Abstract: The method for the inlaying of color video images consists on the one hand in generating a switching signal, or dividing key, applying a gain on the image points belonging to the contour of the subject to be inlaid, in proportion to the distance value (DIST) between the color of the point and that of the back-ground, and on the other hand in carrying out a mixing of the source image and a new background image which is a function of the value of the dividing key signal at the point in question and such that the values of the source signal and of the new background signal are fixed at constants over the width of the contour.

Abstract: This circuit is essentially formed by a circuit of the programmable (preferably reprogrammable) logic component type, receiving, at input, a reference clock signal (CK) and configured in such a way as to deliver, at output, the plurality of clock signals (.phi.1 . . . .phi.N) needed to control the charge transfer device.

Abstract: The invention relates to a device for scanning still images as applicable in particular to high-definition television (HDTV) systems. In accordance with customary practice, the entire still image is converted by an optical system having an oscillating mirror to an image which passes in front of a linear sensor having photosensitive elements. Diffusion of the optical system causes detachment of dark areas which are adjacent to bright areas. In order to prevent this detachment, the movement of a shutter provided with slits is synchronized with the movement of the mirror so as to occult part of the image which passes in front of the sensor, thus leaving only the zone located at the level of the sensor.

Abstract: A device is provided for correcting the contours in an image comprising in the green channel a contour extraction circuit followed by a circuit for processing these contours. It also comprises in the red channel a second contour extraction circuit followed by a second circuit for processing the contours. A validation circuit only validates the contour signal coming from the red channel when the red level is relatively high with respect to the green level. In this case, the red contour signal is superimposed on the contour from the green channel for correcting the contours of the three chrominance channels, by means of a mixing circuit.

Abstract: A variable digital phase-shifter comprises a variable-propagation-time phase corrector consisting of a nonrecursive transversal digital filter having a predetermined even number N of coefficients. The filter is coupled with an amplitude corrector consisting of a nonrecursive transversal digital bandpass filter with an odd number of coefficients, a multiplier and a summing circuit for correcting the variations in gain of the phase corrector in order to obtain an approximately constant overall gain of the variable digital phase-shifter.

Abstract: An embodiment of the device comprises: three subtracters, three multipliers and a correction coefficient determination device. The subtracters and multipliers make it possible to obtain three signals, whose values are multiplied by a same coefficient, in order that they retain the same ratios as the values of the signals supplied to the input of the device. The device for determining a correction coefficient comprises means for determining which of the input signals has the highest instantaneous value at each time, in order to apply thereto a predetermined, non-linear transformation and for supplying a correction signal which is applied to the multipliers.

Abstract: Device for obtaining continuous plots on the screen of a display console controlled by a graphic processor, comprising a graphic memory for storing in binary form the matrix of points or pixels representing the image displayed on the screen and an attribute memory containing the attributes of each of the points of the image. An interpolation circuit contains a table for calculating the attributes of the intermediate points between consecutive points of the dot matrix. The table of the interpolation circuit is addressed by the preexisting value PA of the pixel to be modified found in the attribute memory, by the value PN of the attribute of the pixels on the plot on either side of the point to be modified and by an interpolation value F equal to the fractional part of the position of the point to be modified between consecutive points on the plot, each position in the table containing an attribute value PM confirming the relationshipPM=F.PA+(1-F).

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.