This core implements the QOI lossless image compression algorithm decompressing QOI header-less files and producing RGB 24 bits pixels. Simple, fully synchronous design with low gate count.
OL_QOID is a fast, low complexity implementation of the compression algorithm that decompresses one 24 bits RGB pixel per clock cycle.
The QOI Lossless Image Compression Algorithm
QOI stands for Quite OK Image Format and it is a fast, simple lossless image compression algorithm.
As it can be seen in these benchmarks, the performance of the algorithm is usually somewhere in between two well known image compression libraries (like libpng and stb) but at a much lower computational cost.
QOI uses a combination of some well known image compression techniques and innovative ideas.
Pixels are compressed as:
- runs of identical pixels
- an index to a 64 pixel cache of previously encountered pixels
- a difference to the previous pixel
- a full RGB pixel
The QOI algorithm is an excellent compromise between compression performance and low algorithmic complexity.
