Digitizer Technology: Performance Characteristics and the Effects on the User Interface

Ward, Jean Renard; Phillips, Mark J

doi:10.1109/mcg.1987.276869

Cited by 18 publications

(12 citation statements)

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“…It's like I'm looking for the cursor instead of just assuming that I'm clicking on the right place, so it is a little bit slower than normal. Participants also encountered problems with visual parallax, which made selecting targets difficult at the extreme top of the tablet, supporting the arguments of Ward and Phillips (1987) and :…”

Section: Pen Tapping Stabilitysupporting

confidence: 56%

“…In the same way that hardware sensitivity is likely contributing to the number of missed clicks, other hardware problems such as lag and parallax (Ward & Phillips, 1987) also affect performance. When using a pen, any lag or parallax seems to have an amplified effect, as the visual feedback and input are coincident.…”

Section: Downloaded By [University Of Maryland] At 01:20 14 October 2014mentioning

confidence: 99%

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Direct Pen Interaction With a Conventional Graphical User Interface

Vogel¹,

Balakrishnan²

2010

Human-Comp. Interaction

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We examine the usability and performance of Tablet PC direct pen input with a conventional graphical user interface (GUI). We use a qualitative observational study design with 16 participants divided into 4 groups: 1 mouse group for a baseline control and 3 Tablet PC groups recruited according to their level of experience. The study uses a scripted scenario of realistic tasks and popular office applications designed to exercise standard GUI components and cover typical interactions such as parameter selection, object manipulation, text selection, and ink annotation. We capture a rich set of logging data including 3D motion capture, video taken from the participants' point-of-view, screen capture video, and pen events such as movement and taps. To synchronize, segment, and annotate these logs, we used our own custom analysis software.We find that pen participants make more errors, perform inefficient movements, and express frustration during many tasks. Our observations reveal overarching problems with direct pen input: poor precision when tapping and dragging, errors caused by hand occlusion, instability and fatigue due to ergonomics and reach, cognitive differences between pen and mouse usage, and frustration due to limited input capabilities. We believe these to be the primary causes of nontext errors, which contribute to user frustration when using a pen with a conventional GUI. Finally, we discuss how researchers could address these issues without sacrificing the consistency of current GUIs and applications by making improvements at three levels: hardware, base interaction, and widget behavior.

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Section: Pen Tapping Stabilitysupporting

confidence: 56%

Section: Downloaded By [University Of Maryland] At 01:20 14 October 2014mentioning

confidence: 99%

Direct Pen Interaction With a Conventional Graphical User Interface

Vogel¹,

Balakrishnan²

2010

Human-Comp. Interaction

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“…Pen occlusion and parallax have been reported as major defects of direct pen input [6,7,18,26,29,30], but few directly solved the problems. Along with these problems, hidden pen information has also been a problem when drawing.…”

Section: Problems Of Direct Pen Inputmentioning

confidence: 99%

PhantomPen

Lee

Son

Lee

et al. 2012

Proceedings of the 25th Annual ACM Symposium on User Interface Software and Technology

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Figure 1: Problems of direct pen input: (a) pen occlusion that covers portions of drawing, (b) visual parallax between a physical pen tip and mouse cursor due to display glass thickness, and (c) hidden pen information such as pen type, color, and thickness, which is not intuitively perceived on the digital canvas. PhantomPen solves these problems by replacing the physical pen head with a virtual pen displayed as if connected to the pen barrel from the user's perspective (d), while an actual pen tip, hidden by the pen barrel, delivers tactile feedback (e). ABSTRACTWe present PhantomPen, a direct pen input device whose pen head is virtualized onto the tablet display surface and visually connected to a graspable pen barrel in order to achieve digital drawing free from pen occlusion and visual parallax. As the pen barrel approaches the display, the virtual pen head smoothly appears as if the rendered virtual pen head and the physical pen barrel are in unity. The virtual pen head provides visual feedback by changing its virtual form according to pen type, color, and thickness while the physical pen tip, hidden in the user's sight, provides tactile feedback. Three experiments were carefully designed based on an analysis of drawings by design professionals and observations of design drawing classes.With these experiments that simulate natural drawing we proved significant performance advantages of Phan-tomPen. PhantomPen was at least as usable as the normal stylus in basic line drawing, and was 17 % faster in focus region drawing (26 % faster in extreme focus region drawing). PhantomPen also reduced error rate by 40 % in a typical drawing setup where users have to manage a complex combination of pen and stroke properties.

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“…Similarly, for linear scale applications, Y i may be determined using equation (4) and for logarithmic data transformation equation (5) should be used. On completion of the conversion, the digitized curve data will be immediately stored in the PC memory.…”

Section: Data Transformationmentioning

confidence: 99%

“…From the measuring data, many useful parameters to represent the speciality of a biological shape can be analysed such as area, perimeter, maximum diameter, minimum diameter, mean diameter, major axis, minor axis, form factor and so forth [1,2]. There are several types of tablet digitizers which have been developed and are currently available in the market [3,4]. Most digitizers employ the same basic principles such as magnetic sensing and phase-encoding detection methods to trace and digitize the data curve as well as to send data into a microcomputer via a serial I/O port (RS-232) for data collection.…”

Section: Introductionmentioning

confidence: 99%

Backward Terahertz Generation in Periodically Poled Lithium Niobate Crystal via Difference Frequency Generation

Jung

Kee

et al. 2007

jjap

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A simple digitizer with utilizes a piece of touch panel position sensor (TPPS) material and a homemade control board has been developed for semi-automatic quantitative morphometry. The profile areas were digitized by tracing with a freehand drawing and the raw data were then stored in a personal computer (PC) for further processing. This is an extremely useful tool for digitizing and converting graphic data from previously published data for comparison and/or processing of new physical parameters. Sequential architecture of hardware and software components for control and data acquisition are described and discussed in this paper. The resolution and accuracy of this PC-based digitizer are also characterized and discussed.

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Digitizer Technology: Performance Characteristics and the Effects on the User Interface

Cited by 18 publications

References 1 publication

Direct Pen Interaction With a Conventional Graphical User Interface

Direct Pen Interaction With a Conventional Graphical User Interface

PhantomPen

Backward Terahertz Generation in Periodically Poled Lithium Niobate Crystal via Difference Frequency Generation

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