METHOD AND APPARATUS FOR COLOR-PRESERVING SPECTRUM RESHAPE

• US 20170249755A1
• Filed: 02/24/2017
• Published: 08/31/2017
• Est. Priority Date: 02/27/2016
• Status: Active Grant

• Current Assignee: Focal Sharp Inc.
• Original Assignee: Focal Sharp Inc.
• Inventors: Shih, Kuang-Tsu
• Granted Patent: US 10,600,213 B2
• Time in Patent Office: Days
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 2380/08 Biomedical applications
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607

Abstract

A system include an light emitter to generate a primary light, a filter to filter the primary light to substantially remove a spectrum energy in a wavelength band, a display device to present visual content using the filtered primary light, and a processing device to receive a visual content, calculate, in view of the filtered primary light, a metamer of the visual content, and provide, to the display device, the metamer of the visual content to display in view of the filtered light.

Claims

1. A system, comprising:

an light emitter to generate a primary light;

a filter to filter the primary light to substantially remove a spectrum energy in a wavelength band;

a display device to present visual content using the filtered primary light; and

a processing device to;

receive a visual content;

calculate, in view of the filtered primary light, a metamer of the visual content; and

provide, to the display device, the metamer of the visual content to display in view of the filtered light.

2. The system of claim 1, wherein the filer is to substantially the spectrum energy in a wavelength band between 400 nanometer (nm) and 700 nm.

3. The system of claim 1, wherein the display device comprises at least one of a liquid crystal display (LCD) panel, a light-emitting diode display (LED) panel, or an organic light-emitting diode display (OLED) panel.

4. The system of claim 1, wherein the filter is to substantially remove the spectrum energy in the wavelength band and maximize a display gamut volume associated with the display device in view of the filtered primary light.

5. The system of claim 4, wherein to calculate the metamer, the processing device is further to:

determine, in view of the filtered primary light, whether a first pixel of the visual content is within the display gamut volume;

responsive to determining that the first pixel is outside the display gamut volume, identify a second pixel within the display gamut volume, wherein the second pixel comprises an identical hue value and an identical saturation value as the first pixel but a scaled lightness value of the first pixel; and

replace the first pixel with the second pixel.

6. The system of claim 5, wherein to calculate the metamer, the processing device is further to:

apply one of an edge-preserving filter or a low-pass filter to a scale factor map comprising a plurality of scale factors to generate a second scale factor; and

use the second scale factor to scale a lightness value of the first pixel.

7. The system of claim 1, wherein calculation of the metamer preserves a white point of the display device.

8. The system of claim 1, wherein the filter is further to substantially remove the spectrum energy in a second wavelength band.

9. A method comprising:

receiving, by a processing device, a visual content to be displayed on a display device;

filtering a primary light, emitted from a light source associated with the display device, to substantially remove a spectrum energy in a wavelength band;

calculating, in view of the filtered primary light, a metamer of the visual content; and

providing, to the display device, the metamer of the visual content to display in view of the filtered light.

10. The method of claim 9, wherein the filtering is to substantially the spectrum energy in a wavelength band between 400 nanometer (nm) and 700 nm.

11. The method of claim 9, wherein the display device comprises at least one of a liquid crystal display (LCD) panel, a light-emitting diode display (LED) panel, or an organic light-emitting diode display (OLED) panel.

12. The method of claim 9, wherein the filtering is to substantially remove the spectrum energy in the wavelength band and maximize a display gamut volume associated with the display device in view of the filtered primary light.

13. The method of claim 12, wherein the calculating the metamer further comprises:

determining, in view of the filtered primary light, whether a first pixel of the visual content is within the display gamut volume;

responsive to determining that the first pixel is outside the display gamut volume, identifying a second pixel within the display gamut volume, wherein the second pixel comprises an identical hue value and an identical saturation value as the first pixel but a scaled lightness value of the first pixel; and

replacing the first pixel with the second pixel.

14. The method of claim 13, the calculating the metamer further comprises:

applying one of an edge-preserving filter or a low-pass filter to a scale factor map comprising a plurality of scale factors to generate a second scale factor; and

using the second scale factor to scale a lightness value of the first pixel.

15. The method of claim 9, wherein calculation of the metamer preserves a white point of the display device.

16. A non-transitory machine-readable storage medium storing instructions which, when executed, cause a processing device to perform operations comprising:

receiving, by the processing device, a visual content to be displayed on a display device, wherein a primary light associated with the display device is filtered to substantially remove a spectrum energy in a wavelength band;

calculating, in view of the filtered primary light, a metamer of the visual content; and

providing, to the display device, the metamer of the visual content to display in view of the filtered light.

17. The non-transitory machine-readable storage medium of claim 16, wherein the primary light is filtered to substantially the spectrum energy in a wavelength band between 400 nanometer (nm) and 700 nm.

18. The non-transitory machine-readable storage medium of claim 16, wherein the display device comprises at least one of a liquid crystal display (LCD) panel, a light-emitting diode display (LED) panel, or an organic light-emitting diode display (OLED) panel.

19. The non-transitory machine-readable storage medium of claim 16, wherein the primary light is filtered to substantially remove the spectrum energy in the wavelength band and maximize a display gamut volume associated with the display device in view of the filtered primary light.

20. The non-transitory machine-readable storage medium of claim 19, wherein the calculating the metamer further comprises:

determining, in view of the filtered primary light, whether a first pixel of the visual content is within the display gamut volume;

responsive to determining that the first pixel is outside the display gamut volume, identifying a second pixel within the display gamut volume, wherein the second pixel comprises an identical hue value and an identical saturation value as the first pixel but a scaled lightness value of the first pixel; and

replacing the first pixel with the second pixel.