/usr/share/openalpr/config/openalpr.defaults.conf is in libopenalpr-data 2.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | ; Specify the path to the runtime data directory
runtime_dir = /usr/share/openalpr/runtime_data
ocr_img_size_percent = 1.33333333
state_id_img_size_percent = 2.0
; Calibrating your camera improves detection accuracy in cases where vehicle plates are captured at a steep angle
; Use the openalpr-utils-calibrate utility to calibrate your fixed camera to adjust for an angle
; Once done, update the prewarp config with the values obtained from the tool
prewarp =
; detection will ignore plates that are too large. This is a good efficiency technique to use if the
; plates are going to be a fixed distance away from the camera (e.g., you will never see plates that fill
; up the entire image
max_plate_width_percent = 100
max_plate_height_percent = 100
; detection_iteration_increase is the percentage that the LBP frame increases each iteration.
; It must be greater than 1.0. A value of 1.01 means increase by 1%, 1.10 increases it by 10% each time.
; So a 1% increase would be ~10x slower than 10% to process, but it has a higher chance of landing
; directly on the plate and getting a strong detection
detection_iteration_increase = 1.1
; The minimum detection strength determines how sure the detection algorithm must be before signaling that
; a plate region exists. Technically this corresponds to LBP nearest neighbors (e.g., how many detections
; are clustered around the same area). For example, 2 = very lenient, 9 = very strict.
detection_strictness = 3
; The detection doesn't necessarily need an extremely high resolution image in order to detect plates
; Using a smaller input image should still find the plates and will do it faster
; Tweaking the max_detection_input values will resize the input image if it is larger than these sizes
; max_detection_input_width/height are specified in pixels
max_detection_input_width = 1280
max_detection_input_height = 720
; detector is the technique used to find license plate regions in an image. Value can be set to
; lbpcpu - default LBP-based detector uses the system CPU
; lbpgpu - LBP-based detector that uses Nvidia GPU to increase recognition speed.
; lbpopencl - LBP-based detector that uses OpenCL GPU to increase recognition speed. Requires OpenCV 3.0
; morphcpu - Experimental detector that detects white rectangles in an image. Does not require training.
detector = lbpcpu
; If set to true, all results must match a postprocess text pattern if a pattern is available.
; If not, the result is disqualified.
must_match_pattern = 0
; Bypasses plate detection. If this is set to 1, the library assumes that each region provided is a likely plate area.
skip_detection = 0
; Specifies the full path to an image file that constrains the detection area. Only the plate regions allowed through the mask
; will be analyzed. The mask image must match the resolution of your image to be analyzed. The mask is black and white.
; Black areas will be ignored, white areas will be searched. An empty value means no mask (scan the entire image)
detection_mask_image =
; OpenALPR can scan the same image multiple times with different randomization. Setting this to a value larger than
; 1 may increase accuracy, but will increase processing time linearly (e.g., analysis_count = 3 is 3x slower)
analysis_count = 1
; OpenALPR detects high-contrast plate crops and uses an alternative edge detection technique. Setting this to 0.0
; would classify ALL images as high-contrast, setting it to 1.0 would classify no images as high-contrast.
contrast_detection_threshold = 0.3
max_plate_angle_degrees = 15
ocr_min_font_point = 6
; Minimum OCR confidence percent to consider.
postprocess_min_confidence = 65
; Any OCR character lower than this will also add an equally likely
; chance that the character is incorrect and will be skipped. Value is a confidence percent
postprocess_confidence_skip_level = 80
debug_general = 0
debug_timing = 0
debug_detector = 0
debug_prewarp = 0
debug_state_id = 0
debug_plate_lines = 0
debug_plate_corners = 0
debug_char_segment = 0
debug_char_analysis = 0
debug_color_filter = 0
debug_ocr = 0
debug_postprocess = 0
debug_show_images = 0
debug_pause_on_frame = 0
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