Toward the reduction of incorrect drawn ink retrieval

Atsushi Kitani,Takako Nakatani,Taketo Kimura

doi:10.1186/s13673-017-0099-0

Atsushi Kitani, Takako Nakatani + Show 1 more

Open Access

https://doi.org/10.1186/s13673-017-0099-0

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Abstract

As tablet devices become popular, various handwriting applications are used. Some of applications incorporate a specific function, which is generally called palm rejection. Palm rejection enables application users to put the palm of a writing hand onto a touch display. It classifies intended touches and unintended touches so that it prevents accidental inking, which has been known to occur under the writing hand. Though some of palm rejections can remove accidental inking afterward, this function occasionally does not execute correctly as it may remove rather correct ink strokes as well. We call this interaction Incorrect Drawn Ink Retrieval (IDIR). In this paper, we propose a software algorithm that is a combination of two palm rejection logics that reduces IDIR with precision and without latency. That algorithm does not depend on specific hardware, such as an active stylus pen. Our data provides 98.98% correctness and the algorithm takes less than 10 ms for the distinction. We confirm that our experimental application reduced the occurrences of IDIR throughout an experiment.

Highlights

As tablet devices are widespread, various handwriting applications have been and continue to be developed
We propose a software algorithm that is a combination of two palm rejection logics that reduces Incorrect Drawn Ink Retrieval (IDIR) with precision and without latency
When a user tries to write something on a tablet with a general handwriting application, a multi-touch interaction compels the user to float the hand above the display to avoid accidental inking

Summary

Introduction

As tablet devices are widespread, various handwriting applications have been and continue to be developed. When a user tries to write something on a tablet with a general handwriting application, a multi-touch interaction compels the user to float the hand above the display to avoid accidental inking. Since this unnatural way of writing produces difficulties [1] for digital handwriting applications, the function called “palm rejection” becomes crucial. When palm rejection correctly distinguishes an intended touch, it results in the True Positive and the touch draws a correct ink stroke. On the other hand, when an unintended touch is recognized as an intended touch, it is the False Positive and accidental inking occurs. When an intended touch cannot be recognized correctly, the touch is the False Negative and it is incorrectly rejected

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