KR950024507A - Image Contrast Improvement Circuit - Google Patents

Image Contrast Improvement Circuit Download PDF

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Publication number
KR950024507A
KR950024507A KR1019940001748A KR19940001748A KR950024507A KR 950024507 A KR950024507 A KR 950024507A KR 1019940001748 A KR1019940001748 A KR 1019940001748A KR 19940001748 A KR19940001748 A KR 19940001748A KR 950024507 A KR950024507 A KR 950024507A
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KR
South Korea
Prior art keywords
contrast
improvement circuit
image
high frequency
frequency component
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Application number
KR1019940001748A
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Korean (ko)
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KR100213013B1 (en
Inventor
이재준
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김광호
삼성전자 주식회사
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Priority to KR1019940001748A priority Critical patent/KR100213013B1/en
Publication of KR950024507A publication Critical patent/KR950024507A/en
Application granted granted Critical
Publication of KR100213013B1 publication Critical patent/KR100213013B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/80—Camera processing pipelines; Components thereof
    • H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

본 발명에 의한 영상의 명암대비 개선회로에서 명암대비를 개선하고자 하는 영상의 각 화소마다 명암대비를 구하여 소정치 이하의 명암대비에서 대해서만 선택적으로 명암대비를 높여 줌으로써 원래 영상을 손상시키지 않고 화질을 개선할 수 있는 이점이 있다.In the contrast improvement circuit of the image according to the present invention, the contrast is obtained for each pixel of the image to improve the contrast, and the image quality is improved without damaging the original image by selectively increasing the contrast only for the contrast below the predetermined value. There is an advantage to this.

Description

영상의 명암대비 개선회로Image Contrast Improvement Circuit

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

제2도는 영상의 명암대비 분포도이다.2 is a contrast map of an image.

제3도는 본 발명에 의한 영상의 명암대비 개선회로의 일실시예에 따른 블럭도이다.3 is a block diagram according to an embodiment of a contrast enhancement circuit of an image according to the present invention.

Claims (4)

명암대비를 개선하고자 하는 입력영상신호(P(x, y))의 고주파 성분(PH(x, y))을 추출하기 위한 고주파성분 추출부; 상기 입력영상신호의 가가 화소마다의 명암대비(C(X, Y))를 산출하기 위한 명암대비 산출부; 상기 명암대비 산출부에서 산출한 명암대비가 명암대비 분포도에서 제1소정의 문턱값(Th1) 및 제2소정의 문턱값(Th2) 사이에 위치하는가를 판단하여 명암대비 개선여부를 결정하기 위한 명암대비 개선여부 결정부 및 상기 명암대비 개선여부 결정부에서 명암대비를 개선시키도록 결정한 경우 상기 입력영상신호에 상기 고주파성분 추출부의 출력신호를 더하여 명암대비를 개선하는 명암대비 개선부를 포함하는 것을 특징으로 하는 영상의 명암대비 개선회로.A high frequency component extracting unit for extracting a high frequency component P H (x, y) of an input image signal P (x, y) to improve contrast; A contrast calculator for calculating a contrast (C (X, Y)) for each pixel of the input video signal; The contrast is determined to determine whether the contrast is improved by determining whether the contrast calculated by the contrast calculator is located between the first predetermined threshold Th1 and the second predetermined threshold Th2 in the contrast distribution map. And a contrast improver that improves contrast by adding an output signal of the high frequency component extractor to the input image signal when the contrast determiner and the contrast determiner determine to improve contrast. Contrast improvement circuit of images. 제1항에 있어서, 상기 고주파성분 추출부는 PH(x, y) = 2P2(X, y) - P(x-1, y)P(X + 1, y) - P(x, y-1) P(x, y+1)식에 의해 수행되는 것을 특징으로 하는 영상의 명암대비 개선회로.The method of claim 1, wherein the high frequency component extraction unit PH (x, y) = 2P 2 (X, y)-P (x-1, y) P (X + 1, y)-P (x, y-1 ) Contrast improvement circuit of the image, characterized in that performed by the formula P (x, y + 1). 제1항에 있어서, 상기 명암대비 산출부는The method of claim 1, wherein the contrast calculator 식에 의해 수행되는 것을 특징으로 하는 영상의 명암대비 개선회로.Contrast improvement circuit of the image, characterized in that performed by the formula. 제1항에 있어서, 상기 명암대비 개선부에서는 명암개선된 출력영상은 PCE(x, y)라고 할 경우The method of claim 1, wherein the contrast improving unit contrast-improved output image is P CE (x, y) 여기서 a = 1, if Th1 ≤ C(x, y) ≤ Th2, a=0, if C (x, y) ＜ Th1 or C(X, y) ＞ Th2식에 의해 수행되는 것을 특징으로 하는 영상의 명암대비 개선회로.Where a = 1, if Th1 < C (x, y) < Th2, a = 0, if C (x, y) < Th1 or C (X, y) > Contrast improvement circuit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940001748A 1994-01-31 1994-01-31 A circuit for improving contrast of image KR100213013B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940001748A KR100213013B1 (en) 1994-01-31 1994-01-31 A circuit for improving contrast of image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940001748A KR100213013B1 (en) 1994-01-31 1994-01-31 A circuit for improving contrast of image

Publications (2)

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KR950024507A true KR950024507A (en) 1995-08-21
KR100213013B1 KR100213013B1 (en) 1999-08-02

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KR1019940001748A KR100213013B1 (en) 1994-01-31 1994-01-31 A circuit for improving contrast of image

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101458616B1 (en) * 2013-05-21 2014-11-11 부경대학교 산학협력단 Image contrast improvement method by discrete cosine transform and histogram processing
KR20160025876A (en) * 2014-08-28 2016-03-09 인천대학교 산학협력단 Method and apparatus for intensificating contrast in image
KR102009503B1 (en) * 2019-02-12 2019-08-09 엘아이지넥스원 주식회사 Method and system for narrowband LOFAR
KR102342940B1 (en) * 2021-06-23 2021-12-27 주식회사 포바이포 Method for One-Step L0 Smoothing via Deep Gradient Prior

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101334029B1 (en) * 2012-01-31 2013-11-28 (주)토탈소프트뱅크 Method for extracting muscle of head and neck and method of ＲＯＩ analysis

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101458616B1 (en) * 2013-05-21 2014-11-11 부경대학교 산학협력단 Image contrast improvement method by discrete cosine transform and histogram processing
KR20160025876A (en) * 2014-08-28 2016-03-09 인천대학교 산학협력단 Method and apparatus for intensificating contrast in image
KR102009503B1 (en) * 2019-02-12 2019-08-09 엘아이지넥스원 주식회사 Method and system for narrowband LOFAR
KR102342940B1 (en) * 2021-06-23 2021-12-27 주식회사 포바이포 Method for One-Step L0 Smoothing via Deep Gradient Prior
WO2022270854A1 (en) * 2021-06-23 2022-12-29 주식회사 포바이포 Depth gradient advance information-based l0 smoothing method for improving sharpness

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