일일결과물 [개인 일일 결과물] Graphic tablets

[김미르]

일일 결과물	조 : 2조
	조장 : 블라디미르
	조원 : 박노진, 김윤환, 신배호, 미스토시
주제 : Graphic tablets
작성일 : 20101123	작성자 : 블라디미르

Today I have made a research about Graphics Tablets because we are thinking as a second project idea the TRADITIONAL CHINESE CHARACTERS LEARNING PROJECT where the input will be performed through a graphic tablet, reason why we had to know more about it and I did this research.

Graphics tablets

 

1- Over view

A graphic tablet is a computer input device that allows one to hand-draw images and graphics, similar to the way one draws images with a pencil and paper. These tablets may also be used to capture data or handwritten signatures. It can also be used to trace an image from a piece of paper which is taped or otherwise secured to the surface. Capturing data in this way either by tracing or entering the corners of linear poly-lines or shapes is called digitizing.

2- Background

The first electronic handwriting tablet was the Telautograph, patented by Elisha Gray in 1888. The first graphics tablet resembling contemporary tablets and used for handwriting recognition by a computer was the Stylator in 1957.

There have been many attempts to categorize the technologies that have been used for graphics tablets, some of which are listed below:

3- Technology & Operation

Passive Tablets

         Passive tablets, most notably those by Wacom, make use of electromagnetic induction technology, where the horizontal and vertical wires of the tablet operate both transmitting and receiving coils. The tablet generates an electromagnetic signal, which is received by the LC circuit in the stylus.

Active Tablets

Active tablets differ in that the stylus used contains self-powered electronics that generate and transmit signal to the table. These styli rely on an internal battery rather than the tablet for their power, resulting in a bulkier stylus.

Optical Tablet

Optical tablets operate by a very small digital camera in the stylus, and the doing pattern matching on the image of the paper.

Acoustic Tablets

Early models were described as spark tablets, a small sound generator was mounted in the stylus, and the acoustic signal picked up by two microphones placed near the writing surface.

Electromagnetic Tablets

Wacom’s are one example of a graphics tablet that works by generating and detecting an electromagnetic signal: in the Wacom design, the signal is generated by the pen, and detected by a grid of wires in the tablet. Other designs such as those by Pencept generate a signal in the grid of wires in the tablet, and detect it in the pen.

Capacitive Tablets

These tablets have also been designed to use an electrostatic or capacitive signal. Unlike the type of capacitive design used for touchscreens, the Scriptel design is able to detect the position of the pen while it is in a proximity to, or hovering above, the tablet.

4- General uses

Graphics tablets, because of their stylus-based interface and ability to detect some or all of pressure, tilt and other attributes of the stylus and its interaction with the tablet, are widely considered to offer a very natural way to create computer graphics, especially two-dimensional computer graphics. On the other hand in East Asia, graphics tablets, or pen tablets as they are known, are widely used in conjunction with input method editor software (IMEs) to write Chinese, Japanese or Korean characters (CJK). It is also used in so many other areas such as graphic design and so on.

5- A solution for injuries

Advocates of tablets and pens cite relief from occupational overuse syndrome varieties such as repetitive strain injury. Sufferers of carpal tunnel syndrome also report good results. This is because the use of a computer mouse tends to be very repetitive on the wrist, whereas operation a pen is more natural and tends to involve the movement to the entire arm.