| 2009-05-30 | Yes, I made it! Stockholm Marathon two minutes faster than last year: 3:32:21. Considerably slower pace the last 12 km than first 30 km, but better disposed than last year. |
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| 2009-05-29 | My ideas on search space reduction seem to work. A few matches are incorrect because the entire search space is not traversed, but there are more mismatches that are avoided by limiting the number of match candidates. Of course, I already use the epipolar constraint and image pyramids - the new idea reduces the search space even more. It is still pretty slow because of the rational polynomial sensor model: to determine object space (X,Y) from image space (x,y) and object space Z requires solving a nonlinear equations system and this transformation is done a lot... |
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| 2009-05-29 | Received my bib and chip for Stockholm Marathon tomorrow. My number is 1603. I have not trained as much as last year, but maybe I will beat last years 3:34:44 by simpy running at a more steady pace... |
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| 2009-05-29 | Corrected the exams in the course Digital Image Processing and Applications. Eight students wrote the exam. |
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| 2009-05-28 | Worked on different matching criteria for the DSM generator. |
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| 2009-05-28 | Found the reason for the bug in Metria CityModeler: If
the area covered by a stereo pair crosses an UTM zone, different zone numbers were used
on either side, resulting in incorrect Euclidian object coordinates. The zone number is now
fixed to either what the user specifies or to the automatically set zone, which is derived from the
latitude and longitude. The bug fix is included in Metria CityModeler 4.4. |
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| 2009-05-27 | Fixing a bug in Metria CityModeler. |
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| 2009-05-27 | Debugging the image matching for the DSM generator. |
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| 2009-05-26 | It has been quite some days since last update. The reason is that I have been to Joint Urban Remote Sensing Event in Shanghai, China. The conference was ok with some nice papers, e.g. the state-of-the-art paper by Franz Rottensteiner: "Status and Further Prospects of Object Extraction from Image and Laser Data" with some 80 valuable references. Some pictures from Shanghai can be found here. |
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| 2009-05-15 | Made the poster for my presentation of WALZ (WAvelet Lidar Zipper) at Joint Urban Remote Sensing Event. |
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| 2009-05-15 | Last lecture on Digital Image Processing and Applications, only that this time I did not give the lecture. Instead, the students had oral presentations on subjects of their choice, e.g. change detection, artificial neural networks, motion deblurring, refugee camp mapping, graph vectorization etc. |
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| 2009-05-14 | Spent rest of the day on search space reduction for the DSM generator. Too little done to tell for sure if I am on the righ track... |
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| 2009-05-14 | Finally, the exam for the Digital Image Processing and Applications course and the re-exam for the Photogrammetry course are both done and it is almost 1pm. This took way too much time... |
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| 2009-05-13 | Started writing the exam for the Digital Image Processing and Applications course. This has taken all day, but finally I have chosen a set of questions, but I have still not formatted the questions and I have to make a re-exam for the Photogrammetry course! |
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| 2009-05-12 | Still working on search space reduction for the DSM generator. The code got a bit messy after many tests on different approaches. I refactored some code today and while doing so I found a bug. After it was fixed, I am pretty convinced that I have found a working solution for the search space problem, but I need a couple of more days to verify that. |
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| 2009-05-11 | Still working on search space reduction for the DSM generator. No great break through today... |
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| 2009-05-10 | Improved the ReVisitor DXF library. |
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| 2009-05-10 | Continued work on the DSM generator. |
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| 2009-05-08 | Uploaded this "blog". I had a similar one a year ago, but I did not update it on a regular basis. Now, I start all over to keep you and me updated on what is going on at ReVisitor. Bookmark this page and get back every now and then to learn how ReVisitor converts research in photogrammetry, remote sensing, computer vision and lidar into easy-to-use 3D products and software! |
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| 2009-05-08 | Lecture on remote sensing LiDAR and Change Detection. |
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| 2009-05-07 | Preparations of lecture on Change Detection in Remote Sensing. Interesting to learn different algorithms. You may think that once you have co-registered two image sets from different times, you just take the difference, pixel-by-pixel and band-by-band, but there are many more effective ways to reveal changes both quantatively and qualitatively. |
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| 2009-05-07 | Meeting with a potential partner in 3D building reconstruction software development. |
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| 2009-05-06 | Fixed some format problems with my parser of TerraSolid binary files. |
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| 2009-05-06 | Development of DSM generator. Progress on efficient and robust reduction of the search space while matching at a single image pyramid level. A reduced search space not only make the DSM generation faster, it can also reduce mismatches, since highly unlikely matching candidates are ruled out. |
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| 2009-05-06 | Preparations of a research proposal. |
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| 2009-05-05 | Planning of trip to Joint Urban Remote Sensing Event, where I will present the paper "Fast Compression and Access of LiDAR Point Clouds using Wavelets". |
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| 2009-05-05 | Preparations of a research proposal. |
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| 2009-05-05 | Lecture on remote sensing classification and LiDAR. |
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| 2009-05-04 | Preparations of a lecture on remote sensing classification and another lecture on LiDAR. |
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| 2009-05-04 | Preparations of a research proposal. More details will be provided if the proposal is accepted. |
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| 2009-05-04 | Sent in tax declaration for ReVisitor AB. |
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| 2009-05-04 | Meeting about VisuCity at Sightline. I presented my progress on the ReVisitor CityGML library for CityGML.
A CityGML example created with the ReVisitor CityGML library and displayed with the Autodesk LandXplorer viewer. |
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| 2009-05-01 | Development of DSM generator. |
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