제 목 : Background De-Cluttering for Visual Prostheses

강 사 : Dr. Jae-Hyun Jung (Harvard Medical School, USA)

시 간 : 2018년 7월 23일 월요일 오전 10시

장 소 : 제1신공학관 301동 1112호

Abstract
Current prosthetic vision systems and other sensory substitution devices all have low resolution and limited dynamic range that severely restrict their utility. Better imaging system could help overcome some of these limitations. We proposed methods to effectively suppress background clutter and isolate the object of interest (OI), background de-cluttering, to improve prostheses’ functionality.
Background de-cluttering may be achieved by motion parallax caused by the user’s head movement, which facilitates separation of objects at various distances. In human vision, observers can keep fixation on an OI while moving the head (gaze locking) aided by the ocular-vestibular reflex that rotates the eyes in response to head movement. However, the head-mounted camera in visual prostheses continues to be pointed straight during the head movement (translation) and does not rotate as the eyes do during similar head movements. We proposed a compensatory cropping method as a fixation aid to automatically compensate for the head movement and demonstrated the effect with the camera of visual prostheses.
Background de-cluttering also can be implemented by improving the camera and image processing. We proposed an active confocal imaging system based on light-field technology that would enable a blind user of any visual prosthesis to efficiently scan, focus on, and "see" only an OI while suppressing interference from background clutter. We developed the prototype confocal imaging system and demonstrated the background de-cluttering performance for two practical use cases (within arm length and for mobility).
 
Biography
B.Sc., Electrical Engineering, Pusan National University, Korea (02/2007)
Ph.D., Electrical Engineering, Seoul National University, Korea (08/2012)
Postdoc Fellow, Schepens Eye Research Institute, Harvard Medical School (12/2012-10/2015)
Instructor (Tenure-track faculty), Department of Ophthalmology, Harvard Medical School (10/2015 – present)
Investigator, Schepens Eye Research Institute, Mass. Eye and Ear (10/2015 – present)

Honors (Selected)
Fight for Sight Grant-in-aid Award, Fight for Sight (2018)
Alice J. Adler Award, Harvard Medical School (2017)
Best Paper of the Year, Schepens Eye Research Institute, Harvard Medical School (2015)
Basic Research Postdoctoral Fellowship, National Research Foundation of Korea (2012)
Merck Young Scientist Award, Society for Information Display (2009)