KR960036694A - Discrete Cosine Transform Coder Using Subsampling - Google Patents

Discrete Cosine Transform Coder Using Subsampling Download PDF

Info

Publication number
KR960036694A
KR960036694A KR1019950005797A KR19950005797A KR960036694A KR 960036694 A KR960036694 A KR 960036694A KR 1019950005797 A KR1019950005797 A KR 1019950005797A KR 19950005797 A KR19950005797 A KR 19950005797A KR 960036694 A KR960036694 A KR 960036694A
Authority
KR
South Korea
Prior art keywords
signal
subsampling
discrete cosine
image signal
interpolator
Prior art date
Application number
KR1019950005797A
Other languages
Korean (ko)
Other versions
KR0178900B1 (en
Inventor
정해묵
Original Assignee
배순훈
대우전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019950005797A priority Critical patent/KR0178900B1/en
Publication of KR960036694A publication Critical patent/KR960036694A/en
Application granted granted Critical
Publication of KR0178900B1 publication Critical patent/KR0178900B1/en

Links

Classifications

    • 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
    • H04N19/625—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

본 발명은 서브 샘플링을 이용한 이산 여현 변환 부호기에 관한 것으로, 보간기(18)를 부호기 부분의 서브 샘플링부(10)에 추가 설치하여 원래의 입력 화상 신호와 서브 샘플링부(10) 및 보간기(18)를 통과한 신호의 차이 즉, 보간시 발생할 수 있는 유실 화소 정보 신호를 서브 샘플링된 신호와 별도로 이상 여현 변환(DCT)처리한 후 양자화하고 부호화하여 전송함으로써, 복호기 부분에서 보간(Interpolation)을 할 때 전송된 유실 화소 정보 신호를 이용해 원래의 화상에 가까운 화상을 복원하는데 이점이 있다.The present invention relates to a discrete cosine transform encoder using subsampling, wherein an interpolator 18 is additionally installed in the subsampling unit 10 of the encoder portion, and the original input image signal, the subsampling unit 10 and the interpolator ( 18, that is, the interpolation is performed in the decoder part by performing quantization, encoding, and transmission of the difference between the signals passed through the signal, that is, the missing pixel information signal that may occur during interpolation, separately from the subsampled signal. In this case, there is an advantage in restoring an image close to the original image by using the lost pixel information signal.

Description

서브 샘플링을 이용한 이산 여현 변환 부호기Discrete Cosine Transform Coder Using Subsampling

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

제3도는 (가)도는 원 화상의 전체 화소 신호를 나타내는 도면, (나)도는 상기(가)도의 화상 신호에 대해서 1차 서브 샘플링한 도면, (다)도는 상기(나)도의 화상 신호에 대해서 2차 서브 샘플링한 도면, (라)도는 서브 샘플링을 하기 위한 마름모꼴 필터의 특성을 나타낸 도면, 제4도의 (가)도는 변환 부호화를 나타낸 블럭도, (나)도는 이산 여현 변환의 원리를 도시한 도면, 제5도는 본 발명에 따른 부호기에 대한 부분 블럭도이다.3 is a diagram showing all pixel signals of the original image (a), (b) is a first sub-sampled image signal of (a), and (c) is the image signal of (b) (D) is a block diagram showing the characteristics of the lozenge filter for subsampling, (A) is a block diagram showing transform coding, and (B) is a diagram showing the principle of discrete cosine transform. 5 is a partial block diagram of an encoder according to the present invention.

Claims (1)

