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
There are mostly two kinds of Video Tele Conference systems: 1) Desktop systems are add-ons to normal PC's, transforming them in Video Tele Conference devices. A range of variou

Question: (a) Describe in details the meaning of the following terms often available in drawing tools: (i) Welding objects; (ii) Trimming objects; (iii) Intersecting obje

Cyrus Beck Algorithm - Line Clipping Algorithm Cyrus Beck Line clipping algorithm is actually, a parametric line-clipping algorithm. The term parametric means that we requi

To prove ‾P (1) = p n Solution : since in the above case we determine each term excluding B n,n (u) will have numerous of (1 - u) i (i = 0 to n) consequently by using u = 1

Digital video can be characterized by a few variables: Frame rate : various frames displayed per second. The illusion of motion may be experienced on frame rates as low as 12 f

pagemaker is a image editor

Question 1 Describe the process of formation of image in human eye Structure of the Human Eye Image formation in the Eye Brightness Adaptation and Discrimination

The RIA should consist of: i) A simple Graphical User Interface (GUI) constructed from a simple navigation system (comprising of around 5 key frames) making use of the Flash tim

Sequence of Steps to Generate a Full Animation The sequence of steps to generate a full animation would be as given below: 1)  Improve a script or story for the animation.

Consider a raster system with the resolution of 1024 x 768 pixels and the color palette calls for 65,536 colors. What is the minimum amount of video RAM that the computer must have