Flashcards in Data Representation Deck (25)

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1

## What is the only type of data the CPU can store and process?

### Binary

2

## Why is it important for us to have a universal text system?

###
To allow all computers to use the same codes to represent the same characters

Only have to learn one code to work on many computers

3

## Give an example of a ASCII code and what it represents

###
65 = A

97 = a

etc

4

##
Give an advantage of

a) Unicode compared to ASCII

b) ASCII compared to Unicode

###
a) Larger range of characters can be represented

b) Smaller storage requirements

5

## Describe ASCII

### ASCII(American Standard Code for Information Interchange) is a system used to represent characters. It stores each character in 8 bit code.

6

## Why do computers use base 2 instead of base 10?

###
Base 2 is ideal for storing binary numbers

Base 10 requires a lot of processor space to build in rules for arithmetic such as addition,subtraction

7

## How are integers stored in a computer?

### Each integer has an individual binary number.

8

## How many values can be represented by 5 bits?

### 2^5

9

## What is the range of values that can be stored in 18 bit?

### 0 to 2^18 - 1

10

## How can negative integers be represented on a computer system?

### Two's complement

11

## How do you represent floating point numbers in a computing system?

### Floating Point Form

12

##
If you allocate more bits to storing the* mantissa ** of a floating point number, what will happen?*

*of a floating point number, what will happen?*

### The precision of the number will increase

13

## How would you increase the range of a floating point number?

### Allocate more bits to the storage of the exponent

14

## Describe a bit-map image

### A bit-map image is where the image is stored as a 2D array of pixels where each pixel can be individually edited. The colours in the picture are each a unique binary number.

15

## What is the definition of 'bit depth'

### Bit depth is the number of bits used to store each pixel

16

##
If you increase the *resolution* of a picture, what are you increasing?

### The number of pixels in a defined place

17

## What is an advantage of storing your image as a bitmap rather than a vector?

###

- Able to individually edit pixels

- Able to do red eye removal

18

## Describe how images are stored as vector images

### In vector images, the image is stored as a series of vectors which describe the attributes of the objects in the image. For example, the vectors of a circle could relate to fill colour, line thickness, radius, centre(x,y) etc

19

##
If the bit depth is represented by **n** , what would be the number of colours?

### 2^n

20

## Describe advantages of storing your image as a vector rather than a bitmapped image

###

- Able to layer objects

- Able to resize and rotate individual objects

- Resolution Independant

21

## What are advantages to compressing your images?

###

- Faster file transfer speed

- Less memory required to store images

22

## Give an example of a file type that uses lossy compression

###
JPEG

MP3

23

## Give an example of a file type that uses lossless compression

### GIF

24

## Describe how Discrete Cosine Technique reduces file size and state what type of compression it is

###
Discrete Cosine Technique is a LOSSY compression technique that **applies a mathematical formula ** based on the cosine wave to groups of ** 64 **pixels (8 x 8)

25