Figure 2.

Stimulation strategies for visual prostheses that use an external camera. A) In the conventional approach implemented by previously commercialized devices such as Alpha-AMS and Argus II, a fixed and simple (e.g., linear) mapping is used to translate the grayscale value of a pixel in each video frame to a current amplitude of the corresponding electrode in the implant. The same encoding is used for all possible use cases. B) In the proposed approach, visual augmentation modes are task-dependent and informed by qualitative feedback as well as behavioral performance of virtual and real prosthesis patients on real-world tasks. The user is able to switch between modes on demand.