• 한국멀티미디어학회논문지
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• 제16권2호
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• pp.119-130
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• 2013

본 논문에서는 디지털 영상의 색상을 유지하면서 영상의 명암대비 향상과 함께 채도를 향상시키는 방법을 제시한다. 제안방법은 명암대비 향상 후 밝기 변화에 따른 시각적인 채도 변화를 보정하기 위해 최대색차신호 테이블을 이용한다. 최대색차신호 테이블로부터 휘도변화에 따른 가중치를 구하고, 입력 색차신호에 가중치를 곱하여 채도를 밝기에 적응적으로 보정한다. 또한 사용자가 입력한 만큼의 채도를 향상시키는 과정에서 과도한 채도 향상으로 인한 왜곡을 막기 위해 휘도와 색상에 따른 채도의 상관관계를 고려하여 색차신호가 올바른 색역에 사상될 수 있도록 한다. 다양한 특성을 갖는 영상에 대한 실험을 통해 제안방법은 기존방식과 비교하여 효과적으로 컬러 영상의 선명도를 향상시킴을 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.385-388
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• 2003

In this paper, we propose a new saturation enhancement algorithm which is processed on the new color space, called Normalized YCbCr(NYCbCr). The algorithm consists of two processing unit. One is color space conversion from YCbCr to NYCbCr, and the other is using adaptive saturation mapping function(ASMF). NYCbCr color space is designed to prevent shortcomings such as luminance and hue shift of YCbCr color space and by saturation enhancement. ASMF is effective to enhance saturation properly for each image and to protect low saturation regions of color images from over-saturation. we verified our method using several color images. Experimental results show that the proposed method enhance the saturation with minimizing Luminance and Hue shift.

• 방송공학회논문지
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• 제20권5호
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• pp.770-773
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• 2015

영상의 화질을 향상시키기 위하여 콘트라스트(contrast)를 향상시키는 기법이 많이 사용된다. 컬러 영상의 콘트라스트를 향상시키는 경우에 컬러의 saturation이 높은 순수한 색에 대해서는 과도한 콘트라스트 향상으로 인한 색 포화 현상이 발생할 수 있다. 본 논문에서는 HSI 컬러 공간에서 saturation 성분을 이용하여 순수한 색에 대한 과도한 콘트라스트 향상으로 발생할 수 있는 색 포화 현상을 방지할 수 있는 기법과 YCbCr 컬러 공간에서도 동일한 효과를 보이는 컬러 영상 화질 향상 기법을 제안한다. 다양한 영상에 대한 실험 결과 제안하는 기법이 기존의 방법에 비하여 좋은 화질의 영상을 생성하는 것을 보인다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.1035-1038
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• 2007

In this paper, we propose a color image improvement method. The proposed algorithms are classified with the adaptive contrast stretching method for contrast enhancement and the adaptive saturation enhancement method for saturation enhancement. The adaptive contrast stretching method is to compensate a significant change of brightness while luminance is processed. The adaptive saturation enhancement method inhibits its saturation from de-saturation and oversaturation while chrominance is processed. The proposed algorithms are focused on a preference color processing in order to generate better image quality than the algorithms focused on a uniform color processing for human vision.

• 전기학회논문지P
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• 제57권1호
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• pp.22-29
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• 2008

In this paper, we propose an adaptive color enhancement algorithm. It is used for the flat panel displays (FPDs) such as LCD, PDP, and so on. The proposed algorithm consists of an adaptive linear approximation CDF(Cumulative Density Function) algorithm and an adaptive saturation enhancement algorithm. The one is for contrast enhancement which prevents an image from the distortion by luminance transient of an input image. The other is the algorithm which improves the saturation without the contour artifact and over-saturation, whose problems are generated during the enhancing saturation. In addition, it allows to achieve the high quality image using the saturation enhancement method for a preferred color of original image. Visual test and standard deviation of their histograms have been applied to evaluate the resultant output images of the proposed algorithm.

