Rekor Scout®
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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
}