HIGH DYNAMIC RANGE, BACKWARDS-COMPATIBLE, DIGITAL CINEMA

• US 20120314944A1
• Filed: 05/10/2012
• Published: 12/13/2012
• Est. Priority Date: 06/13/2011
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: NINAN, AJIT, HULYALKAR, SAMIR
• Granted Patent: US 8,891,863 B2
• Time in Patent Office: Days
• US Class Current: 382/166
• CPC Class Codes: G06T 2207/20208 High dynamic range [HDR] image processing
• CPC Class Codes: G06T 5/40 using histogram techniques
• CPC Class Codes: H04N 19/33 in the spatial domain
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/647 using significance based coding, e.g. Embedded Zerotrees of Wavelets [EZW] or Set Partitioning in Hierarchical Trees [SPIHT]
• CPC Class Codes: H04N 19/85 using pre-processing or post-processing specially adapted for video compression
• CPC Class Codes: H04N 21/234327 by decomposing into layers, e.g. base layer and one or more enhancement layers
• CPC Class Codes: H04N 21/41415 involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk

Abstract

HDR images are coded and distributed. An initial HDR image is received. Processing the received HDR image creates a JPEG-2000 DCI-compliant coded baseline image and an HDR-enhancement image. The coded baseline image has one or more color components, each of which provide enhancement information that allows reconstruction of an instance of the initial HDR image using the baseline image and the HDR-enhancement images. A data packet is computed, which has a first and a second data set. The first data set relates to the baseline image color components, each of which has an application marker that relates to the HDR-enhancement images. The second data set relates to the HDR-enhancement image. The data packets are sent in a DCI-compliant bit stream.

Claims

1. A method, comprising:

receiving a high dynamic range (HDR) image;

processing the received HDR image, wherein (a) a coded baseline image that complies with the Digital Cinema Systems Specification of the Digital Cinema Initiative (DCI Systems Standard), and (b) one or more HDR-enhancement images are created from the received HDR image;

wherein the coded baseline image comprises one or more color components, wherein the coded baseline image and the one or more HDR-enhancement images each provide enhancement information to allow reconstruction of an instance of the received HDR image using the baseline image and the HDR-enhancement images;

computing a data packet, wherein the data packet comprises;

a first data set that relates to the one or more baseline image color components, each of which has an application marker that relates to the HDR-enhancement images; and

a second data set that relates to one of the HDR-enhancement images, wherein the HDR image is coded; and

sending the computed data packet in a bit stream that conforms to the DCI Systems Standard, wherein the HDR image is distributed.

2. The method of claim 1, wherein the HDR enhancement images comprise a coded ratio image.

3. The method of claim 1, wherein the HDR enhancement images comprise a first coded chroma residual image, and a second chroma residual image.

4. The method of claim 1 wherein the coded baseline image comprises a resolution of 2048×

1080 (2K).

5. The method as recited in claim 1 wherein the coded baseline image comprises a resolution of 4096×

2160 (4K).

6. The method of claim 1 wherein the coded baseline image comprises:

an X′

color component;

a Y′

color component; and

a Z′

color component.

7. The method of claim 6 wherein the baseline image color component data packets for the X′

component further comprise data that relates to the coded ratio image.

8. The method of claim 6 wherein the baseline image color component data packets that correspond to the Y′

component further comprise data that relates to the first coded chroma residual image.

9. The method of claim 6 wherein the baseline image color component data packets that correspond to the Z′

component further comprise data that relates to the second coded chroma residual image.

10. The method of claim 1, wherein the HDR-enhancement application marker comprises an application marker that conforms to a specification of the JPEG 2000 compressor/decompressor (codec) of the Joint Photographic Experts Group (JPEG).

12. An apparatus comprising a processor and configured to perform the methods recited in claim 1.

14. A computer-readable storage medium having stored thereon computer-executable instructions for executing a method in accordance with claim 1.

11. A method of decoding HDR images comprising:

receiving a plurality of data packets, wherein each packet comprises a first data set that relates to one or more color components of a baseline image that complies with Digital Cinema Systems Specification of DCI, each of which has an application marker that relates to an HDR enhancement image, and

a second data set that relates to one of the HDR-enhancement images;

decoding the first set of data wherein the baseline image is reconstructed;

decoding the second set of data wherein the HDR-enhancement images are reconstructed; and

combining the baseline image and the HDR-enhancement images wherein an HDR output image is generated.

13. An apparatus comprising a processor and configured to perform the methods recited in claim 11.

15. A computer-readable storage medium having stored thereon computer-executable instructions for executing a method in accordance with claim 11.