Abstract: The present invention relates to a method of processing a sequence of digital images, intended to detect, in a dynamical manner, a grid comprising blocking artefacts. Said method comprises the steps of, a) detecting (100) a current spatial grid (SG(t)) within a portion of the image constituted by a current field (FLD(t)), b) determining (200) a current reference grid (RG(t)) from a current spatial grid (SG(t)) and a preceding reference grid (RG(t-1)) supplied by a memory MEM (150), the current reference grid (RG(t)) being subsequently stored temporarily in the memory MEM (150), and c) correcting COR (300) blocking artefacts which are present in the current field (FLD(t)) from the preceding reference grid (RG(t-1)) so as to supply a processed field (PPP(t)).

Abstract: A method and an arrangement for processing data in a digital input image include a decoder configured to decode encoded data. A detector is configured to detect the decoded data and a correction device is configured to correct the detected data. A predicted maximum frequency is calculated based on first and second data sets transformed by first and second transform, respectively. A real maximum frequency is calculated based on data transformed by an overall transform of a data set corresponding to the concatenation of the first and second data sets. A grid is determined by comparing the real and predicted maximum frequencies for a portion of the digital input image.

Abstract: The present invention relates to a digital data filtering circuit. This digital data filtering circuit is able to implement the calculation steps of a discrete transform of a set of 8 original data (w), and calculating an inverse discrete transform of the set of transformed data thus obtained. For this purpose, it comprises a first filtering module (FILo1) intended to filter the odd transformed data or the 3 odd transformed data items having the highest frequencies in the set of transformed data, and a second filtering module (FILo2) connected to the first filtering module and intended to filter the 2 odd transformed data having the highest frequencies in the set of transformed data.

Abstract: A method of post-processing digital images frequency transforming a set of the pixels to a set of transformed coefficients; extracting original low-frequency coefficients and original high-frequency coefficients from the set of transformed coefficients; correcting the original low-frequency coefficients and the original high-frequency coefficients for delivering a set of corrected transformed coefficients including corrected low-frequency coefficients and corrected high-frequency coefficients; and combining the set of corrected transformed coefficients and the original high-frequency coefficients for delivering a set of combined transformed coefficients. The set of combined transformed coefficients are inverse frequency transformed for delivering a processed set of pixels that are ready for display on a screen.

Abstract: The present invention relates to a method of processing a sequence of digital images, intended to detect, in a dynamical manner, a grid comprising blocking artefacts. Said method comprises the steps of, a) detecting (100) a current spatial grid (SG(t)) within a portion of the image constituted by a current field (FLD(t)), b) determining (200) a current reference grid (RG(t)) from a current spatial grid (SG(t)) and a preceding reference grid (RG(t-1)) supplied by a memory MEM (150), the current reference grid (RG(t)) being subsequently stored temporarily in the memory MEM (150), and c) correcting COR (300) blocking artefacts which are present in the current field (FLD(t)) from the preceding reference grid (RG(t-1)) so as to supply a processed field (PPP(t)).

Abstract: The present invention relates to a digital data filtering circuit. This digital data filtering circuit is able to implement the calculation steps of a discrete transform of a set of 8 original data (w), and calculating an inverse discrete transform of the set of transformed data thus obtained. For this purpose, it comprises a first filtering module (FILo1) intended to filter the odd transformed data or the 3 odd transformed data items having the highest frequencies in the set of transformed data, and a second filtering module (FILo2) connected to the first filtering module and intended to filter the 2 odd transformed data having the highest frequencies in the set of transformed data.

Abstract: The present invention relates to a device for processing blocks of coded data included in a sequence of coded digital images (ES) according to a block-based coding technique, said device comprising a post-processing circuit DFD (33). Such a device effectively corrects the blocking artifacts while minimizing the bandwidth used, the decoder directly transmitting decoded data blocks (B) to the post-processing circuit. In addition, such a device introduces no or little drift during the decoding since the decoder continues to use reference images (RB) during a motion compensation step. This is because the reference images are no longer the decoded images but the completely processed images as the post-processing circuit is situated in the decoding loop.

