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Jan Motl

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05 Jun 2013 Screenshot Nick local image thresholding Nick's binarization performs local image thresholding. Author: Jan Motl binarization, local thresholding, image processing 21 0
05 Jun 2013 Screenshot Wolf local image thresholding Wolf's binarization performs local image thresholding. Author: Jan Motl binarization, local thresholding, image processing 12 0
17 May 2013 Screenshot Meanthresh local image thresholding Meanthresh performs a simple local image thresholding. Author: Jan Motl binarization, local thresholding, image processing 34 0
17 May 2013 Screenshot Remove ghosts from binarized images This method removes speckles in the binarized images. Author: Jan Motl binarization, thresholding, image processing 45 0
16 May 2013 Screenshot Average Filter Average filter performs image smoothing with integral image method. Author: Jan Motl image, smoothing, image processing, average filter, mean filter, fast 49 2
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4.0 | 1 rating
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05 Jun 2013 Bradley local image thresholding A fast an well performing local image thresholding method. Author: Jan Motl

You can try to increase the size of the sliding window. Don't be afraid to increase the windows size to hundreds to hundreds pixels - the window should be bigger than the biggest symbol in the image.

Or you can try the post-processing step from Yanowitz and Bruckstein's binarization method: http://www.mathworks.com/matlabcentral/fileexchange/41786-remove-ghosts-from-binarized-images

Basically it looks at the edge of each foreground object. And if the average gradient along the edge is small, it concludes that it's false foreground object and deletes the object.
25 Apr 2013 Continuous Dynamic Time Warping A version of the DTW algorithm. The CDTW calculates the similarity between 2 vectors Author: Pau Micó

19 Apr 2013 Gray image thresholding using the Triangle Method Computes a threshold the Triangle method. Author: Bernard Panneton

It's giving different threshold than triangle method in ImageJ applied to the same image.
14 Apr 2013 Gray image thresholding using the Triangle Method Computes a threshold the Triangle method. Author: Bernard Panneton

30 Mar 2013 arrow.m Draw a line with an arrowhead. Author: Erik Johnson

Comments and Ratings on Jan's Files View all
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05 Jun 2013 Bradley local image thresholding A fast an well performing local image thresholding method. Author: Jan Motl Motl, Jan

You can try to increase the size of the sliding window. Don't be afraid to increase the windows size to hundreds to hundreds pixels - the window should be bigger than the biggest symbol in the image.

Or you can try the post-processing step from Yanowitz and Bruckstein's binarization method: http://www.mathworks.com/matlabcentral/fileexchange/41786-remove-ghosts-from-binarized-images

Basically it looks at the edge of each foreground object. And if the average gradient along the edge is small, it concludes that it's false foreground object and deletes the object.
04 Jun 2013 Bradley local image thresholding A fast an well performing local image thresholding method. Author: Jan Motl Neudecker, Max

This method works quite well for binarizing my samples!
Note: I found that, depending on the grayvalue variations, a lot of background pixels are wrongly segmented as foreground. However, masking with another binary image, binarized e.g. with Otsu's threshold (function graythresh), remedied this.
02 Apr 2013 Magic kernel resizing The “magic kernel” is a method of resampling images that gives clear results free of artifacts. Author: Jan Motl bmv

I mean : B=magickernel(magickernel(A),'DOWN');

02 Apr 2013 Magic kernel resizing The “magic kernel” is a method of resampling images that gives clear results free of artifacts. Author: Jan Motl bmv

After these transformations:
A;
B=magickernel(magickernel(A),'DAWN');
Should A and B be the same? (A=B ?)
28 Feb 2013 Average Filter Average filter performs image smoothing with integral image method. Author: Jan Motl Motl, Jan

Hi Jan,
thank you for your feedback. The biggest gain from the vectorised version is in calculation of the integral image - cumsum accelerated the whole function by 5%. And that is good.
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image processing, binarization, local thresholding, image, smoothing
Files Tagged by Jan View all
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05 Jun 2013 Screenshot Nick local image thresholding Nick's binarization performs local image thresholding. Author: Jan Motl binarization, local thresholding, image processing 21 0
05 Jun 2013 Screenshot Wolf local image thresholding Wolf's binarization performs local image thresholding. Author: Jan Motl binarization, local thresholding, image processing 12 0
17 May 2013 Screenshot Meanthresh local image thresholding Meanthresh performs a simple local image thresholding. Author: Jan Motl binarization, local thresholding, image processing 34 0
17 May 2013 Screenshot Remove ghosts from binarized images This method removes speckles in the binarized images. Author: Jan Motl binarization, thresholding, image processing 45 0
16 May 2013 Screenshot Average Filter Average filter performs image smoothing with integral image method. Author: Jan Motl image, smoothing, image processing, average filter, mean filter, fast 49 2
  • 4.0
4.0 | 1 rating

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