| US 7,469,061 B2 | ||
| Method of photo/text separation in an image | ||
| Ching-Lung Mao, Taipei (Taiwan); Shun-Yen Yao, Taipei (Taiwan); and Fu-Wen Lee, Taipei (Taiwan) | ||
| Assigned to Primax Electronics Ltd., Taipei (Taiwan) | ||
| Filed on Apr. 29, 2004, as Appl. No. 10/834,255. | ||
| Prior Publication US 2005/0244056 A1, Nov. 03, 2005 | ||
| Int. Cl. G06K 9/34 (2006.01) | ||
| U.S. Cl. 382—176 [382/270] | 10 Claims |
| 1. A method of photo/text separation of a document image, comprising the steps of:
converting the document image into a plurality of source color planes;
setting a source color consecutive point threshold (Tc),
performing an intensity operation for each of the source color planes, including (1) dividing each of the source color planes
into a plurality of pixel sections, each section being a square window of pixels; (2) performing an intensity falling point
operation for the pixels in each of the pixel sections, (3) setting a state value for each of the pixels in each of the pixel
sections, according to the set source color consecutive point threshold (Tc), and (4) accumulating the state values of the
pixels in each of the pixel sections; and
assigning photo/text types to the document image according to a connected length density threshold (Td) and a result of the
intensity operation.
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