Title :
Copyright protection of images using robust digital signatures
Author :
Nikolaidis, Nikos ; Pitas, Ioannis
Author_Institution :
Dept. of Electr. & Comput. Eng., Thessaloniki Univ., Greece
Abstract :
A method for copyright protection of digital images is presented. Copyright protection is achieved by embedding an “invisible” signal, known as digital signature, in the digital image. Signature casting is performed in the spatial domain by slightly modifying the intensity level of randomly selected image pixels. Signature detection is done by comparing the mean intensity value of the marked pixels against that of the not marked pixels. Statistical hypothesis testing is used for this purpose. The signature can be designed in such a way that it is resistant to JPEG compression and lowpass filtering. This is done by minimizing the energy content of the signature signal in higher frequencies. Experiments on real image data verify the effectiveness of the method
Keywords :
copy protection; copyright; image processing; security of data; statistical analysis; JPEG compression; digital images; embedded invisible signal; energy content; experiments; image copyright protection; image pixel intensity; lowpass filtering; mean intensity value; real image data; robust digital signatures; signature casting; signature detection; signature signal; spatial domain; statistical hypothesis testing; Casting; Copyright protection; Digital images; Digital signatures; Filtering; Image coding; Pixel; Robustness; Testing; Transform coding;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1996. ICASSP-96. Conference Proceedings., 1996 IEEE International Conference on
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-3192-3
DOI :
10.1109/ICASSP.1996.545849
