Repositório Digital

A- A A+

Objective video quality assessment considering frame and display time variation

.

Objective video quality assessment considering frame and display time variation

Mostrar registro completo

Estatísticas

Título Objective video quality assessment considering frame and display time variation
Autor Valdez, Franco Almada
Orientador Bampi, Sergio
Co-orientador Guerra, Raphael
Data 2012
Nível Graduação
Instituição Universidade Federal do Rio Grande do Sul. Instituto de Informática. Curso de Ciência da Computação: Ênfase em Ciência da Computação: Bacharelado.
Assunto Televisão digital
Vídeo digital
[en] Digital television
[en] Video processing
[en] Video quality metrics
Abstract Video quality assessment is becoming more important in current digital video application. Most of the video encoders and decoders focus in providing more visual quality in less amount of digital information, being the compression one of the most important solutions for making possible the transmission of high quality videos in the current digital transmission media. Sometimes, however, not only video compression is good enough for video quality transmission, maybe the available network bandwidth or the ability to process the video by a low-end processor is not sufficient for continuous playback. Many techniques that consider time variabilities of different sorts need to be developed to keep a digital video watchable. This work focus on a new timeline approach to compare the quality of videos for which a presentation time stamp variability is allowed. Based on video quality metrics already established the new approach can be used to help the decision about the most suitable method for real-time video transmission. Among the many possible techniques able to cope with time stamp variability, one can mention the variable delay time in video presentation, or the use of frame skipping technique, or even more compression applied to reduce the bandwidth and/or processing - improving the perceived video quality under scarce resource availability. A new timeline approach to calculate the current video quality metrics used in most of the encoders and decoders available was developed. This timeline approach takes into account not only the frames themselves, as a frame-by-frame evaluation, but both the frame and presentation time stamp are considered in the proposed approach to the problem. The quality comparison is based on a new discretization, which hopefully serves better the quality of digital video without losing perceptual quality in the process. All the work is tested in an offline solution program that is able to give numeric quality index to the tested sample videos. Those samples are selected from the current distribution of the German digital video television system, encoded in MPEG-2.
Tipo Trabalho de conclusão de graduação
URI http://hdl.handle.net/10183/54135
Arquivos Descrição Formato
000855632.pdf (6.286Mb) Texto completo Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.