A Contrast Enhancement Framework with JPEG Artifacts Suppression

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• 作者：Yu Li (19)
  Fangfang Guo (19)
  Robby T. Tan (20)
  Michael S. Brown (19)
  
• 关键词：Contrast Enhancement ; Dehazing ; JPEG Artifacts Removal ; Deblocking
• 刊名：Lecture Notes in Computer Science
• 出版年：2014
• 出版时间：2014
• 年：2014
• 卷：8690
• 期：1
• 页码：174-188
• 全文大小：3,623 KB
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• 作者单位：Yu Li (19)
  Fangfang Guo (19)
  Robby T. Tan (20)
  Michael S. Brown (19)
  
  19. National University of Singapore, Singapore
  20. SIM University, Singapore
  
• ISSN：1611-3349

文摘

Contrast enhancement is used for many algorithms in computer vision. It is applied either explicitly, such as histogram equalization and tone-curve manipulation, or implicitly via methods that deal with degradation from physical phenomena such as haze, fog or underwater imaging. While contrast enhancement boosts the image appearance, it can unintentionally boost unsightly image artifacts, especially artifacts from JPEG compression. Most JPEG implementations optimize the compression in a scene-dependent manner such that low-contrast images exhibit few perceivable artifacts even for relatively high-compression factors. After contrast enhancement, however, these artifacts become significantly visible. Although there are numerous approaches targeting JPEG artifact reduction, these are generic in nature and are applied either as pre- or post-processing steps. When applied as pre-processing, existing methods tend to over smooth the image. When applied as post-processing, these are often ineffective at removing the boosted artifacts. To resolve this problem, we propose a framework that suppresses compression artifacts as an integral part of the contrast enhancement procedure. We show that this approach can produce compelling results superior to those obtained by existing JPEG artifacts removal methods for several types of contrast enhancement problems.