| In recent years, digital video technology combined with TV technology, computer technology and communications technology has been made great advances in the information science domain, and used widely, consequently, it has entered our daily lives. With rapid advancements of digital video, however, there is lots of digital video systems having different spatio-temporal sampling ratio, having different standards and different formats, having different display equipment, in order to carry out different formats conversion. Therefore, it is essential for me to do deeper research.In this paper, the following contents are mainly illustrated in details:1. According as time-varying images composing model, simulated 3-D rigid shift motion and rotation motion in computer, implemented perspective projection and orthographic projection arithmetic, it proved that the result of experiment is accurate.2. Analyzed the signal of 3-d spatio-temporal sampling in spatio-temporal domain and frequency domain, according as the base principle of sampling, adopted more-dots-marked method, gained random spatio-temporal sampling matrix of digital video signal, it proved that arithmetic is accurate and efficiency.3. According as the base principle of digital video motion parameter estimating, placed emphasis on discussing the block-matching method in motion estimation, gave a intact N- search method, simulated in computer according to the S-VGA standard of digital video, and got a accurate motion vectors.4. Researched four technology of structure conversion about digital video, de-interlaced, frame ratio down or up, row ration down or up, the width and high transforming, implemented lots of corresponding arithmetic of four techniques, motion compensate structure conversion method based on the motion estimating improved the image sequence definition and liquidity degree.5. Researched the external quality assessment method of digital video, gave different indexes of the image sequence definition and liquidity degree about digital video structure conversion, there is consistent between the result of experiment and subjective assessment.6. The idea of the systemic design about digital video structure conversion is establishing correctly, devise the applied program structure, and complied Matlab program based on Windows, do a lot of experiment about structure conversions, the result of experiment is comparatively satisfactory. |
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