Pre-Roll Video Recording for Low-Power Event Surveillance
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Solution Overview
Problem
Video surveillance devices using battery-powered cameras face a challenge in balancing power consumption between continuous video recording (CVR) and event-based video recording (EVR), with CVR consuming excessive power and EVR potentially missing critical information due to delayed recording initiation and generating junk data.
Innovation Solution
Incorporating a pre-roll module that captures video at lower power consumption, allowing for event-based recording with a pre-recorded clip before the event, combined with a camera module for continuous recording post-event, ensuring comprehensive context capture without excessive power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If continuous video recording (CVR) is implemented, then comprehensive video surveillance data is provided, but power consumption becomes excessively high for battery-powered cameras
Solution Approach 1:
The patent segments the video recording function into two distinct modules: a pre-roll module for low-power continuous recording and a camera module for high-quality event recording. This segmentation allows the system to maintain comprehensive surveillance capability while significantly reducing overall power consumption by using the low-power module during normal operation and only activating the high-power module when events are detected.
Solution Approach 2:
The pre-roll module performs preliminary recording of video clips before events occur, capturing context information in advance. This preliminary action ensures that when events are detected, the system already has background video data, eliminating the need for delayed recording and ensuring complete event capture while maintaining low power consumption during the pre-recording phase.
2Use of energy by moving object
If event-based video recording (EVR) is implemented, then power consumption is reduced, but critical information may be missed due to delayed recording initiation
Solution Approach 1:
The pre-roll module continuously records video clips before events occur, performing preliminary recording action. When events are detected, this pre-recorded content is immediately appended to the event video, ensuring that no critical information is lost due to recording delays. The system thus achieves both low power consumption and complete event capture.
Solution Approach 2:
The patent merges the output of the pre-roll module and the camera module into a single complete video stream. The pre-roll video clips are seamlessly appended to the event video captured by the camera module, creating a unified recording that includes both the contextual pre-event information and the actual event footage, thereby eliminating information loss.
3Use of energy by moving object
If event-based video recording (EVR) is implemented, then power consumption is reduced, but junk data is generated due to unnecessary recordings
Solution Approach 1:
The patent applies local quality by differentiating the recording characteristics of the two modules: the pre-roll module operates with lower quality settings optimized for power efficiency during continuous recording, while the camera module uses higher quality settings activated only when events are detected. This localized quality adjustment reduces overall data volume and minimizes junk data generation while maintaining sufficient quality for event documentation.
Solution Approach 2:
The system implements partial action by recording only the necessary pre-event context through the pre-roll module rather than continuous high-quality recording. This partial recording approach captures sufficient contextual information without excessive data generation, reducing the amount of junk data while still providing adequate event context when needed.
Data Source
AI summary
Please replace the Abstract with the following:An electronic device and an operating method therefor, and a storage medium are provided. A method of operating an electronic device includes when operating the electronic device in a first operation mode: causing the electronic device to be in a first state in which a pre-roll module captures and records a video; causing the electronic device to enter a second state in response to an event being detected in which a camera module captures and records a video; determining whether a current image frame of the video captured by the camera module contains a target in response to a preset period of time having elapsed since the event is detected; causing the electronic device to be maintained in the second state in response to the target being contained; causing the electronic device to enter the first state in response to the target being not contained.