Understanding Event Response Data for License Plate Recognition

Event response \ Event response data example

Response contains XML document, data fields are as follows:

Field	Description
TS	Event timestamp, Unix timestamp, UTC, milliseconds
MOD_TS	Event timestamp, human readable
CAR_ID	Vehicle ID, per database id
LPR	Number plate as text
RTIME	License plate recognition duration, ms
ACTION	Barrier action taken : 0= "no action", 1 = "opened"
ACT_PARAM	deprecated
THRESHOLD	Recognition confidence value, float
ROI_X	ROI coordinates and dimensions
ROI_Y
ROI_W
ROI_H
LP_X	Number plate crop coordinates and dimensions
LP_Y
LP_W
LP_H
LP_BMP	URL of a plate image stored on a camera
ROI_BMP	URL of a ROI image stored on a camera, if enabled
COUNTRY	Alpha3 ISO3166 country code https://en.wikipedia.org/wiki/ISO_31661_alpha3
ROI_ID	ROI number, ACAP is supporting 2 ROI inthe frame
ROI_IDU	reserved
FRAMES	reserved
DISTANCE	reserved
SPEED	reserved
DIRECTION	2 IN   3 OUT    0,1- UNKNOWN

    

Event response data example

<event>

<TS>1528371395804689</TS>

<MOD_TS>2023-05-17 14:36:36 TRT</MOD_TS>

<CAR_ID>66948</CAR_ID>

<LPR>2AN2563</LPR>

<RTIME>150.0</RTIME>

<ACTION>0</ACTION>

<ACT_PARAM></ACT_PARAM>

<THRESHOLD>0.717648804187775</THRESHOLD>

<ROI_X>53</ROI_X>

<ROI_Y>54</ROI_Y>

<ROI_W>1728</ROI_W>

<ROI_H>972</ROI_H>

<LP_X>1501</LP_X>

<LP_Y>288</LP_Y>

<LP_W>168</LP_W>

<LP_H>28</LP_H>

<ROI_ID>1</ROI_ID>

<ROI_IDU>0</ROI_IDU>

<FRAMES>0</FRAMES>

<DISTANCE>0</DISTANCE>

<SPEED>0</SPEED>

<DIRECTION>1</DIRECTION>

<LP_BMP>tools.cgi?action=getImage&amp;name=45/20230517143636_205385lp_2AN2563_2176954.png</LP_BMP>

<ROI_BMP>tools.cgi?action=getImage&amp;name=44/20230517143635_805012lp_2AN2563_2176951.png</ROI_BMP>

<COUNTRY>CZE</COUNTRY>

</event>