openLPC

open License Plate Censoring

openLPC is a tool based on openALPR and openCV to detect license plates and censoring them using gaussian blurring.

IMPORTANT Increasing the matrix size > 1 will result in a faulty result. (WIP)

Usage

Modes

There are three different modes (atm):

• image: censors a single image (provided by -path)
• imagestack: censors every image inside a given folder (provided by -path)
• video: censors a video file (provided by -path). To create a videofile as output pass -output video as argument

Arguments

  -h, --help              show this help message and exit
  -msize MATRIX_SIZE      Size of the tiling matrix
  -multiplier MULTIPLIER  Image/Frame mulitplied by given value for detection accuracy
  -path FILEPATH          path to the file (for imagestack: path to the folder)
  -pattern PATTERN        pattern for licnese plate matching (see ./runtime_data/postprocess/)
  -mode MODE              modes (image, imagestack, video)
  -output OUTPUT          output format (video, image)
  -show                   Display the output with cv2.imshow (screen required)
  -debug                  Debug mode (pink bar instead of blurred plate)

openalpr.config

The openalpr.config file contains the configuration for openALPR

• max_plate_width_percent && max_plate_height_percent is set to 5 percent, to minimize false detections. (can be adjusted depending on the size of the license plate).
• postprocess_min_confidence is down to 40 percent. The information on the licence plate does not matter for the censoring.

Examples:

Image:

python openLPC.py -path /path/to/imagefile.jpg -mode image

input:

output:

output debug:

Imagestack:

python openLPC.py -path /path/to/folder -mode imagestack

input:

output:

Video:

python openLPC.py -path /path/to/videofile.avi -mode video -output video

input:

output:

Licence

AGPL