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2016-02-13 07:40:38 -0600	received badge	● Supporter (source)
2016-02-10 13:42:31 -0600	commented answer	Estimate white background A top hat with a 15x15 structuring element succeeds in extracting the characters (see the link)
2016-02-10 13:37:59 -0600	received badge	● Editor (source)
2016-02-10 10:38:46 -0600	commented answer	Estimate white background From your image: `board = mh.imread('/home/jeanpat/Images/paperboard.jpg',-1) cut = board[40:,10:1000] cut = cut.max()-cut print cut.shape, cut.max() kernel = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(15,15)) cut_f = cv2.morphologyEx(cut,cv2.MORPH_TOPHAT, kernel)` (mh is a shortcut for mahotas, but it should possible to load the image with cv2 itself) link text
2016-02-10 10:06:39 -0600	answered a question	Estimate white background What about a top-hat filtering? From an ipython console: `kernel18 = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(18,18)) filtered = cv2.morphologyEx(image, cv2.MORPH_TOPHAT, kernel18)` The image may has to be converted into a greyscaled image. It's possible to get something like this image with a smaller kernel (clik on the link) http://postimg.org/image/k7n2fjrfd/
2016-02-10 07:05:55 -0600	asked a question	import cv2 fails (opencv 3.1 build from source,linux) Hello, I build opencv 3.1 from source on manjaro linux. I used cmake-gui then make and sudo make install without visible problems. I can find cv2: `$ pwd /usr/local/lib/python2.7/site-packages [jeanpat@dip4fish site-packages]$ ls cv2.so` But python (2 or 3) is unable to import the cv2 module: `$ python2 Python 2.7.11 (default, Dec 6 2015, 15:43:46) [GCC 5.2.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named cv2` Thank you for your advices to fix that issue.
2014-11-06 11:59:47 -0600	asked a question	Building opencv 3 alpha under Ubuntu 14.04 with CUDA failed Hello As I try to build opencv 3 alpha with cuda support, I have the following message CMake Error: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files: CUDA_nvcuvid_LIBRARY (ADVANCED) linked by target "opencv_cudacodec" in directory /home/jeanpat/App/opencv-3.0.0-alpha/modules/cudacodec Cuda 5.5 from repo is installed: `* libcuda1-331 nvidia-cuda-dev nvidia-cuda-toolkit` Is it necessary to install the latest cuda-6.5.14_linux_64.run ?
2013-03-13 15:15:31 -0600	received badge	● Scholar (source)
2013-03-13 07:10:05 -0600	commented question	Regional maxima from python There a definition in Castleman, K : http://bit.ly/13VyHL7 If you think of an image as a landscape, regional maxima yields the local tops. This not the max value of the image. I have browsing again the documentation but that morphological operator doesn't seem to be implemented.
2013-03-13 05:26:37 -0600	asked a question	Regional maxima from python Hello, Is it possible to compute the regional maxima of a grey scaled image (8bits or more) ? thank you jp (opencv 244 build from source, python 2.7)