이미지 Whitening 전처리

  • 데이터를 고유값(의 제곱근)으로 나누어 정규화 시키는 방법
  • 데이터의 분포를 고르게 깨끗하게 만드는것으로 이해하면 된다.
  • 아래의 프로세스
    • 1) 평균차감을 통해 평균을 0으로 만들고
    • 2) PCA를 통해 데이터간 상관관계를 없애고
    • 3) Whitening을 통해 분산을 1로 만든다.
  • 보통은 예측력이 미세하게나마 좋아진다.

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