Abstract: The invention relates to a method and an arrangement (1) for determining a group of persons (100) to be considered staying in an observation region (50) by considering exception markings (60) for other persons (200), wherein the group of persons (100) to be considered is a group of the persons (100) staying in the observation region (50) excluding the other persons (200) who stay in the observation region (50) and carry one of the exception markings (60). Thereby, the exception markings (60) are graphic pattern with at least one characteristic length ratio. In the method, at least one image is recorded of the observation region (50), and in the at least one image, the persons (100, 200) staying in the observation region (50) and optical signatures of the exception markings (60) are detected, wherein the detected optical signatures are assigned to detected persons (200).

Abstract: In a method for calibration of a stereo camera (1) comprising two cameras (2, 3) arranged in a distance along a first direction (x) and mechanically attached to a common structure, rectification functions mapping raw image coordinates to rectified coordinates are provided. Recalibration is based on images of a scene captured by the stereo camera (1) affixed in an observation position, the recalibration yielding correction functions mapping rectified coordinates to corrected coordinates. Recalibration is based on matching objects comprised in images of the captured scene obtained by the two cameras (2, 3). The stereo camera (1) is affixed in a fixed relationship with a planar surface (4), with a known distance and angle between the stereo camera (1) and the surface (4), and objects are matched in the recalibration that belong to the surface (4), wherein a disparity caused by the known distance is exploited when determining the correction functions.

Abstract: In a method for analyzing the distribution of objects in a free queue, proceeding from position information, firstly a monitoring region comprising the free queue is subdivided into a plurality of positions. Proceeding from the position information, objects assigned to the free queue are identified. Said objects are subsequently tracked. At least for a portion of the identified objects, a current waiting time in the free queue is tracked. At least for a portion of the positions of the monitoring region, the current waiting time of one or a plurality of the identified objects situated at the corresponding positions is assigned. Furthermore, the positions with assigned waiting times are classified into a plurality of classes, wherein each of the classes corresponds to a continuous waiting time range.

Abstract: In a method for determining the spatial extent of a free queue, proceeding from position information, firstly a monitoring region comprising the free queue is subdivided into a plurality of positions. Proceeding from the position information, objects assigned to the free queue are identified and tracked. A current position of at least a portion of the tracked objects is periodically stored. An average speed of at least a portion of the objects is determined, wherein the average speed of an object is determined on the basis of a plurality of the stored positions of the respective object. Finally, a first map is created, which records, in relation to the positions in the monitoring region, an occurrence density of objects at the corresponding positions, Objects having an average speed outside a predefined range are not taken into account when creating the first map.

Abstract: In a method for calibration of a stereo camera (1) comprising two cameras (2, 3) arranged in a distance along a first direction (x) and mechanically attached to a common structure, rectification functions mapping raw image coordinates to rectified coordinates are provided. Recalibration is based on images of a scene captured by the stereo camera (1) affixed in an observation position, the recalibration yielding correction functions mapping rectified coordinates to corrected coordinates. Recalibration is based on matching objects comprised in images of the captured scene obtained by the two cameras (2, 3). The stereo camera (1) is affixed in a fixed relationship with a planar surface (4), with a known distance and angle between the stereo camera (1) and the surface (4), and objects are matched in the recalibration that belong to the surface (4), wherein a disparity caused by the known distance is exploited when determining the correction functions.

Abstract: A method and a device for monitoring a monitoring region with at least two image sensors. A sub-region of the monitoring region is monitored by each of the image sensors, wherein each image sensor detects objects to be monitored that are located within the sub-region monitored by said image sensor, and each image sensor outputs data relating to the detected objects and are disposed and oriented in such a way that the monitored sub-regions overlap and that each object to be monitored that is located in the monitoring region is always detected by at least one image sensor.

Abstract: Method for determining the length of a queue of objects in a predefined region having at least one entrance and at least one exit, in the course of which errors in the acquisition of objects entering or exiting the region are corrected during the determination of the length of the queue. In a first step, a specific entry signature E of each object entering the predefined region through the at least one entrance is determined with the aid of at least one first image sensor. Thereafter, the specific entry signature E is stored in an entry list of a calculation unit, each entry signature E being provided with an index value i reflecting the temporal sequence of the entries. In addition, a value L reflecting the length of the queue of the objects is increased by one.

Abstract: In a method for determining the spatial extent of a free queue, proceeding from position information, firstly a monitoring region comprising the free queue is subdivided into a plurality of positions. Proceeding from the position information, objects assigned to the free queue are identified and tracked. A current position of at least a portion of the tracked objects is periodically stored. An average speed of at least a portion of the objects is determined, wherein the average speed of an object is determined on the basis of a plurality of the stored positions of the respective object. Finally, a first map is created, which records, in relation to the positions in the monitoring region, an appearance density of objects at the corresponding positions. Objects having an average speed outside a predefined range are not taken into account when creating the first map.

Abstract: In a method for analyzing the distribution of objects in a free queue, proceeding from position information, firstly a monitoring region comprising the free queue is subdivided into a plurality of positions. Proceeding from the position information, objects assigned to the free queue are identified. Said objects are subsequently tracked. At least for a portion of the identified objects, a current waiting time in the free queue is tracked. At least for a portion of the positions of the monitoring region, the current waiting time of one or a plurality of the identified objects situated at the corresponding positions is assigned. Furthermore, the positions with assigned waiting times are classified into a plurality of classes, wherein each of the classes corresponds to a continuous waiting time range.

Abstract: Method for determining the length of a queue of objects in a predefined region having at least one entrance and at least one exit, in the course of which errors in the acquisition of objects entering or exiting the region are corrected during the determination of the length of the queue. In a first step, a specific entry signature E of each object entering the predefined region through the at least one entrance is determined with the aid of at least one first image sensor. Thereafter, the specific entry signature E is stored in an entry list of a calculation unit, each entry signature E being provided with an index value i reflecting the temporal sequence of the entries. In addition, a value L reflecting the length of the queue of the objects is increased by one.