Cut & paste
Friedland, Gerald ;  Jantz, Kristian ;  Rojas, Raúl ;  Universität <Berlin, Freie Universität> / Fachbereich Mathematik und Informatik

Main titleCut & paste
Subtitlemerging the video with the whiteboard stream for remote lectures
AuthorFriedland, Gerald
AuthorJantz, Kristian
AuthorRojas, Raúl
InstitutionUniversität <Berlin, Freie Universität> / Fachbereich Mathematik und Informatik
No. of Pages7 S.
Series Freie Universität Berlin, Fachbereich Mathematik und Informatik : Ser. B, Informatik ; [20]05,19
Classification (DDC)004 Data processing and Computer science
AbstractIn the system we use for recording and transmitting lectures over
the Internet, the board content is transmitted as vector graphics,
producing thus a high quality image, while the video of the lecturer
is sent as a separate stream. It is easy for the viewer to read the
board but the lecturer appears in a separate window. To eliminate
this problem, we segment the lecturer from the video stream and
paste his image onto the board image at video stream rates. The
lecturer can be dimmed from opaque to semitransparent, or even
transparent. This paper explains the techniques we apply to achieve
this and argue that it can also compete with state of the art image
segmentation used for foreground extraction in still images. The
approach does not only provide a solution to the divided attention
problem which arises when board and lecturer images are transmitted
in two different streams, it can also be applied to a variety of
other problems where a foreground object must be segmented.
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FU DepartmentDepartment of Mathematics and Computer Science
Other affiliation(s)Institut für Informatik
Year of publication2005
Type of documentWorking paper
Terms of use/Rights Nutzungsbedingungen
Created at2009-06-23 : 10:31:07
Last changed2015-03-06 : 10:45:26
Static URLhttp://edocs.fu-berlin.de/docs/receive/FUDOCS_document_000000002417