Resolution Enhancement of Images using DTCWT and NLM

  Rahul M Haridas,  Prof. M.R Ingle

Resolution enhancement (RE), a process of improving the quality of an image. Resolution enhancement is basically obtained by regaining high frequency contents of image. Without which the output will be a blurred image. In this paper a new approach in wavelet domain using dual-tree complex wavelet transform (DT-CWT) and nonlocal means (NLM) filter for RE of the images is implemented. An input image is decomposed by DT-CWT to obtain high-frequency sub bands. The high-frequency sub bands and the low-resolution (LR) input image will be interpolated using the bicubic interpolation in proposed work. The high frequency sub bands are passed through an NLM filter to reduce the artifacts generated by DT-CWT. The filtered high-frequency sub bands and the LR part of input image are added using inverse DTCWT for obtaining resolution-enhanced image. DT-CWT provides superior resolution and greater performance ratio because of its nearly shift invariant and directional selective properties. The results are compared in terms of PSNR, MSE for existing techniques.

Keywords- DT-CWT, Bicubic interpolation, RE, NLM, PSNR

Unique Identification Number - IJEDR1401050
Page Number(s) - 295-299
Pubished in - Volume 2 | Issue 1 | March 2014
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  Rahul M Haridas,  Prof. M.R Ingle,   "Resolution Enhancement of Images using DTCWT and NLM", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.2, Issue 1, pp.295-299, March 2014, Available at :http://www.ijedr.org/papers/IJEDR1401050.pdf