Abstract: The present invention relates to a method of filtering an input image for producing an output image.

Abstract: The present invention relates to a method of filtering an input image using a target oriented filter pattern, which has been obtained by warping a source oriented filter pattern. Such a method comprises a step of computing a source oriented filter pattern at a central image point of said input image, said source oriented filter pattern comprising a source central line, a step of analyzing intensity levels of image points in the vicinity of the central image point for determining a target central line and a step of computing a target oriented filter pattern at the central image point from said target central line and said source oriented filter pattern by defining transformation rules between points of the source and points of the target oriented filter patterns. The method in accordance with the invention finally comprises a step of computing a target oriented filter from said target oriented filter pattern and of applying said target oriented filter to said input image for producing an output image.

Abstract: A modified Laplacian-pyramid method and system filters (340-360, 440-460) the Gaussian image at each level (31-33, 41-43) of the pyramid, and uses the filtered Gaussian image (341-361, 441-461) to produce the Laplacian-pyramid images (349-369, 449-469). The filtering of the Gaussian image is adaptive, and based at least in part on the characteristics of the Gaussian image at each stage. In one example embodiment, two filters (F1, F2) are used at each stage, and the Laplacian image (349-369) is based on a filtered version of the Gaussian image and an upsampled filtered version of a downsampling (346-366) of the Gaussian image. In another example, filter is used, and the Laplacian image (449-469) is based on the filtered version (441-461) of the Gaussian image and an upsampled downsampling (446-466) of the filtered version of the Gaussian image.

Abstract: A transmitter uses an adaptive forward error control scheme that includes redundant packets to reduce packet error rate at a receiver. The receiver analyzes the received packet error rate before correction to determine an optimal level of redundancy required to respect a maximum tolerated packet error rate after correction, and communicates this determined optimal level to the transmitter for controlling the amount of redundancy in subsequent transmissions from the transmitter.

Abstract: The invention relates to an image processing system for reduction of the noise and enhancement of edges in images of a sequence, comprising means of decomposition of spatial image signal yielding slices of different content; means of temporal filtering for differently filtering the slices according to the content; and means of recomposition of the images of the sequence from the temporally filtered slices. The decomposition may be performed using means of pyramidal decomposition. The means of temporal filtering may comprise motion compensation and/or recursive adaptive filtering. This system may further comprise imaging means for displaying the images of the sequence. The invention further relates to a medical examination apparatus coupled to this system.

Abstract: The invention applies to packet transmission networks. It proposes an adaptive forward error control scheme implemented at the application level, allowing to respect a maximum tolerated packet error rate. According to the invention, the amount of redundancy is adapted so as to offer a correction capability allowing to respect said maximum tolerated packet error rate. Advantageously, the maximum tolerated packet error rate is set by the application.

Abstract: The invention relates to an itinerary search method comprising a step of computing the itinerary from a criterion defined by a user (for example, a point of departure and a point of arrival) and a step of selecting service providers along the computed itinerary, said services being defined by the user.

Abstract: The invention proposes a new scheme for unequal error protection using forward error correction based on Reed-Solomon codes. The invention applies to data packets comprising data symbols having various level of importance. It consists in applying a single RS code to all data symbols regardless of their level of importance, but in skipping one or more of the error correction symbols generated from the data symbols of lower importance when forming error correction packets, if reduction of the redundancy is necessary.