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US 2012/0057050 A1Published application
Systems and apparatus for image-based lighting control and security control
AssigneeKoninklijke Philips Electronics N.V.
InventorIan Edward Ashdown
Life of this patent
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Abstract
Lighting control systems are disclosed that enable a combination of functions comprising natural illumination based lighting control, occupancy-based lighting control, and security control. One or more processors are used in conjunction with one or more cameras and a plurality of luminaires, to perform a combination of functions comprising natural illumination based lighting control, occupancy-based lighting control, and security control.
Claims20
1-2. (canceled)
The lighting control system of claim 18,
- wherein the processor additionally processes the at least one image to effect an adjustable field of view associated with the camera, the processing comprising electronically masking the at least one image.
The lighting control system of claim 18,
- wherein the processor additionally processes the at least one image to effect an adjustable per-pixel sensitivity associated with the camera, the processing comprising multiplying the at least one image with a gray-scale mask image on a per-pixel basis.
The lighting control system of claim 18, wherein the processor additionally processes the at least one image to effect an increase in dynamic range associated with the camera, the processing comprising subjecting the at least one image to a logarithmic transfer function before digitizing the at least one image.
The lighting control system of claim 18,
- wherein the at least one image comprises a first image and a second image, the first image being captured before the second image;
- and
- wherein the processor processes the at least one image by combining the first image with the second image on a per-pixel basis.
(canceled)
The lighting control system of claim 18,
- wherein the processor processing the at least one image comprises:
- adaptively subsampling the at least one image to produce at least one lower resolution image for use by the processor, and
- generating a hierarchical representation of the at least one image, the hierarchical representation comprising the at least one image in a plurality of resolutions for use by the processor.
(canceled)
The lighting control system of claim 21,
- wherein the camera comprises a first camera with a first field of view, and a second camera with a second field of view, where the first field of view overlaps with the second field of view;
- and
- wherein the at least one image comprises a first image captured by the first camera, and a second image captured by the second camera;
The lighting control system of claim 21,
- wherein processing the at least one image to determine an indicator of occupancy comprises examining the at least one image to identify an occupancy-related change associated with a space;
- and
- wherein the space is related to the at least one image.
(canceled)
The lighting control system of claim 21,
- wherein the at least one image comprises at least a higher-resolution image and at least a lower-resolution image;
- and
- wherein processing the at least one image to determine an indicator of occupancy further comprises:
- examining the at least one lower-resolution image for preliminary data, the preliminary data comprising data evidencing object displacement, and
- examining the one or more higher-resolution images upon finding the preliminary data.
2 more elements
The lighting control system of claim 21,
- wherein the at least one image comprises a background image and a foreground image, the background image having been captured before the foreground image;
- and
- wherein processing the at least one image to determine an indicator of occupancy comprises at least one of:
- subtracting the background image from the foreground image on a per-pixel basis to yield a subtracted image,
- subjecting the subtracted image to an image segmentation algorithm,
- generating a set of binary images from the subtracted image, the set of binary images comprising a combination of:
- a red binary image, a green binary image, and a blue binary image, and
- applying a mipmap operator to the set of binary images to yield a set of image hierarchies comprising a combination of:
- a red image hierarchy, a green image hierarchy, and a blue image hierarchy.
6 more elements
A lighting control system comprising:
- a camera capturing at least one image and transmitting an image signal including information describing the at least one image;
- and
- a processor in signal communication with the sensor, wherein the processor is configured to receive the image signal and is further configured to execute an algorithm comprising;
- extracting, from the image signal, the information describing the at least one image;
- processing the at least one image to determine at least two of:
- an indicator of natural illumination, an indicator of occupancy, and an indicator of security;
- and
- generating a control signal for a plurality of individually-controllable luminaires based on at least one indicator,
- wherein the plurality of individually-controllable luminaires comprises a plurality of arrangements of one or more lighting units comprising one or more LED-based light sources.
6 more elements
A lighting control system comprising:
- a camera configured to capture at least one image and to transmit an image signal including information describing the at least one image;
- and
- a processor in signal communication with the camera, wherein the processor is configured to receive the image signal and is further configured to execute an algorithm, comprising:
- extracting from the image signal the information describing the at least one image,
- processing the at least one image to determine an average workplane illuminance in a space related to the at least one image,
- comparing the average workplane illuminance to a range of values, and
- in response to the average workplane illuminance being outside the range of values, generating at least one control signal for individually controlling at least one of a plurality of individually-controllable luminaires to adjust an illumination provided by the at least one luminaire.
4 more elements
A lighting control system comprising:
- a camera capturing at least one image and transmitting an image signal including information describing the at least one image;
- and
- a processor in signal communication with the camera, wherein the processor is configured to receive the image signal and is further configured to execute an algorithm, comprising:
- extracting from the image signal the information describing the at least one image,
- processing the at least one image to determine an indicator of occupancy, and
- generating a control signal for a plurality of individually-controllable luminaires based on the indicator
- wherein the at least one image comprises a combination of:
- a first set of images associated with the first color channel, a second set of images associated with the second color channel, and a third set of images associated with the third color channel;
- and
- wherein processing the at least one image to determine an indicator of occupancy comprises comparing two or more of:
- the first set of images, the second set of images, and the third set of images.
8 more elements
Dependencies are inferred from the claim text.