METHOD AND APPARATUS FOR ENHANCING DIGITAL IMAGE, AND APPARATUS FOR IMAGE PROCESSING USING THE SAME

METHOD AND APPARATUS FOR ENHANCING DIGITAL IMAGE, AND APPARATUS FOR IMAGE PROCESSING USING THE SAME

According to an embodiment of the present invention, a method for enhancing a digital image, which is performed in a computer, comprises the following steps: converting a color space of an inputted digital image into YCbCr from RGB so as to generate a brightness component (Y component), a Cb compone...

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Hauptverfasser: SIM, SANG KWON, SONG, SANG HYEOB, CHO, JUN DONG, CHO, HYEONG JUN, YOON, WON JONG
Format: Patent
Sprache:eng ; kor
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ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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creator SIM, SANG KWON
SONG, SANG HYEOB
CHO, JUN DONG
CHO, HYEONG JUN
YOON, WON JONG
description According to an embodiment of the present invention, a method for enhancing a digital image, which is performed in a computer, comprises the following steps: converting a color space of an inputted digital image into YCbCr from RGB so as to generate a brightness component (Y component), a Cb component, and a Cr component; filtering the brightness component with a smoothing filter having a predetermined cut-off frequency so as to generate an illuminance component (L component); generating a reflected component map based on a reflected component which divides the brightness component into the illuminance component by each pixel; generating the brightness component normalized and corrected based on a histogram of the reflected component map; and converting the corrected brightness component, the Cb component, and the Cr component into the RGB from the YCbCr to generate a digital enhancement image. 본 발명의 실시예에 따른 컴퓨터에서 수행되는 디지털 이미지 향상 방법은 입력되는 디지털 이미지의 색공간을 RGB에서 YCbCr로 변환하여, 휘도 성분(Y 성분), Cb 성분 및 Cr 성분을 생성하는 단계, 휘도 성분을 소정의 컷오프 주파수를 가지는 평활화 필터로 필터링하여 조명 성분(L 성분)을 생성하는 단계, 각 픽셀마다 휘도 성분을 조명 성분으로 나눈 반사 성분에 기초하여 반사 성분 맵을 생성하는 단계, 반사 성분 맵의 히스토그램을 기초로 정규화하여 보정된 휘도 성분을 생성하는 단계 및 보정된 휘도 성분과 Cb 성분 및 Cr 성분을 YCbCr에서 RGB로 변환하여 디지털 향상 이미지를 생성하는 단계를 포함할 수 있다.
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filtering the brightness component with a smoothing filter having a predetermined cut-off frequency so as to generate an illuminance component (L component); generating a reflected component map based on a reflected component which divides the brightness component into the illuminance component by each pixel; generating the brightness component normalized and corrected based on a histogram of the reflected component map; and converting the corrected brightness component, the Cb component, and the Cr component into the RGB from the YCbCr to generate a digital enhancement image. 본 발명의 실시예에 따른 컴퓨터에서 수행되는 디지털 이미지 향상 방법은 입력되는 디지털 이미지의 색공간을 RGB에서 YCbCr로 변환하여, 휘도 성분(Y 성분), Cb 성분 및 Cr 성분을 생성하는 단계, 휘도 성분을 소정의 컷오프 주파수를 가지는 평활화 필터로 필터링하여 조명 성분(L 성분)을 생성하는 단계, 각 픽셀마다 휘도 성분을 조명 성분으로 나눈 반사 성분에 기초하여 반사 성분 맵을 생성하는 단계, 반사 성분 맵의 히스토그램을 기초로 정규화하여 보정된 휘도 성분을 생성하는 단계 및 보정된 휘도 성분과 Cb 성분 및 Cr 성분을 YCbCr에서 RGB로 변환하여 디지털 향상 이미지를 생성하는 단계를 포함할 수 있다.</description><language>eng ; kor</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; 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SONG, SANG HYEOB ; CHO, JUN DONG ; CHO, HYEONG JUN ; YOON, WON JONG</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_KR20160002517A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng ; kor</language><creationdate>2016</creationdate><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>PICTORIAL COMMUNICATION, e.g. TELEVISION</topic><toplevel>online_resources</toplevel><creatorcontrib>SIM, SANG KWON</creatorcontrib><creatorcontrib>SONG, SANG HYEOB</creatorcontrib><creatorcontrib>CHO, JUN DONG</creatorcontrib><creatorcontrib>CHO, HYEONG JUN</creatorcontrib><creatorcontrib>YOON, WON JONG</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SIM, SANG KWON</au><au>SONG, SANG HYEOB</au><au>CHO, JUN DONG</au><au>CHO, HYEONG JUN</au><au>YOON, WON JONG</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>METHOD AND APPARATUS FOR ENHANCING DIGITAL IMAGE, AND APPARATUS FOR IMAGE PROCESSING USING THE SAME</title><date>2016-01-08</date><risdate>2016</risdate><abstract>According to an embodiment of the present invention, a method for enhancing a digital image, which is performed in a computer, comprises the following steps: converting a color space of an inputted digital image into YCbCr from RGB so as to generate a brightness component (Y component), a Cb component, and a Cr component; filtering the brightness component with a smoothing filter having a predetermined cut-off frequency so as to generate an illuminance component (L component); generating a reflected component map based on a reflected component which divides the brightness component into the illuminance component by each pixel; generating the brightness component normalized and corrected based on a histogram of the reflected component map; and converting the corrected brightness component, the Cb component, and the Cr component into the RGB from the YCbCr to generate a digital enhancement image. 본 발명의 실시예에 따른 컴퓨터에서 수행되는 디지털 이미지 향상 방법은 입력되는 디지털 이미지의 색공간을 RGB에서 YCbCr로 변환하여, 휘도 성분(Y 성분), Cb 성분 및 Cr 성분을 생성하는 단계, 휘도 성분을 소정의 컷오프 주파수를 가지는 평활화 필터로 필터링하여 조명 성분(L 성분)을 생성하는 단계, 각 픽셀마다 휘도 성분을 조명 성분으로 나눈 반사 성분에 기초하여 반사 성분 맵을 생성하는 단계, 반사 성분 맵의 히스토그램을 기초로 정규화하여 보정된 휘도 성분을 생성하는 단계 및 보정된 휘도 성분과 Cb 성분 및 Cr 성분을 YCbCr에서 RGB로 변환하여 디지털 향상 이미지를 생성하는 단계를 포함할 수 있다.</abstract><oa>free_for_read</oa></addata></record>
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ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
title METHOD AND APPARATUS FOR ENHANCING DIGITAL IMAGE, AND APPARATUS FOR IMAGE PROCESSING USING THE SAME
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