KR970049855A - Quantization Method and Apparatus by Error Diffusion Method in Image Processing Apparatus - Google Patents

Quantization Method and Apparatus by Error Diffusion Method in Image Processing Apparatus Download PDF

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KR970049855A
KR970049855A KR1019950067812A KR19950067812A KR970049855A KR 970049855 A KR970049855 A KR 970049855A KR 1019950067812 A KR1019950067812 A KR 1019950067812A KR 19950067812 A KR19950067812 A KR 19950067812A KR 970049855 A KR970049855 A KR 970049855A
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South Korea
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error
output
storage unit
image
quantization
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KR1019950067812A
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Korean (ko)
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KR0150164B1 (en
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김윤수
박기웅
박장식
김재호
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김광호
삼성전자 주식회사
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    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/008—Vector quantisation

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

이진양자화에 있어서, 이진화 오차를 양자화하여 저장하여 이를 이용함으로써 오차를 저장하는 저장수단의 크기를 줄이고, 저장수단으로의 일기와 쓰기 횟수를 줄이기는 위해 양자화된 오차를 이용한 오차확산 이진화법으로 이진화한 이진화상과 기존의 오차확산 이진화법으로 이진화한 이진화상을 환상평균 주파수 스펙트럼(radially averaged frequency spectrum)으로 비교한 결과 저주파에서 거의 차이가 없고, 고주파에 미소한 차이를 보이며, 인간의 시각특성인 저주파신호에 민감하고, 고주파 신호에 대해서 둔감하므로 화질의 차이가 거의 없도록 한 것임.In binary quantization, the binarization error is quantized and stored to use it to reduce the size of the storage means for storing the error, and to reduce the number of times of writing and writing to the storage means. Comparing binary images and binary images binarized by the conventional error-diffusion binarization with a radially averaged frequency spectrum, there is almost no difference at low frequencies, a slight difference at high frequencies, and low frequency, a human visual characteristic. It is sensitive to signal and insensitive to high frequency signal so that there is almost no difference in image quality.

Description

화상 처리장치에 있어서 오차 확산방법에 의한 양자화 방법및장치Quantization Method and Apparatus by Error Diffusion Method in Image Processing Apparatus

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

제1도는 본 발명에 따른 회로도.1 is a circuit diagram according to the present invention.

제2도는 제1도의 오차 양자화 장치(101)의 구체회로도.2 is a concrete circuit diagram of the error quantization apparatus 101 of FIG.

제3도는 인간의 시각적 주파수 특성도.3 is a visual frequency characteristic diagram of a human being.

제4도는 종래의 14비트오차 확산이 진화법의 이진화상(4A)과 본발명에 따른 8비트 오차이진화상의 확산스펙트럼비교도.4 is a spread spectrum comparison diagram of a conventional 14-bit error spreading binary image (4A) of the evolution method and an 8-bit error binary image according to the present invention.

Claims (2)

화상처리장치의 양자화 장치에 있어서. 상기 화상처리로의 입력화상과 이진화로 처리된 후 계산된 오차값을 저장하는 저장부(100)와. 상기 저장부(100)의 오차 저장부(111)에서 출력되는 오차값을 받아 더하는 오차가산기(103)와. 상기 오차가산기(103)의 출력과 상기 저장부(100)의 입력화상값을 더하는 덧셈기(104)와. 상기 덧셈기(104)에서 출력된 수정화상을 임시로 보관하는 수정화상 저장부(106)와. 상기 저장부(100)의 입력화상의 경계강조를 위해 소정의 계수로 승산하는 스켈러(105)와. 상기 스켈러(105)의 출력과 상기 수정화상 저장부(106)의 출력을 가산하는 가산기(107)와. 상기 가산기(107)의 출력을 이진양자화하는 이진 양자화부(108)와. 상기 수정화상 저장부(106)의 출력과 상기 이진 양자화부(108)의 출력으로 부터 오차를 발생하는 오차발생부(102)와. 상기 오차발생부(102)의 오차 출력값을 양자화하여 상기 저장부(100)의 오차 저장부(111)에 보관되는 오차양자화장치(101)로 구성됨을 특징으로 하는 장치.In a quantization apparatus of an image processing apparatus. A storage unit (100) for storing an error value calculated after the input image to the image processing and the binarization processing; An error adder 103 for adding and receiving an error value output from the error storage unit 111 of the storage unit 100; An adder (104) for adding an output of the error adder (103) and an input image value of the storage unit (100). A modified image storage unit 106 for temporarily storing the corrected image output from the adder 104; And a skeleton that multiplies by a predetermined coefficient to emphasize the boundary of the input image of the storage unit 100. An adder (107) for adding the output of the skeleton (105) and the output of the modified image storage unit (106). A binary quantizer 108 for binary quantizing the output of the adder 107; An error generator (102) for generating an error from an output of the corrected image storage (106) and an output of the binary quantization unit (108). And an error quantization device (101) stored in the error storage unit (111) of the storage unit (100) by quantizing the error output value of the error generation unit (102). 화상처리장치의 양자화 방법에 있어서. 상기 입력화상과 이진화로 처리된 후 계산된 오차를 저장하여 이를 출력하여 더하는 제1과정과. 상기 제1과정의 더한 오차합과 상기 저장된 입력화상값을 더하여 수정화상을 발생하여 임시로 보관하는 제2과정과. 상기 입력화상의 경계를 강조시켜 상기 수정화상과 가산하여 이진양자화하는 제3과정과. 상기 수정화상과 상기 이진양자화값으로 부터 오차를 발생하는 제4과정과. 상기 오차 출력값을 양자화하여 상기 오차저장부에 보관하는 제5과정으로 구성됨을 특징으로 하는 화상처리장치에 있어서 오차확산법에 의한 양자화 방법.In a quantization method of an image processing apparatus. A first step of storing the calculated error after the input image and the binarization and outputting the stored error; A second step of generating a modified image temporarily by adding the error sum of the first step and the stored input image value; A third step of emphasizing the boundary of the input image and adding the modified image to the binary quantization; A fourth step of generating an error from the corrected image and the binary quantization value; And a fifth process of quantizing the error output value and storing the error output value in the error storage unit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950067812A 1995-12-30 1995-12-30 Quantization method and apparatus using error diffusion for image processing system KR0150164B1 (en)

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