Systems, apparatus and methods for mapping between video ranges of image data and a display

• US 10,194,127 B2
• Filed: 02/29/2016
• Issued: 01/29/2019
• Est. Priority Date: 07/22/2010
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Atkins, Robin
• Primary Examiner(s): Nguyen, Vu
• Application Number:
  US15/056,347
• Publication Number:
  US 20160212397A1
• Time in Patent Office: 1,065 Days
• Field of Search: None
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2352/00 Parallel handling of streams of display data
• CPC Class Codes: G09G 5/005 Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: H04N 5/20 Circuitry for controlling amplitude response
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85
• CPC Class Codes: H04N 9/77 Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase circuits for matrixing H04N9/67

Abstract

Systems, apparatus and methods are provided to map a video range of image data to the video range of a display. Embodiments apply a weighted combination of values in input image data streams to generate image data having a range which matches the display capabilities. The weighted combination may be determined based on relative capabilities of the display and input image data. The video range of the image data and display may be a range of colors (gamut) and/or luminance (dynamic range).

Claims

1. In a display system, a method for displaying video data on a display, said method including:

receiving information indicative of a first range of video data said display is capable of displaying;

providing, to an upstream device, information indicative of a second range of video data, said second range of video data being greater than said display is capable of displaying, thereby preventing said upstream device from converting video data of said second range to video data of said first range;

receiving said video data of said second range;

mapping said received video data of said second range to produce mapped video data of said first range; and

displaying said mapped video data of said first range.

2. The method of claim 1, wherein said video data of said second range is capable of defining a larger color gamut than said video data of said first range.

3. The method of claim 1, wherein said video data of said second range is capable of defining a higher dynamic range than said video data of said first range.

4. The method of claim 3, wherein said video data of said second range is capable of defining a larger color gamut than said video data of said first range.

5. The method of claim 1, further comprising:

receiving encoded video data;

receiving information indicative of a third range of said encoded video data;

decoding said encoded video data to generate decoded video data of said third range;

mapping said decoded video data of said third range to said video data of said second range based on said provided information indicative of said second range of data.

6. The method of claim 5, wherein said information indicative of said third range of said-encoded video data includes metadata embedded in a stream of said encoded video data.

7. The method of claim 5, wherein said third range of said video data is the same as said second range of said video data.

8. The method of claim 5, wherein said third range of said video data is higher than said second range of said video data.

9. A display system comprising:

a display;

a source of information indicative of a first range of video data said display is capable of displaying;

an output coupled to provide information indicative of a second range of video data to an upstream device, said second range of data being greater than said display is capable of displaying, thereby preventing said upstream device from converting video data of said second range to video data of said first range;

an input operative to receive said video data of said second range; and

a mapper operative to map said received video data of said second range to produce mapped video data of said first range and to provide said mapped video data of said first range to said display.

10. The display system of claim 9, wherein said video data of said second range is capable of defining a larger color gamut than said video data of said first range.

11. The display system of claim 9, wherein said video data of said second range is capable of defining a higher dynamic range than said video data of said first range.

12. The display system of claim 11, wherein said video data of said second range is capable of defining a larger color gamut than said video data of said first range.

13. The display system of claim 9, further comprising:

a second input operative to receive encoded video data and information indicative of a third range of said encoded video data;

a decoder coupled to said second input and operative to decode said encoded video data to generate decoded video data of said third range; and

a second mapper operative to map said decoded video data of said third range to said video data of said second range based on said provided information indicative of said second range of video data.

14. The display system of claim 13, wherein said information indicative of said third range of said encoded video data includes metadata embedded in a stream of said encoded video data.

15. The display system of claim 13, wherein said third range of said video data is the same as said second range of said video data.

16. The display system of claim 13, wherein said third range of said video data is higher than said second range of said video data.

17. The display system of claim 13, wherein:

said display and said mapper are housed in a first component; and

said decoder and said second mapper are housed in a separate second component.

18. The display system of claim 17, wherein responsive to communication from said first component said second component provides said decoded video data to said first component without mapping by said second mapper.

19. A display system comprising:

a display capable of displaying video data of a first range;

means of requesting video data of a second range from a separate video processing device, said second range of data being greater than said display is capable of displaying, thereby preventing said video processing device from converting said video data of said second range to said video data of said first range;

an input operative to receive said video data of said second range from said video processing device; and

a mapper operative to map said received video data of said second range to produce mapped video data of said first range and to provide said mapped video data of said first range to said display.