Computer Vision System for the Blind Veteran
|Study Design:||Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Supportive Care
|Official Title:||Computer Vision System for the Blind Veteran|
- Frequency of Device Failures Per Attempt to Complete a Navigation Course [ Time Frame: The subject is given as much time as needed to complete the task ]device failures were defined as any failure to provide correct location and direction information at thre appropriate time, resulting in a mistake that needed the initial prototype's ability to meet their travel needs at a good to excellent range.
- Ability to Meet the Subjective Travel Needs of the Blind Subject [ Time Frame: no time limit ]This is a subjective rating that incorporates user friendliness of the system and the specific needs of the subject. The subject is asked to rate whether the device meets his or her travel needs on a 1 to 7 scale with 1 being excellent and 7 being very poor.
|Study Start Date:||November 2011|
|Study Completion Date:||September 2015|
|Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
Experimental: Arm 1 initial system
8 blind subjects are asked to use a prototype computer vision system to determine the challenges facing computer vision based indoor navigation.
Subjects are asked to travel through the hallways of a large hospital from the front entrance to a side entrance. The pathway consists of 9 segments including corners, four-way intersections, and doorways, and the total length of the route was approximately 200 meters. This challenging route was designed to stress the capabilities of the navigation system. It is a route that even sighted persons may find difficult to follow without practice. Pedestrian traffic was present throughout the route and lighting conditions could change in two of the segments where there were windows and doors.
Device: initial system
The computer vision system is used to assist blind subject to navigate an extended path with multiple turns within a hospital setting.The initial prototype system would have been successfully tested for outdoor navigation and basic object recognition tasks.
Experimental: Arm 2 modified system
The system is redesigned in response to problems identified from the first phase of the study. The redesigned system is tested by a second set of 8 blind subjects in the same indoor path as used in Arm 1.
Device: modified system
The problems associated with the initial system were identified and modified. This modified system was tested with a second separate group of subjects. The redesigned system is used to assist blind subject to navigate the same extended path with multiple turns within a hospital setting.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00920231
|United States, Georgia|
|Atlanta VA Medical and Rehab Center, Decatur|
|Decatur, Georgia, United States, 30033|
|United States, Maryland|
|Baltimore VA Medical Center VA Maryland Health Care System, Baltimore, MD|
|Baltimore, Maryland, United States, 21201|
|Principal Investigator:||Cha-Min Tang, PhD MD||Baltimore VA Medical Center VA Maryland Health Care System, Baltimore, MD|