1 : (Young-Jin Kim et al.: A Study on the Mode of Address and Meaning Creation of Underlight in Broadcasting Lighting) (Special Paper) 21 5, (J

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1 (Special Paper) 21 5, (JBE Vol. 21, No. 5, September 2016) ISSN (Online) ISSN (Print) a), b) A Study on the Mode of Address and Meaning Creation of Underlight in Broadcasting Lighting Young-Jin Kim a) and Gooman Park b) HDTV. HDTV.. HD.,,. 17% 25.5%, 40cm, 20cm.. Abstract As contents in broadcasting have been created in HDTVs and monitors have been commercialized, facial expression of objects in broadcasting lighting has become a very significant task. Figure modeling of objects in HDTVs requires smoother and cleaner video s owing to the expansion of precision of expression by light. Lighting methods that enlighten characters in the digital generation have come to require a new change. Character modeling methods used on expression features of underlight are receiving attention for aesthetic expression of figures in HD s. Accordingly, the influence of underlight light source intensity, distance, and size on character modeling characteristics was experimentally measured and comparatively analyzed. The experiment results show that good results can be obtained only when the intensity is 17% 25.5% in contrast to total brightness, distance is beyond 40cm, and the size is at least 20cm, to exhibit the optimum effect of underlight. This data will become material with high usage to gain smoother and cleaner s of characters in future high-quality s. Keyword : Underlight, Underlight light intensity, Underlight light distance, Underlight light size a) (KBS) b) IT(Dept. of Electronics IT Media Engineering, Seoul National University of Science and Technology) Corresponding Author : (Gooman Park) gmpark@seoultech.ac.kr Tel: ORCID: Manuscript received August 22, 2016; Revised September 19, 2016; Accepted September 19, 2016.

2 (JBE Vol. 21, No. 5, September 2016).. HDTV. (intensity). HDTV [1].... (key light), (fill light), (back light) 3 (three point lighting). 3,,. 3 (photogenic). 3,,,... (nose).. (under light).....,.,.,....

3 . (front light) 12.., [2]. (side light) 8 10, 2 4. (contrast). (back light) 12 ( ) ,. 1. Fig. 1. the overview and expression characteristics of the frontal direction of the light 2. Fig. 2. the overview and expression characteristics of the side direction of the light

4 (JBE Vol. 21, No. 5, September 2016) 3. Fig. 3. the overview and expression characteristics of the back direction of the light 4. Fig. 4. the overview and expression characteristics of the under direction of the light (silhouette),. (under light) 11 1, (scene) [6]...,,.,, 3.

.,,,.. 15 30 30 45 [4,5]..... 2. 1/3 1/2. (90 ).....,. 40 70.

5 .,,, [4,5] /3 1/2. (90 )....., only Key light only Fill light only back light K+F+B 5. 3 Fig. 5. the overview and expression characteristics of the three point lighting

6 (JBE Vol. 21, No. 5, September 2016) before under light under light setting after under light 6. Fig. 6. application case of under light.., HDTV ,,.., LED spotlight 7. Fig. 7. The overview and lighting equipment of the measurement system LED floodlight

7 .. LED 1, 250W. LED, 20W lux. 2. ( ) 470lux,,. Off On.. 50cm. 70cm 1 30cm (under light off). 8 (lux) Off.. On 40lux( 8 : 8.5%). () Off ( 8 ) 10IRE. 8 60lux 120lux( 8 ) Table 1. the measurement dimension data intensity (lux) 40(8.5%) 60(12.8%) 80(17%) 100(21.3%) 120(25.5%) 140(29.8%) 160(34%) distance (cm) x x x size (cm) x x

8 (JBE Vol. 21, No. 5, September 2016) under light off(only key light) 40 lux 60 lux 80 lux 100 lux 120 lux 140 lux 160 lux 8. Fig. 8. The intensity measurement of light of the under light (120lux= 25.5% )...

2. 9,,,.. 30cm., 20cm( 9 ).. 30cm, 50cm, 70cm( 9,, ),.. [3]... 3. 10,,,,.

9 2. 9,,,.. 30cm., 20cm( 9 ).. 30cm, 50cm, 70cm( 9,, ),.. [3] ,,,,. 50cm Fig. 9. the expression characteristics in the distance of the under light Fig. 10. the expression characteristics in the size of the under light

10 (JBE Vol. 21, No. 5, September 2016)... 10cm( 10 ) 15cm, 20cm,25cm,30cm ( 10 )...,, %. 80lux 120lux( 17% 25.5%).. 40cm. 20cm. 17% 25.5%, 40cm, 20cm. HD UHD... LED. LED. (reference) [1] J. M. Koo, Study of HDTV Picture Composition, The Graduate School of Media Communication Sogang University,pp6, June [2] Y. K. Kim, A Study on EffectS of Image Quality by DLP and LED Background in the Broadcasting Lighting, Department of Media Technology Seoul National Uniwersity of Technology, pp45-55, February [3] J. Y. LEE, Lux data for Broadcasting Image design, JBE, vol.14, no.3, pp89-92, September [4] H.S. Han, Case study of Lighting method to improve TV news viewers attention span, KSCI, vol.14, no69, pp97-111, December November [5] Ross Lowell, Matters of Light and Depth, Lowell-Light Manufacturing, New York, USA, pp43-49, 1992 [6] Y. J. Kim, Aesthetic Principles and Methods of Lighting, SEONG AN DANG Publishing CO. Mapo, Seoul, pp70-76, May 2014.

- - - IT - (KBS)TV ( ) - ORCID : http://orcid.

11 - - - IT - (KBS)TV ( ) - ORCID : - :, VR : : : : : IT : IT : Georgia Institute of Technology Dept.of ECE, - ORCID : - :,,

(JBE Vol. 21, No. 4, July 2016) (Regular Paper) 21 4, (JBE Vol. 21, No. 4, July 2016) ISSN

(JBE Vol. 21, No. 4, July 2016) (Regular Paper) 21 4, 2016 7 (JBE Vol. 21, No. 4, July 2016) http://dx.doi.org/10.5909/jbe.2016.21.4.538 ISSN 2287-9137 (Online) ISSN 1226-7953 (Print) LED a), b) A Study