• Journal of the Ergonomics Society of Korea
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• v.31 no.2
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• pp.309-317
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• 2012

Objective: The aim of this paper is to inquire into the influences form factors and control types affect a search time and comfort at list menu of full touch phone. Background: Various studies have been proceeded that are related to the optimum touch area for enhancing usability of control and legibility in mobile touch device. In the environment of list menu which is widely used to provide various information effectively, however, not only comprehensive consideration for legibility and control is to be seek but also research for control type which is to scroll a list. Method: This study executed form factor experiment to inquire into the influence that font size, height of row and fixed area affect searching time and comfort in the while information processing even if the information on the list is unsorted in alphabetical order. Among the result of form factor experiment, control type experiment was executed by selecting shortest performance time, highest legibility comfort and control comfort. Control type experiment was implemented to figure out the influence which existing flicking type, scrolling bar type, newly established button page type and button raw types affect performance time and subjective comfort depending on location of the information. Results: Font size 12pt, height of row 7mm and fixed area 15mm was shortest performance time and got highest comfort and legibility score in form factor experiment. A Button page which was newly proposed type was shortest performance time and got highest comprehensive comfort in control type experiment. Conclusion: Form factor experiment showed similar results with the study through reading a long passage of character or controlling a grid icon type. However, height of row turned out to affect not only touch area for control but also legibility by ruling space between the lines. Button page type which was newly proposed showed shortest performance time and got highest comprehensive comfort. Because Button page type needs few finger movements than other control types and implements search in the fixed form, unlikely other type which list keeps moving. Application: This study should be applied in deciding form factors and control type for scroll when designing a list menu of full touch phone.

• 한국HCI학회:학술대회논문집
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• 2007.02b
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• pp.226-232
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• 2007

모바일폰의 LCD 전면화 추세로 인해 터치스크린을 기반으로 하는 모바일폰이 컨셉폰의 형태로 선보여지고 있고, 부분적으로 터치스크린을 차용한 모바일폰이 국내, 국외에 출시되고 있다. 터치스크린은 간편하고 직관적인 조작감을 제공하며 유동적인 인터페이스를 가능하게 하는 장점이 있다. 그리고 이러한 터치스크린의 장점을 적극적으로 활용할 수 있도록 하는 진보된 인터랙션 스타일도 다양하게 제안되고 있다. 하지만 기존의 터치스크린 기반의 모바일폰은 스타일러스를 그대로 사용하듯, 제한적이고 전형적인 인터렉션만을 제공하고 있고, 제안된 진보된 인터렉션 스타일들도 터치스크린 기반의 모바일폰에 직접적으로 활용하기는 어려운 실정이다. 본 연구는 진보된 인터랙션 스타일 중에서, 원 포인팅과 2개 이상의 포인팅이 가능한 멀티 포인팅 인터랙션을 연구하여 터치스크린기반의 Full LCD 모바일폰에 적합한 인터랙션 스타일을 제안한다. 이를 위해, 인터랙션에 대한 문헌연구와 함께 터치스크린을 기반으로 하는 다양한 디지털기기를 검토해보고, 터치스크린에 적용 가능한 진보된 인터랙션 사례들을 조사하였다. 그 후 터치디스크린 기반의 디지털기기를 사용하는 사용자의 행태를 파악하기 위한 유저테스트 및 인터뷰를 실시하여, 터치스크린 기반의 모바일폰에서 구현되어야 할 상세 인터랙션 스타일을 도출하였다. 본 연구에서 제안된 인터랙션 스타일은 다양한 사용자 경험을 가능하게 하여 고기능, 고사양화 되어가는 모바일폰의 UI를 보다 효과적으로 사용하는데 도움을 줄 것으로 기대된다.

• Journal of IKEEE
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• v.13 no.4
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• pp.116-124
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• 2009

Recently the CPU performance of modem chipsets or multimedia processors of mobile phone is as high as notebook PC. That is why mobile phone has been emerged as a leading ICON on the convergence of consumer electronics. The various applications of mobile phone such as DMB, digital camera, video telephony and internet full browsing are servicing to consumers. To meet all the demands the image quality has been increasingly important. Mobile phone is a portable device which is widely using in both the indoor and outside environments, so it is needed to be overcome to deteriorate image quality depending on environmental light source. Furthermore touch window is popular on the mobile display panel and it makes contrast loss because of low transmittance of ITO film. This paper presents the image enhancement algorithm to be embedded on image enhancement SoC. In contrast enhancement, we propose Clipped histogram stretching method to make it adaptive with the input images, while S-shape curve and gain/offset method for the static application And CIELCh color space is used to sunlight readability enhancement by controlling the lightness and chroma components which is depended on the sensing value of light sensor. Finally the performance of proposed algorithm is evaluated by using histogram, RGB pixel distribution, entropy and dynamic range of resultant images. We expect that the proposed algorithm is suitable for image enhancement of embedded SoC system which is applicable for the small-sized mobile display.