Abstract: Methods (and apparatuses) for providing blobs include capturing, by the tracking sensor, a tracking stream, which comprises tracking image frames, and assigning, by the capturing subsystem, each last blob of the set of last blobs to one or more traces to obtain a set of traces, and generating, by the capturing subsystem, a respective score for each trace of the set of traces based on one or more of a start location of said each trace, an initial straightness of said each trace, an acceleration of said each trace, a direction of said each trace, a gradually decreasing size of blobs assigned to said each trace, a length of said each trace, a blob count of said each trace, or a combination thereof.

Abstract: A system, a method and a calibration apparatus determine a first transformation between a first coordinate system of a first camera and a second coordinate system of a second camera by use of a third camera. The third camera captures first and second markers in its field of view. The calibration apparatus iteratively determines updated orientation components of a third transformation, between the first and third cameras. In a similar manner, the calibration apparatus iteratively determines updated orientation and translation components for a second transformation, between the first and second cameras. Furthermore, the calibration apparatus iteratively determines at least updated orientation components for the first transformation.

Abstract: Methods (and apparatuses) for providing blobs include capturing, by the tracking sensor, a tracking stream, which comprises tracking image frames, and assigning, by the capturing subsystem, each last blob of the set of last blobs to one or more traces to obtain a set of traces, and generating, by the capturing subsystem, a respective score for each trace of the set of traces based on one or more of a start location of said each trace, an initial straightness of said each trace, an acceleration of said each trace, a direction of said each trace, a gradually decreasing size of blobs assigned to said each trace, a length of said each trace, a blob count of said each trace, or a combination thereof.

Abstract: A well-defined sequence of visual stimuli, (e.g. a video file) is presented via a display unit. In parallel, a recorded video sequence is generated, which preferably represents the face of a subject watching the well-defined sequence of visual stimuli. During the presentation of well-defined sequence of visual stimuli, linked data are read out, which indicate timing information relating to the well-defined sequence of visual stimuli. The linked data are registered as metadata associated with the recorded video sequence to produce a synchronized video file, wherein each image is associated to a particular piece of timing information from the linked data. Thus, for example biometric measures derived from the recorded video sequence can be synchronized with the well-defined sequence of visual stimuli.