Image Processing for a High-Resolution Optoelectronic Retinal Prosthesis
نویسندگان
چکیده
منابع مشابه
Design of a high-resolution optoelectronic retinal prosthesis.
It has been demonstrated that electrical stimulation of the retina can produce visual percepts in blind patients suffering from macular degeneration and retinitis pigmentosa. However, current retinal implants provide very low resolution (just a few electrodes), whereas at least several thousand pixels would be required for functional restoration of sight. This paper presents the design of an op...
متن کاملOptoelectronic retinal prosthesis: system design and performance.
The design of high-resolution retinal prostheses presents many unique engineering and biological challenges. Ever smaller electrodes must inject enough charge to stimulate nerve cells, within electrochemically safe voltage limits. Stimulation sites should be placed within an electrode diameter from the target cells to prevent 'blurring' and minimize current. Signals must be delivered wirelessly...
متن کاملHigh Resolution Implantable Microsystem and Probe Design for Retinal Prosthesis
By a retinal prosthesis, the researchers have been able to stimulate a limited number of neurons (around 100) by biphasic current stimulus to reproduce an image spatially by multiplexing technique. For functional restoration of sight (visual acuity 20/80), we are to stimulate at least 2500 neurons/mm². We are far behind that target. The time required by biphasic current stimulus, the sequential...
متن کاملMigration of retinal cells through a perforated membrane: implications for a high-resolution prosthesis.
PURPOSE One of the critical difficulties in design of a high-resolution retinal implant is the proximity of stimulating electrodes to the target cells. This is a report of a phenomenon of retinal cellular migration into a perforated membrane that may help to address this problem. METHODS Mylar membranes with an array of perforations (3-40 microm in diameter) were used as a substrate for in vi...
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Spatial image processing chips, known as silicon retinas, are based on the architecture of vertebrate retina and can be mathematically represented as the Laplacian of Gaussian (LOG) and Difference of Gaussian (DOG). In this paper, attention has been paid on implementing a retina function through the LOG model. Previous implementations have used a hexagonal resistive mesh within the pixel array,...
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ژورنال
عنوان ژورنال: IEEE Transactions on Biomedical Engineering
سال: 2007
ISSN: 0018-9294
DOI: 10.1109/tbme.2007.894828