US 7,321,690 B2
Device and method for detecting blurring of an image
Chae-Whan Lim, Taegukwangyok-shi (Korea, Republic of); Nam-Chul Kim, Taegukwangyok-shi (Korea, Republic of); Ick-Hoon Jang, Kumi-shi (Korea, Republic of); and Chong-Heun Kim, Kyongsangbuk-do (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd., Suwon-Si (Korea, Republic of)
Filed on Jan. 28, 2004, as Appl. No. 10/765,069.
Claims priority of application No. 10-2003-0006422 (KR), filed on Jan. 30, 2003.
Prior Publication US 2004/0252890 A1, Dec. 16, 2004
Int. Cl. G06K 9/46 (2006.01)
U.S. Cl. 382—191  [382/250; 708/402] 12 Claims
OG exemplary drawing
 
1. A device for determining whether or not an image is blurred, the device comprising:
an input part for receiving an image;
a block classification part for dividing the received image into blocks and classifying the divided blocks into character blocks and background blocks;
a character block energy calculation part for calculating an average energy ratio of the character blocks; and
a blurring detection part for determining whether or not the image is blurred based on a comparison of the average energy ratio with a predetermined threshold.