bezztrátová

Bezztrátová refers to a type of data compression that allows the original data to be perfectly reconstructed from the compressed data. This is in contrast to lossy compression, where some information is discarded during the compression process to achieve smaller file sizes, and the original data cannot be fully recovered.

Lossless compression algorithms work by identifying and eliminating statistical redundancy in the data. Common techniques include run-length encoding, where sequences of identical data are replaced by a count and a single value, and Huffman coding, which assigns shorter codes to more frequent data symbols and longer codes to less frequent ones. Other methods like Lempel-Ziv variations (LZ77, LZ78, LZW) are also widely used.

The primary advantage of bezztrátová compression is the preservation of data integrity. This makes it essential for applications where accuracy is paramount, such as text documents, executable programs, source code, and medical images. For example, compressing a text file using a lossless method ensures that every character remains exactly as it was in the original file.

While bezztrátová compression achieves perfect reconstruction, it typically results in lower compression ratios compared to lossy methods. The effectiveness of lossless compression depends heavily on the nature of the data; data with high redundancy, like plain text or uncompressed images, compresses well, whereas already compressed or random data may not be significantly reduced in size. Popular file formats that utilize bezztrátová compression include ZIP, PNG, FLAC, and GIF.