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High-quality Surface Reconstruction using Gaussian Surfels์—์„œ ์ฃผ์žฅํ•˜๊ธฐ๋กœ Gaussian๋“ค์˜ alpha blending process์—์„œ reconstructed๋˜๋Š” surface edge์— bias๊ฐ€ ์ƒ๊ฒจ, edge ๋ถ€๋ถ„์ด ๋‚ ์นด๋กญ์ง€ ์•Š๊ณ  ๋ถ€๋“œ๋Ÿฝ๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ๋ฌธ์ œ๊ฐ€ ๋ฐœ์ƒํ•œ๋‹ค๊ณ  ํ•ฉ๋‹ˆ๋‹ค.

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Modeling Sharp Surface Edges and Alpha Blending Bias

Alpha Blending ๊ณผ์ •

Alpha Blending์€ ์ปดํ“จํ„ฐ ๊ทธ๋ž˜ํ”ฝ์Šค์—์„œ ๋ฐ˜ํˆฌ๋ช…ํ•œ ๊ฐ์ฒด๋ฅผ ๋ Œ๋”๋งํ•  ๋•Œ ์‚ฌ์šฉํ•˜๋Š” ๊ธฐ๋ฒ•์ž…๋‹ˆ๋‹ค. ๊ฐ ํ”ฝ์…€์˜ ์ƒ‰์ƒ์„ ๊ณ„์‚ฐํ•  ๋•Œ ๋ถˆํˆฌ๋ช…๋„(alpha)๋ฅผ ๊ณ ๋ คํ•˜์—ฌ ์—ฌ๋Ÿฌ ์ƒ‰์ƒ์„ ํ˜ผํ•ฉ(blend)ํ•ฉ๋‹ˆ๋‹ค. ์ด ๊ณผ์ •์€ ๋ฐ˜ํˆฌ๋ช… ๊ฐ์ฒด์˜ ์ƒ‰์ƒ์ด ๋ฐฐ๊ฒฝ ์ƒ‰์ƒ๊ณผ ํ˜ผํ•ฉ๋˜์–ด ๋‚˜ํƒ€๋‚˜๋„๋ก ํ•ฉ๋‹ˆ๋‹ค.

Gaussian Points์™€ Surface Edge

Gaussian Points๋Š” ์ฃผ๋กœ ๊ฐ€์šฐ์‹œ์•ˆ ๋ถ„ํฌ๋ฅผ ๋”ฐ๋ฅด๋Š” ํฌ์ธํŠธ ํด๋ผ์šฐ๋“œ ๋ฐ์ดํ„ฐ๋ฅผ ์˜๋ฏธํ•ฉ๋‹ˆ๋‹ค. ์ด๋“ค์€ ๊ฐ์ฒด์˜ ํ‘œ๋ฉด์ด๋‚˜ ๊ณต๊ฐ„์˜ ์ƒ˜ํ”Œ๋ง ์ง€์ ์„ ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

Surface Edge๋Š” 3D ๊ฐ์ฒด์˜ ํ‘œ๋ฉด์—์„œ ๋‚ ์นด๋กญ๊ณ  ๋ถ„๋ช…ํ•œ ๊ฐ€์žฅ์ž๋ฆฌ ๋ถ€๋ถ„์„ ์˜๋ฏธํ•ฉ๋‹ˆ๋‹ค. ๋‚ ์นด๋กœ์šด ๊ฐ€์žฅ์ž๋ฆฌ๋Š” ํ‘œ๋ฉด์ด ๊ธ‰๊ฒฉํžˆ ๋ณ€ํ™”ํ•˜๋Š” ๋ถ€๋ถ„์œผ๋กœ, ์ด ๋ถ€๋ถ„์„ ์ •ํ™•ํ•˜๊ฒŒ ์žฌ๊ตฌ์„ฑํ•˜๋Š” ๊ฒƒ์ด ์ค‘์š”ํ•ฉ๋‹ˆ๋‹ค.

๋ฌธ์ œ ์„ค๋ช…

์•ŒํŒŒ ๋ธ”๋ Œ๋”ฉ ๊ณผ์ •์—์„œ ๋ฐœ์ƒํ•˜๋Š” ๋ฌธ์ œ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์Šต๋‹ˆ๋‹ค:

