OpenCV 2.3

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OpenCV 2.3

Requirements to use OpenCV 2.3 with Scorpion 9.0 and 9.1

There are some additional requirements for OpenCV 2.3 to work with Scorpion

Install OpenCV 2.3
- Samples require that OpenCV 2.3 is installed(extracted) into C:\opencv folder
Add the OpenCV "bin" folder to the system environment path variable
- Default installation would be "C:\opencv\build\x86\vc10\bin" on 32bit windows

It is required that Numpy 1.6.1 version is installed

To verify that you have installed OpenCV 2.3 properly you can run following script in Scorpion:

import site
site.addsitedir("C:\\opencv\\build\\python\\2.6")
import cv2

If you see any errors in Scorpion console output then it means that OpenCV module was not loaded successfully. You need to verify your OpenCV installation. Make sure you do have Python 2.6 bindings for OpenCV 2.3. Verify that path is pointing to a valid location.

arrToNumpy - Scorpion helper class

All of the functions for OpenCV 2.3 accepts only numpy arrays for the image parameters. "arrToNumpy" module helps to convert Scorpion image matrix to numpy and vice versa. To convert image to numpy array use function:

numpyArray = arrToNumpy(imageMatrix)

reverse:

imageMatrix = numpyToArr(numpyArray)

Sample profiles with OpenCV 2.3

Example 1 - OpenCV 2.3 : ScriptTool AdaptiveThreshold

import cv2
from arrToNumpy import arrToNumpy, numpyToArr

try:
  #Example of a useful transform - adaptive threshold
  # cv2.adaptiveThreshold(src, maxValue, adaptiveMethod, thresholdType, blockSize, C[, dst]) -> dst
  #apply to OpenCV image, can be done in place
  data = arrToNumpy(GetImageMatr("Image"))
  cv2.adaptiveThreshold(data, 255, cv2.ADAPTIVE_THRESH_MEAN_C, cv2.THRESH_BINARY, 5, 20, data)

  #can apply morphology if desired,
  # - again safe to do in place or could make second image
  cv2.dilate(data, None, data, iterations=1)
  SetImageMatr("Output", numpyToArr(data))
except Exception, msg:
  print msg

Example 2 - OpenCV 2.3 : Adding Canny Filter

#the script reside inside a Scorpion ScriptTool
import cv2
from arrToNumpy import arrToNumpy, numpyToArr

try:
  data = arrToNumpy(GetImageMatr("Image"))
  cv2.Canny(data, 0, 255, data)
  SetImageMatr("Output", numpyToArr(data))
except Exception, msg:
  print msg

Example 3 - OpenCV 2 : Test Installation and Setup

def testOpenCV():
  import site
  site.addsitedir("C:\\opencv\\build\\python\\2.6")
  try: # verifies that cv2 is available
    import cv2
    print 'OpenCV23 installed OK'
  except:
    print 'OpenCV23 not installed'