Sensors, Free Full-Text
This paper introduces an ambient light rejection (ALR) circuit for the autonomous adaptation of a subretinal implant system. The sub-retinal implants, located beneath a bipolar cell layer, are known to have a significant advantage in spatial resolution by integrating more than a thousand pixels, compared to epi-retinal implants. However, challenges remain regarding current dispersion in high-density retinal implants, and ambient light induces pixel saturation. Thus, the technical issues of ambient light associated with a conventional image processing technique, which lead to high power consumption and area occupation, are still unresolved. Thus, it is necessary to develop a novel image-processing unit to handle ambient light, considering constraints related to power and area. In this paper, we present an ALR circuit as an image-processing unit for sub-retinal implants. We first introduced an ALR algorithm to reduce the ambient light in conventional retinal implants; next, we implemented the ALR algorithm as an application-specific integrated chip (ASIC). The ALR circuit was fabricated using a standard 0.35-μm CMOS process along with an image-sensor-based stimulator, a sensor pixel, and digital blocks. As experimental results, the ALR circuit occupies an area of 190 µm2, consumes a power of 3.2 mW and shows a maximum response time of 1.6 s at a light intensity of 20,000 lux. The proposed ALR circuit also has a pixel loss rate of 0.3%. The experimental results show that the ALR circuit leads to a sensor pixel (SP) being autonomously adjusted, depending on the light intensity.
Sensors, Free Full-Text
Sensors, Free Full-Text, rule 63 urban dictionary
Sensors, Free Full-Text, Digitization and Visualization of Greenhouse Tomato Plants in Indoor Environments
Sensors An Open Access Journal from MDPI
Receptor free fluorescent and colorimetric sensors for solution and vapor phase detection of hazardous pollutant nitrobenzene; a new structural approach to design AIEE active and piezofluorochromic sensors - ScienceDirect
Sensors, Free Full-Text, thomas mitchell overton execution
Sensors, Free Full-Text, rule 63 urban dictionary
d10lvax23vl53t.cloudfront.net/images/industryfocus
Sensors, Free Full-Text
Budget-Luxe Sensors, Free Full-Text, continuous blood pressure
Sensors, Free Full-Text, rule 63 urban dictionary
TEKSCAN Pressure Mapping / Force Measurement / Tactile Sensor 3000/P1/1429T1/REG
