Abstract: A method and assembly produce color images of a scene captured by an image sensor exposed to visible light as well as IR radiation. A first image is captured with a first proportion of an iris aperture covered by an IR-cut filter. A first amount of radiation captured in the first image is determined and a second image captured with a second proportion of the iris covered by the IR-cut filter. A second amount of radiation captured in the second image is determined and a proportion of IR radiation is calculated in the scene based on the first amount of light, the second amount of light, the first IR-cut filter proportion, and the second IR-cut filter proportion. An IR contribution is removed from an image by using the calculated proportion of IR radiation.

Abstract: An apparatus is disclosed for structural fixed pattern noise reduction in a video stream. A method may include, for each target pixel in a first image frame, defining a first target pixel patch, and defining a first search area comprising the first target pixel patch; for each pixel in the first search area, comparing a first pixel patch around the pixel with the first target pixel patch, and using the pixel when calculating an average for the target pixel. The method may include, in a second image frame, localizing a second target pixel, and defining a second search area comprising the second target pixel; for each pixel in the second search area, comparing a second pixel patch around the pixel of the second search area with the first target pixel patch, and using the pixel in the second search area when calculating an average for the target pixel.

Abstract: A method of focusing a camera with a movable field of view includes obtaining a current field of view setting corresponding to a current field of view of the camera, retrieving, based on the obtained current field of view setting, focusing data pertaining to the focusing method that was previously used to focus the camera for a previous field of view, at least partly overlapping the obtained current field of view, by accessing a focusing assisting database comprising a plurality of camera focusing entries, wherein each camera focusing entry includes a respective previous field of view setting, corresponding to a respective previous field of view and thereto associated focusing data pertaining to the focusing method that was previously used to focus the camera for the respective previous field of view.

Abstract: A system for tracking movable objects in a scene comprising a first overview unit arranged to capture a first overview of a first portion of a scene, and a second overview unit arranged to capture a second overview of a second portion of a scene, wherein the first portion and the second portion may be partly overlapping. The system further comprises a PTZ-camera to image selected objects in the first or second portion of the scene. The first and the second overview unit are configured to detect and locate moving objects in the scene, and to transmit positional data of said moving objects to a control unit that determines if two or more movable objects may be imaged using a single view of the PTZ-camera, and to send instructions to the PTZ-camera to image said two or more movable objects concurrently.

Abstract: The present invention relates to a method for encoding digital video data corresponding to a sequence of digital source images using a cache memory, each of the digital source images having an equal source image width corresponding to a first number of blocks, the cache memory having a cache width corresponding to a second number of blocks, wherein the second number of blocks is smaller than the first number of blocks.

Abstract: A method for, in a map of background objects, registering presence of a stationary object exhibiting motion at a location in a scene monitored by a radar detector comprising detecting over time radar echoes at a radar detector monitoring a scene. The moving object is one of a true moving object or a stationary object exhibiting motion. The over time detected radar echoes are evaluated for finding a stationary object exhibiting motion. The presence of the stationary object exhibiting motion is registered at a location, corresponding to the location of the stationary object exhibiting motion, in a map of background objects. A method for detecting moving objects using a radar detector is also presented wherein the map of background objects is used as input.

Abstract: A method for visual transmission and reception of repeatedly changing information comprises repeatedly performing the following set of actions, receiving a first set of information to transmit, the first set of information is an update of a previously received set of information, generating an information carrying first pattern representing the first set of information; displaying the information carrying first pattern in a first color; receiving a second set of information to transmit, the second set of information is an update of the first set of information; generating an information carrying second pattern representing the second set of information; displaying the information carrying second pattern in a second color, the second color differs from the first color; and wherein one of the information carrying patterns is statically displayed when another one of the information carrying patterns is updated.

Abstract: There is provided a method and an apparatus for updating a background model used for background subtraction of an image. The method comprises: receiving an image (220), and classifying a region (226) in the image as foreground by performing background subtraction using a background model (240). The background model comprises a collection of background samples (248, 248b, 248c, 248d) for each pixel (228) in the image. The collection of background samples is arranged in a list of background images (242a, 242b, 242c, 242d). The method further comprises: replacing image contents in the region (226) of the image which is classified as foreground by image contents of a corresponding region (246) in a background image in the list, and adding the image to the list of background images by rearranging a collection of pointers (244a, 244b, 244c, 244d) which each points to one of the background images in the list, such that one of the pointers instead points to the image.

