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graph cut optimization 1

[ ์˜๋ฃŒ์˜์ƒ ] Medical Image Segmentation (5.Graph Cut Optimization)

MOOC ๊ฐ•์ขŒ '์ปดํ“จํ„ฐ๋น„์ „, ๋จธ์‹ ๋Ÿฌ๋‹, ๋”ฅ๋Ÿฌ๋‹์„ ์ด์šฉํ•œ ์˜๋ฃŒ์˜์ƒ๋ถ„์„' ๊ฐ•์˜๋ฅผ ๋ฆฌ๋ทฐ ๋ฐ ์ •๋ฆฌํ•œ ๊ฒŒ์‹œ๋ฌผ์ž…๋‹ˆ๋‹ค. Graph Model์„ ์–ด๋–ป๊ฒŒ ์ •์˜ํ•˜๊ณ , ์ •์˜๋œ Model๋กœ๋ถ€ํ„ฐ ์–ด๋–ป๊ฒŒ ์ตœ์ ํ™”๋ฅผ ํ•ด์„œ Label์„ ์–ป๋Š”์ง€์— ๊ด€ํ•œ ์ด์•ผ๊ธฐ๋‹ค. ๊ทธ์ „์— ๋ฆฌ๋ทฐ๋ฅผ ํ•ด๋ณด์ž. ์œ„ ๊ทธ๋ฆผ์ฒ˜๋Ÿผ ๋…ธ๋“œ๊ฐ€ N=9์ผ ๋•Œ๋Š” ๊ฐ๊ฐ ํ™•๋ฅ ์„ ๊ตฌํ•ด์„œ ๊ณฑํ•ด์ฃผ๋ฉด ์‰ฝ์ง€๋งŒ 100x100 ์ด๋ฏธ์ง€๋งŒ ์ƒ๊ฐํ•ด๋ด๋„ ๋…ธ๋“œ๊ฐ€ N=10,000์ด ๋˜๊ณ , 0 ~ 1 ์‚ฌ์ด์˜ ํ™•๋ฅ ๊ฐ’์„ 10,000๋ฒˆ ๊ณฑํ•˜๋ฉด 0์— ๊ฐ€๊นŒ์šด ๊ฐ’์ด ๊ทธ ๊ฒฐ๊ณผ๋กœ ๋„์ถœ๋  ๊ฒƒ์ด๋‹ค. ์ด๋Ÿฌํ•œ ๊ฒฝ์šฐ๊ฐ€ ๋ฐœ์ƒํ•˜๋Š” ๊ฒƒ์„ ์˜ˆ๋ฐฉํ•˜๊ธฐ ์œ„ํ•ด Likelihood Probability์™€ Prior Probability์˜ ๊ณฑ์— - log ๋ฅผ ์”Œ์›Œ์ค€๋‹ค. log ์„ฑ์งˆ์„ ์ด์šฉํ•˜๋ฉด ์ง„์ˆ˜์˜ ๊ณฑ์€ ๋กœ๊ทธ์˜ ๋ง์…ˆ์œผ๋กœ ๋‚˜๋ˆ„์–ด์ง€๊ณ , ๊ฒฐ๊ตญ ๋‘ Pro..

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