Download PDF by Mukul Sarkar, Albert Theuwissen: A Biologically Inspired CMOS Image Sensor

By Mukul Sarkar, Albert Theuwissen

ISBN-10: 3642349005

ISBN-13: 9783642349003

-Latest learn on Polarization imaginative and prescient Detection utilizing a CMOS picture Sensor
-Presents an instance of a Biologically encouraged CMOS photo Sensor
-Written by means of best specialists within the field

Biological platforms are a resource of proposal within the improvement of small self sufficient sensor nodes. the 2 significant forms of optical imaginative and prescient platforms present in nature are the one aperture human eye and the compound eye of bugs. The latter are one of the such a lot compact and smallest imaginative and prescient sensors. the attention is a compound of person lenses with their very own photoreceptor arrays. The visible method of bugs permits them to fly with a constrained intelligence and mind processing energy. A CMOS picture sensor replicating the conception of imaginative and prescient in bugs is mentioned and designed during this booklet for commercial (machine imaginative and prescient) and clinical applications.

The CMOS steel layer is used to create an embedded micro-polarizer capable of experience polarization info. This polarization info is proven to be precious in functions like actual time fabric class and independent agent navigation. extra the sensor is provided with in pixel analog and electronic thoughts which enable edition of the dynamic variety and in-pixel binarization in actual time. The binary output of the pixel attempts to copy the flickering influence of the insect’s eye to become aware of smallest attainable movement in response to the swap in nation. An built in counter counts the adjustments in states for every row to estimate the path of the movement. The chip includes an array of 128x128 pixels, it occupies a space of five x four mm2 and it's been designed and fabricated in an 180nm CMOS CIS technique from UMC.

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The resolution of a planar artificial compound eye depends on the pitch difference between the micro-lens array and the pinhole array [8]. 16) where Δp is the pitch difference. The acceptance angle, which determines the smallest resolvable object period, is given by the PSF of the micro-lens and the transmission profile of the pinhole array. 18) Δϕ The FOV for a given acceptance angle is desired to be large to be able to obtain large number of image pixels. 14, and must be matched to the digital sensor array size.

Furthermore the energy decreases towards the outer region of the sub-FOVs due to vignetting. In ideal case the spots in each optical channel should be easily distinguishable, however due to the distortion of the optical channel nonlinearities are introduced deforming the shape of the optical channels. Fig. 22 Obtained distorted sub-image from the nine optical channels for the designed lens array Nonlinearities of an optical system can be largely described by two types of distortion: lens geometric distortion and photometric distortion.

CMOS image sensors does not need a specialized fabrication unit and could be made with conventional semiconductor process. 2 Photodetector 51 With CMOS, a photodiode is typically used to generate charges, which are immediately converted into a voltage at the pixel. The supporting circuitry can thus be located alongside each photodiode or in the same chip, making the fabrication process cheaper compared to the CCDs. This reduces cost of supporting circuitry required, camera complexity, and also power consumption.

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A Biologically Inspired CMOS Image Sensor by Mukul Sarkar, Albert Theuwissen

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