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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Error Detection for DMB Video Streams

Irani, Ramin January 2013 (has links)
The purpose of this thesis is to detect errors in Digital Multimedia Broadcasting (DMB) transport stream. DMB uses the MPEG-4 standard for encapsulating Packetized Elementary Stream (PES), and uses the MPEG-2 standard for assembling them in the form of transport stream packets. Recently many research works have been carried out about video stream error detection. They mostly do this by focusing on some decoding parameters related to frame. Processing complexity can be a disadvantage for the proposed methods. In this thesis, we investigated syntax error occurrences due to corruption in the header of the video transport stream. The main focus of the study is the video streams that cannot be decoded. The proposed model is implemented by filtering video and audio packets in order to find the errors. The filters investigate some sources that can affect the video stream playback. The output from this method determines the type, location and duration of the errors. The simplicity of the structure is one of advantages of this model. It can be implemented by three simple filters for detecting errors and a “calculation unit” for calculating the duration of an error. Fast processing is another benefit of the proposed model.
2

數位影音加值效果之研究 –以戲劇類型影音為例

蔡雨軒 Unknown Date (has links)
本研究探討數位影音經過加值動作,是否能夠為消費者和內容生產者創造更高的價值。在媒體數位化的時代,隨著VOD、數位電視、影音分享平台的興起,消費者對於影音內容的互動性、對於觀賞影音內容的主導權要求越來越高。目前線上數位影音服務只能提供消費者觀賞影音的時間彈性,以及多部影音的同時選擇,當使用者點選了某影音內容觀賞時,影音的呈現模式與傳統透過電視觀賞的模式相同,消費者是被動接受該部影音節目的編排和觀賞邏輯,無法自行編碼、重組。換言之,目前的線上影音內容並未經過加值。 本研究藉由實地設計一套影音加值方式,透過線上實驗來暸解:一.觀賞者在加值影音與未加值影音的觀賞行為。二.觀賞者對於經過加值後的影音節目的主觀態度。三. 不同年齡、性別、教育程度、職業的消費者間的觀賞行為比較。四. 不同年齡、性別、教育程度、職業的消費者對於經過加值後的影音節目的主觀態度有何差異性,以獲得數位影音加值的效果。 本研究發現: 一. 相較於未經加值的影音,使用者看完加值影音的意願較高。 二. 從使用者觀賞行為追蹤研究發現,加值的影音給予使用者多樣化的觀賞方式 是具有意義的。 三. 使用者對經過加值的影音,在主觀上的態度呈現正面的現象。六成以上使用者很喜歡加值過的影音、七成以上使用者認為加值後的影音在觀賞上很方便的;不喜歡加值影音和認為加值影音不方便者各低於百分之二。

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