Marc Gazalet

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Blocking effect constitutes one of the main drawbacks of the actual DCT-based compression methods. We propose in this paper a new block reduction technique; it is based on a space-variant non-linear filtering operation of the blocking artifacts present in the image to be reconstructed. To account for the perceptual importance of the distortion, the amount(More)
The multifrequency acousto-optic modulator efficiency is limited mainly by the two-tone, third-order intermodulation products. We show here that a suitable anisotropic interaction can greatly reduce this undesirable effect. Numerical computations have been drawn for a paratellurite acousto-optic cell, and it is shown that a reduction of ~ 16 dB can be(More)
Here a large deflection angle, low optical frequency-shift acousto-optic device is presented. This is realized by two successive acousto-optic interactions in the same cell. The relevant parameters of operation are analyzed in detail. A practical case with paratellurite material is then considered. Results from numerical computations leading to practical(More)