Patent ID: 8467619
Filing Date: 2013-06-18
Classification: G06F,H04N

Abstract:
1. An image compressing apparatus for compressing image data that has pixel data for each pixel, comprising: a data generation unit configured to generate a plurality of second pixel data groups by dividing a first pixel data group including a plurality of pixels existing in block that divides an image; a first transforming unit configured to perform an orthogonal transformation for each of the second pixel data group generated by the data generation unit, and outputting a plurality of coefficients that represent frequency components; a second transforming unit configured to perform an orthogonal transformation using a predetermined number of coefficients from a lowest frequency side from among the plurality of coefficients obtained by the orthogonal transformation for each piece of the second pixel data group performed by the first transforming unit; and an encoding unit configured to generate compressed data from coefficients outputted by the second transforming unit and coefficients not used by the second transforming unit for the orthogonal transformation from among coefficients outputted by the first transforming unit.