Perceptual luminance nonlinearity-based image data exchange across different display capabilities

• US 10,621,952 B2
• Filed: 03/14/2019
• Issued: 04/14/2020
• Est. Priority Date: 12/06/2011
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Miller, Jon Scott, Daly, Scott, Nezamabadi, Mahdi, Atkins, Robin
• Primary Examiner(s): Moyer, Andrew M
• Application Number:
  US16/354,106
• Publication Number:
  US 20190304401A1
• Time in Patent Office: 397 Days
• Field of Search: 382235
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/04 Maintaining the quality of display appearance
• CPC Class Codes: G09G 2340/0428 Gradation resolution change
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2340/14 Solving problems related to the presentation of information to be displayed
• 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 2370/08 Details of image data interface between the display device controller and the data line driver circuit
• CPC Class Codes: G09G 2380/08 Biomedical applications
• CPC Class Codes: G09G 5/005 Adapting incoming signals to the display format of the display terminal
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: H04N 19/40 using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream

Abstract

A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is configured to access a code mapping between the reference code values and device-specific code values of the imaging device. The device-specific code values are configured to produce gray levels that are specific to the imaging device. Based on the code mapping, the data converter is configured to transcode the reference encoded image data into device-specific image data, which is encoded with the device-specific code values.

Claims

1. An apparatus processing a bitstream stored on a non-transitory storage media, the bitstream comprising an image and metadata, wherein:

the metadata includes a first luminance value and a second luminance value;

the image is encoded with digital code values D that represent a normalized luminance Y based at least in part on a functional model of

2. The apparatus of claim 1, wherein a relationship between the normalized value V and the digital code value D is provided by the function:

3. The apparatus of claim 2, wherein the bit depth b is 10 bits.

4. The apparatus of claim 2, wherein the bit depth b is 12 bits.

5. The apparatus of claim 1, wherein: