Display management methods and apparatus

• US 10,056,055 B2
• Filed: 02/18/2011
• Issued: 08/21/2018
• Est. Priority Date: 02/24/2010
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Seetzen, Helge, Atkins, Robin, Messmer, Neil W., Damberg, Gerwin
• Primary Examiner(s): Richer, Aaron M
• Application Number:
  US13/580,776
• Publication Number:
  US 20130038790A1
• Time in Patent Office: 2,741 Days
• Field of Search: None
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/0485 Centering horizontally or vertically
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2340/10 Mixing of images, i.e. displayed pixel being the result of an operation, e.g. adding, on the corresponding input pixels
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2370/04 Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
• 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
• CPC Class Codes: H04N 9/67 for matrixing camera processing pipelines for matrixing of colour signals H04N23/85

Abstract

Apparatus and methods for mapping video signal parameters such as tone and color may be applied at various points in a video generation and delivery pipeline. apparatus may be configured to control mappings based on a range of inputs which may include one or more of: ambient conditions, user inputs, control information, adaptation models. Apparatus and methods may be applied to display video or other images so as to preserve a creative intent embodied in video or other image data.

Claims

1. A method for providing video signals for display on a target display, the method comprising:

receiving a first input video signal having a first format wherein a video parameter is represented within a first range;

receiving a second input video signal having a second format wherein the video parameter is represented within a second range different from the first range, the first and second input video signals comprising different versions of the same video content;

determining a target range of the target display;

generating a target value for the video parameter by extrapolating or interpolating the target value from first and second values of the video parameter in the first and second input video signals respectively, the interpolation from the first and second values of the parameter based on the first range, the second range, and the target range; and

outputting the target value to the target display;

wherein;

one of the first and the second range is a range greater than a corresponding range of the target display; and

the extrapolating or interpolating comprises a multi-range process including two or more of an unaltered range, a compressed range and a clipped range.

2. A method according to claim 1 wherein the video parameter comprises a tone or color value.

3. A method according to claim 2 comprising performing the extrapolating or interpolating for the tone or color value for pixels of a video frame.

4. A method according to claim 3 wherein for at least some of the pixels a value of the parameter is the same in the first and second input video signals.

5. A method according to claim 4 wherein the interpolation or extrapolation is performed on-the-fly for values of the video parameter specified for pixels in the first and second input video signals.

6. A method according to claim 4 wherein one of the first and second input video signals comprises a Rec. 709 video signal.

7. A method according to claim 4 wherein one of the first and second ranges covers the full range of parameter values perceptible by the human visual system.

8. A method according to claim 1 wherein the interpolation or extrapolation is performed in a perceptually linear color space.

9. A method according to claim 8 wherein the perceptually linear color space comprises an IPT, Log Yxy or Log Yu′

v′

color space.

10. A method according to claim 9 wherein the interpolation or extrapolation comprises tone mapping and the tone mapping comprises determining a weighted sum of logarithms of tone values from the first and second video signals.

11. A method according to claim 10 wherein, in the tone mapping, the weighted sum is determined using a weighting factor based on a difference between a maximum of the target range and a maximum of one of the first and second ranges.

12. A method according to claim 1 comprising, determining whether a capability of the target display matches a capability associated with one of the first input video signal and the second input video signal and, if so, passing the matching one of the first and second input video signals to the target display.