Gyropen is a technique to text entry input in the mobile phone using mobile phone corner.

1. “Gyropen : Gyroscopes for
Pen Input with Mobile
Phones”
Presented by-: Guided by-:
Dipak P. Jadhao Prof. V. P. Sawalkar
Late Purushottam Hari (Ganesh) Patil Shikshan Sanstha’s
Mauli Group of Institutions’,
College of Engineering & Technology, Shegaon. 444002
Department of Computer Science and Engineering.

2. Contents
• Introduction
• Sensor
• Literature survey
• What is Gyropen?
• User study
• Advantages
• Disadvantages
• Conclusion
• References

3. Introduction
 This technique is developed by Thomas Deselaers in
April 2015.
 GyroPen, a method that brings an experience similar
to “drawing with a pen” through mobile devices.
 The user can hold the mobile phone like a pen and
“write” on any surface.
 The trajectory of the phone’s “writing corner” is
reconstructed from the phone’s sensors: its
gyroscopes and accelerometers.

4.  Accelerometer sensor
 Gyroscope sensor
 Magnetometer sensor
Sensor

5. Literature survey
 The technique TiltText in which there are 12-
buttons and the text is predicted using the tilt
sensor.
 Shrimp technique which uses the phones camera
for text input.
 PhonePointPen and Airwriting methods developed
allow users to write in air and then detect the words
writing.
 In 1999 B. Miler proposed handwriting recognition
using acceleration
 Thomas Daser was also developed which was a
gesture- driven data entry method.

6. What is Gyropen?
 A technique is developed to take text input in mobile
phones in which user write on a surface using
phones corner.
 The motion of phone is detected using two approach
◦ Accelerometer Based.
◦ Gyroscope Based.
 This technique is Gyroscope-based approach.
Fig 1: GyroPen for text entry.

7. Gyroscope-based Approach
• Gyroscope is used to detect the movement.
• Gyroscope is used to measure rotation about its
own three axes.
• The gyroscope measures angular velocity in rad/s .
Fig 2: Measurement Done To Detect The

8. Contd..
Fig. 3.: Measurements from the gyroscope while performing different writing strokes.
(a) “left to right” (b) “right to left” (c) “bottom up” (d) “top down” (e) “circle” (f) “pen
up”.

9.  Initialization
The initial altitude is set and a number of times gravity is
measured using accelerometer to properly set the gravity and
initial altitude.
 Tracking Movement
The initial altitude is updated this update is done by
multiplying the initial altitude with the angle it is rotated which
include the angular velocity and the time taken for
measurement the measurement are obtained using the
gyroscope.
 New-word heuristic
A 7x5 cm box is provided which is sufficient for writing.
The hand can remain at the same spot while writing multiple
words (or word-parts) on top of each other, when the end of a
word is reached the user lifts the writing corner, moves it to the
left, and then writes the next word over the previous one.
The steps to detect the movement

10. Contd.
 Post processing
Post processing steps are done to get the writing path
and also minimize the variations occur in handwriting when
writing with the phones corner and that writing with the pen.
 Handwriting Recognition
To recognize the written items, we use an online
handwriting recognition system.
Image acquisition
Preprocessing
Segmentation
Post processing
Fig. :- Proposed system of Online-Handwriting

11. Fig. 4:- Average CER for the ten trials of writing the 52 words
User study

12. Advantages
 It works on smart phones without any modification
to the hardware.
 There is no need of external devices.
 No need of external sensor.
 It has also overcome the problem of pen up stoke.

13. Disadvantages
 Not comfortable for large size smartphone
 Mixing input signal is so confusion.
 If the writing surface is irregular then problem occur
in tracking movement.

14. Conclusion
GyroPen technology introduced recently which prove
to be an effective medium of text input in mobile
phones. It can be very useful for people having
difficulty in typing and for people knowing there
regional language only can easily write like a pen. It
has also overcome the problem of pen up stoke and
can be used without any modification to the hardware
in modern smart phones.

15. References
[1] Dale L Grover, Martin T King, and Clifford A Kushler, “Reduced
keyboard disambiguation system”, US Patent 5,818,437, 1998.
[2] Thomas Deselaers, Daniel Keysers, Jan Hosang, and Henry A.
Rowley, “GyroPen: Gyroscopes for Pen-InputWith Mobile Phones”
IEEE Transactions On Human-Machine Systems : 2014
[3] B. Milner, “Handwriting recognition using acceleration-based motion
detection”, in IEE Colloquium on Document Image Processing and
Multimedia, 1999, pp. 5/1–5/6.
[4] Daniel Wigdor and Ravin Balakrishnan, “TiltText: using tilt for text
input to mobile phones”, in UIST, 2003.
[5] J. S. Wang, Y. L. Hsu, and J. N. Liu, “An inertial measurement-unit-
based pen with a trajectory reconstruction algorithm and its applications,
” IEEE Trans. Industrial Electronics, vol. 57, no. 10, pp. 3508- 3521,
2010
[6] https://www.youtube.com/watch?v=tx6t5cGOpac

16. Thank
you..!!
Any queries..??