Light pen - input and output devices, Computer Graphics

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.

Posted Date: 4/2/2013 6:43:40 AM | Location : United States







Related Discussions:- Light pen - input and output devices, Assignment Help, Ask Question on Light pen - input and output devices, Get Answer, Expert's Help, Light pen - input and output devices Discussions

Write discussion on Light pen - input and output devices
Your posts are moderated
Related Questions
What are the features of Inkjet printers?  They can print 2 to 4 pages/minutes. Resolution is about 360d.p.i. Thus better print quality is achieved. The operating

Historical method - Oral tradition: Only the teacher was the source of information The teacher treated as a role model. The teacher was the main resource to meet indiv

What is character generation and explain it''s two method: 1> Bitmap method 2> outline method.


QUESTION You are employed as a graphics designer in an advertising agency and recently completed a brochure artwork for a client. You need to send the file for printing before

what is staircase appearance

Sub Classes of Orthographic Projection There are three ordinary sub-classes of Orthographic (axonometric) projections as: 1) Isometric: The direction of projection makes

Variation of Intensity - Modeling and Rendering According to the phong model the variation of Intensity (I) along with α (since I α cos n α) is: i) for shiny surface (

Introduction of Polygon Rendering and Ray Tracing Method Different type of sources of light and the reflections generated by the object in exposure of these sources. As an obje

Question 1 Discuss the overview of multimedia networks Question 2 Discuss the types of synchronization in multimedia system >> Basic synchronization issues Content R