Patent ID: 7602538
Filing Date: 2009-10-13
Classification: G06T

Abstract:
1. An image data processing method for implementing a gradation adjustment to a restored image data file obtained by restoring a compressed image data file comprising the steps of: determining whether to perform a gradation hardening operation or a gradation softening operation for said gradation adjustment; and performing said gradation adjustment; wherein said gradation hardening operation comprises the steps of splitting said restored image data file into a low-frequency component and a component other than said low-frequency component; performing said gradation hardening operation for said low-frequency component to obtain a gradation-corrected low-frequency component; and combining said gradation-corrected low-frequency component with the component other than said low-frequency component; and said gradation softening operation comprises the step of performing said gradation softening operation over the entire portion of said restored image data file.