This Java code demonstrates the core steps of the JPEG compression algorithm. It implements the Discrete Cosine Transform (DCT), quantization, zigzag scan, and a simplified entropy encoding. These are fundamental processes for compressing digital images, reducing file size by transforming and encoding image data.

This example provides an educational look at the key stages of JPEG compression.

Run-Length Encoding (RLE) is a basic form of data compression where consecutive characters (runs) are replaced with a single character followed by the count of repetitions. This simple technique is useful for compressing repetitive data.

This Java program demonstrates how to apply RLE to a line of text input by the user.