Light pen - input and output devices, Computer Graphics

Assignment Help:

Light Pen - input and output devices

It is a pointing device. This has a light sensitive tip that is excited while the light is emitted and an illuminated point upon the display comes in its field of view. Different type of devices that have connected hardware to track the device and find out x and y values, the light pen requires software support as several kind of tracking program. Pointing operations are simply programmed for light pens.

2263_Light Pen - input and output devices.png

Figure: Light Pen Application

Figure in above shows two typical applications of a light pen. This has a light sensitive tip and also a photocell mounted in a pen-like case. Whether the light pen is pointed at an object on the screen this generates information from that the item can be identified through the program.

While the light pen senses an illuminated phosphor, this interrupts the display interpreting the processors of the file display. The instruction register of processor tells that instruction in the display file was being executed. Through identifying the instruction liable for the illuminated point that the machine can discover that object the pen is pointing to.

A light-pen is an event driven device. The processor that has to wait until it comes across an illuminated point on the display to acquire any information. The keyboard is the other typical illustration of an event driven device. Such processor has to wait for a key to be pressed before this can find out what the user needs to input.


Related Discussions:- Light pen - input and output devices

Clipping and 3d primitives, Clipping and 3D Primitives This unit introd...

Clipping and 3D Primitives This unit introduces you to three important concepts of Computer Graphics. After that discusses the concept of clipping, which means removal of objec

Zero acceleration (constant speed), Zero Acceleration (Constant Speed ) ...

Zero Acceleration (Constant Speed ) Now, the time spacing for the in-betweens that is: in-between frames is at equal interval; which is if, we want N in-betweens for key frames

Briefly explain types of animation, Question 1 Briefly explain types of an...

Question 1 Briefly explain types of animation Question 2 Briefly explain steps involved in animation process Question 3 What is Layout? Explain two types of layout

Hypertext/media and human memory, Hypertext/media and Human Memory Huma...

Hypertext/media and Human Memory Humans associate pieces of information along with other information and make complicated knowledge structures. Thus, this is also said as the h

Functions of hand-held pointer and tablet, The hand-held pointer and tablet...

The hand-held pointer and tablet in the form of a stylus i.e. pen or puck can function one or more of these three functions: (i)  For choosing positions on a drawing or on a men

File format-introduction to computer graphics, File format We want an i...

File format We want an image of a Fly. The wings are incompletely transparent and to present that in our presentation what be problematic if suitable file format is not there.

What is jpeg, Question 1 What is JPEG? How do you change the quality of a ...

Question 1 What is JPEG? How do you change the quality of a JPEG image? Question 2 What are the advantages and challenges of virtual classroom? Question 3 What do

Pcs or personal computers really - hardware for animation, PCs or Personal ...

PCs or Personal Computers Really - Hardware for Animation  these are really versatile machines that have been around for years. PCs are the favorite of many computer users, due

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd