| US 7,602,538 B2 | ||
| Method and apparatus for image data processing | ||
| Makoto Kagaya, Kaisei-machi (Japan) | ||
| Assigned to FUJIFILM Corporation, Tokyo (Japan) | ||
| Filed on Jun. 20, 2003, as Appl. No. 10/465,660. | ||
| Claims priority of application No. 2002-184447 (JP), filed on Jun. 25, 2002. | ||
| Prior Publication US 2003/0235343 A1, Dec. 25, 2003 | ||
| Int. Cl. G06K 15/00 (2006.01) | ||
| U.S. Cl. 358—521 [358/520; 358/3.27; 382/166; 382/167] | 4 Claims |
| 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.
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