영상압축

머스트에서는 디지털영상 압축을 위해 주파수 도메인에서의 압축, 고유값,고유벡터를 이용한 압축, PNG영상 구조의 특성을 활용한 압축에 대해 깊이 있는 연구 성과를 바탕으로 프로젝트에 적용 하고 있습니다.

Fourier Transform

  • Translation property results in a phase shift of the spectrum.
    1. a
      (a)
    2. b
      (b)
    3. c
      (c)
    4. d
      (d)
    5. e
      (e)
    6. f
      (f)
    7. g
      (g)
    8. h
      (h)
    9. i
      (i)

(a) Original image. (b) The magnitude of the Fourier spectrum from (a) represented as an image. (c) The phase of the Fourier spectrum from (a) represented by an image. (d) and (g) are original image shifted by 128 rows and 128 columns, and 64 rows and 64 columns, respectively. (e), (h) The magnitude spectrum. (f), (i) Phase spectrum. These images illustrate that when an image is translated, the phase changes, even though magnitude remains the same.

Karhunen Loeve(KL) Transform

  • Principal component transform of multiband image
    1. a
      (a)
    2. b
      (b)
    3. c
      (c)
    4. d
      (d)
    5. e
      (e)
    6. f
      (f)

Principal components transform. (a) Red band of a color image. (b) Green band. (c) Blue band. (d) Principal component band 1. (e) Principal component band 2. (f) Principal component band 3. Note that the red, green, and blue bands are highly correlated – they look similar ; whereas with the PCT bands most the visual information is in band 1, some in band 2 and none in band 3. This is what it means when we say that the PCT decorrelates the data and puts most of the information into the principal component band.

적용사례

  • PNG 이미지 생성 및 압축

    MWSF를 사용하는 모든 웹사이트 : 봉화군청 등

  • 영상의 자동 압축

    MWSF를 사용하는 모든 웹사이트

  • 영상의 복원

    MWSF를 사용하는 모든 웹사이트

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