Segment-based and reversible techniques in data hiding for binary images
The existing watermarking methods for binary images either have low embedding capacity or have poor visual quality of watermarked images. Two fragile watermarking methods for binary images are proposed for the purpose of authentication. The first method is a segment-based watermarking method. In the...
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| Format: | Thesis |
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2008
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| Online Access: | https://hdl.handle.net/10356/3513 |
| _version_ | 1826129529476743168 |
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| author | Gao, Yupeng |
| author2 | Kot Chichung, Alex |
| author_facet | Kot Chichung, Alex Gao, Yupeng |
| author_sort | Gao, Yupeng |
| collection | NTU |
| description | The existing watermarking methods for binary images either have low embedding capacity or have poor visual quality of watermarked images. Two fragile watermarking methods for binary images are proposed for the purpose of authentication. The first method is a segment-based watermarking method. In the embedding process, a sequence of continuous black pixels segment is searched in a binary image. After a segment is located, the pre-defined masks are used to check two ends of the segment to determine its embeddability. For embeddable segments, a black pixel is added or removed at either end of the segment by using the odd or even number of black pixels in the segment to embed bit “1” or “0”. The modified locations are the selected corner pixels of the characters. Experimental results show that it can achieve a good visual quality and higher embedding capacity than some binary document watermarking methods reported in literature. |
| first_indexed | 2024-10-01T07:42:05Z |
| format | Thesis |
| id | ntu-10356/3513 |
| institution | Nanyang Technological University |
| last_indexed | 2024-10-01T07:42:05Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | ntu-10356/35132023-07-04T16:41:43Z Segment-based and reversible techniques in data hiding for binary images Gao, Yupeng Kot Chichung, Alex School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems DRNTU::Engineering::Computer science and engineering::Data::Coding and information theory The existing watermarking methods for binary images either have low embedding capacity or have poor visual quality of watermarked images. Two fragile watermarking methods for binary images are proposed for the purpose of authentication. The first method is a segment-based watermarking method. In the embedding process, a sequence of continuous black pixels segment is searched in a binary image. After a segment is located, the pre-defined masks are used to check two ends of the segment to determine its embeddability. For embeddable segments, a black pixel is added or removed at either end of the segment by using the odd or even number of black pixels in the segment to embed bit “1” or “0”. The modified locations are the selected corner pixels of the characters. Experimental results show that it can achieve a good visual quality and higher embedding capacity than some binary document watermarking methods reported in literature. MASTER OF ENGINEERING (EEE) 2008-09-17T09:31:21Z 2008-09-17T09:31:21Z 2007 2007 Thesis Gao, Y. (2007). Segment-based and reversible techniques in data hiding for binary images. Master’s thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/3513 10.32657/10356/3513 Nanyang Technological University application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems DRNTU::Engineering::Computer science and engineering::Data::Coding and information theory Gao, Yupeng Segment-based and reversible techniques in data hiding for binary images |
| title | Segment-based and reversible techniques in data hiding for binary images |
| title_full | Segment-based and reversible techniques in data hiding for binary images |
| title_fullStr | Segment-based and reversible techniques in data hiding for binary images |
| title_full_unstemmed | Segment-based and reversible techniques in data hiding for binary images |
| title_short | Segment-based and reversible techniques in data hiding for binary images |
| title_sort | segment based and reversible techniques in data hiding for binary images |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Computer hardware, software and systems DRNTU::Engineering::Computer science and engineering::Data::Coding and information theory |
| url | https://hdl.handle.net/10356/3513 |
| work_keys_str_mv | AT gaoyupeng segmentbasedandreversibletechniquesindatahidingforbinaryimages |