add video to scene

[k-okada]

add example to pubilsh images only when scene transaction detected

based on https://github.com/zzingobomi/Opencv/blob/8dc7692f680e84b5bfa4c41ee06251ec3190bf26/src/01_tutorial/03_poencv_advanced_project/13_scene_transition_detection/detect_scene.py
see https://stackoverflow.com/questions/5317744/what-is-the-best-way-to-divide-a-video-into-scenes-segments for backgrounds

used in pepper->mongo examples https://gist.github.com/k-okada/ebb29720def3a64034c39aed2b9e638b

[k-okada]

2023-01-25T04:24:21.0804215Z -------------------------------------------------
2023-01-25T04:24:21.0804830Z Full test results for 'jsk_perception/test_results/jsk_perception/rosunit-test_video_to_scene.xml'
2023-01-25T04:24:21.0805011Z -------------------------------------------------
2023-01-25T04:24:21.0805167Z <?xml version="1.0" encoding="utf-8"?>
2023-01-25T04:24:21.0805746Z <testsuite errors="1" failures="0" name="unittest.suite.TestSuite" tests="1" time="19.945"><testcase classname="__main__.TestTopicPublished" name="test_published" time="19.9453"><error type="ValueError">topic parameter 'data_class' is not initialized
2023-01-25T04:24:21.0805893Z   File "/usr/lib/python2.7/unittest/case.py", line 329, in run
2023-01-25T04:24:21.0805977Z     testMethod()
2023-01-25T04:24:21.0806169Z   File "/opt/ros/melodic/share/jsk_tools/src/test_topic_published.py", line 86, in test_published
2023-01-25T04:24:21.0806275Z     self._check_topic_pubilshed()
2023-01-25T04:24:21.0806462Z   File "/opt/ros/melodic/share/jsk_tools/src/test_topic_published.py", line 99, in _check_topic_pubilshed
2023-01-25T04:24:21.0806597Z     checker = PublishChecker(topic_name, timeout)
2023-01-25T04:24:21.0806774Z   File "/opt/ros/melodic/share/jsk_tools/src/test_topic_published.py", line 27, in __init__
2023-01-25T04:24:21.0809471Z     self.sub = rospy.Subscriber(topic_name, msg_class, self._callback)
2023-01-25T04:24:21.0810584Z   File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/topics.py", line 563, in __init__
2023-01-25T04:24:21.0810776Z     super(Subscriber, self).__init__(name, data_class, Registration.SUB)
2023-01-25T04:24:21.0811271Z   File "/opt/ros/melodic/lib/python2.7/dist-packages/rospy/topics.py", line 140, in __init__
2023-01-25T04:24:21.0811552Z     raise ValueError("topic parameter 'data_class' is not initialized")
2023-01-25T04:24:21.0811733Z </error></testcase><system-out>&lt;![CDATA[
2023-01-25T04:24:21.0811742Z 
2023-01-25T04:24:21.0811937Z ]]&gt;</system-out><system-err>&lt;![CDATA[
2023-01-25T04:24:21.0812171Z WARNING: topic [/head_camera/rgb/image_rect_color/laplacian_var] does not appear to be published yet
2023-01-25T04:24:21.0812374Z 
2023-01-25T04:24:21.0812561Z ]]&gt;</system-err></testsuite>