Implementasi Digital Watermarking. Our Digital World.

Presentasi berjudul: "Implementasi Digital Watermarking. Our Digital World."— Transcript presentasi:

1 Implementasi Digital Watermarking

2 Our Digital World

3 Digital Flaws Illegal Copying Pemalsuan No Copyright Protection Tidak ada identitas kepemilikan

4 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

5 Cara kerja Watermarking Watermark Insertion Attack or Distortion Channel Watermark Detection Watermark Original Image Key (Code) Watermark

6 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

7 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

8 Results 1) Watermarked Image

9 2) Low Pass Filter Image

10 3) Median Filter Image

11 4) Noise Image

12 5) 15% Quality JPEG Image