9,970 reputation
22149
bio website
location Munich, Germany
age 36
visits member for 2 years, 6 months
seen 5 hours ago

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


Jun
14
awarded  Nice Answer
Jun
14
comment Digital filter of image in Fourier space
@Andrei: It's weird: if I import the data from Pastebin, and look at the fourier transform, it still doesn't look nearly as smooth and artifact-free as the one in your question.
Jun
14
comment Find radii of concentric circles in image
The coordinate conversion was off by one. Fixed it. I love MMA for image processing, but the distinction between indices and coordinates is ugly. Especially as there is no built-in function to convert them.
Jun
14
revised Find radii of concentric circles in image
Off-by-one error
Jun
14
comment Find radii of concentric circles in image
@cormullion: I'm not 100% sure. Since the center is a least squares estimate using all gradients in the image, the error could be due to gradients that don't point towards the center. Or maybe my index -> coordinate conversion is off by one?
Jun
14
answered Find radii of concentric circles in image
Jun
13
comment Digital filter of image in Fourier space
@Andrei: Could you upload the raw images (without ticks, legend)? In the cropped image, the Fourier transform contains all kinds of artifacts.
Jun
13
answered Digital filter of image in Fourier space
Jun
10
comment Can one identify the design patterns of Mathematica?
In the age of the dinosaur, this would have been called a "function pointer". It's an advanced concept, but not uncommon and definitely not "a very bad thing". For instance C's qsort function took a function pointer for element comparison.
May
24
comment “Save Graphic As…” does not include plot legends
If you want to export it as a raster image, you can always use Rasterize.
May
23
awarded  Good Answer
May
22
awarded  Nice Answer
May
21
answered How can I detect an ellipse in a photo?
May
21
comment How can I detect an ellipse in a photo?
I'm not sure about the hough transform: an ellipse has 5 degrees of freedom, that's a huge parameter space to update for each point.
May
15
awarded  Good Answer
May
15
awarded  Nice Answer
May
14
revised Finding areas of beings in microscopic image
Fixed another bug...
May
14
revised Finding areas of beings in microscopic image
added 221 characters in body
May
14
revised Finding areas of beings in microscopic image
added 63 characters in body
May
14
answered Finding areas of beings in microscopic image