Bio-Inspired Asynchronous Pixel Event Tricolor Vision Sensor

Leñero‐Bardallo, Juan A.; Bryn, D. H.; Häfliger, Philipp

doi:10.1109/tbcas.2013.2271382

Cited by 34 publications

(29 citation statements)

References 17 publications

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“…3. Sensors built with these kind of pixels are also known as 'octopus' retinas [9]- [11]. There are multiple possible topologies for the pixel design.…”

Section: Pixel Designmentioning

confidence: 99%

“…As a result, they provide a reduced output data flow and fast operation. Among the event based sensors, the luminance sensors, also known as octopus retinas [9]- [11], are sensors whose pixels send events with a frequency proportional to illumination. Hence, their nature is especially suitable for the design of efficient sun sensors, overcoming some of the limitations of the previous reported ones, i.e.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sun Sensor Based on a Luminance Spiking Pixel Array

Leñero‐Bardallo¹,

Farian²,

Guerrero-Rodríguez³

et al. 2017

IEEE Sensors J.

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Abstract-We present a novel sun sensor concept. It is the very first sun sensor built with an Address Event Representation (AER) spiking pixel matrix. Its pixels spike with a frequency proportional to illumination. It offers remarkable advantages over conventional digital sun sensors based on Active Pixel Sensor (APS) pixels. Its output data flow is quite reduced. It is possible to resolve the sun position just receiving one single event operating in Time-to-First-Spike (TFS) mode. It operates with a latency in the order of milliseconds. It has higher dynamic range than APS image sensors (higher than 100dB). A custom algorithm to compute the centroid of the illuminated pixels is presented. Experimental results are provided.

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“…3. Sensors built with these kind of pixels are also known as 'octopus' retinas [9]- [11]. There are multiple possible topologies for the pixel design.…”

Section: Pixel Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sun Sensor Based on a Luminance Spiking Pixel Array

Leñero‐Bardallo¹,

Farian²,

Guerrero-Rodríguez³

et al. 2017

IEEE Sensors J.

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“…NIR LEDs). In our particular case, we developed a system (Leñero-Bardallo et al 2013) with an event-based sensor to monitor the temporal variations of the visual scene provoked by flames. Flames have frequency components within the interval [0, 250] Hz and their flickering can easily be tracked with an asynchronous sensor.…”

Section: Fire Detection In the Nir Bandmentioning

confidence: 99%

“…Traditionally CMOS cameras with NIR filters have been employed (Yan et al 2006). As an alternative to this traditional approach, recently we proposed an bio-inspired event-based system to monitor flame activity without using optic filters (Leñero-Bardallo et al 2013). The idea behind this method was to compare the photocurrents of stacked photodiodes at different depths.…”

Section: Introductionmentioning

confidence: 99%

Fire detection with a frame-less vision sensor working in the NIR band

Leñero‐Bardallo¹,

Fernández-Berni²,

Rodríguez-Vázquez³

et al. 2014

Advances in Forest Fire Research

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This paper draws the attention of the community about the capabilities of an emerging generation of bio-inspired vision sensors to be used in fire detection systems. Their principle of operation will be described. Moreover experimental results showing the performance of an eventbased vision sensor will be provided. The sensor was intended to monitor flames activity without using optic filters. In this article, we will also extend this preliminary work and explore how its outputs can be processed to detect fire in the environment. IntroductionInfrared cameras can easily detect fire and hot spots. Unfortunately, they are expensive, difficult to handle, and fragile (Briz et al. 2003). For this reason, CMOS cameras are still preferred for some applications where it is not strictly necessary operating in the whole infrared band, (Cheon et al. 2009, Naoult et al. 2007, Bendiscio et al. 1998, Fernandez-Berni et al. 2012. Silicon can detect Near Infrared Radiation (NIR) within the band [700 1,100] nm. This property can be exploited to monitor flame and fire activity.Flames have a very characteristic oscillatory behavior. They flicker with certain frequency components that depend on their nature. The study of these frequency components is interesting for industrial processes and applications. Traditionally CMOS cameras with NIR filters have been employed (Yan et al. 2006). As an alternative to this traditional approach, recently we proposed an bio-inspired event-based system to monitor flame activity without using optic filters (Leñero-Bardallo et al. 2013). The idea behind this method was to compare the photocurrents of stacked photodiodes at different depths. The top one was more sensitive to shorter wavelengths and the bottom one was more sensitive to longer wavelengths, having a very good sensitivity within the NIR band. Just comparing the difference between their photocurrents, we were able to determine if the incident radiation was within the NIR band without optic filters. Moreover, we could process with a real-time algorithm the temporal variations of the NIR levels in the visual scene provoked by flames and compute their frequency components values. This paper studies how the prior work to monitor flame activity could be extended to detect fire in the environment and emit an alarm in case. We will show that the previously implemented algorithm outputs can be processed to detect fire with a low computational load. Up

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“…The AC performance of the detector is characterised at three wavelengths, blue (410 nm), green (520 nm) and red (675 nm). The measurements are carried out with a high dynamic range to fully characterise possible interactions between the different wavelengths (cross-coupling mechanisms).Introduction: Double [1, 2], triple [3][4][5] or quad [6] junction photodiodes (PDs) are often used in sensor applications where a colour detector is needed. These PDs are formed by stacking two, three or four PD junctions vertically.…”

mentioning

confidence: 99%

AC response of 0.35 µm CMOS triple‐junction photodetector

Schidl

Zimmermann

2014

Electron. lett.

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A vertically stacked triple-junction photodiode (PD) is characterised for its suitability for sensor applications which demand a high speed. The proposed PD is implemented in a 0.35 µm CMOS process without process modifications. The AC performance of the detector is characterised at three wavelengths, blue (410 nm), green (520 nm) and red (675 nm). The measurements are carried out with a high dynamic range to fully characterise possible interactions between the different wavelengths (cross-coupling mechanisms).Introduction: Double [1, 2], triple [3][4][5] or quad [6] junction photodiodes (PDs) are often used in sensor applications where a colour detector is needed. These PDs are formed by stacking two, three or four PD junctions vertically. The wanted colour dependency is based on the wavelength-dependent penetration depth of light in silicon. The basic working principle is well understood and widely published. All these applications have one aspect in common. These applications only need a low-speed PD. However for some applications, the speed of the used PD is also of interest. Only a few published papers focus on this topic. Schidl et al.[4] focuses on the transient response (0.6 µm BiCMOS triple-junction PD) and [3] focuses on the cutoff frequency at one wavelength (90 nm CMOS triple-junction PD). The results in these published papers indicate that there are some interesting properties not fully characterised yet. For instance, one interesting question is whether there is a (capacitive) interaction between the PD junctions at higher frequencies. Therefore, we have chosen to characterise a new 0.35 µm CMOS triple-junction PD in the frequency domain with different wavelengths of the incident light. In this Letter, we quantify the interaction between the different PD junctions and discuss the implications for possible applications of this PD.

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Bio-Inspired Asynchronous Pixel Event Tricolor Vision Sensor

Cited by 34 publications

References 17 publications

Sun Sensor Based on a Luminance Spiking Pixel Array

Sun Sensor Based on a Luminance Spiking Pixel Array

Fire detection with a frame-less vision sensor working in the NIR band

AC response of 0.35 µm CMOS triple‐junction photodetector

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