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Questions and Answers
What is the original size in bytes of the string 'aaaaabbbbccddddd' when each character requires 1 byte?
16 bytes
How many bytes does the RLE coded string for 'aaaaabbbbccddddd' require?
8 bytes
Explain why RLE compression is ineffective for the string 'cdcdcdcdcd'.
RLE is ineffective because the characters do not repeat consecutively, leading to many individual entries.
What is the purpose of introducing a flag in RLE encoding?
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Calculate the percentage reduction in file size when using RLE on the 32-character string with and without a flag.
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How many bytes does the 8x8 grid representing the letter 'F' require in its RLE compressed format?
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What values are used to represent white and black squares in the RLE compressed format of the letter 'F'?
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In RLE, how is the string 'aaaaaaaaabab' represented with and without a flag?
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Study Notes
Run Length Encoding (RLE)
- RLE is used to compress data, especially text
- RLE reduces file size by storing repeating data as one value and the number of its repetitions
- Example: 'aaaaabbbbccddddd' would be coded as 5a, 4b, 2c, 5d
- This technique reduces storage space significantly, especially for data with long sequences of identical values
- A flag can be used to indicate a run of repeating data.
- This flag eliminates confusion when the code has single instances, or multiple instances that follow each other
- The flag is used as a marker for repeated data and can be any value that distinguishes it from the original data
RLE in Images
- RLE can be used for compressing images
- Black and white images can be compressed by encoding consecutive white (W) and black (B) pixels
- Example: A 8x8 grid image of the letter 'F' can be compressed from 64 bytes to 30 bytes, achieving a reduction of 53%
RLE Application in Colored Images
- RLE can be used for compressing images with multiple color values
- The RLE technique can be applied to encode specific color values and their repetitions in an image, reducing the size of the image file.
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Description
This quiz explores the concept of Run Length Encoding (RLE), a data compression technique primarily used for text and images. Learn how RLE effectively reduces file sizes by representing repeating values and discover its applications in black and white as well as colored images. Test your understanding of this essential method of data compression.
