Patent ID: 8913840
Filing Date: 2014-12-16
Classification: G06T,H04N

Abstract:
1. An irreversible compression apparatus for irreversibly compressing image data, comprising: an irreversible compression control device for controlling the irreversible compression apparatus, based upon a curve representing a relationship between compression ratio of irreversible compression and image quality of image data that has been irreversibly compressed, in such a manner that the image will be irreversibly compressed at a compression ratio that will result in a desired image quality; an image quality calculating device for calculating the image quality of the image data irreversibly compressed under control exercised by said irreversible compression control device; a curve correcting device for correcting the curve so as to satisfy a relationship between the compression ratio, which is used in control of the irreversible compression apparatus by said irreversible compression control device, and the image quality calculated by said image quality calculating device; and a control device for controlling said irreversible compression control device, said image quality calculating device and said curve correcting device in such a manner that control by said irreversible compression control device, calculation of image quality by said image quality calculating device and correction of the curve by said curve correcting device are repeated until the image quality calculated by said image quality calculating device attains the desired image quality.