Monthly Archives: October 2007

Answers to Common Questions

Checking the proceedings after the ACM Multimedia reminded me of the las slide of Mike Gleicher. His paper was best paper nominee and dealt with post processing of videos to enhance the camera motion quality (straight motion and zoom, remove shaking etc.). He presented notable results and at the end of his talk he gave some answers:

  • I don’t know.
  • No, we don’t introduce cuts.
  • The details are in the paper, send me email if its not clear.
  • Friends in industry say they can do the camera motion estimation robustly, in real time.
  • Yes, I would like to go to Oktoberfest Friday.
  • Our in-painter builds a 4 second mosaic for each frame.
  • 2
  • Logarithms and exponents of 3×3 matrices can be computed robustly and efficiently with iterative methods.
  • Yes, this slide is an old joke –but I haven’t used it in years.

Ref. Michael Gleicher and Feng Liu. Re-Cinematography: Improving the Camera Dynamics of Casual Video. ACM Multimedia 2007, best paper nominee. September 2007. [on his homepage]

Report from SWAt 11

Yesterday evening Semantic Web Atelier (SWAt) 11 took place in Graz, Austria. We had one great talk from Martin Höffernig about the architecture and implementation for a semantic validation service for multimedia metadata documents called VAMP. Martin had support from Werner Bailer and Georg Thallinger who also described the broader context of the work in detail.

So what does VAMP do? In short words: This validation service allows to verify the (partial) semantic correctness of an XML (especially MPEG-7) file. Take for example the temporal decomposition of a video file described in XML. You’ve scenes (longer sequences of video frames), which are grouping shots (shorter sequences of video frames). One semantic constraints is that no shot start point (time in the video) can occur before the start point of the parent scene. The same goes for end points: With the parent scene all child shots should end. However in distributed environment one can never be sure. Also automatic extraction routines also fail to detect the exact frame number, where shot boundaries are found. A semantic validation service provides means to detect such semantic errors and that’s what VAMP does.

More information can be found on the VAMP website and I think Martin Höffernig, Werner Bailer and Georg Thallinger are open to questions :-D

[Note this is a cross post from here]

Moved ImageSeams to Google Code

With the v4 version I decided to put up a project at Google Code for the whole thing as I needed Subversion support and some way to handle the downloads. You’ll find all information on the project there.

Co-developers are of course welcome :)

Content Based Image Resizing (GPL, Java): Update to v4

I’ve just uploaded a maintenance release. Biggest change is that the seam table is now re-used. Therefore computation is somewhat faster. I’ve also cleaned out the code and made more ‘readable’. Fell free to download and comment:

Other tools (stand alone, plugins, etc.) are reviewed for instance here. Seems like there is a “war of seam carving tools” going on. Many of those are closed source, perhaps some people are trying to make money selling old shoes :-D The roadmap for this implementation is clear: If the following two constraints are met development is going on:

  • Someone (including me) needs some feature / performance upgrade or finds some bug
  • Someone (possibly me) finds some time to implement the feature / performance upgrade

Mom’s Exploit

Some time ago I subscribed the comic stream at I get at least some of my inspirations from there. Normally I wouldn’t do this but I’ve got to post this one here …

btw. xkcd offers the strips on a creative commons license. Thanks!

The MPEG-21 Multimedia Framework

Christian Timmerer (active contributor to the MPEG standards) has blogged about the MPEG-21 multimedia framework. I like his post as it brings the current state of MPEG-21 to the point. And therefore it is one of the rare information snippets outsiders can access  :D You’ll find also the links to the appropriate parts of the standard as well as links to the publicly available parts.

SWAt 11: Call For Participation

This post is actually only a copy of the one on the SWAt blog, which is implicitely announcd by this statement. We’d like to use the SWAt blog to announce and write about events as well as give summaries of things happening and happened.

Original announcement: While there has been a long break (since April ‘07) the next Semantic Web Atelier is already planned and on its way. Werner Bailer, Michael Hausenblas & Martin Höffernig (Joanneum Research) present VAMP – A semantic validation service for MPEG-7 Profiles Description.

The SWAt is scheduled on Oct. 17th 2007 starting at 17.3o in Graz, at the Know-Center. We’d like to invite everyone (people from industry and research as well as lecturers and students) to participate. For further questions either comment this entry or write a mail to swat <at> know-center <dot> at.

How to get there: View map

CfP: Workshop on Common Sense Knowledge and Goal-Oriented Interfaces

The workshop CSKGOI’08 takes place at the at IUI’08 in January 2008. Topics include, but are not limited to: 

Knowledge Acquisition:

  • Mining of common sense knowledge and goals from different corpora
  • Algorithms and techniques for collaborative knowledge acquisition
  • Methods for knowledge validation

Knowledge Representation

  • Representational theories of commonsense knowledge
  • Distributed forms of knowledge representation, such as goal-oriented ontologies and metadata
  • Goal-oriented modeling languages and frameworks
  • Algorithms for goal-centered reasoning and inference

User Interfaces

  • Integrating commonsense knowledge and inference into user interfaces
  • Observational and interactive techniques for goal elicitation and recognition
  • Evaluation of goal-oriented user interfaces
  • Goal-oriented software configuration

Full papers as well as demo descriptions (+ screen shots) are accepted for submission. Submission deadline is Nov. 11th 2007. The full CfP as well as additional information are available on the CSKGOI’08 homepage.