* log progress while matching figure image to each pdf page

* yield empty image object match to keep total

* added simple MultiLevelCache

* implemented disk cache

* added TestRegisterPickleFunction

* increased default memory cache size

* moved get_image_array_with_max_resolution

* added --pdf-scale-to argument

* convert pdf from local pdf

* show progress when loading pdf images

* workaround for auto-scaling

* log progress while checking for existing files

* added BoundingBoxScoreSummary

* added TestGetBoundingBoxMatchScoreSummary

* implemented algorithm to adjust final bounding box

* specify cache key for object keypoints

* made image id required for lower level functions

* added logging to find bounding boxes

* 2nd it to find bounding box without bounding box

* use fixed size when calculating image similarity

* calculate structural similarity using skimage

* fixed crop_image_to_bounding_box

* output score in JSON

* optionally output images with bounding boxes

* display bbox label inside if not enough space above

* sort by score, then key points

* fixed cache issue by using explicit cache key prefix

(otherwise ids may have been reused after memory being freed)

* enable debug logging for tests

* added cli scaffolding

* extract images from pdf

* fixed type hint

* added bounding box to_list

* converted bounding box to named tuple

* added tests for validate

* implemented bounding box intersection

* implemented finding bounding boxes of single image

* added test for smaller partial image

* added libgl1 for open cv

* linting: use with statement for Popen

* added support for multiple image files

* added support for xml files

* join graphic href with xml dirname

* renamed cv2 to cv

* using ObjectDetectorMatcher

* moved funtions to image object matching module

* added TestGetObjectMatch

* added ImageObjectMarchResult

* added test_should_match_smaller_image

* added test_should_match_smaller_rotated_90_image

* fixed typo ImageObjectMatchResult

* moved object_detector_matcher parameter down

* added get_image_list_object_match

* added su...

* ugraded to python 3

* upgrade pylint and pytest

* replaced StandardError

* exclude useless-object-inheritance

* python3 compatibilities uncovered by linting

* fixed tests

* fixed more python3 test incompatibilities