Hiroe Li | University of British Columbia (original) (raw)
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Papers by Hiroe Li
Sixty-three participants (range from 18 to 85 years of age) completed 4 data entry tasks on an HP... more Sixty-three participants (range from 18 to 85 years of age) completed 4 data entry tasks on an HP iPAQ 5450 via a touch-screen QWERTY keyboard, as well as a battery of neuro-cognitive tests. Entry errors and assistance required by participants were coded into categories. Multiple regression analyses revealed that episodic memory was the strongest predictor for stand-still errors and commission errors, while sensory abilities was the strongest predictor of omission errors. We suggest that raining sessions that familiarize older adults with the functions of specific keys (e.g. Spacebar and Backspace) and structure of the keyboard, complemented with visual or auditory feedback provided by the keyboard as methods to improve text entry accuracy.
IEEE/OSA Journal of Display Technology, 2008
DICOM specifies that digital data values should be linearly mapped to just-noticable differences ... more DICOM specifies that digital data values should be linearly mapped to just-noticable differences (JNDs) in luminance. Increasing the number of JNDs available requires increasing the display's dynamic range. However, operating over too wide a range may cause human observers to miss contrast in dark regions due to adaptation to bright areas or, alternatively, miss edges in bright regions due to scattering in the eye. Dolby Inc.'s high dynamic range (HDR) LCD display has a maximum luminance over 2000 cd/m 2 ; bright enough to produce significant in-eye scatter. The display combines a spatially variable backlight producing a low-resolution 8-bit "backlight image" with a high-resolution 8-bit LCD panel, approximating a 16-bit greyscale display. Alternatively, by holding the backlight constant at 800 cd/m 2 , a standard medical LCD display can be simulated.
Recent high dynamic range (HDR) display devices provide significantly greater output brightness a... more Recent high dynamic range (HDR) display devices provide significantly greater output brightness and dynamic range compared to conventional display technology. A possible concern for the extended use of HDR displays is the potential to cause visual fatigue. Furthermore, ambient illumination has a significant effect on the perception of the imagery displayed, and its impact on user preferences for brightness and contrast must be understood.
Sid Symposium Digest of Technical Papers, 2006
Luminance, contrast ratio and amplitude resolution are rapidly growing display specifications. Th... more Luminance, contrast ratio and amplitude resolution are rapidly growing display specifications. Through a series of human factor studies we have developed simple guidelines for these specifications including viewer preference for luminance, optimal contrast ratio and amplitude resolution under realistic conditions.
Sixty-three participants (range from 18 to 85 years of age) completed 4 data entry tasks on an HP... more Sixty-three participants (range from 18 to 85 years of age) completed 4 data entry tasks on an HP iPAQ 5450 via a touch-screen QWERTY keyboard, as well as a battery of neuro-cognitive tests. Entry errors and assistance required by participants were coded into categories. Multiple regression analyses revealed that episodic memory was the strongest predictor for stand-still errors and commission errors, while sensory abilities was the strongest predictor of omission errors. We suggest that raining sessions that familiarize older adults with the functions of specific keys (e.g. Spacebar and Backspace) and structure of the keyboard, complemented with visual or auditory feedback provided by the keyboard as methods to improve text entry accuracy.
IEEE/OSA Journal of Display Technology, 2008
DICOM specifies that digital data values should be linearly mapped to just-noticable differences ... more DICOM specifies that digital data values should be linearly mapped to just-noticable differences (JNDs) in luminance. Increasing the number of JNDs available requires increasing the display's dynamic range. However, operating over too wide a range may cause human observers to miss contrast in dark regions due to adaptation to bright areas or, alternatively, miss edges in bright regions due to scattering in the eye. Dolby Inc.'s high dynamic range (HDR) LCD display has a maximum luminance over 2000 cd/m 2 ; bright enough to produce significant in-eye scatter. The display combines a spatially variable backlight producing a low-resolution 8-bit "backlight image" with a high-resolution 8-bit LCD panel, approximating a 16-bit greyscale display. Alternatively, by holding the backlight constant at 800 cd/m 2 , a standard medical LCD display can be simulated.
Recent high dynamic range (HDR) display devices provide significantly greater output brightness a... more Recent high dynamic range (HDR) display devices provide significantly greater output brightness and dynamic range compared to conventional display technology. A possible concern for the extended use of HDR displays is the potential to cause visual fatigue. Furthermore, ambient illumination has a significant effect on the perception of the imagery displayed, and its impact on user preferences for brightness and contrast must be understood.
Sid Symposium Digest of Technical Papers, 2006
Luminance, contrast ratio and amplitude resolution are rapidly growing display specifications. Th... more Luminance, contrast ratio and amplitude resolution are rapidly growing display specifications. Through a series of human factor studies we have developed simple guidelines for these specifications including viewer preference for luminance, optimal contrast ratio and amplitude resolution under realistic conditions.