Local Binary Patterns in Focal-Plane Processing. Analysis and Applications

Feature extraction is the part of pattern recognition, where the sensor data is transformed into a more suitable form for the machine to interpret. The purpose of this step is also to reduce the amount of information passed to the next stages of the system, and to preserve the essential information in the view of discriminating the data into different classes. For instance, in the case of image analysis the actual image intensities are vulnerable to various environmental effects, such as lighting changes and the feature extraction can be used as means for detecting features, which are invariant to certain types of illumination changes. Finally, classification tries to make decisions based on the previously transformed data. The main focus of this thesis is on developing new methods for the embedded feature extraction based on local non-parametric image descriptors. Also, feature analysis is carried out for the selected image features. Low-level Local Binary Pattern (LBP) based features are in a main role in the analysis. In the embedded domain, the pattern recognition system must usually meet strict performance constraints, such as high speed, compact size and low power consumption. The characteristics of the final system can be seen as a trade-off between these metrics, which is largely affected by the decisions made during the implementation phase. The implementation alternatives of the LBP based feature extraction are explored in the embedded domain in the context of focal-plane vision processors. In particular, the thesis demonstrates the LBP extraction with MIPA4k massively parallel focal-plane processor IC. Also higher level processing is incorporated to this framework, by means of a framework for implementing a single chip face recognition system. Furthermore, a new method for determining optical flow based on LBPs, designed in particular to the embedded domain is presented. Inspired by some of the principles observed through the feature analysis of the Local Binary Patterns, an extension to the well known non-parametric rank transform is proposed, and its performance is evaluated in face recognition experiments with a standard dataset. Finally, an a priori model where the LBPs are seen as combinations of n-tuples is also presented

The effect of focal point parameters in fiber laser welding of structural steel

In this thesis the effect of focal point parameters in fiber laser welding of structural steel is studied. The goal is to establish relations between laser power, focal point diameter and focal point position with the resulting quality, weld-bead geometry and hardness of the welds. In the laboratory experiments, AB AH36 shipbuilding steel was welded in an I-butt joint configuration using IPG YLS-10000 continuous wave fiber laser. The quality of the welds produced were evaluated based on standard SFS-EN ISO 13919-1. The weld-bead geometry was defined from the weld cross-sections and Vickers hardness test was used to measure hardness's from the middle of the cross-sections. It was shown that all the studied focal point parameters have an effect on the quality, weld-bead geometry and hardness of the welds produced.

Lastenkulttuuripoliittisesta ohjelmasta tilanvuokraustoimintaan : lastenkulttuuritarjonnan muodostuminen Helsingin alueellisissa kulttuurikeskuksissa

Then aim of this thesis is to investigate children's culture in the regional cultural centres of Helsinki, namely Stoa, Malmitalo and Kanneltalo. The main objective was to identify how the center's repertoire for children forms. Moreover, a further research question was how different fields of art as well as proposals for action defined by the Children's Culture Programme, are portrayed in the repertoire of the regional cultural centres. The Ministry of Education's missions are to plan cultural and artistic policies, to support the industry financially, and to prepare cultural legislation. The Ministry promotes children's culture with a variety of programs and projects. The basis of the thesis is formed by the Finnish Ministry of Education's Children's Culture Programme, published in 2003. The goal of the programme is to give direction to the promotion of children's culture from 2003 to 2007. The programme presented proposals for action in different fields of art that are directed towards a broad range of implementors. In addition, in the theoretical section the focus is on the research of the Ministry of Education, the Art Council of Finland and the Municipalities. The research investigates the roles in children's culture as well as the activities of regional cultural centers. The qualitative analysis has been conducted by interviewing the employees of these regional cultural centers. The factors that affect and hinder the composition of the children's programme's repertoire are analysed based on the results of the interviews. The factors that affect the composition are the supply, the facilities and the possibilities provided by cooperation. The results section examines how the Children's Cultural Programme presents different fields of art. What is also taken into account is focal points connected to them, the proposals for action when building the repertoire. The results of the interviews indicate that the repertoire of the regional cultural centres is very diverse and it often meets the propositions of the children's cultural programme. However, the contents of the program were unknown for many. Various fields of art have been catered for in the children's repertoire and the supply is of good quality. The City of Helsinki Cultural Office's upcoming change in the administration was also mentioned, as the interviewees contemplated its future effects.