입력 화상 신호의 화소 정보를 감소시키기 위해 서브 샘플링하기 위한 서브샘플링부(10)와; 상기 서브 샘플링부(10)에서 나온 서브 샘플링된 시간 계열의 화소치를 한 블럭이 8×8인 행렬의 연산에 따라 주파수 계열의 신호로 변환시키기 위한 제1 이산 여현 변환부(12); 상기 제1 이산 여현 변환부(12)에서 변환된 화상 신호에 대해 데이터 비트를 할당하여 디지탈 수치화하는 제1 양자화기(14); 상기 제2양자화기(14)에서 양자화된 화상 신호를 부호화해주는 제1부호화기(16); 상기 서브 샘플링부(10)에서 나온 서브 샘플링된 화상 신호를 보간해 주기 위한 보간기(18); 상기 입력 화상 신호와 상기 보간기(18)에서 보간된 서브 샘플링 신호의 차신호를 만들어내기 위한 감산기(20); 상기 감산기(20)에서 나온 상기 입력 화상 신호와 상기 보간기(18)에서 보간된 서브 샘플링 신호의 차 신호를 한 블럭이 8×8인 행렬의 연산에 따라 주파수 계열의 신호로 변환시키기 위한 제2 이산 여현 변환부(22); 상기 제2 이산 여현 변환부(22)에서 변환된 상기 차 신호에 대해 데이터 비트를 할당하여 디지탈 수치화하는 제2 양자화기(24); 및 상기 제2 양자화기(24)에서 양자화된 상기 차 신호를 부호화해주는 제2부호화기(26)를 포함하여 구성된 서브 샘플링을 이용한 이산 여현 변환 부호기.A subsampling section 10 for subsampling to reduce pixel information of the input image signal; A first discrete cosine transforming unit (12) for converting the pixel values of the sub-sampled time series from the sub-sampling unit (10) into a signal of the frequency series according to an operation of a matrix having one block of 8x8; A first quantizer (14) for allocating data bits to digital digitization of the image signal converted by the first discrete cosine converter (12); A first encoder 16 for encoding the image signal quantized by the second quantizer 14; An interpolator (18) for interpolating the subsampled image signal from the subsampling unit (10); A subtractor (20) for generating a difference signal between the input image signal and the subsampling signal interpolated by the interpolator (18); A second signal for converting a difference signal between the input image signal from the subtractor 20 and the sub-sampling signal interpolated by the interpolator 18 into a signal of a frequency series in accordance with an operation of a matrix having one block of 8x8 A discrete cosine transform unit 22; A second quantizer (24) for digitally quantizing data bits for the difference signals converted by the second discrete cosine transform unit (22); And a second encoder (26) for encoding the difference signal quantized by the second quantizer (24). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950005797A 1995-03-20 1995-03-20 A dct encoder using subsampling method KR0178900B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950005797A KR0178900B1 (en) 1995-03-20 1995-03-20 A dct encoder using subsampling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950005797A KR0178900B1 (en) 1995-03-20 1995-03-20 A dct encoder using subsampling method

Publications (2)

Publication Number Publication Date
KR960036694A true KR960036694A (en) 1996-10-28
KR0178900B1 KR0178900B1 (en) 1999-05-01

Family

ID=19410133

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019950005797A KR0178900B1 (en) 1995-03-20 1995-03-20 A dct encoder using subsampling method

Country Status (1)

Country Link
KR (1) KR0178900B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980018430A (en) * 1996-08-07 1998-06-05 체스킨 제이 엘. Band-limited Interpolation and Projection Method and Apparatus for Spatial 3-D Image
KR100670459B1 (en) * 2004-12-10 2007-01-16 엘지전자 주식회사 Video coding and decoding system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980018430A (en) * 1996-08-07 1998-06-05 체스킨 제이 엘. Band-limited Interpolation and Projection Method and Apparatus for Spatial 3-D Image
KR100670459B1 (en) * 2004-12-10 2007-01-16 엘지전자 주식회사 Video coding and decoding system

Also Published As

Publication number Publication date
KR0178900B1 (en) 1999-05-01

Similar Documents

Publication Publication Date Title
US5434622A (en) Image signal encoding apparatus using adaptive frame/field format compression
US10027962B2 (en) System, method and computer-readable medium for encoding a signal into macroblocks
EP1788816A3 (en) Transform domain interpolation for resolution conversion of coded video data
KR930018537A (en) Video signal band compression device of digital VTR
KR940027576A (en) Hierarchical Encoding / Decoding Apparatus and Method of Digital Image Signal
KR960036708A (en) Encoding / Decoding System for Encoding / Decoding Video Signals with Still Images
JP2880051B2 (en) Video signal encoding device using 1D / 2D DCT
JPH06225285A (en) System provided with at least one coder for coding digital signal and at least one decoder for decoding digital signal and coder and decoder for use in such system
JP3348612B2 (en) Inter-block prediction coding device, inter-block prediction decoding device, inter-block prediction coding method, inter-block prediction decoding method, and inter-block prediction coding / decoding device
KR100196838B1 (en) Apparatus for encoding an image signal according to correlation of blocks
JPH09187004A (en) Hadamard transformation coder and decoder for image signal
JPH0622147A (en) Hierarchical coding device and decoding device
KR960036756A (en) Image signal coding apparatus using vector quantization
US5422672A (en) System comprisisng at least one encoder for coding a digital signal and at least one decoder for decoding a coded digital signal, and encoder and decoder for use in the system
KR960036694A (en) Discrete Cosine Transform Coder Using Subsampling
JP2005516490A (en) Improved compression technology
EP0413570A2 (en) Picture data compression
JPH0216887A (en) Picture encodor
KR100192778B1 (en) A compatible encoder and decoder using ptsvq
KR0171749B1 (en) A compatible encoder
JP3591994B2 (en) Orthogonal transform coding method
KR970019567A (en) Adaptive Video Coding System
KR100204469B1 (en) An image encoder using corner data
KR930006522B1 (en) Video signal band compression apparatus
KR960036738A (en) Compatible Coder Using Grid Vector Quantization

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee