Methods, a non-transitory computer readable memory and a device for updating a track of an object

A method for updating a track of an object in relation to a current image frame, comprising:

• determining, using a first computer implemented tracker, a first track of an object in a sequence of image frames preceding the current image frame, wherein the first computer implemented tracker is updated in at least a first subset of image frames of the sequence of image frames based on an object detection from a computer implemented object detector using an object detection algorithm, and wherein the first track includes a respective estimated location of the object in each image frame of the first subset of image frames of the sequence of image frames;
• predicting, using a motion model of the first computer implemented tracker, a location in the first track of the object in the current image frame;
• determining that a second track is associated with the first track, wherein the second track is determined in the sequence of image frames preceding the current using a second computer implemented tracker, wherein the second computer implemented tracker is updated in at least a second subset of image frames of the sequence of image frames based on motion detection from a computer implemented motion detector using a motion detection algorithm;
• receiving, from the second computer implemented tracker, an estimated location in the second track of the object in the current image frame;
• and
• only on condition that the estimated location in the second track of the object in the current image frame does not overlap a different track than the first track in the current image frame:
• updating, using the first computer implemented tracker, the predicted location of the object in the current image frame based on the received estimated location in the second track of the object in the current image frame, thereby determining an estimated location in the first track of the object in the current image frame.

A non-transitory computer-readable medium comprising computer program code which, when executed by a device with processing capability, causes the device to carry out a method for updating a track of an object in relation to a current image frame, comprising:

• determining, using a first computer implemented tracker, a first track of an object in a sequence of image frames preceding the current image frame, wherein the first computer implemented tracker is updated in at least a first subset of image frames of the sequence of image frames based on an object detection from a computer implemented object detector using an object detection algorithm, and wherein the first track includes a respective estimated location of the object in each image frame of the first subset of image frames of the sequence of image frames;
• predicting, using a motion model of the first computer implemented tracker, a location of the object in the current image frame;
• receiving, from a computer implemented motion detector using a motion detection algorithm, determined respective locations of detected motion areas in the current image frame;
• determining, using the first computer implemented tracker, based on the predicted location of the object in the current image frame, and the determined respective locations of the detected motion areas, that a detected motion area of the detected motion areas is associated with the object in the current image frame;
• and
• only on condition that the detected motion area determined to be associated with the object does not overlap a different track than the first track:
• updating, using the first computer implemented tracker, the predicted location of the object in the current image frame based on the determined location of the detected motion area determined to be associated with the object in the current image frame, thereby determining an estimated location of the object in the current image frame.