Abstract: Some embodiments are directed to an occupancy sensor calibration device (100) arranged to repeatedly detect an occupancy in vision data and a concurrent occupancy detection in the occupancy data, determine a location of the detected occupancy in the vision data, and store the location as part of the occupancy sensing region.

Abstract: Some embodiments are directed to an occupancy sensor calibration device (100) arranged to repeatedly detect an occupancy in vision data and a concurrent occupancy detection in the occupancy data, determine a location of the detected occupancy in the vision data, and store the location as part of the occupancy sensing region.

Abstract: The present invention relates to a method for controlling a lighting device in a daylight harvesting system. When a user tampers with a sensor, in order to decrease the light level light level measured and therefore increase the light intensity of the lighting device, the tampering is detected. Based on this tamper detection the light intensity of the lighting device is controlled based on a set value (e.g. 70% dimming).

Abstract: A controller comprising: presence detection logic, calibration logic, and an input for receiving a reading from a light sensor representing a sensed light level. The presence detection logic is for detecting presence events based on a presence sensor, and is configured to indicate a set-point to operate at least one lighting device in dependence on a positive detection of presence. The calibration logic is for performing a calibration operation, which is performed by causing a light output of the lighting device to change between a first, lower level and a second, higher level, and by and calibrating the set-point based on the reading from the light sensor under influence of the first and second levels. The calibration logic is configured to trigger this calibration operation in response to the positive detection of presence.

Abstract: A passive infrared sensor system comprising: a direct current (DC) voltage source supplying a DC voltage; a passive infrared sensor supplied with the DC voltage, the passive infrared sensor comprising at least one sensor element; an alternating current (AC) voltage source supplying an AC voltage, the AC voltage source arranged to induce an alternating current to flow through said at least one sensor element; an amplifier arranged to amplify an output signal that is output from the passive infrared sensor to generate an amplified output signal; and a filter arranged to filter the amplified output signal to provide an output of the passive infrared sensor system, wherein the filter is configured to filter a frequency of the AC voltage.

Abstract: A controller comprising: presence detection logic, calibration logic, and an input for receiving a reading from a light sensor representing a sensed light level. The presence detection logic is for detecting presence events based on a presence sensor, and is configured to indicate a set-point to operate at least one lighting device in dependence on a positive detection of presence. The calibration logic is for performing a calibration operation, which is performed by causing a light output of the lighting device to change between a first, lower level and a second, higher level, and by and calibrating the set-point based on the reading from the light sensor under influence of the first and second levels. The calibration logic is configured to trigger this calibration operation in response to the positive detection of presence.

Abstract: The present invention relates to a method for controlling a lighting device in a daylight harvesting system. When a user tampers with a sensor, in order to decrease the light level light level measured and therefore increase the light intensity of the lighting device, the tampering is detected. Based on this tamper detection the light intensity of the lighting device is controlled based on a set value (e.g. 70% dimming).

Abstract: A room dividing lighting device 120, 122, the use of the room dividing lighting device and a method of installing the room dividing lighting device are provided. The room dividing lighting device 120, 122 comprises a light emitting means. The room dividing lighting device 120, 122 is used for separating a subspace 104 from a space 102 to prevent a person 114, 118 from coming close to or entering the subspace 104 in a privacy operational mode of the room dividing lighting device 120, 122. The light emitting means emits light in an upward direction and is configured to emit, in a privacy operational mode, glary light in a light beam 108 for hindering the person 114, 118 who enters the light beam 108 or crosses it with his eyes 112, 116. The light emitting means comprises at least one light source and a light redirection means.

Abstract: A color image enhancement method, for enhancing the color of a color image comprising a plurality of pixels. The method comprises: mapping a color saturation value of each pixel to a normalized saturation value, wherein the range of values of normalized saturation is the same independent of the luminance value of the pixel; estimating a probability distribution of the normalized saturation values; defining a transfer function for modifying the normalized saturation values, based on the estimated probability distribution; and applying the transfer function to the normalized saturation values to generate modified values.

Abstract: A video signal processing apparatus for processing a video signal comprises a receive unit (101, 103, 105) which receives the video signal comprising a sequence of pictures. A processing unit (107) applies a picture noise changing algorithm to the sequence of pictures and a variation unit (113) varies a spatial noise reduction setting for the picture noise changing algorithm between at least some consecutive pictures of the sequence of pictures in response to a predetermined variation rule. Specifically a set of picture manipulation processes (203, 205) with different spatial noise reduction characteristics may be provided and the variation unit (113) may select different picture manipulation processes in consecutive pictures. The approach may introduce high frequency noise flickering which is less perceptible to a viewer thereby reducing the perceived noise.

Abstract: A controller for a multi-primary display having M>3 primaries receives a set of input N-primary image color defining values comprising drive values for N primaries for each pixel. A compensator (317) generates a set of compensated N-primary image color (N>=3) defining values by applying a luminance compensation to the values of the set of input N-primary image color defining values where the luminance compensation for each pixel depends on the chromaticity of the pixel. A backlight processor (311) determines backlight levels in response to the compensated N-primary image color defining values. A modifier (313) then generates modified N-primary image color defining values by adjusting the input or the modified N-primary image color defining values or the for the backlight level and a primary converter (315) converts the modified N-primary image color defining values into multi-primary drive values for the display. The approach may e.g.

