Skip to main content

WPI - Computer Science Department, MS Thesis Presentation , Songlin How "HDR-Like Image Generation to Mitigate Adverse Wound Illumination Using Deep Bi-directional Retinex and Exposure Fusion"

Tuesday, May 04, 2021
5:00 pm to 6:00 pm


Songlin Hou

MS Student

WPI – Computer Science Department


Tuesday, May 4, 2021

Time: 5:00 p.m. – 6:00 p.m

Zoom Link:

Zoom Meeting ID: 910 822 3465

Zoom Passcode: 935197


Advisors: Prof. Emmanuel O. Agu and Prof. Clifford Lindsay

Reader: Prof. Michael Gennert


Periodic assessment is necessary to monitor the healing progress of chronic wounds. Image analyses using computer vision algorithms have recently emerged as a viable alternative that has been demonstrated by prior work. However, the performances of such image analysis methods degrade on images captured in adverse illumination, which is common in many indoor environments. To mitigate these lighting problems, High Dynamic Range (HDR) image enhancement techniques can be used to mitigate over- and under-exposure issues and preserve the details of scenes captured in non-ideal illumination.

In this paper, we address  over- and under-exposure simultaneously using a deep learning-based bi-directional illumination enhancement network based on retinex theory. Over- and under-exposed images are generated, which are then fused into a final image with enhanced illumination in an exposure fusion step. Our proposed method outperformed the state-of-the-art on various metrics including structure similarity, peak signal-noise ratio and changes in segmentation accuracy (SSIM scores 0.76/0.69 on bright/dark images, PSNR scores 28.60 on dark images and DSC scores 0.76/0.74 on bright/dark images).