The F-transform preprocessing for JPEG strong compression of high-resolution images.

We are focused on improving the JPEG compression algorithm in the cases where a high ratio compression is required. For this purpose, we propose a preprocessing based on the F-transform. We develop a new discrete version of the inverse F-transform and new hybrid image compression and decompression algorithms, which combine JPEG with the F-transform. In the compression phase, JPEG follows the direct F-transform, while in the decompression phase, the methods are performed in the opposite order, and the new inverse F-transform is applied. We justify and illustrate on high-resolution benchmarks three main advantages of the proposed combination over the pure JPEG. We performed 504600 compressions using 15 different qualities, and for each selected quality it was confirmed that the proposed approach has compression 4 times stronger and the SSIM quality is 1.6 times higher than the pure JPEG. Finally, we propose an easy way to use the new compression software in the current JPEG standard. [ABSTRACT FROM AUTHOR]