Journal of Korea Multimedia Society (한국멀티미디어학회논문지)

Korea Multimedia Society (한국멀티미디어학회)
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A HDR Up-scaling Algorithm Using Undecimated Wavelet Transform and Retinex Method

비간축 웨이브릿 변환과 레티넥스 기법을 이용한 HDR 업스케일링 알고리즘

  • Han, Kyu-Phil (Dept. of Computer Engineering, Kumoh National Institute of Technology)
  • Received : 2022.08.19
  • Accepted : 2022.10.05
  • Published : 2022.10.31
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Abstract

Lately, over 4K high definition and high dynamic range (HDR) display devices are popularized, various interpolation and HDR methods have been researched to expand the size and the dynamic range. Since most of the legacy low resolution (LR) images require both an interpolation and a HDR tone mapping methods, the two processes should be subsequently applied. Therefore, the proposed algorithm presents a HDR up-scaling algorithm using undecimated wavelet transform and Retinex method, which transfers a LR image of low dynamic range (LDR) into the high resolution (HR) with HDR. The proposed algorithm consists of an up-scaling scheme increasing the image size and a tone mapping scheme expanding the dynamic range. The up-scaling scheme uses the undecimated version of the simplest Haar wavelet analysis for the 8-directional interpolation and the change region is extracted during the analysis. This region information is utilized in controlling the surround functions' size of the proposed tone mapping using MSRCR, to enhance the pixels of around the edges that are dominant feature of the subjective image quality. As the results, the proposed algorithm can apply an up-scaling and tone mapping processes in accordance with the type of pixel.

Keywords

Acknowledgement

This research was supported by Kumoh National Institute of Technology (2021).

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