OpenCV Workshop Python distribution of keywords

List of the 50 most represented OpenCV members of the Python package in the documentation examples.

• ShowImage 43
• NamedWindow 30
• Scalar 29
• RGB 28
• CV_RGB 28
• CreateImage 27
• Sub 26
• Round 25
• WaitKey 24
• __name__ 19
• Zero 19
• Line 17
• CV_AA 17
• Load 15
• CloneImage 15
• Set 14
• LoadImage 14
• Copy 14
• ScalarAll 12
• RealScalar 12
• GetSize 12
• CreateMat 12
• CreateTrackbar 11
• Convert 11
• GetSubRect 10
• DestroyWindow 10
• Scale 9
• Circle 9
• Threshold 8
• DFT 8
• Min 6
• CreateMemStorage 6
• ConvertScale 6
• Add 6
• RandInt 5
• RandArr 5
• IPL_DEPTH_64F 5
• CV_RAND_NORMAL 5
• CV_FILLED 5
• CV_32FC 5
• CV_32F 5
• 32FC 5
• Subdiv2DRotateEdge 4
• SetIdentity 4
• QueryFrame 4
• Pow 4
• Or 4
• Erode 4
• Dilate 4
• CvtColor 4

This is done via

import os.path
import re

import cv

cv_vars = vars(cv)
# some patterns could be ignore, e.g. __ found in __name__
cv_vars_counters = dict()

examples_path = '/usr/share/doc/opencv-doc/examples/python/python/'
examples = os.listdir(examples_path)

for example in examples:
        if example.endswith('.py'):
                f = open(examples_path+example,'r')
                content = str(f.readlines())
                for var in cv_vars.keys():
                        # this could be limited to built-in functions instead
                        val = cv_vars_counters.setdefault(var,0)
                        occurrences = len(re.findall(var,content))
                        cv_vars_counters[var] = val + occurrences
                f.close()

for key, value in sorted(cv_vars_counters.iteritems(), key=lambda (k,v): (v,k)):
    print "%s: %s" % (key, value)

#The output can be processed to be shared on a wiki page, e.g.
# python atoms_distribution.py | tail -50 | tac | sed "s|\(.*\): \(.*\)|* [http://opencv.willowgarage.com/documentation/python/search.html?q=\1 \1] \2|"

See OpenCV Workshop.