Title:
ESTIMATING TEXT COLOR AND SEGMENTATION OF IMAGES
Document Type and Number:
WIPO Patent Application WO2001069530
Kind Code:
A3
Abstract:
In some embodiments, the invention includes receiving a digital image including text and background. The method includes vector quantizing the digital image such that the digital image is divided into certain colors, and creating a text color histogram from a portion of the text and a first portion of the background. The method also includes creating at least one background color histogram from a second portion of the background, and creating a difference color histogram from a difference between the text color histogram and the at least one background color histogram, and wherein an estimated color of the text is derived from the difference color histogram. In other embodiments, the invention includes receiving a text object including bounding boxes of multiple frames of a video signal. The method further includes estimating a color of text of the bounding boxes and aligning blocks representing the bounding boxes through a best displacement search in which only pixels having a color within a threshold of an estimated color are considered. Some embodiments of the invention also include receiving digital images in text bounding boxes and in preparation for a segmentation process, adjusting sizes of the digital images to a fixed height.
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Inventors:
LIENHART RAINER W
WERNICKE AXEL
WERNICKE AXEL
Application Number:
PCT/US2001/005776
Publication Date:
December 27, 2002
Filing Date:
February 23, 2001
Export Citation:
Assignee:
INTEL CORP (US)
International Classes:
G06T5/00; G06V30/10; (IPC1-7): G06T5/00
Other References:
LIENHART R: "AUTOMATIC TEXT RECOGNITION FOR VIDEO INDEXING", PROCEEDINGS OF ACM MULTIMEDIA 96. BOSTON, NOV. 18 - 22, 1996, NEW YORK, ACM, US, 18 November 1996 (1996-11-18), pages 11 - 20, XP000734705, ISBN: 0-89791-871-1
YU ZHONG ET AL: "LOCATING TEXT IN COMPLEX COLOR IMAGES", PATTERN RECOGNITION, PERGAMON PRESS INC. ELMSFORD, N.Y, US, vol. 28, no. 10, 1 October 1995 (1995-10-01), pages 1523 - 1535, XP000537669, ISSN: 0031-3203
JAIN A K ET AL: "Automatic text location in images and video frames", PATTERN RECOGNITION, PERGAMON PRESS INC. ELMSFORD, N.Y, US, vol. 31, no. 12, 1 December 1998 (1998-12-01), pages 2055 - 2076, XP004139539, ISSN: 0031-3203
R. LIENHART, W. EFFELSBERG: "AUTOMATIC TEXT SEGMENTATION AND TEXT RECOGNIITON FOR VIDEO INDEXING", MULTIMEDIA SYSTEMS, vol. 8, January 2000 (2000-01-01), pages 69 - 81, XP001074678
WU X: "YIQ VECTOR QUANTIZATION IN A NEW COLOR PALETTE ARCHITECTURE", IEEE TRANSACTIONS ON IMAGE PROCESSING, IEEE INC. NEW YORK, US, vol. 5, no. 2, 1 February 1996 (1996-02-01), pages 321 - 329, XP000678932, ISSN: 1057-7149
YU ZHONG ET AL: "LOCATING TEXT IN COMPLEX COLOR IMAGES", PATTERN RECOGNITION, PERGAMON PRESS INC. ELMSFORD, N.Y, US, vol. 28, no. 10, 1 October 1995 (1995-10-01), pages 1523 - 1535, XP000537669, ISSN: 0031-3203
JAIN A K ET AL: "Automatic text location in images and video frames", PATTERN RECOGNITION, PERGAMON PRESS INC. ELMSFORD, N.Y, US, vol. 31, no. 12, 1 December 1998 (1998-12-01), pages 2055 - 2076, XP004139539, ISSN: 0031-3203
R. LIENHART, W. EFFELSBERG: "AUTOMATIC TEXT SEGMENTATION AND TEXT RECOGNIITON FOR VIDEO INDEXING", MULTIMEDIA SYSTEMS, vol. 8, January 2000 (2000-01-01), pages 69 - 81, XP001074678
WU X: "YIQ VECTOR QUANTIZATION IN A NEW COLOR PALETTE ARCHITECTURE", IEEE TRANSACTIONS ON IMAGE PROCESSING, IEEE INC. NEW YORK, US, vol. 5, no. 2, 1 February 1996 (1996-02-01), pages 321 - 329, XP000678932, ISSN: 1057-7149
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