• 한국산학기술학회논문지
• /
• 제8권5호
• /
• pp.1098-1103
• /
• 2007

본 논문에서는 칼라 영상에서 적목(red eye)의 자동 검출 및 제거 방법을 제안한다. 제안한 방법은 적색도(redness)와 기하학적 특징에 기반하여 초기 적목 영역을 검출하고, 초기 적목 영역 주위의 국소적 특성을 반영하여 최종 적목 영역을 검출한다. 최종 적목 영역에 대해 소프트 제거에 기반한 방법을 사용하여 적목을 제거한다. 실험에서 제안한 방법은 Willamowski와 Csurka[1]의 방법에 비해 적목 영역의 검출과 제거 결과가 개선되었다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2007년도 하계종합학술대회 논문집
• /
• pp.365-366
• /
• 2007

In this paper, a novel correction method of red-eye effect is proposed. Conventional methods simply reduce red components in red-eye regions, not considering the expanded size of a pupil, thus the correction results can be unnatural. In the proposed method, an exemplar-based inpainting method is used for reducing the pupil region and filling the iris texture instead. Experimental results show that the proposed method is effective and its correction results look more natural than those of conventional methods.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2007년도 춘계학술발표논문집
• /
• pp.176-177
• /
• 2007

본 논문에서는 칼라 영상에서 적목(red eye)의 자동 검출 및 제거 방법을 제안한다. 제안한 방법은 적색도(redness)와 기하학적 특정에 기반하여 적목 영역을 검출하고, 적목 영역 주위의 국소적 특성을 반영하여 최종 적목 영역을 검출한다. 최종 적목 영역에 대해 소프트 제거에 기반한 방법을 사용하여 적목을 제거한다. 실험에서 제안한 방법은 기존의 방법에 비해 적목 영역의 검출과 제거 결과가 개선되었다.

• 대한치과보철학회지
• /
• 제35권2호
• /
• pp.330-343
• /
• 1997

Extraoral maxillofacial prostheses are essential for restoring facial structures that are lost as a result of congenital missing, injuries from accidents, surgical treatments of head and neck cancer. Recently, silicone is the most useful material for this purpose and is more advantageous than other maxillofacial prosthetic materials. However, there are some problems for long-term usage of silicone prostheses due to tear and color change. These are major contributing environmental factors to those problems that are such as ultraviolet light, cleansing agents, changes in humidity and successive adhesion and removal. The aim of this study is to evaluate the physical properties and color changes of maxillofacial prosthetic silicone material by those environmental factors using A-2186 silicone material (Factor II, USA) and two pigments, cadmium yellow medium and cosmetic red. Aluminium molds were fabricated according to the ASTM No. D412 & D624 specifications and resulted specimens from molds were fabicated and treated as follows. Control group and experimental I group were fabricated with 0.1% wt. pigment mixing in silicone elastomer and II-1 group, II-2 group of experimental II group were fabricated with 0.2%, 0.3% wt. pigment mixing in silicone elastomer, respectively. Control group was kept in darkroom at room temperature, I-1 group was kept under natural sunlight during 1week, I-2 group was soaked in 20% soap water during 1wk. I-3 group was successively adhered and removed 200 times on inner region of arm using Daro adhesive-33. Experimental II groups were kept in darkroom at room temperature. Instron universal testing machine was used to measure the % elongation, tensile strength, tear strength of control, experimental I, II groups and reflectance spectrophotometer(COLOR EYE-3000, Macbeth, USA) was used to measure the color differences between control group and experimental I group. The results were as follows : 1. When compared with control group, natural weathering group and 20% soap-water soaking group had no significant differences in % elongation(p>0.05). 2. 200 times successive adhesion and removal group, 0.2% wt. pigment group and 0.3% wt. pigment group had significant decreases in % elongation(p<0.05). 3. Natural weathering group, 20% soap-water soaking group and 200 times successive adhesion and removal group had no significant differences in tensile strength (p>0.05). 4. 0.2%, 0.3% wt. pigment groups had significant decreases in tensile strength(p<0.05). 5. Values of all experimental groups were decreased in tear strength. and 200 times successive adhesion and removal group had significant decrease in tear strength(p<0.05). 6. Natural weathering group and 20% soap-water soaking group had significant color differences(${\Delta}E$) and it could be detectable to naked eye(p<0.05). 7. Color differences between control group and 200 times adhesion and removal group were not detectable to the naked eye (${\Delta}E<1.0$).

• 한국정보컨버전스학회논문지
• /
• 제5권2호
• /
• pp.77-83
• /
• 2012

본 연구에서는 미용 콘택트렌즈 착용에 1주와 2주에 대한 삽입 상태를 평가 하였다. '렌즈의 삽입과 제거가 용이 하다'에서 1주와 2주 모두 '긍정'의 평가가 나왔으며 '삽입 중 거울을 봤을 때 눈이 빨갛다'에서는 1주에서는 '부정'의 평가가 18명(45%), 2주에서는 '부정'의 평가가 14명(35%)로 나와 시간이 지남에 따라 자각적인 충혈도는 줄어듬을 볼 수 있었다. '향후 렌즈 구매 의사'에서 1주차에서는 긍정>부정의 결과로 나왔고, 2주에서는 긍정=부정으로 평가가 되었다. 하지만 보통이상의 평가로는 1주, 2주 모두 26명(65%)으로 변화없음을 보였다. 착용 기간이 늘어남에 따라 삽입 시의 시력상태, 건조감에서는 보다 긍정적인 평가를 보였고, 편안함에서는 비슷한 평가가 나타났다. 제거 시의 시력상태, 편안함, 건조감에서는 다소 부정적인 평가가 나타났지만, 일상생활 시에는 시력상태, 편안함, 건조감 모두에서 긍정적인 평가가 나타남으로 착용 중일 때 보다 긍정적인 평가가 나타남을 알 수 있었다.

• Current Optics and Photonics
• /
• 제3권3호
• /
• pp.256-262
• /
• 2019

Extensive tumor resection accompanied by radiotherapy and chemotherapy is the standard of care for malignant gliomas. However, there is a significant obstacle to the complete resection of the tumor due to the difficulty of distinguishing tumor and normal brain tissue with a conventional surgical microscope. Recently, multiple studies have shown the possibility of fluorescence-guided surgery in malignant gliomas. The most used fluorescence dyes for brain tumor surgery are 5-aminolevulinic acid (5-ALA) and indocyanine green (ICG). In this paper, a new fluorescence guided operation system, which can detect both 5-ALA and ICG fluorescent images simultaneously, is presented. This operation system consists of light emitting diodes (LEDs) which emits 410 nm and 740 nm wavelengths. We have performed experiments on rats in order to verify the operation of the newly developed operation system. Oral administration and imaging were performed to observe the fluorescence of 5-ALA and ICG fluorescence in rats. When LEDs at wavelengths of 410 nm and 740 nm were irradiated on rats, 628 nm wavelength with a violet fluorescence color and 825 nm wavelength with a red fluorescence color were expressed in 5-ALA and ICG fluorescent material, respectively, thus we were able to distinguish the tumor tissues easily. Previously, due to the poor resolution of the conventional surgical microscope and the fact that the color of the vein is similar to that of the tumor, the tumor resection margin was not easy to observe, thus increasing the likelihood for cancer recurrence. However, when the tumor is observed through the fluorescence guided operation system, it is possible to easily distinguish the color with the naked eye and it can be completely removed. Therefore, it is expected that surgical removal of cancerous tumors will be possible and surgical applications and surgical microscopes for cancer tumor removal surgery will be promising in the future.