node-openalpr-region/openalpr_runtime/config/us.conf

Node.js OpenALPR Bindings

; 30-50, 40-60, 50-70, 60-80
char_analysis_min_pct = 0.30
char_analysis_height_range = 0.20
char_analysis_height_step_size = 0.10
char_analysis_height_num_steps = 4

segmentation_min_box_width_px = 4
segmentation_min_charheight_percent = 0.5;
segmentation_max_segment_width_percent_vs_average = 1.35;

plate_width_mm = 304.8
plate_height_mm = 152.4

multiline = 0

char_height_mm = 70
char_width_mm = 35
char_whitespace_top_mm = 38
char_whitespace_bot_mm = 38

template_max_width_px = 120
template_max_height_px = 60

; Higher sensitivity means less lines
plateline_sensitivity_vertical = 25
plateline_sensitivity_horizontal = 45

; Regions smaller than this will be disqualified
min_plate_size_width_px = 70
min_plate_size_height_px = 35

ocr_language = lus

; Override for postprocess letters/numbers regex. 
postprocess_regex_letters = [A-Z]
postprocess_regex_numbers = [0-9]