  1. Gaussian Points์˜ ์˜ํ–ฅ: ๊ฐ€์šฐ์‹œ์•ˆ ๋ถ„ํฌ๋ฅผ ๋”ฐ๋ฅด๋Š” ํฌ์ธํŠธ๋“ค์ด ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ๋‚˜ ๊ทธ ๊ทผ์ฒ˜์—์„œ ์ƒ˜ํ”Œ๋ง๋ฉ๋‹ˆ๋‹ค.
  2. Blending์˜ ๋ฒ”์œ„: ์•ŒํŒŒ ๋ธ”๋ Œ๋”ฉ ๊ณผ์ •์—์„œ๋Š” ์ด ํฌ์ธํŠธ๋“ค์˜ ์ƒ‰์ƒ ์ •๋ณด๋ฅผ ํ˜ผํ•ฉํ•ฉ๋‹ˆ๋‹ค. ์ด๋•Œ, ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ๋กœ๋ถ€ํ„ฐ ๋ฉ€๋ฆฌ ๋–จ์–ด์ง„ ํฌ์ธํŠธ๋“ค๋„ ํ˜ผํ•ฉ์— ํฌํ•จ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
  3. ํŽธํ–ฅ ๋ฐœ์ƒ: ๊ฐ€์žฅ์ž๋ฆฌ๋กœ๋ถ€ํ„ฐ ๋ฉ€๋ฆฌ ๋–จ์–ด์ง„ ํฌ์ธํŠธ๋“ค์ด ํ˜ผํ•ฉ ๊ณผ์ •์— ํฌํ•จ๋˜๋ฉด, ์‹ค์ œ ๋‚ ์นด๋กœ์šด ๊ฐ€์žฅ์ž๋ฆฌ๊ฐ€ ๋ถ€๋“œ๋Ÿฝ๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ํ˜„์ƒ์ด ๋ฐœ์ƒํ•ฉ๋‹ˆ๋‹ค. ์ด๋Š” ์›๋ž˜์˜ ๋‚ ์นด๋กœ์šด ๊ฐ€์žฅ์ž๋ฆฌ๊ฐ€ ์™œ๊ณก๋˜์–ด ๋‚˜ํƒ€๋‚˜๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.

์ด ๊ณผ์ •์„ ์š”์•ฝํ•˜๋ฉด, ๊ฐ€์šฐ์‹œ์•ˆ ๋ถ„ํฌ๋ฅผ ๋”ฐ๋ฅด๋Š” ํฌ์ธํŠธ๋“ค์ด ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ ์ฃผ๋ณ€์—์„œ ์ƒ˜ํ”Œ๋ง๋˜๊ณ , ์ด ํฌ์ธํŠธ๋“ค์ด ์•ŒํŒŒ ๋ธ”๋ Œ๋”ฉ ๊ณผ์ •์—์„œ ํ˜ผํ•ฉ๋  ๋•Œ ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ์— ํŽธํ–ฅ์ด ์ƒ๊ธธ ์ˆ˜ ์žˆ๋‹ค๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ฒฐ๊ณผ์ ์œผ๋กœ, ์›๋ž˜ ๋‚ ์นด๋กœ์›Œ์•ผ ํ•  ๊ฐ€์žฅ์ž๋ฆฌ๊ฐ€ ๋ถ€๋“œ๋Ÿฝ๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ๋ฌธ์ œ๊ฐ€ ๋ฐœ์ƒํ•ฉ๋‹ˆ๋‹ค.

  • ์ฆ‰, Gaussian์„ Alpha Blendingํ•˜๋Š” ๊ณผ์ •์—์„œ surface edge ๋ถ€๋ถ„์˜ ์ƒ‰์„ accumulateํ•˜๋Š” ๊ณผ์ •์—์„œ surface์—์„œ ๋ฉ€๋ฆฌ ๋–จ์–ด์ง„ Gaussian์˜ ์ƒ‰์ด alpha blending๊ณผ์ •์— ํฌํ•จ๋˜๋ฉด, surface edge ๋ถ€๋ถ„์ด blurํ•˜๊ฒŒ ์ƒ์„ฑ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
  • ์ด๋ฅผ ๊ทธ๋ฆผ์œผ๋กœ ๋‚˜ํƒ€๋‚ด๋ฉด ๋‹ค์Œ๊ณผ ๊ฐ™์ด ํ‘œํ˜„ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

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์š”์•ฝ

์•ŒํŒŒ ๋ธ”๋ Œ๋”ฉ ๊ณผ์ •์—์„œ ๊ฐ€์šฐ์‹œ์•ˆ ๋ถ„ํฌ๋ฅผ ๋”ฐ๋ฅด๋Š” ํฌ์ธํŠธ๋“ค์ด ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ๋กœ๋ถ€ํ„ฐ ๋ฉ€๋ฆฌ ๋–จ์–ด์ง„ ๊ฒฝ์šฐ์—๋„ ํ˜ผํ•ฉ์— ํฌํ•จ๋˜๋ฉด์„œ, ์žฌ๊ตฌ์„ฑ๋œ ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ๊ฐ€ ์›๋ž˜๋ณด๋‹ค ๋ถ€๋“œ๋Ÿฝ๊ฒŒ ๋‚˜ํƒ€๋‚˜๋Š” ํŽธํ–ฅ์ด ๋ฐœ์ƒํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์ด๋Š” ๋‚ ์นด๋กœ์šด ํ‘œ๋ฉด ๊ฐ€์žฅ์ž๋ฆฌ๋ฅผ ์ •ํ™•ํ•˜๊ฒŒ ์žฌ๊ตฌ์„ฑํ•˜๋Š” ๋ฐ ์žˆ์–ด์„œ ๋ฌธ์ œ๋ฅผ ์ผ์œผํ‚ฌ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

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