32*32 Pixel Pulse-frequency-modulation Based Image Sensor for Retinal Prosthesis
نویسندگان
چکیده
منابع مشابه
An image sensor based on pulse frequency modulation for retinal prosthesis
We demonstrate an application of a CMOS image sensor using pulse frequency modulation for retinal prosthesis. To increase the sensitivity we use a pulse frequency modulation (PFM) instead of a conventional integration method. The fundamental device characteristics of PFM are described. Based on the results of the PFM pixel circuit, we have fabricated a 128 x 128 pixel array chip using 0.35μm CM...
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This paper describes a retinal prosthetic device using a modified pulse frequency modulation (PFM) based photosensor with a standard CMOS technology. The output waveform of the PFM based photosensor is modified to stimulate retinal cells effectively. Two improvements are achieved. First modification is to restrict the maximum output pulse frequency to protect cells and also to shift photosensit...
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This paper proposes a programmable inhibitory interconnection network between pixels in an array of novel low-voltage Schmitt-trigger-based PFM sensors that will be of interest for future applications in memristor-based early vision processing. In addition, a new low-power inverter-based pulse-frequency modulation (PFM) design and its integration with the network is also presented. To ensure no...
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Inspired by biological information scheme, pulse frequency modulation (PFM) technique is robust for noise sources due to its digital encode of analog signals. In a viewpoint of image sensors, PFM is also useful for a wide dynamic range and has already been demonstrated over 60 dB. We have designed a pixel circuit of a CMOS image sensor using PFM for the next generation architecture of vision ch...
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Retinal degenerative diseases lead to blindness due to loss of the "image capturing" photoreceptors, while neurons in the "image processing" inner retinal layers are relatively well preserved. Electronic retinal prostheses seek to restore sight by electrically stimulating surviving neurons. Most implants are powered through inductive coils, requiring complex surgical methods to implant the coil...
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ژورنال
عنوان ژورنال: The Journal of the Institute of Image Information and Television Engineers
سال: 2004
ISSN: 1881-6908,1342-6907
DOI: 10.3169/itej.58.352