Spatiotemporal Pixelization to Increase the Recognition Score of Characters for Retinal Prostheses
AbstractMost of the retinal prostheses use a head-fixed camera and a video processing unit. Some studies proposed various image processing methods to improve visual perception for patients. However, previous studies only focused on using spatial information. The present study proposes a spatiotemporal pixelization method mimicking fixational eye movements to generate stimulation images for artificial retina arrays by combining spatial and temporal information. Input images were sampled with a resolution that was four times higher than the number of pixel arrays. We subsampled this image and generated four different phosphene images. We then evaluated the recognition scores of characters by sequentially presenting phosphene images with varying pixel array sizes (6 × 6, 8 × 8 and 10 × 10) and stimulus frame rates (10 Hz, 15 Hz, 20 Hz, 30 Hz, and 60 Hz). The proposed method showed the highest recognition score at a stimulus frame rate of approximately 20 Hz. The method also significantly improved the recognition score for complex characters. This method provides a new way to increase practical resolution over restricted spatial resolution by merging the higher resolution image into high-frame time slots. View Full-Text
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
Kim, H.S.; Park, K.S. Spatiotemporal Pixelization to Increase the Recognition Score of Characters for Retinal Prostheses. Sensors 2017, 17, 2439.
Kim HS, Park KS. Spatiotemporal Pixelization to Increase the Recognition Score of Characters for Retinal Prostheses. Sensors. 2017; 17(10):2439.Chicago/Turabian Style
Kim, Hyun Seok; Park, Kwang Suk. 2017. "Spatiotemporal Pixelization to Increase the Recognition Score of Characters for Retinal Prostheses." Sensors 17, no. 10: 2439.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.