Search results for "Hand"
showing 10 items of 1364 documents
Wavelet-based video compression: A glimpse of the future?
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad Even though wavelet-based video compression has been an area of research for more than a decade, motion estimation and compensation has been considered complex and inefficient until recently. We have carried out a thorough investigation of existing research work in this field, and found that fundamental problem with wavelet-based temporal removal while obtaining highly scalability (the wavelet-properties of multiresolution structure in combination with embedded coding), has been solved by performing motion compensated temporal filtering within the wavelet domain of a overcomplete three-dimensional li…
An improved image processing chain for mobile terminals
2002
Masteroppgave i informasjons- og kommunikasjonsteknologi 2002 - Høgskolen i Agder, Grimstad Based on the proposal in the report by Tryggve Mikkelsen [Mikkelsen, 2001] this thesis investigates and discusses the implementation of a simplified image processing chain for modern mobile terminals. Previous work on image processing in this field of application has shown that the demosaicing operation, color space conversion and downsampling are resource demanding pre-processing operations. The simplification potential of the signal chain lies within the pictured scenario of using Bayer RGB from the image sensor directly as input to the compression scheme. By omitting these pre-processing operation…
Analysis of audio coding algorithms for networked embedded systems
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad Today there are many different audio coding algorithms, some of them standardized by the ITU, like G.711, G.726 and G.728, and several other codecs by other organizations like Fraunhofer (mp3) and Microsoft (WMA). All these algorithms differ in several important features, like speech quality, bit or compression rate, robustness, delay, sampling frequency, complexity and range of use. The past decade we have witnessed a great progress towards application of low-rate speech/music coders as well as computer related voice/music applications. Central to this progress has been the development of speech cod…
Expanding Convolutional Tsetlin Machine for Images with Lossless Binarization
2020
Master's thesis in Information- and communication technology (IKT590) Deep convolutional neural networks (CNN) is known to be efficient in image classification but non-interpretable. To overcome the black box nature of CNN a derivative of the Tsetlin automata, the convolutional Tsetlin machine (CTM) which is transparent and interpretable, was developed. As CTM handles binary inputs, it is important to transform the input images into binary form with minimum information loss so that the CTM can classify them correctly and efficiently. Currently, a relatively lossy mechanism, called adaptive Gaussian thresholding, was employed for binarization. To retain as much information as possible, in th…
Incremental web crawling as a competitive game of learning automata
2005
Masteroppgave i informasjons- og kommunikasjonsteknologi 2005 - Høgskolen i Agder, Grimstad There is no doubt that the World Wide Web has lived up to it’s hype of being the world’s central information highway through the past years. An increasing amount of versatile services keeps finding their way onto the Web as information providers continue to embrace the possibilities that the Web can offer. Especially the possibility of producing dynamic content has been an accelerant factor and is the reason why we now conveniently can participate in online auctions or see the latest development of our favorite stocks in near real-time from our own living rooms. However, for automated data mining app…
Camera functionality in modern mobile terminals : software FIR filter for demosaicing with RISC
2001
Masteroppgave i informasjons- og kommunikasjonsteknologi 2001 - Høgskolen i Agder, Grimstad This thesis discusses implementation and optimizing of the image pre-processing operation demosaicing on a typical hardware architecture for mobile terminals. Work has shown that the demosaicing operation is equivalent to the mathematical operation of interpolation, and that optimizing potential lies within the implementation of the anti-imaging filter for the interpolator. This filter can be realized as an FIR filter with the filter coefficients obtained from a suitable interpolation function (kernel). Through literature review, nearest neighbor replication, bilinear and cubic convolution kernels we…
Studie av ulike Mother Wavelets til bruk innen kantdeteksjon av blodårer i ultralydbilder
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad Kantdeteksjon er en viktig forutsetning for at operasjoner skal kunne gjennomføres på en tryggest mulig måte. Kirurgene må vite hvor blodårene er for å unngå og gjøre skade på pasienten. Metodene som blir brukt til kantdeteksjon i dag er i mange tilfeller ikke gode nok. Arbeidet med å forbedre og automatisere metodene for kantdeteksjon i medisinske bilder er en kontinuerlig prosess. Vi har bygget en java-applikasjon som bruker wavelets for å prøve og finne kanter i ultralydbilder og syntetiske bilder. Applikasjonen har vi brukt til å teste ulike Mother Wavelets. Testingen ble gjort for å finne ut hvi…
Gjenfinning av tidlige forkalkninger i mammografibilder ved hjelp av wavelets
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad Mikroforkalkninger i brystvev kan være det første tegn på brystkreft. Det er derfor svært viktig å kunne finne disse på et tidlig tidspunkt. I dag blir mammografibilder undersøkt visuelt av medisinsk personale. Dette er en tidkrevende og usikker metode. Digital bildebehandling er på vei inn i medisinsk teknikk, og kan forenkle analyseprosessen. En mye brukt metode for bildeanalyse frem til i dag er Fourieranalyse. Denne analysemetoden har den svakhet at det ikke er mulig å finne posisjonen til eventuelle mikroforkalkninger, bare om de er til stede eller ikke. I dette arbeidet er det undersøkt om det …
A study of Wavelets for edge detection of anatomical structure on medical images
2004
Masteroppgave i informasjons- og kommunikasjonsteknologi 2004 - Høgskolen i Agder, Grimstad Osteoporosis is a bone disease that makes your bone crumble away. To find out how thick your bone structure is, medical personnel uses x-ray images and measure the thickness of your bones. Today this is done manually by the use of a ruler. In this thesis we have examined the use of Wavelets for edge detection in order to find a better and smarter way of measuring the bone thickness digitally. Wavelets are a relatively new mathematical method that allows you to split up and examine a signal. Three different Mother Wavelets; Haar, Mexican Hat and Morlet were examined to find the one that was best suite…
A study of wavelets combined, if desired, with other methods for use in edge sharpening of ultrasound images
2003
Masteroppgave i informasjons- og kommunikasjonsteknologi 2003 - Høgskolen i Agder, Grimstad The increased use of laparoscopic surgery has resulted in a growing interest in use of ultrasounds. Ultrasounds do not have any known side effects, and it provides the surgeon with real-time imaging. In spite of its advantages, ultrasounds also have some disadvantages. The most obvious is that ultrasound images contain much noise. Another problem is that edges of vital organs may appear diffuse. In this thesis we will look at ways of sharpening edges by using a relatively new mathematical method called wavelet. With wavelets we analyse signals according to scale. This idea started with Fourier in the…