US 7,321,675 B2
Image processing apparatus, image processing method, storage medium and program
Hiroyuki Shinbata, Tochigi (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Nov. 12, 2003, as Appl. No. 10/712,554.
Claims priority of application No. 2002-338188 (JP), filed on Nov. 21, 2002.
Prior Publication US 2004/0101187 A1, May 27, 2004
Int. Cl. G06K 9/00 (2006.01)
U.S. Cl. 382—128  [382/132; 382/282] 3 Claims
OG exemplary drawing
 
1. An image processing apparatus for gradation transformation processing of an abdominal image which includes a spinal region and a gas region, comprising:
first means for obtaining a processed image by sorting pixels of the abdominal image into an order from pixels having higher pixel values to pixels having lower pixel values;
second means for calculating a characteristic value from a predetermined region of the processed image; and
gradation transforming means for executing gradation transformation processing of the abdominal image based on the characteristic value,
wherein the predetermined region is set at a position apart from low-pixel-value-region side of the processed image by a distance corresponding to the spinal region.