Abstract: A device and method for rendering content that includes analyzing previous and/or subsequent temporal portions of a content signal to determine elements that are positionally related to elements of a current portion of the content signal. The current portion of the content signal is rendered on a primary rendering device, such as a television, while the elements that are positionally related to elements of a current portion of the content signal are concurrently rendered on a secondary rendering device. In one embodiment, the elements that are rendered on the secondary rendering device may be rendered at a lower resolution and/or lower frame rate than the rendered current portion of the content signal. In one embodiment, at least one of previous and subsequent temporal portions of a content signal may be analyzed at a lower resolution than the content signal.

Abstract: The novel method of electronic color image processing comprises: inputting an image; obtaining a color (A) based on colors present in at least a first part of the image; and changing a saturation correlate (S2) defined with respect to the color (A) for at least a second part of the image. This allows for better quality saturation modification on a larger number of possible input images.

Abstract: An apparatus and method for primary color correction and clipping is provided that is particularly suited for application in mobile displays. It is a combination of a brightness reduction, and a ‘smart’ clipping algorithm and is based on the perceptual attribute “colorfulness”, in which images that are brighter seem to posses more color. In the smart clipping algorithm, a brightness reduction is followed by a gamut (primary) correction and then a smart clip is performed by “adding white” to the out-of-gamut pixels only. This reduces the saturation while it increases the brightness. That is, the saturation is decreased in favor of increased brightness, which gives similar colorfulness on a mobile display as on an EBU display. This smart clipping affects those colors that cannot be represented on the display.

Abstract: An apparatus for enhancing at least a region of an input picture having input pixel values enabling a reduction of quantization banding artifacts including an estimation unit arranged to estimate a quantization precision of at least the region of the input picture, a pattern analysis unit arranged to determine positions in the input picture of changes in input pixel value of less than or equal to the quantization precision, and to output analysis information representing the positions, and an adaptive filter, arranged to calculate an output picture corresponding to at least the region of the input picture, comprising output pixels being determined on the basis of adaptive combinations of input pixels, and arranged to determine the adaptive combinations in dependence on the analysis information.

Abstract: A method converts an input image signal (IS) into a drive signal (DS) for driving sub-pixels (SP) of a display device (DD) comprising display pixels (DPI) having at least two sub-pixel groups (SG1, SG2) being able to contribute to luminance information displayed. The conversion comprises a multi-primary conversion (MPC) which receives the input image signal (IS) and which is performed under a constraint (CO). The constraint (CO) is determined (CD) by substantially matching local display luminances (DL1, DL2; DLD) associated with the at least two sub-pixel groups (SG1, SG2) with corresponding local input luminances (L1, L2; LD) of input pixels (IP) of the input image signal (IS), thereby obtaining a display luminance pattern defined by the display pixels (DPI) corresponding to an input luminance pattern defined by the input pixels (IP) associated with the display pixels (DPI).

Abstract: A video signal compensator (10, 70, 80, 290) for selectively compensating for age-related non-uniformities in a display, receives an indication of motion or detects motion in an incoming video signal, and receives or determines an indication of amounts of compensation for the different parts of the display needed to compensate for the non-uniformities. The compensator selectively applies the needed amount of compensation to the video signal according to the indicated motion to apply less of the needed compensation where there is less motion, over at least some of the range of possible motions. This can reduce the drive levels at least where the non uniformities are less visible because of the motion in the video. The reduced drive levels can lead to less ageing and thus prolong display life. The amounts of needed compensation can be predicted or determined from measured outputs of pixels of the display.

Abstract: A display control apparatus comprises a video source(105) which provides a video signal comprising frames. The video source (105) is coupled to a compensation processor (107) which filters at least part of a first frame to provide a compensation for perceived motion blur. A display output (109) feeds the compensated video signal to a display (103) which presents the frame. A controller (111) is arranged to control the display (103) such that it radiates light in a sequence of light pulses for each frame where the sequence of light pulses comprising at least some light pulses having different durations. A motion blur processor (113) determines a suitable compensation filter for the perceived motion blur compensation as one that corresponds to an inverse filter of the sequence of light pulses. The use of pulsed light radiation modifies the hold effect filtering such that it can be better and more easily compensated by pre-filtering.

Abstract: A method of processing image data comprises receiving input signals for specifying red, green and blue colors of the pixels of a display, performing a per-pixel low pass filtering of the input signals, the low pass filtering function being dependent on the chrominance variation between adjacent pixels, and providing the filtered output signals for use in driving the pixels of a display. This method essentially measures the chrominance variation of the incoming signal, in the form of the color change frequency, and depending on this variation, adaptively low-pass filters the incoming signal. This can be in such a way that the chrominance resolution of the outgoing signal is below the maximum chrominance resolution of the intended display, without errors in the average color of a small group of pixels.

Abstract: A method of redistributing an N-primary color input signal (IS) having a particular number?4 (N) of input components (I1, . . . , IN) into N-primary color output signal (OS) having the particular number (N) of output components (P1, . . . , PN) under a constraint (CON2). The method comprises defining (MPRC) three functions (F1, F2, F3) representing three (P1, P2, P3) of the output components (P1, . . . , PN) as a function of the remaining N-3 output components (P4, . . . , PN). Substituting (MPRC) the values of the input components (I1, . . . , IN) into the three functions (F1, F2, F3) to determine unknown coefficients (P1?, P2?, P3?) of the three functions (F1, F2, F3). And, determining (MPRC) optimal values of the output components (P1, . . . , PN) by applying the constraint (CON2) to the three functions (F1, F2, F3).