38 results about "File Fixity" patented technology

Data objects are delivered over a packet-switched network and receivers receive encoded symbols, such as repair symbols, broadcast or multicast, with sufficient information to form requests for additional symbols as needed based on what source symbols or sub-symbols are needed or missing. The requests can be made in a unicast or request fashion. Requesting and broadcasting might be done by different entities. A broadcast server can generate and store repair symbols while a source server can store content in source form. A request can be a unicast HTTP byte-range request, such as a URL, starting position and length. Requests might be aligned with starting positions of files. A receiver can calculate starting and ending byte positions of symbols or sub-symbols in a file and get indications that conventional HTTP servers are usable for file repair. Repair servers can request broadcast of repair data when byte-range requests from multiple receivers overlap.

The invention discloses a file repairing method and device based on an AVI format file structure. The method comprises the following steps: determining the encoding type of the damaged file; producing a source code AVI file of the same encoding type according to the encoding type of the damaged file; modifying the source code AVI file code, generate the source code repair file; merge the source code repair file and the damaged video file to get a new AVI repair file; use the player to open the AVI repair file, determine the original input size, resolution, bit rate, frame rate information; repair the AVI The file is transcoded, fill in the size, resolution, bit rate, frame rate information, output a new AVI file, and complete the AVI file repair. It can repair damaged AVI format files based on the hexadecimal code format of the underlying files of AVI format files. According to different file sizes and different damage methods, it can effectively repair and guide damaged AVI format files, so that the important video information in the file can be repaired. be restored.

The invention discloses a method for repairing data files. Step 1 arranges data elements into a matrix of M rows*N columns, requiring M to be roughly equal to N; Step 2 selects a reversible operation F, and its inverse operation f; Step 3 Initialize, perform continuous F operations on rows 1~M row by row, save them in 1~M arrays, perform continuous F operations on columns 1~N, and save them in arrays 1~N; check in step 4, perform cumulative sums on each row, Is it equal to the accumulated sum at the time of initialization? Get the number of wrong rows a, and the set of wrong row numbers X. If it is 0, it means that there is no error; And, get the wrong column number b, and wrong row number set Y; step 5 judge and repair. The present invention greatly improves the security of data on the premise of slightly increasing memory overhead, and greatly improves the reliability of key devices such as controllers and gateways in the field of industrial control.

The invention discloses a system and a method for realizing an on-demand file repair protocol. In the protocol, a data source sends all data packets in a data file to a data sink. Then, the data source sends an indication to the data sink that sending of all the data packets is completed. If a data packet is lost, a request to retransmit the lost data packet is received from the data sink. Then, the data source sends the fountain code of the lost data packet to the data sink.

Disclosed are an image repairing method and apparatus, and a storage medium. The method comprises: a detection step of detecting whether the header file of an image to be repaired is damaged, and if yes, obtaining a correct header file; a repair step of repairing the image to be repaired according to the correct header file so as to obtain a repaired image; and a correction step of correcting the location, brightness, and chrominance of the repaired image. By obtaining a complete JPG image header file generated by the same software or device as the header file for repairing a damaged picture so as to perform image repair, the present invention solves the technical problem that the image cannot be restored due to the missing of an image header file, further determines whether a coding region is covered by other data, if yes, restores the location of the data, and solves the technical problem that the restored data produces a blurred screen, and improves the restoration effect of the image.

The invention relates to an IP stream collection method based on fragmented files, comprising: signal reception; stream detection; stream analysis; stream slicing; stream collection; target file detection; file repair; file service. The present invention reduces the risk of unusable overall files caused by IP network data abnormality by judging the continuity of PCR and PTS / DTS, and adopting the IP fragmentation collection method of segmented files. IP fragmentation collection can not only realize 24-hour collection of signals, but also minimize the impact of signal problems. Using fragmented collection, the video and audio data in the time period of the problem signal can be separated to the greatest extent, and the entire file will not be unavailable due to the recording of video and audio data with wrong time stamps and other problems.

The embodiment of the present application discloses a file repair method and device, which are applied to audio and video files, and the audio and video files include code stream information of stored audio and video data, wherein the method includes: obtaining at least two bits of the audio and video files backup data, the backup time of the at least two backup data is different, and the at least two backup data include the size and time domain and space domain information of the code stream information of the audio and video data backed up respectively; The size of the code stream information of the video data and the size of the time domain and space domain information, determine the target backup data from the at least two backup data; the size and time of the code stream information of the audio and video data backed up according to the target backup data domain and airspace information, and repair the audio and video files. By adopting the embodiment of the present application, the efficiency of file restoration can be effectively improved, and the accuracy of file restoration can be ensured.

The invention relates to a file recovery system. The system comprises a BM-SC and a via network element, wherein, the system is also provided with a file recovery node which is connected with the via network element which controls the file recovery node, and the file recovery node is used for storing corresponding data block in dialog information forwarded by the via network element for realizingfile recovery; the via network element which controls the file recovery node also comprises a calculation module which is used for calculating the usable resource information of the file recovery nodes and a report module which is connected with the calculation module and used for reporting the status information of the file recovery node to the BM-SC; the BM-SC also comprises a distribution module which is used for generating the list of the file recovery node. The invention also relates to a file recovery method which comprises the steps of distributing dialog information and the file recovery node list by the BM-SC, storing the corresponding data block by the file recovery node and requesting file recovery from a terminal. The file recovery system reduces communication traffic when data is distributed and downloaded to the file recovery node and avoids the overload of the file recovery node.