Browsing by Author "Sankowski, Dominik Jan"

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Access status: Open Access ,
Implementacja w układach FPGA kodeka obrazów w standardzie MPEG-2 spełniającego wymogi czasu rzeczywistego
(Data obrony: 2007-10-02) Dąbrowska, Agnieszka
Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
The basic algorithms of video compression and decompression, which are components of encoder and de-coder of MPEG-2 standard, are described in doctoral the-sis. Moreover it contains the description of functionality as well as parameters of ISO/IEC 13818-2 standard. It contains the short description of previous examples of realization of MPEG-2 standard. The doctoral thesis contains the description of discrete cosine transform algorithms. Moreover it presents different aspects of hardware implementation of DCT blocks and received parameters. Proposed by author possible modifications of existing algorithms are described. These modifications have the adaptation of these algorithms to hardware implementation in programmable devices FPGA in view. It contains detailed description of quantisation and dequantisation operation in MPEG-2 standard taking control parameters of these operations under consideration. Moreover it presents possible ways of implementation of these operations. The basic algorithms of motion estimation are described. Implementations of two chosen algorithms of motion estimation as well as Three-Step Search algorithm modification are presented additionally. The algorithms of lossless video compression applied in encoders and decoders of standard MPEG2 as well as parameters of entropy encoder and decoder implementation in FPGA devices are presented. The descriptions and parameters of following versions of MPEG-2 standard encoders and codecs implemented in FPGA devices are also contained.
Access status: Open Access ,
Implementacja zaawansowanych algorytmów przetwarzania, analizy i szyfrowania obrazów w układach reprogramowalnych
(Data obrony: 2013-03-08) Kryjak, Tomasz
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
The thesis presents a range of advanced hardware modules to realize image processing, analysis and encryption implemented in reprogrammable FPGA device. Encryption with the block cipher Clefia and colour image filtering with the PGF (Peer Group Filtering) algorithm were proposed. In both cases, it was the first implementation of the method in FPGA. Local thresholding described in a high level synthesis language Mitron-C was also presented. In the following part of the thesis, research results on background generation and moving object detection were described. As the basis the multivariant clustering algorithm was used. Several improvements were introduced among others: the use of the CIE Lab colour space and an additional segmentation using textural information. Finally, three modules useful in automated video surveillance systems, which are based on background generation, were implemented. These includes intrusion into protected zone detection, camera tampering detection and head and shoulders detection using LBP descriptor and SVM. All proposed modules allow processing of the video stream with a resolution of at least 640 x 480 and a frequency of 60 frames per second in real time. The research results were published in several scientific journals and conference proceedings.