Web image transfer system using LED based lighting systems

• US 20050285145A1
• Filed: 06/23/2004
• Published: 12/29/2005
• Est. Priority Date: 06/23/2004
• Status: Abandoned Application

• Current Assignee: Rensselaer Polytechnic Institute
• Original Assignee: Rensselaer Polytechnic Institute
• Inventors: Narendran, Nadarajah
• Application Number:
  US10/874,930
• Publication Number:
  US 20050285145A1
• Time in Patent Office: Days
• US Class Current: 257/200
• CPC Class Codes: H04N 17/02 for colour television signals

Abstract

A system for transmitting a color image over a network. The system has a light source, a first reference color chart exhibiting a first spectral response, a camera capturing an image of the first reference color chart for transmission to a receiver, and a receiver for displaying the image. The displayed image exhibits a second spectral response. The system also has a second reference color generator replicating the first spectral response, a comparator for generating a signal responsive to a difference between the replicated first spectral response and the second spectral response, and an adjuster for adjusting the displayed image responsive to the signal.

Claims

1. A system for transmitting a color image over a network, the system comprising:

a light source;

a first reference color means exhibiting a first spectral response;

a camera capturing an image of the first reference color means for transmission to a receiver;

a receiver for displaying the image, the displayed image exhibiting a second spectral response;

a second reference color means replicating the first spectral response;

a comparator for generating a signal responsive to a difference between the replicated first spectral response and the second spectral response; and

an adjuster for adjusting the displayed image responsive to the signal.

2. The system of claim 1, wherein the light source is an adjustable light source.

3. The system of claim 2, wherein the adjustable light source is a light emitting diode.

4. The system of claim 2, wherein the adjustable light source comprises a plurality of light emitting diodes.

5. The system of claim 1, wherein the light source is a color tunable light source.

6. The system of claim 5, wherein the color tunable light source includes at least one red light source, one green light source, and one blue light source.

7. The system of claim 1, wherein the first reference color means includes a color chart.

8. The system of claim 1, wherein the adjuster includes a feedback circuit between the receiver and the light source.

9. The system of claim 1, wherein the comparator includes a sensor for measuring an intensity of the second spectral response.

10. The system of claim 1, where the comparator includes a color sensor system for measuring a spectrum of the displayed image.

11. The system of claim 1, wherein the receiver comprises a display screen having at least one light emitting diode.

12. The system of claim 1, wherein the adjuster includes a circuit for adjusting the displayed image in an iterative manner.

13. An illumination system comprising:

a reference color chart having a first spectral response;

a plurality of solid state light sources for illuminating the reference color chart, each solid state light source providing visible light at a preselected intensity;

a camera capturing at least one image of the reference color chart for transmission to a display screen;

a display screen for displaying the image of the reference color chart, the image exhibiting a second spectral response; and

an adjuster configured to adjust the displayed image responsive to a difference between the first spectral response and the second spectral response.

14. The illumination system of claim 13, wherein each of the solid state light sources is a light emitting diode.

15. The illumination system of claim 14, wherein at least one light emitting diode is an organic light emitting diode.

16. The illumination system of claim 14, wherein at least one light emitting diode is an inorganic light emitting diode.

17. The system of claim 13, wherein the reference color chart exhibits a plurality of colors.

18. The system of claim 13, wherein the adjuster is coupled to the plurality of solid state light sources for adjusting an intensity of at least one of the solid state light sources.

19. The system of claim 13, wherein the adjuster is coupled to the display screen for adjusting an intensity of the display screen.

20. The system of claim 13, wherein the adjuster includes a sensor for measuring a spectrum of the image and a feedback circuit from the sensor to the display screen for adjusting an intensity of the image.

21. The system of claim 20, further comprising a comparator coupled to the sensor for comparing the first spectral response with the second spectral response.

22. The system of claim 20, wherein the display screen includes at least one light emitting diode and the feedback circuit is coupled to the at least one light emitting diode.

23. A method of adjusting illumination of a scene by a light source, the method comprising the steps of:

illuminating a color chart adjacent the scene, the color chart exhibiting a first spectral response with the light source;

capturing an image of the illuminated color chart;

displaying the image on a display screen, the displayed image exhibiting a second spectral response;

generating a signal responsive to a difference between the first and second spectral responses; and

adjusting the illumination of the scene by the light source responsive to the signal.

24. A method of adjusting a color image of a scene transmitted over a network, the method comprising the steps of:

illuminating a color chart adjacent the scene with a light source, the color chart exhibiting a first spectral response;

capturing an image of the illuminated color chart;

displaying the image on a display screen, the displayed image exhibiting a second spectral response;

generating a signal responsive to a difference between the first and second spectral responses; and

adjusting the displayed image responsive to the signal.