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A rate-distortion framework is used to define a very low bit rate coding scheme based on wireframe model adaptation and optimized selection of motion estimators. This technique achieves maximum reconstructed image quality under the constraint of a target bitrate for the coding of the motion vector field, the wireframe representation information and the prediction error. Experimental results illustrating...
In this paper a method is presented for copyright protection in digital images. Copyright protection is achieved by embedding an invisible signal, known as digital signature or watermark, in the digital image. The method proposed in this paper casts the signature in the frequency domain by slightly modifying the values of randomly selected DC coefficients of the Discrete Cosine Transform (DCT) of...
Optimal mechanisms are determined for the hierarchical decomposition of wire-frame surfaces. A family of box-splines with compact support, suitable for the approximation of wire-frames is defined, generated by arbitrary sampling matrices with integer eigenvalues. Criterion of optimality is the minimization of the variance of the error difference between the original surface and its representation...
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