KR960028429A - Image Coding Device Using Wavelet Transform - Google Patents

Image Coding Device Using Wavelet Transform Download PDF

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Publication number
KR960028429A
KR960028429A KR1019940033829A KR19940033829A KR960028429A KR 960028429 A KR960028429 A KR 960028429A KR 1019940033829 A KR1019940033829 A KR 1019940033829A KR 19940033829 A KR19940033829 A KR 19940033829A KR 960028429 A KR960028429 A KR 960028429A
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South Korea
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signal
component
low frequency
edge
vertical
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KR1019940033829A
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Korean (ko)
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KR0170936B1 (en
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박기송
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배순훈
대우전자 주식회사
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/007—Transform coding, e.g. discrete cosine transform
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Discrete Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

본 발명은 고화질 영상 시스템에 있어서, 웨이브렛 변환을 이용한 영상 부호화장치에 관한 것으로, 이를 해결하기 위해 영상의 대각선신호 엣지성분(D)를 하이, 로우패스필터와 2:1 감축기에 의해 처리됨과 더불어 이 출력되는 대각선 엣지성분(DD, DH, DV, DL)중 고주파 성분이 존재할 수 있는 대각선신호 엣지(DD)만을 벡터 양자화(VQ)하기 위한 제1 웨이브렛변환기 : 영상의 수평신호의 엣지성분(H)를 하이, 로우패스필터와 2:1 감축기에 의해 처리되고, 이 출력되는 수평신호(HD, HH, HV, HL)중 고주파 성분이 존재할 수 있는 수평신호의 대각선 엣지성분(HD)과 수평신호의 수평성분(HH)를 벡터 양자화(VQ)하기 위한 제2웨이브렛변환기 : 영상의 수직신호의 엣지성분(V)를 하이, 로우 패스필터와 2:1 감축기에 의해 처리됨과 더불어 이 출력되는 수직신호(VD, VH, VV, VL)중 고주파 성분이 존재할 수 있는 수직신호 대각선 엣지성분(VD)과 수직신호의 수직성분(VV)를 벡터 양자화(VQ)하기 위한 제3웨이브렛변환기: 영상의 저주파(L)를 하이, 로우패스필터와 2:1 감축기에 의해 처리되고, 이 출력되는 저주파신호(LD, LH, LV, LL)중 저주파신호의 대각선 엣지성분(LD)과 저주파신호의 수평성분(LH), 저주파신호의 수직성분(LV)은 각각 벡터 양자화(VQ)하고, 상기 저주파신호의 저주파성분(LL)은 이산여현변환(DCT)하기 위한 제4웨이브렛변환기를 포함하도록 구성된다.The present invention relates to an image encoding apparatus using wavelet transform in a high definition image system. In order to solve the problem, the diagonal signal edge component (D) of the image is processed by a high, low pass filter and a 2: 1 reducer. A first wavelet converter for vector quantizing only the diagonal signal edge (DD) in which the high frequency components among the output diagonal edge components (DD, DH, DV, DL) may exist: Edge component of the horizontal signal of the image ( H) is processed by a high, low pass filter and a 2: 1 reducer, and the diagonal edge component (HD) of the horizontal signal (HD, HH, HV, HL) of the horizontal signal (HD) A second wavelet converter for vector quantizing the horizontal component (HH) of the signal, wherein the edge component (V) of the vertical signal of the image is processed by a high, low pass filter and a 2: 1 reducer Vertical signal (VD, VH, VV, VL) A third wavelet converter for vector quantizing a vertical signal diagonal edge component (VD) and a vertical component (VV) of a vertical signal in which a wave component may exist: converting a low frequency (L) of an image into a high and low pass filter. A diagonal edge component (LD) of the low frequency signal, a horizontal component (LH) of the low frequency signal, and a vertical component (LV) of the low frequency signal among the low frequency signals LD, LH, LV, and LL which are processed by a 2: 1 reducer. Are each vector quantized (VQ), and the low frequency component LL of the low frequency signal is configured to include a fourth wavelet transformer for discrete cosine transform (DCT).

Description

웨이브렛 변환을 이용한 영상 부호화장치Image Coding Device Using Wavelet Transform

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도 (가)(나)는 제2도를 구현하는 웨이브렛 변환기의 구성도, 제4도는 본 발명의 웨이브렛 변환을 이용한 영상 부호화장치도, 제5도는 제4도에 따른 원영상을 대역분할함을 나타낸 도면.FIG. 3A is a block diagram of a wavelet converter for implementing FIG. 2, FIG. 4 is an image encoding apparatus using wavelet transform of the present invention, and FIG. 5 is an original image according to FIG. A diagram illustrating band splitting.

