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1. WO2018069827 - A METHOD OF IDENTIFYING LIGHT SOURCES, CORRESPONDING SYSTEM AND COMPUTER PROGRAM PRODUCT

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

1. A method of controlling a lighting system including a set of lighting devices (SI, S6) for lighting an environment, the method including:

- receiving (100) from at least one image sensor

(W) an image signal including a sequence of images of said environment under different conditions of illumination and light reflection,

- processing (102 to 120) said image signal to provide a light source identification signal (120) representative of light sources affecting said environment, and

controlling said set of lighting devices

(SI, S6) as a function of said light source identification signal (120) .

2. The method of claim 1, wherein processing said image signal includes estimating (120) the number of light sources affecting said environment.

3. The method of claim 1 or claim 2, wherein processing said image signal includes identifying, and preferably localizing (120), the light sources and/or the illumination strength of the light sources affecting said environment.

4. The method of any of the previous claims, wherein controlling said set of lighting devices

(SI, S6) includes selectively activating/deactivating lighting devices in said set

(SI, , S6) , preferably by detecting the presence of occupants (P) in said environment and selectively switching-off lighting devices covering areas in said environment unobserved by said occupants and/or by adjusting the illumination strength of the lighting devices, preferably based on occupants' activities.

5. The method of any of the previous claims, wherein processing said image signal includes:

- extracting (114) illumination conditions of said environment from said sequence of images to provide shading information (114),

identifying the number of said light sources affecting said environment by linear dimensionality reduction, LDR (118), preferably by one of non-negative matrix factorization, NMF, and non-negative matrix under approximation, NMU or PNMU.

6. The method of any of the previous claims, wherein processing said image signal includes generating (102, 104, 106) from said sequence of images a nearly Lambertian sequence wherein the brightness of surfaces (S) in said environment are independent of the angle of view.

7. The method of claim 6, including applying reflectance and shading decomposition (112) to said nearly Lambertian sequence.

8. The method of claims 5, 6 and 7, including applying said linear dimensionality reduction, LDR to said nearly Lambertian sequence to which reflectance and shading decomposition (112) has been applied.

9. A lighting system including a set of lighting devices (SI, S6) for lighting an environment, the system including:

- at least one image sensor (W) for generating an image signal including a sequence of images of said environment under different conditions of illumination and light reflection,

- a processing module (1000) coupled to said at least one image sensor (W) , said processing module

(1000) configured for receiving and processing said image signal (100) and controlling said set of lighting devices (SI, S6) according to the method of any of claims 1 to 8.

10. A computer program product, loadable in at least one processing module (1000) and including software code portions for performing the method of any of claims 1 to 8.