KR960040022A - Image Coding Device Using Wavelet Transform - Google Patents

Image Coding Device Using Wavelet Transform Download PDF

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Publication number
KR960040022A
KR960040022A KR1019950010596A KR19950010596A KR960040022A KR 960040022 A KR960040022 A KR 960040022A KR 1019950010596 A KR1019950010596 A KR 1019950010596A KR 19950010596 A KR19950010596 A KR 19950010596A KR 960040022 A KR960040022 A KR 960040022A
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South Korea
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region
component
edge
low frequency
vector
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KR1019950010596A
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Korean (ko)
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KR0171119B1 (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 웨이블렛 변환을 이용한 영상 부호화장치에 관한 것으로, 고주파의 대각선 엣지성분 즉, D영역을 가변블럭 부호화하여 벡터 양자화하는 제1영상 신호처리부(510)와, 고주파의 수평신호 엣지 성분, 즉 H영역을 가변 블럭 부호화하여 벡터 양자화하는 제2영상 신호 처리부(520)와, 고주파의 수직 신호 엣지 성분, 즉, V영역을 가변블럭 부호화하여 벡터 양자화하는 제3영상 신호 처리부(530)와, 저주파의 대각선 엣지 성분, 즉, LD영역, 저주파의 수평 신호 엣지 성분, 즉, LH 영역, 및 저주파의 수직 신호 엣지 성분, 즉, LV 영역은 가변 블럭 부호화하여 벡터 양자화 하고, 엣지 성분이 없는 저주파 성분, 즉, LL영역은 이산 여현 변환(DCT)하는 제4영상 신호 처리부(540)를 포함하고 구성되어, 엣지(edge)부분의 열화 현상을 방지하고 저주파 성분에 작은 비트를 할당하여 보다 효율적으로 영상 압축을 할 수 있도록 한 것이다.The present invention relates to an image encoding apparatus using wavelet transform, comprising: a first image signal processing unit (510) for variable quantizing a diagonal block component of high frequency, that is, D region, and vector quantization, and a horizontal signal edge component of high frequency, that is, H A second image signal processor 520 for vector quantizing the region by variable block coding, a third image signal processor 530 for vector quantizing the vertical signal edge component of a high frequency, that is, a V region, and a low frequency The diagonal edge components, that is, the LD region, the low frequency horizontal signal edge components, that is, the LH region, and the low frequency vertical signal edge components, that is, the LV region, are vector-quantized by variable block coding, and the low frequency components without edge components, namely, The LL region includes a fourth image signal processor 540 which performs discrete cosine transform (DCT) to prevent deterioration of the edge portion and to apply small bits to low frequency components. In this case, the video compression can be performed more efficiently.

Description

웨이브렛 변환을 이용한 영상 부호화 장치Image Coding Device Using Wavelet Transform

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제5도는 본 발명에 따른 웨이브렛 변환을 이용한 부호화 장치의 블럭도, 제6도는 제5도의 본 발명에 따른 웨이블렛 변환을 이용한 영상 부호화 장치에 의해서 가변 블럭으로 분할된 원영상을 나타낸 도면.5 is a block diagram of an encoding apparatus using wavelet transform according to the present invention, and FIG. 6 is a view showing an original image divided into variable blocks by the image encoding apparatus using wavelet transform according to the present invention of FIG.

Claims (2)

입력되는 원영상을 1차 웨이브렛 변환하여 얻어지는 고주파의 대각선 엣지(D)와, 수평 신호 엣지(H), 수직 신호 엣지(V), 저주파 신호(L)를 각각 출력하는 웨이브렛 변환을 이용한 영상 부호화 장치에 있어서, 상기 고주파의 대각선 에지 성분 영역(D)에서 외곽선을 검출하여 가변 블럭 부호화한 후 벡터 양자화하기 위한 제1영상 신호처리수단 (510)과 ; 상기 고주파의 수평 신호 엣지 성분 영역(H)에서 외곽선 성분을 검출하여 가변 블럭 부호화한 후 벡터 양자화하기 위한 제2영상 신호 처리 수단(520)과 ; 상기 고주파의 수직신호 엣지 성분 영역(V)에서 외곽선 성분을 검출하여 가변 블럭 부호화한 후 벡터 양자화하기 위한 제3영상 신호 처리 수단(530)과 ; 상기 저주파 신호 영역(L)중에서 저주파의 대각선 엣지 성분 영역(LD), 저주파의 수평 신호 엣지 성분 영역(LH), 및 저주파의 수직 신호 DPT지 성분 영역(LV)은 가변 블럭 부호화하여 벡터 양자화하고, DPT지 성분이 없는 저주파 성분 영역(LL)은 이산 여형 변환(DCT)하는 제4영상 신호 처리 수단(540)을 포함하는 것을 특징으로 하는 웨이브렛 변환을 이용한 부호화 장치.An image using a wavelet transform that outputs a diagonal edge (D) of high frequency, a horizontal signal edge (H), a vertical signal edge (V), and a low frequency signal (L) obtained by first-order wavelet transform of an input original image, respectively. 1. An encoding apparatus comprising: first image signal processing means (510) for detecting a contour in the diagonal edge component region (D) of high frequency, performing variable block encoding, and vector quantizing; Second image signal processing means (520) for detecting a contour component in the high frequency horizontal signal edge component region (H), performing variable block coding, and quantizing the vector; Third image signal processing means (530) for detecting a contour component in the high frequency vertical signal edge component region (V), performing variable block coding, and quantizing the vector; In the low frequency signal region L, the low edge diagonal edge component region LD, the low frequency horizontal signal edge component region LH, and the low frequency vertical signal DPT region component LV are vector quantized by variable block coding, A low frequency component region (LL) having no DPT paper component includes a fourth image signal processing means (540) for performing discrete transform transformation (DCT). 제1항에 있어서, 상기 제1에서 제3영상 신호 처리 수단(510, 520, 530)에서의 가변 블럭 부호화하는 32X32블럭부터, 상기 제4영상 신호 처리 수단(540)은 16X16블럭부터 외곽선 성분이 검출되는 블럭을 4X4블럭까지 가변 블럭화하여 외곽선 성분이 검출된 4X4블럭들만을 부호화 하는 것을 특징으로 하는 웨이블렛 변환을 이용한 영상 부호화 장치.The method of claim 1, wherein the first to third video signal processing means (510, 520, 530) from the 32X32 block to the variable block coding, the fourth video signal processing means 540 from the 16X16 block from the outline component An image encoding apparatus using wavelet transform, wherein the detected block is variable-blocked to 4 × 4 blocks to encode only 4 × 4 blocks in which an outline component is detected. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950010596A 1995-04-29 1995-04-29 Image signal encoding apparatus using a wavelet transform KR0171119B1 (en)

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KR960040022A true KR960040022A (en) 1996-11-25
KR0171119B1 KR0171119B1 (en) 1999-03-20

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KR100621584B1 (en) * 2004-07-15 2006-09-13 삼성전자주식회사 Video decoding method using smoothing filter, and video decoder thereof
KR100664932B1 (en) * 2004-10-21 2007-01-04 삼성전자주식회사 Video coding method and apparatus thereof

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