Parameter-Free Matrix Decomposition for Specular Reflections Removal in Endoscopic Images

Area of Science:

• Medical Imaging
• Computer Vision
• Matrix Algebra

Background:

• Endoscopic imaging is crucial for medical diagnosis but is often degraded by specular reflections (highlights).
• These highlights obscure details, negatively impacting both human interpretation and computer-aided diagnosis systems.
• Existing methods, such as Robust Principal Component Analysis (RPCA), may leave artifacts around highlight regions.

Purpose of the Study:

• To introduce a novel parameter-free matrix decomposition technique for specular reflection removal in endoscopic images.
• To address limitations of previous methods by also removing boundary artifacts around highlights.
• To improve the diagnostic quality of endoscopic images for both clinicians and automated systems.

Main Methods:

• A parameter-free matrix decomposition method is proposed.
• The technique decomposes images into a highlight-free pseudo-low-rank component and a highlight component.
• Evaluation performed on Kvasir Polyp, Kvasir Normal-Pylorus, and Kvasir Capsule datasets, benchmarking against four state-of-the-art approaches.

Main Results:

• The proposed method significantly outperforms compared approaches across three metrics: Structural Similarity Index Measure (SSIM), Percentage of highlights remaining, and Coefficient of Variation (CoV).
• Demonstrated superior performance in removing specular reflections and associated boundary artifacts.
• Statistical validation confirmed the method's superiority over existing state-of-the-art techniques.

Conclusions:

• The developed matrix decomposition technique offers a robust solution for specular reflection removal in endoscopic imaging.
• This advancement leads to enhanced image quality, thereby improving diagnostic efficiency for endoscopists and computer-aided diagnosis.
• The method's ability to handle artifacts alongside highlights represents a significant improvement in the field.