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허프만 압축 알고리즘 및 비교
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2018년 1학기 알고리즘 과목 발표자료 - 허프만 압축 알고리즘 및 기타 알고리즘 성능 비교
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허프만 압축 알고리즘 및 비교
1.
허프만 압축 알고리즘
및 기타 압축 알고리즘 성능비교 20120302 김우진 20130870 이건희
2.
목차 • 허프만 압축
개요 • 허프만 압축 알고리즘 • 허프만 압축 결과 • 기타 압축 알고리즘과의 성능 비교
3.
허프만 압축 개요 •
무손실 압축에 쓰이는 엔트로피 부호화의 일종 • 자료 압축의 가장 오래되고 기초적인 방법 중 하나 • 더 많이 쓰이는 문자일수록 비트의 수는 적어짐
4.
허프만 압축 알고리즘
5.
6.
7.
8.
9.
10.
허프만 압축 결과 •
Data 1. 일반적인 텍스트 – 압축효율 45.019%
11.
허프만 압축 결과 •
Data 1. 일반적인 텍스트 – 압축효율 40.293%
12.
허프만 압축 결과 •
Data 2. 특정 문자들로만 구성된 문서 – 압축효율 75.040%
13.
허프만 압축 결과 •
그 외의 테스트 케이스 적용 • 전반적으로 40~47% 정도의 효율을 보임. • 하지만 문자의 수가 적으면 적을 수록 압축 효율이 높아짐
14.
기타 압축 알고리즘과의
비교
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