Antialiasing & Its different technique
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This document discusses different anti-aliasing techniques used in computer graphics to smooth jagged edges. It describes pixel, aliased and anti-aliased images. The main anti-aliasing techniques discussed are supersampling, area sampling, multi-sampling anti-aliasing (MSAA) and fast-approximate anti-aliasing (FXAA). Supersampling takes color samples inside each pixel to calculate an average color, while area sampling computes pixel color based on object overlap with the pixel area. MSAA balances quality and performance using color manipulation, and FXAA applies blurring to obscure jagged edges without large computing power requirements.
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Antialiasing & Its different technique
- 1. 1.Anti aliasing & Its different technique
- 2. Submitted to, Mst. Eshita Khatun Lecturer, Department of Computer Science & Engineering, Daffodil International University. 2
- 3. Hello! 1. Anwar Hasan Shuvo (151-15-5506) 2. Prosenjit Roy (151-15-4815) 3. Nobanul Hasan (151-15-5035) 4. Redwan Naeem Manik (151-15-5039) 5. Md.Arifur Rahman Roby (151-15-5109) 3
- 4. Pixel ◂ A pixel is the smallest unit of a digital image or graphic that can be displayed and represented on a digital display device. ◂ A pixel is represented by a dot or square on a computer monitor display screen. ◂ Example: 4
- 5. Aliased & Anti-aliased 5 Figure: Aliased Figure: Anti-Aliased ◂ It exhibits jagged or stair stepped lines. ◂ Antialiasing is a technique for diminishing jaggies - stairstep-like lines that should be smooth.
- 6. Anti Aliasing Techniques ◂ Supersampling or Post filtering ◂ Areasampling or Pre filtering 1. Unweighted 2. Weighted ◂ Filtering Techniques ◂ Pixel Phasing 6
- 7. Supersampling ◂ Each pixel is divided into 9 pixels. ◂ Different intensity level ◂ Color samples are taken at several instances inside the pixel (not just at the center as normal), and an average color value is calculated. 7 Figure: 1 Figure: 2
- 8. Areasampling ◂ Prefiltering methods treat a pixel as an area, and compute pixel color based on the overlap of the scene's objects with a pixel's area. ◂ These techniques compute the shades of gray based on how much of a pixel's area is covered by a object. 8
- 9. MSAA ◂ Standing for “multi-sampling anti-aliasing” ◂ Balances out quality and performance ◂ relies on color manipulation around geometric shapes to produce an effect of smoothness 9Figure: Example of MSAA
- 10. FXAA ◂ stands for “fast-approximate anti-aliasing” ◂ applies extensive blurring to obscure the jagged edges ◂ main advantage of this technique over conventional anti- aliasing is that it does not require large amounts of computing power ◂ processes: 1) Find all edges contained in the image 2) Smooth the edges 10
- 11. “ All problems in computer graphics can be solved with matrix inversion. -Jim Blinn 11
- 12. Credits Special thanks to all these awesome resources for free: ◂ Wikipedia ◂ Ques10 Meets Answer ◂ Youtube 12
- 13. 13 Thanks!