Watermarking methods for digital images and videos

A method of multiresolution watermarking for digital images, the method comprising the steps of encoding and decoding the digital image in a discrete wavelet transform, wherein the encoding steps comprise:

• a) decomposing the digital image into a multiplicity of bands having a pyramidal structure;
• b) adding pseudo-random sequences to large coefficients located at high and middle frequency bands of the discrete wavelet transform;
• and
• c) taking the inverse discrete wavelet transform of the discrete wavelet transform having added pseudo-random sequences to produce a watermarked image;
• and wherein the decoding steps comprise:
• d) decomposing the watermarked image and the original digital image into at least four bands;
• and
• e) calculating cross correlations of the bands of the watermarked and original digital images until a peak is detected;
• or if no peak is detected,
• f) decomposing the watermarked and original digital images into four additional subbands and repeating step e) until a peak is detected, wherein the detection of the peak signifies a signature of the watermarked image and the failure to detect the peak signifies an undetectable signature of the watermarked image.