Vocab_1
A base-16 number system that uses 16 distinct symbols, 0-9 and A-F, to represent numbers from 0-15.
What is Hexadecimal?
T or F: Text compression is when we increase the size of our messages to further clarify our intended message.
What is false?
An example of this type of compression is when a program uses an algorithm to identify frequencies and volume levels - low and high - that are outside the range of human hearing and remove the data representing these frequencies from the original.
What is lossy compression?
The decimal number 11 is this in the hexadecimal system
What is B?
The RGB value F00 (12-bits/pixel) would represent this color.
What is red?
This is the fundamental unit of a digital image, typically a tiny square or dot that contains a singe point of color of a larger image.
What is a pixel?
Each letter, space, and punctuation is a byte. What is the compression rate?
Original Text:
How are you today?
Compressed text:
How R U 2day?
What is 27.8%?
Original data: 00000000111111001110001111
Runlength code: 8, 6, 2, 3, 3, 4
This would be an example of what type of compression?
What is lossless compression?
The binary number 1111 is this in the hexadecimal system.
What is F?
The RGB value 0F0 (12-bits/pixel) would represent this color.
What is green?
This data describes other data; can be the size of an image, number of colors, resolution, etc.
What is metadata?
Original Text= 65 bytes
Compressed Text = 15 bytes
Dictionary = 12 bytes
What is the compression rate? (How much was the text compressed?)
What is 58.5% compression rate?
Solution: 1 - [ (CT + D)/ OT ] x 100%
Decompress the following message:
Sa^y_%^s_%a!e^s_by_the_%a!ore
sh = !
se = %
ll = ^
What is "sally sells seashells by the seashore"?
The binary number 1101 1101 0000 is this in the Hexadecimal system.
What is DD0?
The RGB value 00F (12-bits/pixel) would represent this color.
What is blue?
This is a problem solving approach (algorithm) used to find a satisfactory solution when an optimal/exact/perfect solution is impossible or impractical.
What is a heuristic?
A message has a 70% compression rate and contained 100 bytes in the original message. What is the size of the compressed message and the dictionary?
What is 30 bytes?
T/F: Lossless compression is always a better option because you get the original data back without losing any data.
What is false? Although it is necessary sometimes it is not always needed (in images and audio for example).
In the Hexadecimal number AD88 is this in the binary system.
What is 1010 1101 1000 1000?
The RGB value 000 (12-bits/pixel) would represent this color.
What is black?
This type of compression allows the original data to be perfectly reconstructed from the compressed data.
What is lossless compression?
The original size of a message was 1.25 kilobytes, and was compressed to 600 bytes, and had a dictionary that was 250 bytes. What was the compression rate for this message?
What is 32%?
Solution: 1 - [ (CM +D) / OM ] x 100%
@t# $p# $!ed a @! of $!led @pp#s
$=pi ! =ck
@=pe
#=er
What is "peter piper picked a peck of pickled peppers"?
The binary 101001011110 would be this in the hexadecimal system.
What is A5E?
The RGB value AA AA AA (24-bits/pixel) would represent this color.
What is gray?