JSON Plate Results
Rekor Scout® generates an alpr_results JSON value for every frame of video in which a license plate is recognized. This value will be sent multiple times for a single vehicle. For example, as a vehicle drives past the camera over the course of three seconds, Scout may recognize the same license plate fifty times. All fifty recognition results will be recorded as alpr_results JSON values.
The number of recognition results largely depends on the processing speed and number of cameras being processed. A faster processor will produce more of these per vehicle because it is able to process video frames at a faster rate.
Individual plate results are best suited for applications that need to operate on plate data in real time.
JSON Plate results are sent in the following format:
{
"processing_time_ms":105.850112915039,
"data_type":"alpr_results",
"uuid":"YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY-1234-1562681608425",
"version":2,
"camera_id":1234,
"results": [
{
"plate_index":0,
"coordinates": [
{
"x":3257,
"y":188
},
{
"x":3467,
"y":194
},
{
"x":3460,
"y":307
},
{
"y":302,
"x":3247
}
],
"processing_time_ms":47.0029602050781,
"plate_crop_jpeg":"... base 64 image data ...",
"plate":"D2651BF",
"vehicle_region": {
"y":0,
"x":3042,
"height":630,
"width":630
},
"region":"us-mo",
"confidence":92.9419174194336,
"matches_template":0,
"requested_topn":10,
"candidates": [
{
"plate":"D2651BF",
"confidence":92.9419174194336,
"matches_template":0
},
{
"plate":"D2651F",
"matches_template":0,
"confidence":80.8129653930664
},
{
"matches_template":0,
"confidence":80.0941772460938,
"plate":"D265BF"
},
{
"plate":"D251BF",
"matches_template":0,
"confidence":79.946403503418
}
],
"region_confidence":40
},
{
"requested_topn":10,
"candidates": [
{
"matches_template":1,
"confidence":94.7376327514648,
"plate":"CG3L5Y"
},
{
"confidence":79.4123077392578,
"matches_template":0,
"plate":"CGL5Y"
},
{
"plate":"CG3L5",
"confidence":79.0777206420898,
"matches_template":0
}
],
"region_confidence":99,
"confidence":94.7376327514648,
"region":"us-mo",
"matches_template":1,
"plate_crop_jpeg":"... base64 image data ...",
"plate":"CG3L5Y",
"vehicle_region": {
"x":821,
"height":1512,
"y":0,
"width":1512
},
"plate_index":1,
"coordinates": [
{
"y":882,
"x":1419
},
{
"x":1744,
"y":893
},
{
"y":1055,
"x":1736
},
{
"y":1044,
"x":1409
}
],
"processing_time_ms":47.0029602050781
}
],
"agent_version":"2.7.101",
"error":false,
"company_id":"XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX",
"epoch_time":1562681608425,
"agent_uid":"YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY", # Taken from /etc/openalpr/install_id
"img_width":4096,
"regions_of_interest": [
{
"x":0,
"height":2160,
"y":0,
"width":4096
}
],
"agent_type":"alprd",
"img_height":2160
}Last updated
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