Jea Ko
  • Goo-Rak Kwon
  • Ramesh Kumar Lama
Article
  • 33 Downloads

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.

Keywords

Image interpolation Adaptive directional wavelet transform Discrete cosine transform Hybrid transforms 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Electrical Engineering DepartmentKorea UniversitySeoulRepublic of Korea
  2. 2.Department Informationand Communication EngineeringChosun UniversityGwangjuSouth Korea
  3. 3.Department of SoftwareGachon UniversitySeongnamRepublic of Korea

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