Compression: Crash Course Computer Science #21

Introduction to Compression00:00:03

Files are often inefficiently stored; compression reduces file size by encoding data using fewer bits, which saves storage space and speeds up transmission.

Lossless Compression Techniques00:01:48

Lossless compression allows for perfect data reconstruction. Methods include Run-Length Encoding to replace repeating values and Huffman Coding, which uses frequency-based trees to assign compact, unique codes to data blocks.

Lossy Compression and Perceptual Coding00:06:23

Lossy compression discards data that is less perceptible to human senses, such as ultrasonic sound frequencies or subtle color variations in images, achieving significantly smaller file sizes.

Video Compression00:09:27

Video compression leverages temporal redundancy, identifying identical background pixels or moving objects across frames to encode only necessary differences, allowing for efficient streaming.