Sökning: "JPEG"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet JPEG.

  1. 1. Completing the Picture : Fragments and Back Again

    Författare :Martin Karresand; Nahid Shahmehri; Katrin Y. Franke; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer security; computer forensics; digital forensics; file carving; data recovery; fragment reassembly; file type categorisation; Computer science; Datalogi;

    Sammanfattning : Better methods and tools are needed in the fight against child pornography. This thesis presents a method for file type categorisation of unknown data fragments, a method for reassembly of JPEG fragments, and the requirements put on an artificial JPEG header for viewing reassembled images. LÄS MER

  3. 2. Very low bitrate facial video coding : based on principal component analysis

    Författare :Ulrik Söderström; Haibo Li; Umeå universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Image processing; Video processing; Very low bitrate coding; Other electrical engineering; electronics and photonics; Övrig elektroteknik; elektronik och fotonik;

    Sammanfattning : This thesis introduces a coding scheme for very low bitrate video coding through the aid of principal component analysis. Principal information of the facial mimic for a person can be extracted and stored in an Eigenspace. Entire video frames of this persons face can then be compressed with the Eigenspace to only a few projection coefficients. LÄS MER

  4. 3. Model-based head tracking and coding

    Författare :Jacob Ström; Stan Sclaroff; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : This thesis treats two topics in model-based coding; coding of facial textures (Part 1) and real-time head tracking (Part 2).In Part 1, it is shown that a face image can be efficiently coded using a parameterization based on geometrical normalization followed by Karhunen-Loeve transformation (KLT). LÄS MER

  5. 4. Maintenance Consideration for Long Life Cycle Embedded System

    Författare :Xiaozhou Meng; Benny Thörnberg; Mattias O'Nils; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning :      In this thesis, the work presented is in relation to consideration to the maintenance of a long life cycle embedded system. Various issues can present problems for maintaining a long life cycle embedded system, such as component obsolescence and IP (intellectual property) portability. LÄS MER

  7. 5. Technology Driven Obsolescence Management for Embedded Systems

    Författare :Xiaozhou Meng; Benny Thörnberg; Mattias O'Nils; Jim Tørresen; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Long life cycle; embedded system; DMSMS; obsolescnece; FPGA; IP; portability;

    Sammanfattning : In this thesis, the work presented is in relation to technology driven obsolescence management for embedded systems.Component obsolescence problems may occur in systems with a life cycle longer than that of one or more of their components when there is a demand without enough existing stock, such as automotive, avionics, military applications, etc. LÄS MER