US 12,283,057 B2
Device and method for enhancing tracking of objects in a scene captured in a video sequence
Niclas Danielsson, Lund (SE); Markus Skans, Lund (SE); and Anton Öhrn, Lund (SE)
Assigned to AXIS AB, Lund (SE)
Filed by Axis AB, Lund (SE)
Filed on Feb. 12, 2024, as Appl. No. 18/439,200.
Claims priority of application No. 23160912 (EP), filed on Mar. 9, 2023.
Prior Publication US 2024/0303828 A1, Sep. 12, 2024
Int. Cl. G06T 7/246 (2017.01)
CPC G06T 7/246 (2017.01) [G06T 2207/10016 (2013.01); G06T 2207/20021 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for selecting a crop score threshold for enhancing tracking of objects in a scene captured in a video sequence, the method comprises:
obtaining a respective track for each of two different objects, wherein each track comprises crops of object instances of the respective object in the scene captured in a calibration video sequence, and wherein each crop has a crop score and a feature vector;
splitting each track into respective two or more tracklets thereby forming four or more tracklets;
for each candidate crop score threshold of a set of candidate crop score thresholds:
determining a respective feature vector for each of the four or more tracklets based on feature vectors of crops of the tracklet having a crop score above the candidate crop score threshold; and
determining a respective difference between each tracklet of the four or more tracklets and each other tracklet of the four or more tracklets as a respective difference between each determined respective feature vector and each other determined respective feature vector; and
selecting a crop score threshold from the set of candidate crop score thresholds resulting in a maximum difference between a measure of the determined differences between feature vectors from tracklets of different tracks and a measure of the determined differences between feature vectors from tracklets of the same track.