公开(公告)号：US11467754B2

公开(公告)日：2022-10-11

申请号：US16959897

申请日：2018-12-26

Applicant: TSINGHUA UNIVERSITY ,  Timecho AI Technology Co. Ltd

Inventor： Jianmin Wang ,  Xiangdong Huang ,  Chen Wang ,  Jinrui Zhang ,  Jiaguang Sun

IPC: G06F3/06 ,  G06F16/22 ,  G06F16/901

Abstract: Provided are a capacity expansion method and a capacity expansion system based on a dual-level list structure; a first level list of the dual-level list structure is a first-level array in which at least one array identifier is stored; a second level list of the dual-level list structure includes at least one second-level array, each second-level array stores data to be stored and corresponds to only one array identifier; the method includes: creating a new first-level array when an amount of data stored in the second-level array corresponding to each array identifier reaches a maximum value, a size of a new first-level array being greater than that of a current first-level array, and increasing a number of the second-level arrays; and copying the array identifier stored in the current first-level array to the new first-level array, and replacing the current first-level array with the new first-level array.

公开(公告)号：US11704328B2

公开(公告)日：2023-07-18

申请号：US16769151

申请日：2018-12-20

Applicant: TSINGHUA UNIVERSITY ,  Timecho AI Technology Co. Ltd

Inventor： Jianmin Wang ,  Xiangdong Huang ,  Chen Wang ,  Jialin Qiao ,  Tian Jiang ,  Mingsheng Long ,  Jiaguang Sun

IPC: G06F16/00 ,  G06F16/2458 ,  G06F16/22 ,  G06F16/248

CPC classification number: G06F16/2474 ,  G06F16/221 ,  G06F16/248 ,  G06F16/2477

Abstract: A columnar storage method and a query method and system for time series data. The storage method includes: dividing a column of time series data into a plurality of pages, wherein each page stores a part of data points of the column of time series data and the sum of the data points stored in all the pages is all the data points in the column of time series data (S1); and setting two parts, i.e., a page header and a page body, for each page, storing summary index information of all the data points in the page in the page header of the page and storing data value information of all the data points in the page in the page body of the page (S2).

公开(公告)号：US20250150619A1

公开(公告)日：2025-05-08

申请号：US19013825

申请日：2025-01-08

Applicant: TSINGHUA UNIVERSITY ,  HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yaoyuan Wang ,  Mingsheng Long ,  Kaichao You ,  Ziyang Zhang ,  Ying Wang ,  Yunlong Zhan ,  Jianxing Liao ,  Jianmin Wang ,  Kanwen Wang

IPC: H04N19/587 ,  H04N19/42

Abstract: This application relates to a data storage method, a reading method, an apparatus, a storage medium, and a program product. The data storage method is applied to a processor and includes: (S1) obtaining event data; (S2) processing the event data, to obtain a plurality of data blocks and a plurality of corresponding metadata blocks, where each data block includes a part of processed event data, and each metadata block includes a start time, an end time, a quantity, and a compression manner of event data in a data block corresponding to the metadata block, and a storage address of the data block; and (S3) storing the plurality of data blocks into a first storage area, and storing the plurality of metadata blocks into a second storage area.

公开(公告)号：US11101818B2

公开(公告)日：2021-08-24

申请号：US16769913

申请日：2018-12-12

Applicant: TSINGHUA UNIVERSITY

Inventor： Jianmin Wang ,  Xiangdong Huang ,  Jialin Qiao ,  Chen Wang ,  Mingsheng Long

IPC: H03M7/40 ,  H03M7/30

Abstract: Provided are a method and device for storing time series data with adaptive length encoding, including: acquiring data values corresponding to timestamps according to a sequential order of timestamps; using a ratio of storage space values required to pre-store the previous n data values to storage space values required to pre-store rule information of a preset encoding rule and encoding data according to the previous n data values as a storage gain corresponding to the time at which the n-th data value is acquired; storing the rule information of the preset encoding rule and the encoding data corresponding to a previous n−1 data values when the storage gain corresponding to the time at which the n-th data value is acquired is less than that corresponding to the time at which the (n−1)-th data value is acquired.

公开(公告)号：US20250133304A1

公开(公告)日：2025-04-24

申请号：US19005911

申请日：2024-12-30

Applicant: TSINGHUA UNIVERSITY ,  HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yaoyuan Wang ,  Mingsheng Long ,  Kaichao You ,  Ziyang Zhang ,  Ying Wang ,  Yunlong Zhan ,  Jianmin Wang

IPC: H04N25/47 ,  G06V10/25 ,  G06V10/60

Abstract: This application provides an event data processing method, including: obtaining event data shot by an event camera, where the event data includes a timestamp of occurrence of an event, pixel coordinates, and a brightness change status; and generating an event frame matrix based on a plurality of pieces of event data within a preset time period, where a location of a matrix element in the event frame matrix corresponds to pixel coordinates, a value of the matrix element indicates whether there is an event at a corresponding pixel and an event polarity of a pixel with an event, if there is an event at the pixel, it indicates that brightness of the pixel is changed within the preset time period, or if there is no event at the pixel, it indicates that brightness of the pixel is not changed, and the event polarity includes increased brightness and decreased brightness.