Drive Recorder Segmented File Playback Control
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Solution Overview
Problem
Existing drive recorders for vehicles cannot instantly playback specific portions of recorded video that the user has missed while driving, requiring manual saving and review rather than immediate access.
Innovation Solution
A recording control apparatus and method that includes a drive recorder with an image acquisition unit, sound acquisition unit, and event detection unit, allowing users to request and play back the 'just-before' portion of the video using a dedicated button or operation, while continuing to record, by setting an overwrite-disabled attribute for the relevant moving image files and combining them if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If chase play recording is used, then continuous recording capability is improved, but immediate playback of arbitrary video portions is not available
Solution Approach 1:
The patent divides the continuous video recording into segmented moving image files with fixed time periods. Each file represents a specific time segment, allowing the system to quickly locate and playback specific portions without processing the entire continuous recording. This segmentation enables both continuous recording capability and efficient random access to specific time periods.
Solution Approach 2:
The patent performs preliminary organization of recorded video into time-segmented files during the recording process itself. By pre-structuring the video data into manageable segments with clear time boundaries, the system prepares the data in advance for rapid playback of any specific portion, eliminating the need for manual searching or processing of entire continuous recordings when playback is requested.
2Device complexity
If video is played back from head in chase play, then playback function is simple, but arbitrary portions other than head cannot be played back immediately
Solution Approach 1:
The patent segments the video recording into multiple fixed-time-period files, creating a structured format that enables efficient navigation to any time portion. This segmentation maintains relative simplicity in the playback mechanism while dramatically reducing the time required to access arbitrary video portions, as the system can directly jump to the relevant time segment rather than playing from the beginning.
Solution Approach 2:
The patent implements a dynamic playback system that can adaptively jump to different time portions based on user requests. The segmented file structure allows the playback function to dynamically access any time period within the recorded duration, transforming the static head-to-tail playback into a flexible system that maintains simplicity while enabling immediate access to arbitrary portions.
3Ease of manufacture
If moving image files are divided by time period, then file management becomes systematic, but combining files for playback increases processing complexity
Solution Approach 1:
The patent systematically divides video recordings into fixed-time-period files, creating a regular and predictable file management structure. This segmentation simplifies file organization, storage, and retrieval operations. When playback of arbitrary portions is requested, the system only needs to combine and process the specific segmented files relevant to that time period, rather than managing entire continuous recordings, thereby reducing processing complexity despite the segmented structure.
Solution Approach 2:
The patent extracts only the necessary time-segmented files from the complete recording set for playback. When a user requests playback of a specific time period, the system identifies and extracts only the relevant segmented files needed for that portion, leaving the rest of the file system undisturbed. This extraction approach maintains systematic file management while minimizing processing complexity during playback operations.
Data Source
Figure 1
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Figure 4
AI summary
In recording control apparatus, an image acquisition unit 12 acquires a video of a scene around a vehicle while the video is being captured. A recording control unit 20 sets a moving image file for recording the video being captured and acquired by the image acquisition unit 12, segmenting the video into predetermined units and records the video being captured in the moving image file until the predetermined unit is met. A display control unit 28 plays back the video recorded in the moving image file. A user operation reception unit 26 receives a user operation input from a user. When the user operation reception unit 26 receives a request to play back a just-before portion from a user while the video is being recorded, the recording control unit 20 sets a subsequent moving image file that will be a new recording destination of the video to switch to the new recording destination and closes a preceding moving image file that has been a recording destination, and the display control unit 28 plays back the video, starting at a point of time reached by going back from an end of the preceding moving image file by a predetermined period of time.