Abstract
Methods for the efficient coding of high-dynamic range (HDR) still-images and video sequences are reviewed. In dual-layer techniques, a base layer of standard-dynamic range data is enhanced by additional image data in an enhancement layer. The enhancement layer may be additive or multiplicative. If there is no requirement for backward compatibility, adaptive HDR-to-standard dynamic range (SDR) mapping schemes in the encoder allow for improved coding efficiency versus the backward-compatible schemes. In single-layer techniques, a base layer is complemented by metadata, such as supplementary enhancement information (SEI) data or color remapping information (CRI) data, which allow a decoder to apply special “reshaping” or inverse-mapping functions to the base layer to reconstruct an approximation of the original HDR signal. New standards for exchanging HDR signals, such as SMPTE 2084 and BT. 2100, define new mapping functions for translating linear scene light captured by a camera to video and are replacing the traditional “gamma” mapping. The effect of those transforms to existing coding standards, such as high efficiency video coding (HEVC) and beyond, are reviewed, and novel quantization and coding schemes that take these new mapping functions into consideration are also presented.
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Notes
- 1.
Candela per square meter (cd/m2), also referred to as nit, is the international standard unit of luminance.
- 2.
“Tone mapping” refers to the process of mapping luminance values in a high dynamic range to luminance values in a lower dynamic range.
- 3.
WCG stands for wide color gamut, referring to any color gamut larger than the color gamut supported by the original analog television systems and CRTs. For example, Rec. BT. 2020 [51] defines a WCG container for ultra-high-definition TVs.
- 4.
BDVM stands for Blu-Ray Disc Movie.
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Appendix: List of Abbreviations
Appendix: List of Abbreviations
- AVC:
-
Advanced Video coding
- BDVM HDR:
-
Blu-ray Disc Movie HDR
- BL:
-
Base Layer
- CAQ:
-
Content Adaptive Quantization
- CfE:
-
Call for Evidence
- CRI:
-
Color Remapping Information
- CRT:
-
Cathode Ray Tube
- EL:
-
Enhancement Layer
- EOTF:
-
Electro-Optical Transfer Function
- HDR:
-
High Dynamic Range
- HDR ETM HDR:
-
Exploratory Test Model
- HDTV:
-
High Definition Television
- HEVC:
-
High Efficiency Video Coding
- HLG:
-
Hybrid Log-Gamma
- HVS:
-
Human Visual System
- ITU:
-
International Telecommunication Union
- JPEG:
-
Joint Photographic Experts Group
- LDR:
-
Lower Dynamic Range
- LSB:
-
Least Significant Bit
- LUT:
-
Look-up Table
- MMR:
-
Multivariate Multiple Regression
- MPEG:
-
Moving Picture Experts Group
- MSB:
-
Most Significant Bit
- MSE:
-
Mean-Squared Error
- NLQ:
-
Non-Linear Quantizer
- OETF:
-
Opto-Electrical Transfer Function
- OOTF:
-
Opto-Optical Transfer Function
- PQ:
-
Perceptual Quantizer
- PSNR:
-
Peak Signal-to-Noise Ratio
- QP:
-
Quantization Parameter
- RD:
-
Rate-Distortion
- ROI:
-
Region of Interest
- SDI:
-
Serial Digital Interface
- SDR:
-
Standard Dynamic Range
- SEI:
-
Supplementary Enhancement Information
- SMPTE:
-
Society of Motion Picture and Television Engineers
- TIFF:
-
Tagged Image File Format
- UHD:
-
Ultra-high-definition
- VDP:
-
Visual Difference Predictor
- VQM:
-
Video Quality Measure
- WCG:
-
Wide Color Gamut
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Konstantinides, K., Su, GM., Gadgil, N. (2019). High Dynamic Range Video Coding. In: Bhattacharyya, S., Deprettere, E., Leupers, R., Takala, J. (eds) Handbook of Signal Processing Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-91734-4_5
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