Abstract: The invention relates to a method of post-processing digital images, the method comprising a step of frequency transformation TF (21), suitable for delivering a set of transformed coefficients (Y) from a set of pixels (y), extraction SEP (22) of original low-frequency coefficients (Ybfo) and original high-frequency coefficients (Yhfo) comprised in the set of transformed coefficients, correction COR (23), suitable for delivering a set of corrected transformed coefficients (Yc) from the original low-frequency coefficients, and combination (24), suitable for delivering a set of combined transformed coefficients (Yadd) from the original high-frequency coefficients and from the set of corrected transformed coefficients, and a step of inverse frequency transformation ITF (25) of the set of combined transformed coefficients, suitable for delivering a processed set of pixels (yout) that are ready for display on a screen.

Abstract: In a system integrating modules (PROC) designed for a time-slotted resource-accessing scheme and modules (PROC′) designed for accessing a common resource based on request-arbitration, a request-arbitration scheme is used for managing access to a common resource. The module(s) (PROC) designed for a time-slotted resource-accessing scheme are associated with an anticipatory request generator (ARG) adapted to generate, and forward to the arbiter (P_ARB), anticipated requests produced ahead of the time instants when the associated modules are designed to make access requests. A data buffer (DATA BUF) is also associated with each of the modules designed for a time-slotted resource-accessing scheme, so as to hold data obtained as a result of an anticipated request until the time instant when the module generates the request associated with this data.

Abstract: The present invention relates to a device for the inverse transformation of transformed data (X) into inversely transformed data (x) via an inverse transformation matrix which can be decomposed into submatrices along a diagonal of the matrix. Said device comprises permutation means (11) able to reorder the transformed data according to the number of data to be processed. It also comprises scalable calculation modules (12, 13, 14, 15) able to effect a product of reordered transformed data and of a submatrix. Finally, it comprises linear combination means (16, 17, 18) able to linearly combine the data issuing from the scalable calculation modules according to the number of data to be processed.

Abstract: The present invention relates to a device for processing blocks of coded data included in a sequence of coded digital images (ES) according to a block-based coding technique, said device comprising a post-processing circuit DFD (33). Such a device effectively corrects the blocking artifacts while minimizing the bandwidth used, the decoder directly transmitting decoded data blocks (B) to the post-processing circuit. In addition, such a device introduces no or little drift during the decoding since the decoder continues to use reference images (RB) during a motion compensation step. This is because the reference images are no longer the decoded images but the completely processed images as the post-processing circuit is situated in the decoding loop.

Abstract: In a system integrating modules (PROC) designed for a time-slotted resource-accessing scheme and modules (PROC′) designed for accessing a common resource based on request-arbitration, a request-arbitration scheme is used for managing access to a common resource. The module(s) (PROC) designed for a time-slotted resource-accessing scheme are associated with an anticipatory request generator (ARG) adapted to generate, and forward to the arbiter (P_ARB), anticipated requests produced ahead of the time instants when the associated modules are designed to make access requests. A data buffer (DATA BUF) is also associated with each of the modules designed for a time-slotted resource-accessing scheme, so as to hold data obtained as a result of an anticipated request until the time instant when the module generates the request associated with this data.

Abstract: The present invention relates to a method of and an arrangement for processing data comprised in a digital input image. Said arrangement comprises a decoder unit (20) intended for transmitting a decoded analog image (S2) to a television receiver (27) via a channel CH (23). The decoder unit includes a device MPD (21) by means of which the encoded digital image (S1) can be decoded and a digital to analog converter DAC (22). The television receiver includes an analog to digital converter ADC (24) intended for supplying a digital input image (S3) to a device DET (25) by means of which it is possible to detect if said digital input image has been encoded in accordance with a block-based encoding technique. A correction or post-processing device COR (26), whose operation depends on the data supplied by the detection device, thus enables the display quality of the digital image to be improved in view of its display on the screen.