Standalone script for extracting images from rosbagged video feeds.

Parameters are set within the script itself, and must be the same for all ROSbags in the specified directory.

[bag directory] is the directory your .bag files are in. [image directory] is the directory you would like image files written to. Both paths should be absolute.

$ python rosrip.py [bag directory] [image directory]

• FEED_TOPIC (string): The name of the ROS topic over which the images you would like to extract were broadcast in the .bag file(s).
• COMPRESSED (boolean): Whether the images were broadcast as CompressedImage messages instead of Image messages.
• SAMPLING_FREQUENCY (int): How often you would like to sample a frame, in seconds. Technically an interval rather than a frequency.
• PREFIX (string): String prepended to all written image file names.
• SUFFIX (string): String appended to all written image file names.
• EXTENSION (string): Extension for the image format you would like, typically '.png' or '.jpg'/'.jpeg'.
• ROSBAG_DIR (string): Absolute path to the directory your ROS bags are in.
• IMAGE_DIR (string): Absolute path to the directory images should be written to.

• ROS (obviously)
• cv_bridge package