Key features ! Form factor Tablet PC ! Size ! Mobility ! Pen Input - PDF document

Key features ! Form factor Tablet PC ! Size ! Mobility ! Pen Input CSE 490 RA ! Natural Ink ! Stand Alone ! General Purpose Tablet PC Hardware Tablet PC History Requirements ! GRiDPad 1989 ! Digitizer ! Go Pen point 1991 ! Detect Hovering Pen ! Sample at least 100 times per second ! Pen Windows 1992 ! Support resolution of 600 dpi ! Newton 1993 ! Two second resume from standby ! Palm Pilot 1996 ! Landscape to portrait without reboot ! Ctrl-alt-del without keyboard Why might pen computing succeed? TPC Software ! Dramatic changes in hardware ! Digital Ink Applications ! Digitizers ! Ink SDK ! CPU Speeds ! Tablet Input Panel ! Batteries ! Computing without the keyboard ! Digital Ink Recognition ! Extension of Windows XP ! This presentation was created without a keyboard on a turbulent airplane ! Must run windows apps ! Digital Ink treated as first class type 1

Hardware landscape Usability Studies ! Many vendors ! Pen UI vs. Conventional Widows UI ! Range of form factors ! Ink as ink ! What about the keyboard? ! User studies showed that often users do not convert to handwriting ! Laptop plus vs. slate ! Visual distinction for inkable regions ! Convertible ! Input Modality ! Acer, Toshiba ! Detachable keyboard ! Do actions charge based on state ! HP/Compaq, motion computing ! Many believe modeless UI’s are desirable Digitizer issues Pen usability ! Digitizer types ! Targeting ! MS determined that .5cm is minimum ! Resistive, single or double layer ! Many controls are smaller ! Electro–static ! Domains with much larger targeting range ! Electro-magnetic ! Walking or talking ! Digitizer distortion ! Bumpy airplane Double click ! Parallax ! ! Tap without drag ! Hovering Pen Types Handedness ! Magnetic or Battery powered ! Users hand blocks menu/cursor ! May have button ! Left vs. Right ! Some active at both ends ! Tablet PC controls take handedness into account ! Supports natural eraser metaphor ! Control Panel /Tablet and Pen settings / ! settings 2

Pen Actions Gestures ! Control actions associated with pen ! Hover ! Drag movements ! Tap ! Hold-Drag ! InkCollector / InkOverlay provide ! Double Tap ! Lasso gesture support ! Press and Hold ! Gesture ! Recognized gestures fire event ! Hold through ! Issues / risks ! Hard to learn (as keyboard shortcuts) ! Serious problem in accidental triggering 3