Dashcam Motion Sensing for Low-Power Pre-Impact Recording
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Solution Overview
Problem
Dashboard cameras in vehicles consume excessive power due to continuous recording, even when the vehicle is stopped, and record unnecessary images of non-threatening objects, leading to battery discharge and memory limitations.
Innovation Solution
A video recording apparatus with a motion detection sensor, controller, and image processor that activates only when a detected object meets specific motion criteria, using radar for motion sensing and low voltage differential signaling to conserve power and reduce unnecessary recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous video recording is performed to capture all events, then no important moments are missed, but power consumption increases excessively and memory capacity is limited
Solution Approach 1:
The system performs video recording periodically based on detected events rather than continuously. The motion detection sensor triggers recording only when motion is detected, creating an event-driven periodic recording pattern that reduces power consumption while maintaining recording completeness for important moments
Solution Approach 2:
The motion detection sensor performs preliminary detection before video recording is activated. This preliminary action filters out non-event periods, allowing the system to prepare for and activate recording only when necessary, thereby reducing overall power consumption while ensuring important events are captured
2Use of energy by moving object
If impact detection recording is used to reduce power consumption, then battery discharge is prevented, but videos before impact cannot be recorded
Solution Approach 1:
The motion detection sensor performs preliminary detection before impact occurs, triggering the video recording function in advance. This preliminary action ensures that recording is already active when impact happens, capturing both pre-impact and impact footage while maintaining lower power consumption compared to continuous recording
Solution Approach 2:
The motion detection sensor acts as an intermediary between the impact event and the video recording function. It detects motion patterns and triggers recording appropriately, serving as a mediator that enables pre-impact recording while managing power consumption more efficiently than direct impact-triggered recording
3Measurement precision
If the image processor is activated continuously to monitor external objects, then all motion can be detected, but power consumption increases
Solution Approach 1:
The system segments the monitoring function into two parts: the motion detection sensor performs initial motion detection, and the image processor is activated only when motion is detected. This segmentation allows motion detection accuracy to be maintained while reducing power consumption by keeping the image processor inactive during non-event periods
Solution Approach 2:
The image processor is activated periodically based on motion detection events rather than continuously. This periodic activation maintains motion detection accuracy when needed while significantly reducing power consumption during idle periods when no motion is present
4Reliability
If video recording is performed for all detected objects, then no important evidence is missed, but unnecessary images consume memory storage
Solution Approach 1:
The controller acts as an intermediary that receives sensing data from the motion detection sensor and determines whether to activate the image processor for video recording. It filters out non-threatening objects by analyzing motion patterns, signal strength, and distance, triggering recording only for objects that meet threat criteria, thus maintaining evidence completeness while reducing unnecessary storage usage
Solution Approach 2:
The system uses feedback from the motion detection sensor's sensing data (signal strength, distance, motion patterns) to dynamically control video recording activation. This feedback mechanism ensures that recording is triggered only when appropriate threat levels are detected, maintaining evidence completeness while preventing unnecessary memory consumption from non-threatening objects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces power consumption and prevents unnecessary image recording by selectively activating the image processor based on object motion, ensuring efficient use of battery power and memory storage.
Implementation Method 1
a motion detection sensor... The motion detection sensor may sense motion of an external object outside of a vehicle
Implementation Method 2
the motion detection sensor may obtain sensing data in a digital format at specific intervals based on a reception signal of radar
Data Source
AI summary
The present disclosure relates to a video recording apparatus and a controlling method thereof. According to an embodiment of the present disclosure, a video recording apparatus may include a motion detection sensor, a controller, and an application processor. The motion detection sensor may sense motion of an external object outside of a vehicle. The controller may be activated if the motion detection sensor senses motion of the external object and may monitor the external object through the motion detection sensor during a predetermined time period. An image processor may be activated based on a monitoring result of the external object so as to perform a video recording function.