Abstract: A method performed in a processing unit for determining calibration data to be used when processing data from a sensor unit connected to the processing unit, the method including receiving, from the sensor unit, an identifier which identifies and is calculated based on calibration data stored in the sensor unit, checking if there is an identifier stored in the processing unit identical to the received identifier, where the identifier stored in the processing unit identifies and is calculated based on calibration data stored in the processing unit, if an identical identifier is stored in the processing unit, using the calibration data stored in the processing unit identified by the identical identifier when processing data from the sensor unit, if no identical identifier is stored in the processing unit, requesting the sensor unit to transmit calibration data, and using the requested calibration data when processing data from the sensor unit.

Abstract: A near-infrared sensitive video camera comprises a control unit configured to: dynamically detect a setting of the camera, the setting being one or more of: a zoom level, a focus setting and a setting of an IR-illuminator of camera. The control unit dynamically acquires a gain setting map for an image sensor, the acquired gain setting map being associated with the dynamically detected setting of the camera and comprising individual gain settings of the image sensor. Dynamically acquiring the gain setting map comprises accessing a database of gain setting maps associated with specific settings of the camera and on the dynamically detected setting of the camera; and dynamically adjusting a gain setting of the image sensor based on the acquired gain setting map.

Abstract: A method for sequential control of a diaphragm arrangement of a camera, the arrangement comprising a diaphragm, and an integrated IR cut filter always covering at least a portion of an aperture opening of the diaphragm, comprising: initiating closing or opening of the diaphragm; detecting an amount of incident radiation when the diaphragm has an initial aperture opening; shifting the aperture opening to an intermediate aperture opening to alter the ratio between visible light and infrared radiation passing the diaphragm; detecting an amount of incident radiation following the shift; calculating a composition of visual light and infrared radiation in the scene from the detected amounts of incident radiation and a calculated ratio between visible light and infrared radiation when having the initial aperture opening and the intermediate aperture opening, respectively; and shifting the aperture opening of the diaphragm to a new position.

Abstract: Methods and apparatus, including computer program products, implementing and using techniques for classifying an object occurring in a sequence of images. The object is tracked through the sequence of images. A set of temporally distributed image crops including the object is generated from the sequence of images. The set of image crops is fed to an artificial neural network trained for classifying an object. The artificial network determines a classification result for each image crop. A quality measure of each classification result is determined based on one or more of: a confidence measure of a classification vector output from the artificial neural network, and a resolution of the image crop. The classification result for each image crop is weighed by its quality measure, and an object class for the object is determined by combining the weighted output from the artificial neural network for the set of images.

Abstract: A device and method for providing additional functionality to an apparatus having a network connector by which the apparatus is configured to be connected to a network and to be allocated an identifier in the network, wherein the device is adapted to be connected between the network and the apparatus, wherein the device is configured to communicate with the network using a first network portion, wherein the device is configured to communicate with the apparatus using a second network portion, wherein logic circuitry of the device is accessible in the network via the apparatus using the second network portion. The device may be found in a system.

Abstract: The present invention relates generally to video communication systems, and more specifically to a method and device for adjusting properties of a graphical overlay for a video stream, the adjusted properties being at least one of a position, a degree of animation and a color composition of the graphical overlay and the adjustment is based on a scene depicted by the time period of the video stream. The adjustment is performed if an estimated bitrate for transmitting an encoded bitstream comprising the time period of the video stream and the graphical overlay exceeds a predetermined upper threshold bitrate for transmitting an encoded single bitstream comprising the time period of the video stream and the graphical overlay.

Abstract: There is provided a method for controlling an infrared cut, IR-cut, filter of a video camera. An indication to switch state of the IR-cut filter of the video camera is received, and a switch of state of the IR-cut filter is synchronized with a video encoding of frames captured by the video camera, such that the IR-cut filter is controlled to switch state when the video camera is about to capture a frame which is a predetermined number of frames before a frame which is scheduled to be encoded as an intra-frame.