Watermarking technique based on ISB (Intermediate Significant Bit)
Digital watermarking is a special case of the general information hiding problem. It inserts a perceptually transparent pattern called watermark in an image called host or cover using an embedding algorithm. The purpose of the watermark is to supply the ownership of the image or copyright protecti...
| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/17876/ http://irep.iium.edu.my/17876/1/p1.pdf |
| Summary: | Digital watermarking is a special case of the general information hiding problem. It inserts a
perceptually transparent pattern called watermark in an image called host or cover using an embedding
algorithm. The purpose of the watermark is to supply the ownership of the image or copyright protection
information. The energy of the embedded data should be low enough when projected onto the human
perception domain but it should be strong enough for robust machine detection. Least Significant Bit
(LSB) technique is the earliest developed technique in watermarking and it is also the most simple, direct
and common technique. It essentially involves embedding the watermark by replacing the least significant
bit of the image data with a bit of the watermark data. The disadvantage of LSB is that it is not robust
against attacks. The aim of this study is to develop a robust watermarking model using spatial domain
technique and at the same time maintaining important watermarking requirements of picture quality. The
new model has been developed based on intermediate significant bit (ISB) aim to replace the
watermarked image pixels by new pixels that can protect the watermark data against attacks and at the
same time keeping the new pixels very close to the original pixels in order to protect the quality of
watermarked image. The technique is based on testing the value of the watermark pixel according to the
range of each bit-plane. The main contribution of this research is replacing the classic least significant bits
(LSB) technique by a new technique called intermediate significant bits ISB, which improves the
robustness and maintains the quality of watermarked images. |
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