News and updates

19 May 2010: Together with the Dutch Planbureau voor de Leefomgeving, we have written a paper titled "The use of ontologies in peer reviews of Integrated Assessment Models". It has been accepted for publication at the "Conference on Environmental Modelling and Software".

25 March 2010: A paper of mine has been accepted for publication in the journal Computers and Electronics in Agriculture. The paper deals with the challenge to automate knowledge-intensive tasks. Task-performing software is often opaque, which has a negative impact on a system’s adaptability and on the end user’s understanding and trust of the system’s operation. A more transparent, declarative way of specifying the expert knowledge required in such software is needed, but may have a negative impact on the speed of the application. The paper accepted by Computers and Electronics in Agriculture discusses criteria that can be used to decide on the best level of transparency.

23 February 2010: Following a press release concerning my PhD thesis, the radio station BNR news radio asked Guus Schreiber, Tom Demeyer and me to participate in a discussion on the Semantic Web and its applications. The show was broadcast live on Tuesday afternoon. A link to the mp3 files can be found in the press part on the publications page.

My PhD thesis8 February 2010: On February 8, I have defended my Ph.D. thesis and obtained the degree of Doctor. My thesis discusses a method to design knowledge-intensive computer vision applications that can successfully deal with inspecting biological objects. The main contributions of my thesis to the field of knowledge-intensive computer vision are:

1. The proposed design method aims to create a well-balanced transparent system in which knowledge is expressed explicitly wherever that is possible and useful.

2. The domain expert is the central figure in the design method: his knowledge guides the design of the software system.

3. Knowledge engineering and software engineering work together to obtain a transparent computer vision system.

The work was demonstrated with a case study on automated tomato seedling inspection.

3 August 2009: The first week of July, the JIAC conference took place at Wageningen, the Netherlands. JIAC is the Joint International Agricultural Conference, consisting of the EFITA, Precision Agriculture and Precision Lifestock Farming Conferences. I presented a paper on the high speed imaging acquisition method that we use for inspecting tomato seedlings. The paper can be found in the publications section.

14 February 2009: The first week of February, I attended the third Asian Semantic Web Conference in Bangkok, Thailand. There, I presented our work on the ROC-method, a method for reuse-based ontology construction by domain experts. The corresponding publication can be accessed in the publications section, a visual impression of Bangkok can be found on our personal homepage in the photo section.

For each flower in the image a trajectory has been found23 January 2009: The flower tracking publication in "Computers and Electronics in Agriculture" from Stephan Harmsen and me (see news item of October 12, 2008) has lead to some publicity on professional websites. A journalist called for an article in the university magazine of Wageningen. The national press agency picked up on this article and within a couple of hours, the new multi-target tracking method for flower counting was mentioned on a dozen professional websites. In the publications section, I have stored several versions of the resulting media attention.

28 December 2008: On November 18, a seminar was organised as final activity in the Food Informatics project. The lectures in the seminar have been published in aA word cloud covering the Food Informatics field special issue of the Agro Informatica, published by VIAS. The article covering the ROC method is added to my list of publications.

12 October 2008: Two new publications have been added to the list of publications: a chapter in the book "Bubbles for Food 2" on a computer vision application to automatically distinguish the crust from the bread cumb, and a paper in "Computers and Electronics in Agriculture" on automatically counting flowers on a rotating pot plant.

25 July 2008: A new publication is added: "Ontologieën in Voeding" in the professional journal <!Element. The paper discusses some RDF aspects of two projects that we have worked on at A&F.

Graphical presentation of the plant ontology18 November 2007: Most of my publications are now available as a pdf-file. I have also added a page that contains a selection of interesting links. If you care to contribute to this page, please send me your suggestions.

 

14 October 2007: Welcome to my homepage. It has gone live today, although not all information is available yet. I hope to add content to the webpage in the next weeks.