Prevas AB, a consulting company focused on industrial systems and  embedded systems, are looking to expand their mobile phone competency  and started two projects for this purpose. The rst is a diploma work to create a proof-of-concept barcode reader running on Symbian mobile phones, and the second is a student project for the new Innovative Programming bachelors degree to create a functioning price comparison application using IMS1 around the proof-of-concept created earlier. Both projects achieved their stated goals. However, due to none of the projects focusing on eciency or theoretical correctness the resulting application is dicult to start, runs slowly, leaks memory and is codewise bloated. These defects prevent the application from being realistically deployable, and a third project is started to clean up the application and improve it. This report describes the solutions employed in that third project The barcode reader in the application was split into two parts: First is the actual application written in C++ responsible for capturing images, sending them to the decoding server and displaying the result to the user. Second is  the decoding server, a separate application written in java that using a TCP-socket waits for images, decodes them, and returns the result. The primary goal of this project is to not only improve, but actually integrate the decoder into the C++ application, massively improving speed and memory usage. This report was written to highlight the lessons learned during this project, to describe the algorithms and methods used to improve the decoder and to be of use to anyone else writing time-constrained and heavily optimized barcode or pattern recognition code for Symbian devices.

The aim of this diploma thesis was to created application for detection and decoding QR codes using devices with the Android Operating System. For preprocessing of the visual field camera is used OpenCV library. Designed preprocessing string searches a perspective transforms possible QR codes. This is suppressed a shape distortion QR code that would otherwise reduce the successful decoding. At the same time the preprocessing string applied unsharp mask, which reduces the effect of motion blur image caused by the camera motion. Thus preprocessing scene is finally decoded using ZXing library. Described manner it is possible to achieve a higher success rate detection and decoding of QR codes than other conventional QR readers.

The thesis deals with the problems of user authentication. The first chapter analyzes the problem of authentication, its methods and its utilization. The second chapter presents the different security options for communication. The chapter describes security, communication and authentication protocols. There is the 2D barcode QR Code described at the end of the chapter. The third chapter is devoted to ASP.NET technology, its development and possibilities of utilization. Attention is focused on web form and server controls. There is an analysis of elements of cookies and possibilities of their use. The last chapter consists of a practical part, which describes the development of a web application. There is a description of the parts of application, such as the database, the Web navigation, master pages and etc. in the following chapter. The cardinal part of the chapter consists of an analysis and implementation of forms authentication, the attribute authentication and authentication with QR code. Finally, there is a description of way how to secure the communication by using a certificate.