Color emphasis and preservation of objects using reflection spectra

• US 9,345,099 B2
• Filed: 07/15/2013
• Issued: 05/17/2016
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Baaijens, Johannes Petrus Wilhelmust, Van Hoof, Willem Piet, Rutgers, Andrew Ulrich
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): COOPER, JONATHAN G
• Application Number:
  US14/417,203
• Publication Number:
  US 20150230316A1
• Time in Patent Office: 1,037 Days
• Field of Search: 315148-153
• US Class Current: 1/1
• CPC Class Codes: A47F 3/001 Devices for lighting, humidifying, heating, ventilation
• CPC Class Codes: G09F 13/00 Illuminated signs; Luminous advertising G09F9/00, G09F11/00 take precedence; control of displays in general using static means to present variable information G09G
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 2013/222 with LEDs
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 47/105 in response to determined parameters

Abstract

A lighting arrangement (100, 300, 400, 600) configured to illuminate an object (108, 308, 408, 608), the lighting arrangement (100, 300, 400, 600) configured to emit light of a plurality of colors, and a control unit for controlling mixed light emitted by the lighting arrangement is disclosed. The control unit is configured to determine the object (108, 308, 408, 608) to be illuminated and to receive a reflection spectrum of the object. Then, the control unit selects control parameters for mixed light emitted by the lighting arrangement, the mixed light having an illumination spectrum matching the reflection spectrum of the object based on predetermined parameters relating to the type of object. Furthermore, the lighting arrangement illuminates the object based on the selected control parameters provided by the control unit. A corresponding method and a computer program product are also disclosed.

Claims

1. A lighting arrangement configured to illuminate an object, the lighting arrangement configured to emit light of a plurality of colors, the lighting arrangement comprising a control unit configured to:

determine the type of object to be illuminated;

receive a reflection spectrum of the object;

select control parameters for controlling mixed light emitted by the lighting arrangement, the mixed light having an illumination spectrum matching the reflection spectrum of the object based on predetermined parameters relating to the type of object, and

control the lighting arrangement for illuminating the object based on the selected control parameters,

wherein the lighting arrangement further comprises a detector in communication with the control unit provided for identifying the object, and a database storing a plurality of pre-stored reflection spectra, wherein a pre-stored reflection spectrum of the object is acquired from the database comprising the plurality of pre-stored reflection spectra,

wherein the predetermined parameters comprises a predetermined minimum color rendering index level of the mixed light emitted by the lighting arrangement, wherein the control unit is configured to select parameters for the mixed light emitted by the lighting arrangement such that the predetermined minimum color rendering index level is achieved.

2. The lighting arrangement according to claim 1, further comprising a plurality of light sources arranged to emit the mixed light.

3. The lighting according to claim 1, wherein a color rendering index level of mixed light emitted by the lighting arrangement is at least 70.

5. The lighting arrangement according to claim 1, further comprising a sensor in communication with the control unit and configured to measure the reflection spectrum of the object.

8. The lighting arrangement according to claim 1, wherein the detector is configured to identify the object through color and shape of the object.

4. A lighting arrangement configured to illuminate an object, the lighting arrangement configured to emit light of a plurality of colors, the lighting arrangement comprising a control unit configured to:

determine the type of object to be illuminated;

receive a reflection spectrum of the object;

select control parameters for controlling mixed light emitted by the lighting arrangement, the mixed light having an illumination spectrum matching the reflection spectrum of the object based on predetermined parameters relating to the type of object, and

control the lighting arrangement for illuminating the object based on the selected control parameters,

wherein the lighting arrangement further comprises a detector in communication with the control unit provided for identifying the object, and a database storing a plurality of pre-stored reflection spectra, wherein a pre-stored reflection spectrum of the object is acquired from the database comprising the plurality of pre-stored reflection spectra,

wherein the database comprises results of computations of color saturation level and color rendering index for illumination spectra that are based on colors of a plurality of light sources in the lighting arrangement.

