Abstract: The method comprises the following steps: calculation of the spatial activity of each macroblock and of the temporal activity between the macroblocks constituting a group of macroblocks in field mode, calculation of an activity index relating to the group that is an increasing function of the temporal activity and a decreasing function of the spatial activity of the group, comparison of the activity index relating to the group, to a predefined threshold, to define it as a group having activity, coding of the picture in field or frame mode according to the number of macroblock groups detected having activity with respect to the number of groups of macroblocks in the picture. The application relate to data compression, particularly the H 264 standard.

Abstract: The method, for the determination of the coding mode of a macroblock constituted of picture blocks, carries out a pre-selection of intra directional predictive coding modes of macroblock blocks according to the following steps: calculation of the activities gradient of a block in the prediction directions, pre-selection of intra directional coding modes of a block for which the directions correspond to the activity or activities gradient of minimum value.

Abstract: The invention concerns a method for processing images, texture pattern blocks representative of a typical texture of the images being stored in a memory, the method comprising the following steps: transforming the pixel grey levels of a current block into a current block of frequency coefficients using a predefined transform; building up a merger block, each frequency coefficient positioned at a defined place of the merger block being equal either to the frequency coefficient positioned at the same place of the current block, or to the frequency coefficient positioned at the same place of a texture pattern block among the texture pattern blocks stored in the memory; selecting a merger block according to a predefined function (J); and replacing in the image the current block by the selected merger block. The invention also concerns an electronic device for processing the corresponding images.

Abstract: The invention concerns a method for processing images, texture pattern blocks representative of a typical texture of the images being stored in a memory, the method comprising the following steps: transforming the pixel grey levels of a current block into a current block of frequency coefficients using a predefined transform; building up a merger block, each frequency coefficient positioned at a defined place of the merger block being equal either to the frequency coefficient positioned at the same place of the current block, or to the frequency coefficient positioned at the same place of a texture pattern block among the texture pattern blocks stored in the memory; selecting a merger block according to a predefined function (J); and replacing in the image the current block by the selected merger block. The invention also concerns an electronic device for processing the corresponding images.

Abstract: A first method for processing of a radiological image to be used as a mask image in subtracted angiography wherein processing for reduction of noise present in the mask image adapted to preserve the aspect of the noise in the mask image. A second method for processing of a sequence of subtracted images (Jn) obtained by subtraction of a mask image from each of the images in a sequence of images (In) acquired during angiography of blood vessels in an area of interest (104) of a patient (200), wherein processing for reduction of noise present in the subtracted images (Jn) adapted to preserve the aspect of vessels (80) in the subtracted images. A radiography apparatus for implementing a method according to one and/or the other of the first and second methods.

Abstract: The method, for the determination of the coding mode of a macroblock constituted of picture blocks, carries out a pre-selection of intra directional predictive coding modes of macroblock blocks according to the following steps: calculation of the activities gradient of a block in the prediction directions, pre-selection of intra directional coding modes of a block for which the directions correspond to the activity or activities gradient of minimum value.

Abstract: The method comprises the following steps: calculation of the spatial activity of each macroblock and of the temporal activity between the macroblocks constituting a group of macroblocks in field mode, calculation of an activity index relating to the group that is an increasing function of the temporal activity and a decreasing function of the spatial activity of the group, comparison of the activity index relating to the group, to a predefined threshold, to define it as a group having activity, coding of the picture in field or frame mode according to the number of macroblock groups detected having activity with respect to the number of groups of macroblocks in the picture. The application relate to data compression, particularly the H 264 standard.

Abstract: A first method for processing of a radiological image to be used as a mask image in subtracted angiography wherein processing for reduction of noise present in the mask image adapted to preserve the aspect of the noise in the mask image. A second method for processing of a sequence of subtracted images (Jn) obtained by subtraction of a mask image from each of the images in a sequence of images (In) acquired during angiography of blood vessels in an area of interest (104) of a patient (200), wherein processing for reduction of noise present in the subtracted images (Jn) adapted to preserve the aspect of vessels (80) in the subtracted images. A radiography apparatus for implementing a method according to one and/or the other of the first and second methods.

Abstract: The invention relates to a method for generating from a sequence of at least one source image, called source sequence, a sequence of at least one reduced image, called reduced sequence, the at least one reduced image having a size smaller or equal to the size of the at least one source image. The at least one reduced image is generated by extracting from the at least one source image at least one image part whose size and position depend on the perceptual interest of the pixels comprised in the at least one image part.