• 한국산학기술학회논문지
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• 제16권2호
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• pp.1414-1419
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• 2015

영상에서 피부영역을 탐지하는 방법은 색상 정보를 이용하여 탐지하는 방법이 일반적이다. 하지만 영상의 채도가 낮아지는 경우 색상정보가 손실되어 올바른 피부영역 탐지가 어렵다는 단점이 있다. 따라서 본 논문은 촬영 시 밝은 조명에 의해 채도 정보가 낮아진 피부 영상의 색상 보정 방법을 제안한다. 제안한 방법의 색상 보정 절차는 채도 영상 획득 및 저채도 영역 분류, 영역 분할, 분할한 저채도 영역에서의 채도 및 색상값 추출, 색상 보정 순이다. 이 방법은 영상에서 채도가 낮은 부분을 추출한 후 해당 영역 및 주변영역의 색상과 채도를 추출하는 방법을 통해 원 색상과 유사한 색상을 예측하여 적용한다. 따라서 저채도 영역을 올바르게 산출하는 방법이 선행되어야 한다. 저채도 영역을 구하는 과정에서 보다 정확한 영역 분할을 위하여 HSV 색상공간의 Hue 값에 오츠가 제안한 다중문턱치를 이용하여 이진 영상을 만든 후 사용하였다. 170장의 인물 사진들을 사용하여 실험을 수행한 결과, 제안한 방법을 사용하지 않은 피부 결과에 비해 약 5.8% 이상 검출율이 높게 나타났으며, 제안하는 방법이 피부색 탐지를 위한 전처리에 적합함을 확인하였다.

• Journal of Information Display
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• 제10권4호
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• pp.164-170
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• 2009

The dependences of color gamut size and power consumption on the area ratio of the neutral and green subpixels for the RGB-LED-backlight RGBW LCD were studied, in which the red- and blue-subpixel areas are the same and represent one-quarter of the pixel aperture area. It was found that the color saturation of the RGBW LCD can be improved through the use of a smaller neutral- and green-subpixel area ratio, at the expense of higher power consumption.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1073-1076
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• 2009

The dependences of color gamut size and power consumption on the area ratio of neutral and green sub-pixels for the RGBW LCD with RGB LED backlit are studied, in which the areas of red and blue sub-pixels are the same and are one quarter of pixel apertu re area. It is found that high color saturation and power saving can be achieved for the proposed RGBW LCD.

• 한국환경보건학회지
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• 제38권2호
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• pp.136-141
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• 2012

Objectives: The objective of this study was to investigate whether the ammonia nitrogen concentration of aqueous samples such as drinking water can be determined by measuring the saturation of the samples colored by indophenol method. Methods: A color saturation measurement system was constructed by connecting a notebook computer to an image acquisition device composed of a PC camera and a light source, and was then used to measure the saturation of samples colored by blue indophenol complex. Results: Between two available light sources, a fluorescent lamp was selected due to its demonstrating better linearity between color saturation and ammonia nitrogen concentration. Prediction by quadratic regression was more accurate than by linear regression, and prediction by quadratic regression in the concentration range of 0.1-1.0 $mg/l$ was more accurate than in the concentration range of 0.0-1.0 $mg/l$. Regression-based predictions over 0.25 $mg/l$, 0.55 $mg/l$ and 0.75 $mg/l$ concentrations were implemented both by spectrophotometric method and by measuring color saturation. In the case of 0.25 $mg/l$, the predicted concentration by spectrophotometric method was $0.256{\pm}0.0076\;mg/l$ and the predicted concentration by measuring color saturation was $0.246{\pm}0.0086\;mg/l$ (p=0.051). In the case of 0.55 $mg/l$, they were $0.561{\pm}0.0068\;mg/l$ and $0.564{\pm}0.0166\;mg/l$ (p=0.660). In the case of 0.75 $mg/l$, they were $0.755{\pm}0.0139\;mg/l$ and $0.762{\pm}0.0088\;mg/l$ (p=0.215). Conclusions: There were no statistically significant differences (p>0.05) between the data from the two methods in all three of the concentrations. Therefore, the color saturation measurement method proposed in this paper may be considered applicable for determining the ammonia nitrogen concentration of aqueous samples such as drinking water.

• Journal of Ceramic Processing Research
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• 제19권6호
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• pp.479-482
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• 2018

Polystyrene superstructure films show faint rainbow color, and this low color saturation limits its wide application. In this paper, polystyrene superstructure films with single bright blue color were prepared by vertical deposition self-assembly method using polystyrene microspheres with average diameter of $310{\pm}10nm$ as raw material. Polystyrene superstructure films were modified by adding nano-carbon powder, and effect of the amount of nano-carbon powde on color performance was studied. The results showed that without addition of nano-carbon powder, the superstructure films showed a faint rainbow color, while with addition of nano-carbon power, the superstructure films exhibited a single bright blue under the same natural light source. Changing the amount of nano-carbon powder addition could adjust color saturation of the film. With increasing the amount of nano-carbon powder addition from 0.008 wt% to 0.01 wt%, color saturation of the superstructure film increased gradually. Further increasing the amount of nano-carbon powder addition to 0.011wt%, color saturation of the superstructure film didn't increase anymore and tended to get dark.