Video Recording Device Index Integration for Fast Power Restoration
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Solution Overview
Problem
Conventional video recording apparatuses experience significant delays in starting recording again after a power supply interruption due to inconsistencies between index information and video data, requiring restoration processes that take considerable time.
Innovation Solution
A video recording apparatus with a circulating file system that integrates index information into the video data area, allowing for efficient initialization by searching for the latest MB block and synthesizing index information upon startup, thereby reducing the time needed to resume recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If index information is stored separately from video data in conventional circulating recording apparatuses, then data organization is simplified, but restoration time after power interruption increases significantly
Solution Approach 1:
The patent combines index information and video data into a single integrated file structure. Each video file contains both the video data and its corresponding index information as embedded components, eliminating the need for separate index storage areas. This merging allows the system to restore only the necessary portions of video files after power interruption, rather than requiring complete restoration of separate index structures, thereby significantly reducing restoration time.
Solution Approach 2:
The patent segments the video recording system into independent video file units, where each segment contains both video data and its associated index information. This segmentation allows the system to independently process and restore individual video files without affecting other segments, enabling faster and more efficient restoration after power interruptions by only restoring affected segments rather than the entire index structure.
2Reliability
If index information is updated at lower frequency than video data recording, then write operations are reduced, but data consistency after power interruption deteriorates
Solution Approach 1:
The patent incorporates index information creation as a preliminary action during the video data recording process itself. As video data is written to the storage medium, the corresponding index information is simultaneously generated and embedded within the same file structure. This preliminary action ensures that data consistency is maintained from the moment of recording, eliminating the need for separate update operations and preventing consistency issues after power interruptions while maintaining high recording efficiency.
3Ease of operation
If separate index information area is used, then data access is simplified, but startup processing time after power restoration increases
Solution Approach 1:
The patent merges index information and video data into an integrated file structure where both are accessible through the same file access mechanisms. This merging maintains ease of data access by using standard file I/O operations while eliminating the need for separate index area processing during startup. The system can directly access video files and their embedded index information without additional lookup operations, reducing startup processing time after power restoration.
Data Source
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AI summary
Disclosed is a method for reducing the time from reactivation of a power supply following disconnection of the power supply to the start of recording in a constantly operating video recording apparatus. The recording apparatus is provided with a recording device having a location information area and a video data area. In the location information area, location information of video data stored in the video data area is stored. In the video data area, the video data are stored in units of blocks with a size of 1 MB or greater. The tail end of the block is used as a table of contents region for storing table of contents information of a plurality of the most-recent blocks. By providing the table of contents regions at a predetermined frequency, the tables of contents of all blocks being used in the video data area are retained in a distributed and redundant manner. Each time the power supply is re-activated, the tables of contents regions are read, and pieces of the table of contents information are joined appropriately to construct a complete table of contents in memory. The need for recording the tables of contents of all blocks at one location on a recording device is eliminated.