The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform

Leonel Sousa - One of the best experts on this subject based on the ideXlab platform.

  • Fast transcoding architectures for insertion of non-regular shaped objects in the compressed DCT-domain
    Signal Processing: Image Communication, 2003
    Co-Authors: Nuno Roma, Leonel Sousa
    Abstract:

    This paper addresses the problem concerned with the insertion of non-regular shaped objects, such as logos or subtitles, in compressed video signals. To achieve this objective, a different approach from the usual pixel-domain Compositing Operation is adopted, in order to avoid the presence of undesired semi-transparent rectangular regions around the inserted objects. The transposition of this technique to the compressed DCT-domain is presented, as well as the integration of the logo insertion module in several architectures of compressed domain video transcoders. A detailed study of the main characteristics of the proposed DCT-domain transcoders, with a special emphasis on the required computational load and on the obtained coding quality (PSNR) of the processed video sequences shows that DCT-domain insertion architectures can offer significant advantages, both in terms of subjective quality and computational cost. Moreover, the distinctive features presented by the proposed architectures provide the means to adapt the insertion scheme to the particular requirements of the target application.

  • Insertion of irregular-shaped logos in the compressed DCT domain
    2002
    Co-Authors: Nuno Roma, Leonel Sousa, Técnico Inesc-id
    Abstract:

    Abstract: This paper addresses the problem of the insertion of irregular-shaped objects, such as logos or subtitles, in video signals in the compressed DCT domain. To achieve this objective, a different approach from the usual pixel domain Compositing Operation is adopted, in order to avoid the presence of undesired semi-transparent regions around the inserted objects. The transposition of this technique to the frequency domain is presented, as well as the inclusion of a logo insertion module in the architecture of a compressed domain video transcoder. 1

  • DSP - Insertion of irregular-shaped logos in the compressed DCT domain
    2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628), 1
    Co-Authors: Nuno Roma, Leonel Sousa
    Abstract:

    This paper addresses the problem of the insertion of irregular-shaped objects, such as logos or subtitles, in video signals in the compressed DCT domain. To achieve this objective, a different approach from the usual pixel domain Compositing Operation is adopted, in order to avoid the presence of undesired semi-transparent regions around the inserted objects. The transposition of this technique to the frequency domain is presented, as well as the inclusion of a logo insertion module in the architecture of a compressed domain video transcoder.

Nuno Roma - One of the best experts on this subject based on the ideXlab platform.

  • Fast transcoding architectures for insertion of non-regular shaped objects in the compressed DCT-domain
    Signal Processing: Image Communication, 2003
    Co-Authors: Nuno Roma, Leonel Sousa
    Abstract:

    This paper addresses the problem concerned with the insertion of non-regular shaped objects, such as logos or subtitles, in compressed video signals. To achieve this objective, a different approach from the usual pixel-domain Compositing Operation is adopted, in order to avoid the presence of undesired semi-transparent rectangular regions around the inserted objects. The transposition of this technique to the compressed DCT-domain is presented, as well as the integration of the logo insertion module in several architectures of compressed domain video transcoders. A detailed study of the main characteristics of the proposed DCT-domain transcoders, with a special emphasis on the required computational load and on the obtained coding quality (PSNR) of the processed video sequences shows that DCT-domain insertion architectures can offer significant advantages, both in terms of subjective quality and computational cost. Moreover, the distinctive features presented by the proposed architectures provide the means to adapt the insertion scheme to the particular requirements of the target application.

  • Insertion of irregular-shaped logos in the compressed DCT domain
    2002
    Co-Authors: Nuno Roma, Leonel Sousa, Técnico Inesc-id
    Abstract:

    Abstract: This paper addresses the problem of the insertion of irregular-shaped objects, such as logos or subtitles, in video signals in the compressed DCT domain. To achieve this objective, a different approach from the usual pixel domain Compositing Operation is adopted, in order to avoid the presence of undesired semi-transparent regions around the inserted objects. The transposition of this technique to the frequency domain is presented, as well as the inclusion of a logo insertion module in the architecture of a compressed domain video transcoder. 1

  • DSP - Insertion of irregular-shaped logos in the compressed DCT domain
    2002 14th International Conference on Digital Signal Processing Proceedings. DSP 2002 (Cat. No.02TH8628), 1
    Co-Authors: Nuno Roma, Leonel Sousa
    Abstract:

    This paper addresses the problem of the insertion of irregular-shaped objects, such as logos or subtitles, in video signals in the compressed DCT domain. To achieve this objective, a different approach from the usual pixel domain Compositing Operation is adopted, in order to avoid the presence of undesired semi-transparent regions around the inserted objects. The transposition of this technique to the frequency domain is presented, as well as the inclusion of a logo insertion module in the architecture of a compressed domain video transcoder.

David Bainbridge - One of the best experts on this subject based on the ideXlab platform.

  • JCDL - Big brother is watching you: now in a doubleplusgood way
    2017 ACM IEEE Joint Conference on Digital Libraries (JCDL), 2017
    Co-Authors: Corey Sterling, Carlin St. Pierre, David Bainbridge
    Abstract:

    This paper reports on the progress made with our X Marks The Spot (XMTS) system. In XMTS we make a fundamental change to the Compositing Operation in a desktop manager, storing all text-display events and their related raster-draw events. This means we can provide the user with a search interface that allows them to go back in time and view how their desktop used to look. Because XMTS is aware of what text was drawn into which window and at what position, the provided snapshot is semi-interactive in that the user can bring individual windows forwards and backwards, and copy text from them. In previous work we demonstrated the approach is technically feasible. In this paper we detail infrastructural advances we have made and showcase its new search interface.

Sun Jun - One of the best experts on this subject based on the ideXlab platform.

  • A Novel Caption Insertion Method Based on DCT Domain
    Computer Engineering, 2004
    Co-Authors: Sun Jun
    Abstract:

    This paper applies a novel compressed domain approach to insert caption in MPEG video stream. This approach reduces a lot of computing complexity and storage memory comparing to conventional method of decompression-addition-recompression. In order to avoid the presence of undesired semi-transparent region around the caption, a different approach from the usual pixel domain Compositing Operation is adopted.

Corey Sterling - One of the best experts on this subject based on the ideXlab platform.

  • JCDL - Big brother is watching you: now in a doubleplusgood way
    2017 ACM IEEE Joint Conference on Digital Libraries (JCDL), 2017
    Co-Authors: Corey Sterling, Carlin St. Pierre, David Bainbridge
    Abstract:

    This paper reports on the progress made with our X Marks The Spot (XMTS) system. In XMTS we make a fundamental change to the Compositing Operation in a desktop manager, storing all text-display events and their related raster-draw events. This means we can provide the user with a search interface that allows them to go back in time and view how their desktop used to look. Because XMTS is aware of what text was drawn into which window and at what position, the provided snapshot is semi-interactive in that the user can bring individual windows forwards and backwards, and copy text from them. In previous work we demonstrated the approach is technically feasible. In this paper we detail infrastructural advances we have made and showcase its new search interface.