3 research outputs found
alternative clustering methods, sub-pixel accurate object extraction from still images, and generic video segmentation
This paper presents a practical approach for object extraction from still
images and video sequences that is both: simple to use and easy to implement.
Many image segmentation projects focus on special cases or try to use
complicated heuristics and classificators to cope with every special case. The
presented approach focuses on typical pictures and videos taken from everyday
life working under the assumption that the foreground objects are sufficiently
perceptual different from the background. The approach incorporates
experiences and user feedback from several projects that have integrated the
algorithm already. The segmentation works in realtime for video and is noise
robust and provides subpixel accuracy for still images
Experiments on lecturer segmentation using texture classification and a 3D camera
In our system for recording and transmitting lectures over the Internet the
board content is sent as vector graphics, yielding 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 on the board image at video stream rates. The lecturer can be
dimmed by the remote viewer from opaque to semitransparent, or even
transparent. This paper explains the two techniques we apply to achieve this:
texture classification based segmentation, and segmentation using a novel 3D
camera based on the time-of-flight of backscattered light principle. We argue
that this technique provides a solution to the divided attention problem which
arises when board and lecturer are transmitted in two different streams