| US 7,548,640 B2 | ||
| Method and apparatus for calibration and correction of gray levels in images | ||
| Fanny Jeunehomme, Versailles (France); Serge Muller, Guyancourt (France); and Razvan Iordache, Paris (France) | ||
| Assigned to GE Medical Systems Global Technology Company, LLC, Waukesha, Wis. (US) | ||
| Filed on May 06, 2008, as Appl. No. 12/115,596. | ||
| Application 12/115596 is a continuation of application No. 10/775912, filed on Feb. 10, 2004, abandoned. | ||
| Claims priority of application No. 03 01797 (FR), filed on Feb. 14, 2003. | ||
| Prior Publication US 2008/0205738 A1, Aug. 28, 2008 | ||
| Int. Cl. G06K 9/00 (2006.01) | ||
| U.S. Cl. 382—132 [382/169] | 10 Claims |
| 6. An apparatus for correcting an image of an object under observation, comprising:
an x-ray detector configured to obtain a first sequence of images of a calibration device;
a processor configured to determine a first mean gray level in a zone of interest in a first image in the first sequence of
images;
the processor further configured to determine a second mean gray level in a zone of interest in a second image in the first
sequence of images;
the processor further configured to determine a variation value corresponding to a variation between the first mean gray level
and the second mean gray level;
the processor further configured to obtain a second sequence of images of the object;
the processor further configured to determine a third mean gray level in a zone of interest in a third image in the second
sequence of images; and
the processor further configured to correct a fourth image of the object in the second sequence of images based on the variation
value and the third mean gray level to obtain a corrected fourth image of the object.
|