Performance simulation of retinal partial operations in “on” - and “off” -centers

Castillo-Cabrera, G.; Reyes-Barranca, M. A.; Garcia-Lamont, Jair

doi:10.1109/iceee.2009.5393316

Cited by 1 publication

(2 citation statements)

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“…The main characteristics of the retina´s receptive field were reported recently [1]. They are summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…However, in practice whether the center or the surrounding of a receptive field is more illuminated, can be determined through gradient computations, in a wide continuous range of illumination. The model was reported in a previous work [1]. Regarding biological threshold of a neuron (δ), if the firing threshold 0 > δ , then the model's behavior is summarized in Table 2.…”

Section: Introductionmentioning

confidence: 99%

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Electronic architecture for an analog retinal processing prototype suitable to be implemented on standard CMOS technology

Castillo-Cabrera

Reyes-Barranca

Garcia-Lamont

et al. 2011

2011 8th International Conference on Electrical Engineering, Computing Science and Automatic Control

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An analog architecture of optic signal processing is presented in this work, with the goal to emulate one of the much processes involved in a biological retina. Here we have considered that the receptive field is the main unit of processing in the visual system. So, the proposed architecture tries to give partial solution to the properties of a receptive field in order to give some help to people with retinal diseases in the future. A receptive field is represented by an array of 3x3 pixels and four main mathematical operations are carried out on each one pixel. This means that image processing is developed at pixel level. Operations involved are: (1) phototransduction by photocurrent integration; (2) Average of the signals coming from the eight neighbouring pixels, obtained by a neu-NMOS (ν-NMOS) neuron; (3) The gradient between central pixel and the average value from neighboring pixels. This operation is done by a comparator; (4) a generator of impulses whose density is proportional to the gradient. The coupling methodology among every block or module, and the PSPICE simulation using the technology parameters of 0.5μm are the main objectives in this work.

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“…The main characteristics of the retina´s receptive field were reported recently [1]. They are summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electronic architecture for an analog retinal processing prototype suitable to be implemented on standard CMOS technology

Castillo-Cabrera

Reyes-Barranca

Garcia-Lamont

et al. 2011

2011 8th International Conference on Electrical Engineering, Computing Science and Automatic Control

View full text Add to dashboard Cite

show abstract

Performance simulation of retinal partial operations in “on” - and “off” -centers

Cited by 1 publication

References 25 publications

Electronic architecture for an analog retinal processing prototype suitable to be implemented on standard CMOS technology

Electronic architecture for an analog retinal processing prototype suitable to be implemented on standard CMOS technology

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