Watermarking Citra Digital Menggunakan Alihragam Wavelet: Perbandingan Strategi Penyisipan Watermark pada Subbidang Detail Citra dan Subbidang Aproksimasi Citra  

Oleh:

Dwiandiyanta, B. Yudi

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Jurnal Teknologi Industri vol. 9 no. 4 (Oct. 2005), page 327-338.
Topik: Robustness; Image Watermarking; Daubechies Wavelets; Wavelet Transform

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ83.6 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Watermarking has been applied to image data to prevent illegal distribution of the copyrighted images. Watermarking is a process of giving a mark in an image with a hidden message or signature, which is embedded in the image, such that the difference between the original and the marked ones is invisible. In this research, the development of an algorithm will be done in wavelet domains in order to get robust watermarking procedure agains possible attacks. There are two different strategies to embed watermark image to host image, First, we embed the watermark image in the details subband of wavelet domain host image and second we embed the watermark image in the approximation subband of the host images and for the watermark images were used a binary image with esimated size of 1/16 host image, The embedding process based on the properties of the Human Visual System (HVS), to judge the visibility aspect. Embedding process using additive algorithm, The wavelet used was Daubechies - 4 (db - 4) wavelet. The result of testing on watermarking algorithm show that watermarking algorithm embedded in the details subband of wavelet domain host image were more robust with respect to high-pass filtering, brightness modification, histogram equalization, noise addition, however watermarking algorithm embedded in the approximation subband of wavelet domain host image were robust with respect to low-pass filtering and median filtering.

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