What does ASCII stand for? Why was it developed?

## The acronym ASCII stands for American Standard Code for Information Interchange. The 7-hit ASCII code was developed so that there could be a standard method for communication with computers.

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By what four basic methods may computer graphics images be stored for extended period? Give an example of the type of storage medium that would be used

(1) Store image only (Video, tape, film).

(2) Store values in display memory "as is" hard disk, floppy disk, magnetic tape, paper tape, punched cards

(3) Store values in display memory in compressed format (hard disk, floppy disk, magnetic tape, pape tape, punched cards).

(4) Store image construction information (hard disk, floppy disk, magnetic tape, paper tape, punched cards).

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Why are most light pen systems designed to resolve area the size of a character or larger?

Light pen systems designed to resolve area the size of a character or larger :

While it i very easy to locate the byte of display memory a light pen is pointing to, it is difficult to locate the exact pixel.

Light pen systems also often require several passes of the electron beam in the same area as the pen to reduce the frequency of errors.

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Why won't a light pen work with a liquid crystal display(LCD)

A light pen work with a liquid crystal display(LCD) : 

An LCD does not need to be refreshed. Since the display is not, changed on a regular basis, there is nothing for the light pen to record. Furthermore, LCDs do not emit a brighter than usual(or darker than usual) burst the moment a pixel is turned on, so there is no way to distinguish which pixel is being race on and which pixel is already turned on.

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If an A/D converter has a sampling rate of 600Hz, what is the oerture time for the converter?

** The aperture time is defined as the reciprocal of the sampling rate.

a = aperture time = 1/s

                           = 1/600

Thus, the aperture time of the converter is 1/600 s.

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What are three quantization are graphics programmers generally concerned with?

Three quantization are graphics programmers generally concerned with :

Quantizing : Quantizing is the process of dividing an analog input signal into a string of discrete outputs, each of constant amplitude. There are three aspects of quantizing - 

1. Sampling rate : The number of samples per second.

2. Aperture time : The of the sampling rate , defined as the number of second per sample.

3.  Coding error (amplitude uncertainty) : The difference between the conditional signal y = f(t) and the quantized signal fig : (a). This difference is measured

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Explain what accuracy means as related input devices.

Accuracy means as related input devices :

Accuracy refers to the correctness of the data generated by the input device.

Example : If the true temperature were 72.0031 degrees, an accurate digital thermometer precise to one degree would read 72 degrees.

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