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Merge pull request #19762 from lukasalexanderweber:master

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* Error Message for SURF if not implemented

In OpenCV 4.5.1 

import cv2 as cv
cv.xfeatures2d_SURF.create

will not create an AttributeError, even if the function is excluded (no nonfree option)

In Line 305 (now 306) however ´finder = FEATURES_FIND_CHOICES[args.features]()´ will raise an 

error: OpenCV(4.5.1) ..\opencv_contrib\modules\xfeatures2d\src\surf.cpp:1029: error: (-213:The function/feature is not implemented) This algorithm is patented and is excluded in this configuration; Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function 'cv::xfeatures2d::SURF::create'

So we should check with cv.xfeatures2d_SURF.create() correctly if SURF is available
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Lukas-Alexander Weber 2021-03-24 16:02:20 +01:00 committed by GitHub
parent 7949983c41
commit 7c4b873ba3
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samples/python/stitching_detailed.py
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@ -29,8 +29,9 @@ BA_COST_CHOICES['no'] = cv.detail_NoBundleAdjuster
FEATURES_FIND_CHOICES = OrderedDict() FEATURES_FIND_CHOICES = OrderedDict()
try: try:
cv.xfeatures2d_SURF.create() # check if the function can be called
FEATURES_FIND_CHOICES['surf'] = cv.xfeatures2d_SURF.create FEATURES_FIND_CHOICES['surf'] = cv.xfeatures2d_SURF.create
except AttributeError: except (AttributeError, cv.error) as e:
print("SURF not available") print("SURF not available")
# if SURF not available, ORB is default # if SURF not available, ORB is default
FEATURES_FIND_CHOICES['orb'] = cv.ORB.create FEATURES_FIND_CHOICES['orb'] = cv.ORB.create