Compression Techniques Quiz

What is lossy compression?

• A type of compression that does not lose any data.

• A type of compression that results in a loss of data.

• A type of compression that increases the size of data.

• A type of compression that only affects video files.

Which of the following is an example of a file type that uses lossy compression?

• PNG

• ZIP

• MP3

• TXT

What is lossless compression?

• A type of compression that results in a loss of data.

• A type of compression that only affects audio files.

• A type of compression that does not lose any data.

• A type of compression that increases the size of data.

What is Run length encoding?

• A type of lossy compression.

• A method for finding patterns in text.

• A common type of lossless compression.

• A technique for increasing file size.

How does Run length encoding work?

• By finding 'runs' of repeated bit patterns and replacing them with a double instance of the pattern.

• By finding 'runs' of repeated bit patterns and replacing them with a single instance of the pattern and a number that specifies how many times the pattern is not repeated.

• By encrypting the data using a special algorithm.

• By finding 'runs' of repeated bit patterns and replacing them with a single instance of the pattern and a number that specifies how many times the pattern is repeated.

In run length encoding, how are black pixels represented?

• A) 10

• B) 01

• C) 00

• D) 11

In run length encoding, how are white pixels represented?

• A) 00

• B) 10

• C) 01

• D) 11

What is the run length encoding representation for the top row of the bitmap image provided?

• A) 00 00 00 11

• B) 11 11 11 00

• C) 00 11 00 11

• D) 11 00 11 00

What is the first step in run length encoding on a bitmap file?

• Create a data pairing showing the number of occurrences and the bit pattern

• Count the number of matching bit patterns in that run

• Identify a run of bit patterns (pixels)

• Compress the file using a standard compression algorithm

What do you do after identifying a run of bit patterns in run length encoding?

• Immediately compress the file

• Count the number of matching bit patterns in that run

• Create a data pairing showing the number of occurrences and the bit pattern

• Encrypt the data for security