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Contrast Enhancement Method using Color Components Analysis

컬러 성분 분석을 이용한 대비 개선 방법

  • Park, Sang-Hyun (Dept. Multimedia Engineering, Sunchon National University)
  • 박상현 (순천대학교 멀티미디어공학과)
  • Received : 2019.05.27
  • Accepted : 2019.08.15
  • Published : 2019.08.31

Abstract

Recently, as the sensor network technologies and camera technologies develops, there are increasing needs by combining two technologies to effectively observe or monitor the areas that are difficult for people to access by using the visual sensor network. Since the applications using visual sensors take pictures of the outdoor areas, the images may not be well contrasted due to cloudy weather or low-light time periods such as a sunset. In this paper, we first model the color characteristics according to illumination using the characteristics of visual sensors that continuously capture the same area. Using this model, a new method for improving low contrast images in real time is proposed. In order to make the model, the regions of interest consisting of the same color are set up and the changes of color according to the brightness of images are measured. The gamma function is used to model color characteristics using the measured data. It is shown by experimental results that the proposed method improves the contrast of an image by adjusting the color components of the low contrast image simply and accurately.

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그림 1. 다양한 EV값을 촬영된 맥베스 컬러체커 Fig. 1. Macbeth colorcheckers using various EV’s

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그림 2. 관심영역 후보 예 Fig. 2 Region of interest candidates

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그림 3 제안하는 알고리즘의 블록 다이어그램 Fig. 3 Block diagram of the proposed algorithm

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그림 5. 입력 영상의 분할 Fig. 5 Segmentation of the input image

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그림 6. k-mean 군집화를 이용하여 선정된 관심 영역 Fig. 6 Selected regions of interest using k-mean clustering

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그림 7. 7개 영역의 R 채널 특성 Fig. 7 R channel characteristics of 7 regions

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그림 8. 채널 특성을 이용한 색상 값 보정 Fig. 8. Adjustment of a color value using channel characteristics

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그림 9. k-mean 군집화를 이용하여 선정된 15개의 관심 영역 Fig. 9 15 Selected regions of interest using k-mean clustering

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그림 10. 환경 감시 영상 (a) 해변, (b) 섬, (c) 호수, (d) 부두 Fig. 10 Images of environmental monitoring (a) beach, (b) island, (c) lake, (d) wharf

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그림 11. 대비 개선된 결과 영상 (a) 해변, (b) 섬, (c) 호수, (d) 부두 Fig. 11 Contrast enhanced resulting images (a) beach, (b) island, (c) lake, (d) wharf

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그림 12. 대비 개선된 결과 영상 (a) 해변, (b) 섬, (c) 호수, (d) 부두 Fig. 12 Contrast enhanced resulting images (a) beach, (b) island, (c) lake, (d) wharf

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