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22150
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location Munich, Germany
age 36
visits member for 2 years, 7 months
seen 46 mins ago

I work at a small mechanical engineering company, where I develop software and image processing algorithms for camera-based inspection machines.


21h
comment ImageTransformation: polar to cartesian
@paw: The black dot is there because the polar image contains no data for that location. If you use 0 in the DataRange of the inverse transform, but used 1 in the PlotRange of the polar transform, the result will be slightly skewed (by 1 pixel at the center). You can either use 0 for both, or use Padding -> "Fixed" to get rid of the black dot in the center.
2d
answered ImageTransformation: polar to cartesian
Aug
28
comment How to identify more than one truck on a picture
@belisarius: Well, a human can do it with one camera. So it is possible. We just don't know how ;-)
Aug
27
answered Alternatives to Append/AppendTo for generating a list in an interactive DynamicModule?
Aug
20
answered How to understand the usage of Inner and Outer figuratively?
Aug
16
awarded  Nice Question
Aug
12
comment How to translate and scale an image via ImageTransformation
You could just use Composition[TranslationTransform[...], ScalingTransform[...], RotationTransform[...] ] to create a complex transformation from simple ones
Aug
1
accepted Dynamic with RegionNearest keeps one CPU core at 100% - Is this a bug?
Aug
1
accepted Can you make the new “Choose color scheme” helper larger?
Aug
1
accepted How can I find out where a key binding is coming from?
Aug
1
accepted How can I efficiently ArrayFlatten a matrix of sparse matrices?
Aug
1
asked How can I efficiently ArrayFlatten a matrix of sparse matrices?
Jul
30
revised Automatically lining up two images that have some common elements
added 139 characters in body
Jul
30
comment Automatically lining up two images that have some common elements
@Mr.Wizard: ImageTransformation can wrap. If you have per-pixel offsets (as you would have with many optical flow or non-parametric registration algorithms), this question might be useful: mathematica.stackexchange.com/questions/31274/…
Jul
29
answered Automatically lining up two images that have some common elements
Jul
26
answered Fast method to select matrix elements based on a vector of positions
Jul
25
comment Possible bug in Dynamic
@MichaelE2: You're right, this looks like a race condition: If I assign all Mathematica processes to a single CPU core, it doesn't crash anymore (or at least not that often). Maybe the WRI support people can't reproduce it because they have single core CPUs?
Jul
25
comment Possible bug in Dynamic
Yes, putting the ContourPlot inside Module[{x,y}, ... works, too. (I actually included that workaround in my WRI support ticket, but forgot it in the question here...)
Jul
25
asked Possible bug in Dynamic
Jul
23
comment Is there a way to recreate the typical Red/Blue-Postereffect using Mathematica?
I don't think you should delete the question. There are no close votes, either. But most image processing questions at least contain some img = Import[url of a good source image] code snippet, so everyone can start playing around right away, and the resulting answers are comparable.