Patent ID: 8385639
Filing Date: 2013-02-26
Classification: G06T,H04N

Abstract:
1. A compressive coding device comprising: a discrimination section which discriminates whether or not three color components of pixel data rendered in a first color presentation are each ascribed to transparency control; a conversion section which converts the pixel data of the first color presentation not ascribed to the transparency control into pixel data of a second color presentation according to a mapping rule while converting the pixel data of the first color presentation ascribed to the transparency control into a predetermined value out of a mapping range according to the mapping rule, the pixel data converted into the predetermined value out of the mapping range being configured to not be displayed; and an irreversible compressive coding section which performs irreversible compressive coding on the converted pixel data output from the conversion section, thus producing compressive coded data, wherein at least one of the three color components of the converted pixel data is subjected to reversible compressive coding, while the other component(s) of the converted pixel data are subjected to the irreversible compressive coding, and wherein the irreversible compressive coding includes a reduction process for thinning out pixel data at a certain ratio and an expansion process for interpolating thinned out pixel data by use of pixel data that has not been thinned out with respect to the three color components of the converted pixel data.