6. A lighting arrangement configured to illuminate an object, the lighting arrangement configured to emit light of a plurality of colors, the lighting arrangement comprising a control unit configured to:

determine the type of object to be illuminated;

receive a reflection spectrum of the object;

select control parameters for controlling mixed light emitted by the lighting arrangement, the mixed light having an illumination spectrum matching the reflection spectrum of the object based on predetermined parameters relating to the type of object, and

control the lighting arrangement for illuminating the object based on the selected control parameters,

wherein the lighting arrangement further comprises a detector in communication with the control unit provided for identifying the object, and a database storing a plurality of pre-stored reflection spectra, wherein a pre-stored reflection spectrum of the object is acquired from the database comprising the plurality of pre-stored reflection spectra,

wherein the control unit is configured to maintain a perceived color by adjusting the illumination spectrum based on human eye color sensitivity, and control parameters are determined for the mixed light emitted by the lighting arrangement, such that the perceived color is achieved.

7. A lighting arrangement configured to illuminate an object, the lighting arrangement configured to emit light of a plurality of colors, the lighting arrangement comprising a control unit configured to:

determine the type of object to be illuminated;

receive a reflection spectrum of the object;

select control parameters for controlling mixed light emitted by the lighting arrangement, the mixed light having an illumination spectrum matching the reflection spectrum of the object based on predetermined parameters relating to the type of object, and

control the lighting arrangement for illuminating the object based on the selected control parameters,

wherein the lighting arrangement further comprises a detector in communication with the control unit provided for identifying the object, and a database storing a plurality of pre-stored reflection spectra, wherein a pre-stored reflection spectrum of the object is acquired from the database comprising the plurality of pre-stored reflection spectra,

wherein the predetermined parameters comprises a human eye color sensitivity spectrum, wherein the control unit is arranged to weight the illumination spectrum to the human eye color sensitivity spectrum to reduce light emitted by the lighting arrangement.

9. A method for controlling a lighting arrangement, comprising the steps of:

determining the type of object to be illuminated;

receiving a reflection spectrum of the object;

matching an illumination spectrum to the reflection spectrum of the object based on predetermined parameters relating to the type of object;

selecting control parameters for the mixed light emitted by the lighting arrangement, such that an illumination spectrum is matching the reflection spectrum with regard to the type of object;

controlling the lighting arrangement to emit light according to the selected control parameters, wherein the method further comprises the steps of;

identifying the object with a detector;

acquiring a pre-stored reflection spectrum for said object from a database,

setting a predetermined minimum color rendering index level of mixed light emitted the lighting arrangement; and

selecting control parameters for the mixed light emitted by lighting arrangement such that the predetermined color rendering index level is achieved.

10. The method for controlling a lighting arrangement according to claim 9, wherein the database further comprises results of computations of color saturation level and color rendering index for illumination spectra that are based on colors of a plurality of light sources in the lighting arrangement.

11. The method for controlling a lighting arrangement according to claim 10 further comprising the step of acquiring the reflection spectrum by measuring the reflection spectrum of the object with a sensor.

14. The method according to claim 9, wherein the object is a light sensitive artifact.

12. A method for controlling a lighting arrangement comprising the steps of:

determining the type of object to be illuminated;

receiving a reflection spectrum of the object;

matching an illumination spectrum to the reflection spectrum of the object based on predetermined parameters relating to the type of object;

selecting control parameters for the mixed light emitted by the lighting arrangement, such that an illumination spectrum is matching the reflection spectrum with regard to the type of object;

controlling the lighting arrangement to emit light according to the selected control parameters, wherein the method further comprises the steps of;

identifying the object with a detector;

acquiring a pre-stored reflection spectrum for said object from a database;

maintaining a perceived color by adjusting the illumination spectrum based on human eye color sensitivity; and

selecting control parameters for the mixed light emitted by the lighting arrangement such that the perceived color is achieved.

13. A method for controlling a lighting arrangement comprising the steps of:

determining the type of object to be illuminated;

receiving a reflection spectrum of the object;

matching an illumination spectrum to the reflection spectrum of the object based on predetermined parameters relating to the type of object;

selecting control parameters for the mixed light emitted by the lighting arrangement, such that an illumination spectrum is matching the reflection spectrum with regard to the type of object;

controlling the lighting arrangement to emit light according to the selected control parameters, wherein the method further comprises the steps of;

identifying the object with a detector;

acquiring a pre-stored reflection spectrum for said object from a database;

weighting the illumination spectrum matching to the reflection spectrum of the object with a human eye color sensitivity spectrum.