Download A Biologically Inspired CMOS Image Sensor by Mukul Sarkar PDF

By Mukul Sarkar

Biological platforms are a resource of concept within the improvement of small independent sensor nodes. the 2 significant different types of optical imaginative and prescient structures present in nature are the only 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 procedure of bugs permits them to fly with a constrained intelligence and mind processing energy. A CMOS photo sensor replicating the conception of imaginative and prescient in bugs is mentioned and designed during this booklet for business (machine imaginative and prescient) and clinical purposes.

The CMOS steel layer is used to create an embedded micro-polarizer capable of feel polarization info. This polarization details is proven to be precious in purposes like actual time fabric type and self sufficient agent navigation. additional the sensor is supplied with in pixel analog and electronic stories which enable version of the dynamic variety and in-pixel binarization in actual time. The binary output of the pixel attempts to duplicate the flickering influence of the insect’s eye to become aware of smallest attainable movement according to the swap in nation. An built in counter counts the alterations in states for every row to estimate the path of the movement. The chip contains 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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Extra info for A Biologically Inspired CMOS Image Sensor

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The MTF is mathematically related to point spread function (PSF) of the optical system. 13) The finest resolvable sinusoidal pattern is defined by the optical cut-off MTF of the lens of a single ommatidium. The resolution of the compound eyes are very low because of the small diameter of the ommatidium. Field of View (FOV) Each optical channel in the natural compound focuses the light coming from the object points lying on the channels optical axis. Due to this bending, each ommatidium points towards a different angular direction.

However, as the true position is not well constrained and it is necessary to fix it somewhere, the center of the image turns out to be a good approximation [31]. The center of the sub-image needs to be calibrated with high accuracy for two reasons: a) Each micro-lens has a relatively small field of view with a dimension of around 25x25 pixels in the designed electro-optical system. Thus if the image center calculation varies by approximately five pixels, an error of 20% is introduced in the image reconstruction, which is quite high.

It was not possible to test the micro-lens array with the photodetector array, due to the delay in fabrication of micro-lens array, thus the distortions could not be quantified. The image distortion correction algorithms that can be used to correct the distorted image are described in detail in the following sub-section. 42 2 Natural and Artificial Compound Eye Spots on the optimized angles of incidence Fig. 20 Channel seven: Light spots on the detector. There is an angular resolution of 1°. 2 Fig.

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