Digital Watermarking 1 - dinus.ac.iddinus.ac.id/repository/docs/ajar/Watermarking1.pdf · 3 Fakta...
Transcript of Digital Watermarking 1 - dinus.ac.iddinus.ac.id/repository/docs/ajar/Watermarking1.pdf · 3 Fakta...
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Digital Watermarking 1
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Sebuah prolog…”Sebuah gambar bermakna lebih dari seribu kata”
(A picture is more than words)
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Fakta
Jutaan gambar/citra digital bertebaran di internet via email, website, bluetooth, dsb
Siapapun bisa mengunduh citra, meng-copy-nya, menyunting, mengirim, memanipulasi, dsb.
Sekali citra diunduh/copy, referensi pemilik yang asli hilang sebab informasi kepemilikan tidak melekat di dalam citra.
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Siapa pemilik citra ini?
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Atau citra yang ini?
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Akibat penyebaran citra digital
Memungkinkan terjadi pelanggaran HAKI:
- mengklaim kepemilikan citra orang lain
- pemilik citra yang asli tidak mendapat royalti
atas penggandaan ilegal
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Karakteristik Dokumen Digital
Dokumen digital
- citra (JPEG/GIF/BMP/TIFF Images)
- audio (MP3/WAV audio)
- video (MPEG video)
- teks (Ms Word document)
Tepat sama kalau digandakan
Mudah didistribusikan (misal: via internet)
Mudah di-edit (diubah)
Tidak ada perlindungan terhadap kepemilikan, copyright, editing, dll.
Solusi: digital watermarking.
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Digital Watermarking
Digital Watermarking: penyisipan informasi (watermark)
yang menyatakan kepemilikan data multimedia
Watermark: teks, logo, audio, data biner (+1/-1), barisan
bilangan riil
Watermarking merupakan aplikasi steganografi
Tujuan: memberikan perlindungan copyright
+
=
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Originalwork
Message(regarding
work)
Watermarkembedder
Watermarkedwork
(looks likeoriginal)
Watermarkdetector
Detected
message
Definitions and Applications
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Watermark
Embedding
(E)
Citra (I)
Kunci (k)
Watermark (w)
Transmisi
Serangan (n)
Citra ber-
watermark
(I') Watermark
Extraction
(D)
I'n
Kunci (k)
Compare
Watermark (w)
w' 1/0
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Contoh: Image Watermarking (1)
Menyisipkan watermark ke dalam citra digital untuk
memberikan perlindungan copyright pada citra tsb.
Watermark: informasi yang menyatakan label
kepemilikan (copyright) sebuah citra
© Deshinta Ariyani
Bandung 2010-2014
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• Watermark melekat di dalam citra
• Penyisipan watermark tidak merusak kualitas citra • Watermark dapat dideteksi kembali sbg bukti kepemilikan
Image Watermarking (2)
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Image Watermarking (3)
Persyaratan umum:
- imperceptible
- robustness
- secure
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Cara Konvensional Memberi Label
Copyright
Label copyright ditempelkan pada gambar.
Kelemahan: tidak efektif melindungi copyright
sebab label bisa dipotong atau dibuang dengan
program pengolahan citra komersil (ex: Adobe
Photoshop).
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Original image + label copyright
Cropped image
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Label kepemilikan
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Cara watermarking
Watermark disisipkan ke dalam data multimedia.
Watermark terintegrasi di dalam data multimedia.
Kelebihan:
1. Setiap penggandaan (copy) data multimedia
akan membawa watermark di dalamnya.
2. Watermark tidak bisa dihapus atau dibuang.
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Data apa saja yang bisa di-watermark?
Citra Image Watermarking
Video Video Watermarking
Audio Audio Watermarking
Teks Text Watermarking
Perangkat lunak Software watermarking
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Digital Image Watermarking
Penyisipan watermark
Watermark
EmbeddingCitra (I)
Kunci
(k)
Citra
ber-watermark
Watermark (w)
)ˆ(I
IwIEkˆ),(
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Ekstraksi/deteksi watermark
Watermark
extraction
Kunci (k)
Citra
uji (J)
Watermark yang
diekstraksi (w’)Comparator
Citra
semula (I)
0/1
watermark
asli (w)
')( wJDk
tc
tcwwCt
,0
,1)',(
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Ekstraksi vs Deteksi
Ekstraksi: mengambil kembali (recover/reveal) bit
informasi watermark dari data multimedia.
Perlu proses komparasi dengan watermark asli untuk menentukan
kemiripan/cocokan.
watermark umumnya berupa pesan bermakna seperti logo, teks,
musik.
Deteksi: hanya menentukan apakah data multimedia
mengandung reference watermark atau tidak
watermak umumnya barisan biner atau barisan
bilangan real.
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Sejarah Watermarking
Abad 13, pabrik kertas di Fabriano, Italia, membuat kertas yang diberi watermark dengan cara menekan bentuk cetakan gambar pada kertas yang baru setengah jadi.
Ketika kertas dikeringkan terbentuklah suatu kertas yang ber-watermark. Kertas ini biasanya digunakan oleh seniman/sastrawan untuk menulis karya seni.
Kertas yang sudah dibubuhi tanda-air dijadikan identifikasi bahwa karya seni di atasnya adalah milik mereka.
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Perbedaan Steganografi dan
Watermarking
Steganografi
Tujuan: mengirim pesan rahasia apapun tanpa
menimbulkan kecurigaan
Persyaratan: aman, sulit dideteksi, sebanyak
mungkin menampung pesan (large capacity)
Komunikasi: point-to-point
Media penampung tidak punya arti apa-apa
(meaningless)
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Watermarking:
Tujuan: perlindungan copyright, pembuktian
kepemilikan (ownership), fingerprinting
Persyaratan: robustness, sulit dihapus (remove)
Komunikasi: one-to-many
Komentar lain: media penampung justru yang
diberi proteksi, watermark tidak rahasia, tidak
mementingkan kapasitas watermark
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Jenis-jenis Watermarking
Fragile watermarking
Tujuan: untuk menjaga integritas/orisinilitas
media digital.
Robust watermarking
Tujuan: untuk menyisipkan label kepemilikan
media digital.
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Watermarking pada Citra
Visible Watermarking
Invisible Watermarking
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Visible Watermarking
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Visible Watermarking
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Invisible Watermarking