Development and Comparison of Image Encoders Based on Different Compression Techniques

Abstract

In this project we present some of the most relevant image compression methods of the digital era. From lossless compression techniques like Laplacian Pyramid, to the current and frequently used lossy JPEG compression techniques, going through techniques that have been very influential in the past, as Fractal compression. The project is organized by chapters describing briefly the algorithms and presenting the results obtained when applied to three different test images. Finally we perform a comparative analysis synthesizing the main results. In this analysis we see the large difference in compression ratios between lossy and lossless compression algorithms. We also compare our developed lossy algorithms, observing that the first Fractal algorithm gives poor PSNR results, while our second Fractal algorithm and the JPEG algorithm give quite better qualities of compression; the latter achieving results comparable to present day JPEG algorithms