Design and low-power implementation of an adaptive image rejection receiver

This paper deals with and details the design and implementation of a low-power; hardware-efficient adaptive self-calibrating image rejection receiver based on blind-source-separation that alleviates the RF analog front-end impairments. Hybrid strength-reduced and re-scheduled data-flow, low-power implementation of the adaptive self-calibration algorithm is developed and its efficiency is demonstrated through simulation case studies. A behavioral and structural model is developed in Matlab as well as a low-level architectural design in VHDL providing valuable test benches for the performance measures undertaken on the detailed algorithms and structures.

Aphomoioo : existir entre o processo e a obra

Coming from the need to express an image – aphomoioo – is more than a dissertation trying to prove its argument. It is the result of an experimentation born from within an anguish felt through an image. An uncontrollable desire that transforms my need into an answer to my craft. Through a discursive organization of speech enmeshed by psychoanalytic, biological, philosophical and linguistic concepts, we are allowed to discover that existing is more than agreeing on a target with an end but, as the relationship that it is, it does not define us as beings, but as an active/interactive limit. And this identity which puts us face to face with the reality - constructed and constructive - seeking to describe the similarity of the existence of things, the images. These beings from the reality that sends us to the symbolic place of our existence, the mundanity. A restlessness that is embedded into every action of knowing that, through language, establishes as true everything which silences the symbolic through a rule of conduct - the principle of reason - a formal rule of all knowledge that establishes the contemplative way for all knowledge originally set up as one signification event. The nature of our organization as living beings, our structural coupling, is what enables us to conclude that all formalities established as knowledge are born into a delirium that is expressed in the conformity of an answer. That being the end of an aphomoioo. The purpose of a "doing" that expresses itself into an image that is projected into a representation. A "doing" made after an image through an ergo genesis – the "artwork" – an answer to my making that expresses the image of my separation from myself as an image of ego established in a represented projection of my hallucinatory image

Design of a power-aware digital image rejection receiver

This paper deals with and details the design of a power-aware adaptive digital image rejection receiver based on blind-source-separation that alleviates the RF analog front-end impairments. Power-aware system design at the RTL level without having to redesign arithmetic circuits is used to reduce the power consumption in nomadic devices. Power-aware multipliers with configurable precision are used to trade-off the image-rejection-ratio (IRR) performance with power consumption. Results of the simulation case studies demonstrate that the IRR performance of the power-aware system is comparable to that of the normal implementation albeit degraded slightly, but well within the acceptable limits.

Identification of image attributes that are most affected with changes in displayed image size

This paper describes an investigation of changes in image appearance when images are viewed at different image sizes on a high-end LCD device. Two digital image capturing devices of different overall image quality were used for recording identical natural scenes with a variety of pictorial contents. From each capturing device, a total of sixty four captured scenes, including architecture, nature, portraits, still and moving objects and artworks under various illumination conditions and recorded noise level were selected. The test set included some images where camera shake was purposefully introduced. An achromatic version of the image set that contained only lightness information was obtained by processing the captured images in CIELAB space. Rank order experiments were carried out to determine which image attribute(s) were most affected when the displayed image size was altered. These evaluations were carried out for both chromatic and achromatic versions of the stimuli. For the achromatic stimuli, attributes such as contrast, brightness, sharpness and noisiness were rank-ordered by the observers in terms of the degree of change. The same attributes, as well as hue and colourfulness, were investigated for the chromatic versions of the stimuli. Results showed that sharpness and contrast were the two most affected attributes with changes in displayed image size. The ranking of the remaining attributes varied with image content and illumination conditions. Further, experiments were carried out to link original scene content to the attributes that changed mostly with changes in image size.

Applications of Statistical Modeling in Iterative CT Image Reconstruction

Thesis (Master's)--University of Washington, 2015