smaa 테크닉에 대한 ppt

1. SMAA
Enhanced Subpixel Morphological Antialiasing
엔씨소프트
이재윤
http://cafe.naver.com/shader

2. |Abstract
• Image-based post-processing AA technique
– 좋은 edge detection
– Simple and effective way to handle sharpness
• Geometric features
• Diagonal lines
• Works with MSAA / SSAA
• CryEngine3에 적용
http://cafe.naver.com/shader

3. |Introduction
• CG에서의 숙원사업 anti-aliasing
– Spatial domain
– Temporal domain
• MSAA/SSAA
– 이제는 진부한 퀄리티와 (메모리+속도)의 trade-off
• MLAA에서 착안
– Practical MLAA의 모든 step을 rebuilding
http://cafe.naver.com/shader

4. |Previous MLAA
Original Edges Blending Antialiased
Image texture weights texture Image
http://cafe.naver.com/shader

5. |SMAA
• Edge detection
– Local contrast adaptation
• Pattern handling
– Sharp geometric features
– Diagonal patterns
– Accurate distances search
• Sub-pixel rendering
• Temporal re-projection
http://cafe.naver.com/shader

6. |Edge detection
• Luminance 사용
– RGB 보다 빠름
– Shading aliasing에도 적용 가능
• Top Right edge에 대해서만 검출
http://cafe.naver.com/shader

7. |Edge detection
Crossing edges Using Local contrast SMAA
http://cafe.naver.com/shader

8. |Edge detection
http://cafe.naver.com/shader

9. |Pattern handling
• Sharp geometric features
No AA MLAA SMAA
http://cafe.naver.com/shader

10. |Pattern handling
• Sharp geometric features
http://cafe.naver.com/shader

11. |Pattern handling
• Sharp geometric features
http://cafe.naver.com/shader

12. |Pattern handling
• Diagonal patterns
– 기존의 filter-based techniques
• Orthogonal pattern에 대해서만 고려
• 대각선에 대해 좋지 않은 aliased 결과
http://cafe.naver.com/shader

13. |Pattern handling
• Diagonal patterns
MLAA SMAA
http://cafe.naver.com/shader

14. |Pattern handling
• Diagonal patterns
Pattern map Area texture
http://cafe.naver.com/shader

15. |Pattern handling
• Accurate distances search
– 정확한 edge dist.를 찾는 것이 key point
http://cafe.naver.com/shader

16. |Sub-pixel rendering
MLAA SMAA + @
Single sample / pixel More samples / pixel
http://cafe.naver.com/shader

17. |Sub-pixel rendering
http://cafe.naver.com/shader

18. |Temporal Re-projection
• TSSAA
– sub-pixel rendering에 효과적
– But, ghosting artifact 존재
• Prev. frame re-projection
http://cafe.naver.com/shader

19. |Temporal re-projection
TSSAA Re-projection Velocity weighting
http://cafe.naver.com/shader

20. |Temporal re-projection
TSSAA Re-projection Velocity weighting
http://cafe.naver.com/shader

21. |Results
• NVIDIA GeForce GTX 470
• 1080p Images
techniques Execution times
SMAA 1x 1.02ms
SMAA T2x 1.32ms
SMAA S2x 2.04ms
SMAA 4x 2.34ms
http://cafe.naver.com/shader

22. |Conclusions
• Tackles all the weak points remaining in filter-
based antialiasing solutions
• Shown how to combine a filter-based AA with
MSAA/SSAA
http://cafe.naver.com/shader