摘要:
The present invention is to provide a decoder which detects a start code in a layered coded data stream on a layer basis. The decoder includes a unique pattern detector which detects a start code pattern in the layered coded data stream, a start code identifier which identifies the detected start code pattern based on a given condition, a similarity calculator which calculates similarity as an evaluation between an erroneously detected start code pattern and an expected start code based on layer, and a similarity based replacement identifier which replaces the erroneous start code pattern by the most appropriate replacement selected based on the similarity based evaluation, and otherwise the priority based replacement identifier which selects a replacement by the priority order.
摘要:
A method for transmitting pieces of synchronized picture data having the same data length of which each include a synchronizing signal, an identifying code, pieces of compressed picture data having different data lengths and an error correcting code in that order is disclosed. To correctly decode each of the compressed picture data, it is required to start an decoding operation from a head address of each of the compressed picture signal. Therefore, in cases where a head address of a piece of compressed picture data exists in a piece of synchronized, an existence information flag for informing the existence of the head address, an address pointer for indicating an address of the head address, and a block number for indicating a position of the compressed picture data having the head address are added just after the identifying code to correctly decode the compressed picture data and other pieces of following compressed picture data in the synchronized picture data. In contrast, in cases where any head address does not exists, a no-existence information flag for informing the no-existence of the head address is merely added just after the identifying code.
摘要:
L'invention concerne un procédé d'insertion d'échantillons représentant des données numériques issues d'une première source (1) ayant un premier débit (Fb) dans un signal numérisé issu d'une seconde source (3) ayant un second débit (Fp). Ce procédé est caractérisé en ce que le second débit (Fp) étant supérieur au premier débit (Fb), on associe chaque donnée (Bi) de la première source (1) à au moins un échantillon d'une série d'échantillons au second débit (Fp), les échantillons étant présentés à un filtre polyphase (6) dont chaque jeu de coefficients est associé à une erreur de phase (Phase) donnée précédemment introduite par ladite association, les échantillons filtrés étant inclus (8) dans le signal numérisé. L'invention a aussi pour objet un dispositif mettant en oeuvre le procédé ci-dessus. L'invention s'applique notamment à l'insertion, dans un signal vidéo numérisé, de données télétexte.
摘要:
A variable-length data alignment apparatus receives header data (MHD) and blocks (B1-B6) from different sources, forms a header (MH) based on the received header data (MHD) and outputs the header (MH) followed by blocks (B1-B6). The variable-length data alignment apparatus has a RAM (4) for storing the header data (MHD), and a buffer (3) for storing the blocks (B1-B6). A processor (5) produces a plurality of commands (C1-C4) and processes the header data (MHD) from said first memory means (4). The commands are prosecuted in multiplexer (8) and bit stream coder (9) to form header (MH) and to append said blocks (B1-B6) from said first memory means (4) after said header (MH).
摘要:
The present invention is to provide a decoder which detects a start code in a layered coded data stream on a layer basis. The decoder includes a unique pattern detector which detects a start code pattern in the layered coded data stream, a start code identifier which identifies the detected start code pattern based on a given condition, a similarity calculator which calculates similarity as an evaluation between an erroneously detected start code pattern and an expected start code based on layer, and a similarity based replacement identifier which replaces the erroneous start code pattern by the most appropriate replacement selected based on the similarity based evaluation, and otherwise the priority based replacement identifier which selects a replacement by the priority order.
摘要:
A method for transmitting pieces of synchronized picture data having the same data length of which each include a synchronizing signal, an identifying code, pieces of compressed picture data having different data lengths and an error correcting code in that order is disclosed. To correctly decode each of the compressed picture data, it is required to start an decoding operation from a head address of each of the compressed picture signal. Therefore, in cases where a head address of a piece of compressed picture data exists in a piece of synchronized, an existence information flag for informing the existence of the head address, an address pointer for indicating an address of the head address, and a block number for indicating a position of the compressed picture data having the head address are added just after the identifying code to correctly decode the compressed picture data and other pieces of following compressed picture data in the synchronized picture data. In contrast, in cases where any head address does not exists, a no-existence information flag for informing the no-existence of the head address is merely added just after the identifying code.
摘要:
A digital compressed video signal transmission system includes a transport processor for segmenting (105, 115) compressed data into transport cells for transmission. Particular portions of the compressed data are formatted (110, 120, 125) into further transport cells, which further transport cells are interspersed with normally occurring transport cells. The further transport cells include redundant video signal data which may be utilized to resynchronize a compressed video signal decoder after loss or corruption of transmitted data.
摘要:
In an ADRC processing, an image is divided into blocks, and the maximum value MAX and the minimum value MIN of the pixel values of each block are detected and the local dynamic range of each block is determined by the equation DR=MAX-MIN. The minimum value MIN is subtracted from the pixel values of each block, and the remainders are divided by DR/2 to obtain the result of the ADRC processing. The result is used as an object of various editing procedures which may be substantially identical with those when the original image, not subjected to the ADRC processing, is directly edited. The edition load can be reduced as compared with the edition of the original image, because the amount of data of the ADRC processing result is small. Hence the image processing is performed efficiently.