Implementasi Digital Watermarking
Our Digital World
Digital Flaws Illegal Copying Pemalsuan No Copyright Protection Tidak ada identitas kepemilikan
What is Digital Watermarking? Digital Watermarking menyisipkan signal signal(watermark) ke dalam sinyal lain (image) Penyisipan tidak boleh menyebabkan rusaknya sinyal aslinya ( host/original signal ) Original ImageWatermarked Image
Cara kerja Watermarking Watermark Insertion Attack or Distortion Channel Watermark Detection Watermark Original Image Key (Code) Watermark
Penyisipan Watermark DCT Determine Significant Regions Insert Watermark Inverse DCT + Random Numbers Vi’ = Vi * (1 + * (Xi + * Wi)) Cox’s Watermarking Insertion DCT Change Matrix to Vector
Deteksi Watermark Similar? - Marked Original DCT Extracted Watermark Original Watermark Similarity Function sim(X,X*) = dot(X*,X)/sqrt(X*,X*) X* = Extracted X = Original
Results 1) Watermarked Image
2) Low Pass Filter Image
3) Median Filter Image
4) Noise Image
5) 15% Quality JPEG Image