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학술지 Automatic Contrast Enhancement by Transfer Function Modification
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저자
배태욱, 안상호, Yucel Altunbasak
발행일
201702
출처
ETRI Journal, v.39 no.1, pp.76-76
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.17.0115.0880
협약과제
16ZC3100, 지역기반 의료기기.의료로봇 기술개발 및 의료IT 융합 중소기업 활성화 사업, 최은창
초록
In this study, we propose an automatic contrast enhancement method based on transfer function modification (TFM) by histogram equalization. Previous histogram-based global contrast enhancement techniques employ histogram modification, whereas we propose a direct TFM technique that considers the mean brightness of an image during contrast enhancement. The mean point shifting method using a transfer function is proposed to preserve the mean brightness of an image. In addition, the linearization of transfer function technique, which has a histogram flattening effect, is designed to reduce visual artifacts. An attenuation factor is automatically determined using the maximum value of the probability density function in an image to control its rate of contrast. A new quantitative measurement method called sparsity of a histogram is proposed to obtain a better objective comparison relative to previous global contrast enhancement methods. According to our experimental results, we demonstrated the performance of our proposed method based on generalized measures and the newly proposed measurement.
키워드
Automatic contrast enhancement, Linearization of transfer function, Mean point shifting, Sparsity of a histogram, Transfer function modification
KSP 제안 키워드
Contrast Enhancement(CE), Enhancement method, Flattening effect, Global contrast, Histogram-based, Probability Density Function, Shifting method, attenuation factor, contrast enhancement techniques, histogram equalization, histogram modification(HM)
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