The Lenna (or Lena) picture is one of the most widely used standard test images used for compression algorithms.'lena' or 'lenna' is a digitized Playboy centerfold, from November 1972. (Lenna is the spelling in Playboy, Lena is the Swedish spelling of the name.) Lena Soderberg (ne Sjööblom)
The Portable Network Graphics (PNG) is a format for storing compressed raster graphics. The compression engine is based on the Deflate method [RFC1951], designed by PKWare and originally used in PKZIP.
a different approach to image optimization, based on how image data is stored in different formats. Let’s start with the JPEG format and a simple technique called the eight-pixel grid.
N. Tishby, and N. Zaslavsky. (2015)cite arxiv:1503.02406Comment: 5 pages, 2 figures, Invited paper to ITW 2015; 2015 IEEE Information Theory Workshop (ITW) (IEEE ITW 2015).
M. Rosvall, and C. Bergstrom. (2007)cite arxiv:0707.0609Comment: 7 pages and 4 figures plus supporting material. For associated source code, see http://www.tp.umu.se/~rosvall/.