
<strong>Paper Title</strong><br>
Watermarking Scheme For Image Content Authentication<br>
<br>

<strong>Abstract</strong><br>
 Our project proposes a  semi-fragile watermarking scheme for image content authentication with tampering 
localization. Here we use a non-traditional quantization method to modify one of the chosen approximation coefficient of 
each non-overlapping block to ensure its robustness against incidental attacks and fragileness. The image content 
authentication starts with watermark extracting process using the parity of quantization results from the probe image, where 
the round operation is used to ensure the semi-fragile property. It then constructs a binary error map and computes two 
authentication measures with M1 measuring the overall similarity between extracted and embedded watermarks and M2 
measuring the overall clustering level of tampered error pixels. These two measures are further integrated to confirm the 
image content and localize the possible tampered areas.  
 
Keywords—Quantization, Error map, Authentication measures