Abstract: The invention relates to a cooling system for an electronic box capable of releasing heat. It comprises a passive cooling device able to be connected to the electronic box and an element consisting of a heat-conducting material, and this element comprises at least one contact region connected to the passive cooling device, this contact region being arranged on the element so as to dissipate the heat coming from the cooling device toward the whole of the element.

Abstract: The invention relates to a cooling system for an electronic box (10) capable of releasing heat. It comprises a passive cooling device (20) able to be connected to the electronic box (10) and an element (50) consisting of a heat-conducting material, and this element (50) comprises at least one contact region (52) connected to the passive cooling device (20), this contact region being arranged on the element so as to dissipate the heat coming from the cooling device toward the whole of the element (50).

Abstract: A device for automatic image segmentation according to the invention comprises a data processor associated with a network of automata organized in three levels; the inputs of each of the automata are weighted by adjustable coefficients; the number of automata of the first level is equal to the number of characteristic values computed from observation windows taken firstly in a set of examples of image zones having different textures. Learning by the network permits adjustment of the weighting coefficients of the automata of the network until all the examples of the same texture lead to the same configuration.

Abstract: A method for recording and/or reproducing digitally coded video signals. A frame sequence is coded in such a way that an intraframe coded picture having a fixed or variable block length is recorded at the beginning. A fixed number of interframe coded pictures follow. The block length of the interframe coded pictures can be both fixed and variable. A cutting begins with and ends before an intraframe coded picture.

Abstract: A method is provided for bridging between disjointed contour elements in an image by searching for an optimum bridging path between the facing ends of disjointed contour elements in the image. The method of the steps of defining a search window between each of the facing ends of the disjointed controur elements, considering in the window the different image points as nodes on a graph, determining an elementary cost associated with each path connecting each node to its neighboring nodes from amplitude and/or orientation data of the luminance function used for detecting the contours and in determining the optimum path by following, from the costs obtained, a line for which the luminance gradient of the detected points appears to be a maximum.

Abstract: A method and the system for bit-rate compression of digital data between a television transmitter and receiver employs at the transmitter a differential coding device comprising a code allocator coupled respectively to the outputs of predictors which deliver the spatial prediction errors of the contour areas or highly textured areas of the image, the spatial prediction errors of the uniform areas and the temporal prediction errors of the uniform and fixed areas. The code allocator is controlled by a selecting device which selects one output of the predictors for applying a prediction error value to the input of a coding structure of the code allocator in order to code each datum of a current point applied to the input of a predictor in three different fixed-length codes, depending on whether the current point is located in a contour area or highly textured area of the image or whether the current point is located in a fixed or moving uniform area.

Abstract: The coding device for a television transmitter includes an addressing and coding circuit for coding the values of the luminance and/or chrominance signals of each image point in accordance with a first code when the corresponding points are located in moving zones and in accordance with a second code when the corresponding points are located in widened zones, the widened zones including non-moving points which are within a predetermined distance of moving points. A concatenation circuit forms a concatenated series of codes obtained in order to transmit said codes over the transmission channel by means of transmission circuits. A bridging circuit initiates coding of the luminance and/or chrominance values in accordance with the first and second codes. A moving detector is coupled through a first input to the output of an image memory and receives on a second input each current luminance and/or chrominance signal to be coded.

Abstract: The method consists in computing a luminance and/or chrominance gradient indicator (I.sub.g) at each point of the image, in computing a threshold value (S(X.sub.o)) as a function of each gradient obtained, in measuring the inter-image luminance and/or chrominance difference of each point of the image, in comparing the inter-image difference obtained at each point with the corresponding computed threshold value, in applying the result of the comparison to the input of a density-filtering device in order to detect the density of moving points in proximity to each scanned point and to compare the density obtained in respect of each point with a predetermined density threshold value in order to provide an indication of moving points when the density at each point considered exceeds the predetermined density threshold value.

Abstract: In a method for detection of moving points in a television image for digital television systems providing conditional-replenishment bit-rate compression, the image is split-up into blocks of N.times.M points, the points of one block being located at the intersections of N lines and M columns of the image. The N.times.M inter-image differences between values of luminance and/or of chrominance are converted to N.times.M coefficients by means of an orthogonal transformation. The absolute values of the coefficients obtained are compared with one or a number of predetermined reference thresholds in order that the points placed at the center of a block should be stated as moving when the absolute value of at least one coefficient obtained as a result of this transformation is higher than at least one predetermined reference threshold.The device comprises an array of shift registers for storing the inter-image differences, a matrixing element for calculating the coefficients and a decision element.

Abstract: The method and the system for compression of the flow of data between a television transmitter and a television receiver make provision at the transmitter for a differential coding system comprising a circuit for computation and propagation of coding costs with respect to visibility thresholds at which a coding error becomes apparent on the received image, coding being performed by utilizing at least two different quantization and/or prediction characteristics. A device connected to the differential coding system transmits to the receiver an indication relating to a change in characteristic instead of the data corresponding to the image point to be transmitted when the point is located within an image zone in which the change is necessary. A device is provided at the receiver for reconstructing the data corresponding to the non-transmitted point as a function of data of points already known to the receiver.

Abstract: Method and apparatus for compressing the flow rate of data transmitted between a television transmitter and a television receiver in which data to be transmitted is received at a differential coding device which includes a predictor, a quantizer, a transmitted data reconstruction device, and a code allocator. Pseudo-random data is added to the data to be transmitted in order to make the quantization levels of the quantizer fluctuate about a mean position. Upon reception, the received data is received at a differential decoding device which includes a code converter, a predictor, a transmitted data restoration device, and a digital filter. The received data is filtered to eliminate unwanted granular noise while retaining the image contours of the transmitted image.