Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

DCT-Domain Detail Image Enhancement for More Resolved Images

Version 1 : Received: 10 August 2021 / Approved: 13 August 2021 / Online: 13 August 2021 (08:31:37 CEST)

How to cite: Bang, S.; Kim, W. DCT-Domain Detail Image Enhancement for More Resolved Images. Preprints 2021, 2021080286 (doi: 10.20944/preprints202108.0286.v1). Bang, S.; Kim, W. DCT-Domain Detail Image Enhancement for More Resolved Images. Preprints 2021, 2021080286 (doi: 10.20944/preprints202108.0286.v1).

Abstract

This paper develops a detail image signal enhancement that makes images perceived as clearer and more resolved and so is more effective for higher resolution displays. We observe that the local variant signal enhancement makes images more vivid, and the more revealed granular signals harmonically embedded on the local variant signals make images more resolved. Based on this observation, we develop a method that not only emphasizes the local variant signals by scaling up the frequency energy in accordance with human visual perception, but also strengths up the granular signals by embedding the alpha-rooting enhanced frequency components. The proposed energy scaling method emphasizes the detail signals in texture images and rarely boosts noisy signals in plain images. In addition, to avoid the local ringing artifact, the proposed method adjusts the enhancement direction to be parallel to the underlying image signal direction. It was verified through the subjective and objective quality evaluations that the developed method makes images perceived as clearer and highly resolved.

Keywords

Image enhancement; DCT-Domain Perceived Contrast; Perceptual Image Quality

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