Digital Watermarking

Digital Watermarking a Multimedia Security. . . PRESENTED BY- RAJIV RANJAN KR.

Digital Watermarking? ,[object Object],[object Object],[object Object]

Features of Watermarking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CLASSIFICATION OF WATERMARK ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CLASSIFICATION BY “HUMAN PERCEPTION”

Visible Watermark ,[object Object],[object Object]

Invisible Watermark ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CLASSIFICATION BY “ROBUSTNESS”

Fragile/SemiFragile/Robust ,[object Object],[object Object],[object Object]

CLASSIFICATION BY “DOCUMENT”

Text/Image/Audio watermarking ,[object Object]

Video Watermarking ,[object Object],[object Object],[object Object],[object Object],[object Object],Video watermarking refers to embedding watermarks in a video sequence in order to protect the video from illegal copying and identify manipulation

Discrete Cosine Transformation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Wave Transforms Frequency Amplitude

DCT: One Dimensional where n = total no. of data item p = pixel F = coefficients f(i)= is the intensity of the i th pixel The general equation for a 1D ( n data items) DCT is defined by the following equation:

DCT: 2D ,[object Object],[object Object],[object Object],The general equation for a 2D ( N by M image) DCT is defined by the following equation:

Frequency Domain ,[object Object],[object Object],[object Object],[object Object],[object Object],= watermared singal

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Digital Watermarking

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Digital Watermarking