Claims (1)

입력되는 원영상을 1차 웨이브릿 변환하여 얻어지는 대각선 엣지와, 수평엣지, 수직엣지, 저주파신호를 각각 출력하는 웨이브렛 변환을 이용한 영상 부호화장치에 있어서: 상기 영상의 대각선신호 엣지성분(D)를 하이, 로우패스필터와 2:1 감축기에 의해 처리됨과 더불어 이 출력되는 대각선 엣지성분(DD, DH, DV, DL) 중 고주파 성분이 존재할 수 있는 대각선 신호 엣지(DD)만을 벡터 양자화(VQ)하기 위한 제1웨이브렛변환기: 상기 영상의 수평신호의 엣지성분(H)를 하이, 로우패스필터와 2:1 감축기에 의해 처리되고, 이 출력되는 수평신호(HD, HH, HV, HL) 중 고주파 성분이 존재할 수 있는 수평신호의 대각선 엣지성분(HD)과 수평신호의 수평성분(HH)를 벡터 양자화(VQ)하기 위한 제2웨이브렛변환기: 상기 영상의 수직신호의 엣지성분(V)를 하이, 로우패스필터와 2:1 감축기에 의해 처리됨과 더불어 이 출력되는 수직신호(VD, VH, VV, VL)중 고주파 성분이 존재할 수 있는 수직신호 대각선 엣지성분(VD)과 수직신호의 수직성분(VV)를 벡터 양자화(VQ)하기 위한 제3웨이브렛변환기: 상기 영상의 저주파(L)를 하이, 로우패스필터와 2:1 감축기에 의해 처리되고, 이 출력되는 저주파신호(LD, LH, LV, LL)중 저주파신호의 대각선 엣지성분(LD)과 저주파신호의 수평성분(LH), 저주파신호의 수직성분(LV)은 각각 벡터 양자화(VQ)하고, 상기 저주파신호의 저주파성분(LL)은 이산여현변환기(DCT)하기 위한 제4웨이브렛변환기를 포함함을 특징으로 하는 웨이브렛 변환을 이용한 영상 부호화장치.A video encoding apparatus using a diagonal edge obtained by first wavelet transforming an input original image and a wavelet transform for outputting a horizontal edge, a vertical edge, and a low frequency signal, respectively: A diagonal signal edge component (D) of the image Vector quantization (VQ) of only the diagonal signal edge (DD), which is processed by the high and low pass filters and the 2: 1 reducer, and may have a high frequency component among the output diagonal edge components (DD, DH, DV, and DL). A first wavelet converter for processing: The edge component (H) of the horizontal signal of the image is processed by a high, low pass filter and a 2: 1 reducer, the high frequency of the output horizontal signal (HD, HH, HV, HL) A second wavelet converter for vector quantizing the diagonal edge component (HD) of the horizontal signal in which the component may exist and the horizontal component (HH) of the horizontal signal: high edge component (V) of the vertical signal of the image Low Pass Filter and 2: 1 Reduction In addition, the quantized (VQ) of the vertical signal diagonal edge component (VD) and the vertical component (VV) of the vertical signal, in which the high frequency components of the output vertical signals (VD, VH, VV, and VL) may exist. A third wavelet converter for processing: The low frequency (L) of the image is processed by a high, low pass filter and a 2: 1 reducer, the diagonal edge of the low frequency signal of the low frequency signals (LD, LH, LV, LL) outputted The component LD, the horizontal component LH of the low frequency signal, and the vertical component LV of the low frequency signal are each vector quantized (VQ), and the low frequency component LL of the low frequency signal is a discrete cosine converter (DCT). An image encoding apparatus using a wavelet transform, characterized in that it comprises a four-wavelet transformer. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940033829A 1994-12-13 1994-12-13 Image coding apparatus using wavelet transform KR0170936B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100395614B1 (en) * 2000-09-27 2003-08-21 웹게이트 주식회사 Two dimensional discrete wavelet transformation apparatus
WO2006080665A1 (en) * 2004-10-21 2006-08-03 Samsung Electronics Co., Ltd. Video coding method and apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000060518A (en) * 1999-03-16 2000-10-16 구자홍 Image compressing method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100395614B1 (en) * 2000-09-27 2003-08-21 웹게이트 주식회사 Two dimensional discrete wavelet transformation apparatus
WO2006080665A1 (en) * 2004-10-21 2006-08-03 Samsung Electronics Co., Ltd. Video coding method and apparatus

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