Smaa : enhanced morphological anti-aliasing

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
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4. | Previous MLAA
Original
Image
Edges
texture
Blending
weights texture
Antialiased
Image
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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

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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
No AA MLAA SMAA
•Sharp geometric features
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10. | Pattern handling
•Sharp geometric features
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11. | Pattern handling
•Sharp geometric features
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12. | Pattern handling
•Diagonal patterns
–기존의 filter-based techniques
•Orthogonal pattern에 대해서만 고려
•대각선에 대해 좋지 않은 aliased 결과

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

14. | Pattern handling
•Diagonal patterns
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Pattern map Area texture

15. | Pattern handling
•Accurate distances search
–정확한 edge dist.를 찾는 것이 key point

http://cafe.naver.com/shader

16. | Sub-pixel rendering
MLAA
Single sample / pixel

http://cafe.naver.com/shader
SMAA + @
More samples / pixel

17. | Sub-pixel rendering

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18. | Temporal Re-projection
•TSSAA
–sub-pixel rendering에 효과적
–But, ghosting artifact 존재
•Prev. frame re-projection


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

20. | Temporal re-projection
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TSSAA Re-projection Velocity weighting

21. | Results
•NVIDIA GeForce GTX 470
•1080p Images

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techniques Execution times
SMAA 1x 1.02ms
SMAA T2x 1.32ms
SMAA S2x 2.04ms
SMAA 4x 2.34ms

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