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docs: remove references header from EEi metric documentation

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Sam Chau
2025-01-24 12:31:18 +10:30
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@@ -183,7 +183,5 @@ These examples demonstrate how different groups excel at different target ratios
| Why does transparency require 60% at 2160p compared to 40% at 1080p? | The higher ratio requirement for 2160p content stems from several technical factors that compound to demand more data for achieving transparency:<br><br>1. **Increased Color Depth**: Most 2160p content uses 10-bit color depth compared to 8-bit for standard 1080p content. This 25% increase in bit depth requires more data to maintain precision in color gradients and prevent banding.<br><br>2. **HDR Requirements**: 2160p content often includes HDR metadata, which demands more precise encoding of brightness levels and color information. The expanded dynamic range means we need to preserve more subtle variations in both very bright and very dark scenes.<br><br>3. **Resolution Scaling**: While 2160p has 4x the pixels of 1080p, compression efficiency doesn't scale linearly. Higher resolution reveals more subtle details and film grain, which require more data to preserve accurately.<br><br>These factors combine multiplicatively rather than additively, which is why we need a 50% increase in the compression ratio ceiling (from 40% to 60%) to achieve similar perceptual transparency. |
| Do all 2160p releases need 60% for transparency? | No, the actual requirements vary significantly based on several factors:<br><br>1. **Content Type**:<br>- Animation might achieve transparency at 30-40%<br>- Digital source material (like CGI-heavy films) often requires less<br>- Film-based content with heavy grain needs the full 60%<br><br>2. **HDR Implementation**:<br>- SDR 2160p content can often achieve transparency at lower ratios<br>- Dolby Vision adds additional overhead compared to HDR10<br>- Some HDR grades are more demanding than others<br><br>3. **Source Quality**:<br>- Digital intermediate resolution (2K vs 4K)<br>- Film scan quality and grain structure<br>- Original master's bit depth and color space<br><br>4. **Scene Complexity**:<br>- High motion scenes need more data<br>- Complex textures and patterns require higher bitrates<br>- Dark scenes with subtle gradients are particularly demanding |
## References
[^1]: Shen, Y. (2020). "Bjontegaard Delta Rate Metric". Medium Innovation Labs Blog. https://medium.com/innovation-labs-blog/bjontegaard-delta-rate-metric-c8c82c1bc42c
[^2]: Ling, N.; Antier, M.; Liu, Y.; Yang, X.; Li, Z. (2024). "Video Quality Assessment: From FR to NR". Electronics, 13(5), 953. https://www.mdpi.com/2079-9292/13/5/953