By Joao Carlos Martins, Leonel Augusto Sousa
This ebook presents a valid mathematical and technical standpoint in useful and structural retina versions, provides evaluate metrics to evaluate these types, and offers insights concerning the types implementation. It starts off by way of introducing the retina anatomy and its workings in an in depth method appropriate for an engineering viewers, whereas delivering the mathematical research of the retina neural reaction. additionally, it explores and establishes a framework for the comparability of retina versions by means of organizing a collection of metrics for trying out and comparing the several types. The ebook follows a sign processing standpoint, the place all versions and metrics are discretized that allows you to be carried out and established in a electronic approach, comparable to a working laptop or computer or a really good committed machine. Contents: creation to Bioelectronic imaginative and prescient; The Human visible procedure; Characterization of the Neural reaction; Retina versions; Neural task Metrics and types evaluation; layout and Implementation of Bioelectronic imaginative and prescient platforms.
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Additional info for BIOELECTRONIC VISION: Retina Models, Evaluation Metrics and System Design (Series on Bioengineering & Biomedical Engineering)
1). This electrical signal travels along the axon to the axonal terminals and is refreshed along the way to prevent signal decay. This transmission and signal refreshing involves the movement of charged particles – namely ions – across the neuron membrane, and terminates with the release of a chemical substance into the synapse. The synaptically transmitted messages can be either excitatory or inhibitory. There are several types of ions involved in the transmission of the action potential along a neuron’s axon.
The Eye From a functional point of view, the eye is an optical system that gathers light and focuses it on its rear surface where the retina lies. Fig. 4 shows a schematic representation of the horizontal cross section of the human eye with the different parts labeled. Looking into someone’s eyes, it is possible to immediately identify several components. One is the pupil, an aperture in the center of the eye that appears dark due to the light absorbing pigments of the retina on the back. Around the pupil is the iris, a colored muscle that confers the color to the eyes, but whose color does not have any functional relevance.
Glia also have important developmental roles, such as guiding migration of neurons in early development and producing molecules that modify the growth of axons and dendrites [Purves et al. (2007)]. 2 Neuron Dynamics When the integration of the signals gathered by the dendrites and delivered to the cell body surpasses a given threshold, an action potential is generated. An action potential is an electric pulse that is generated at the axon hillock, where the axon emerges from the cell body (see Fig.