Multi-Camera Standby Power Management via Frame Rate Control
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Solution Overview
Problem
Mobile devices with multiple cameras face increased power consumption, necessitating efficient power management strategies to reduce standby mode power usage and transition times between active and standby modes.
Innovation Solution
Implementing a mobile device with multiple cameras that supports sensor standby mode, low frames per second (FPS) post standby mode, and normal FPS post standby mode, where at least one camera can operate in a standby state with reduced power consumption and frame rates, and the processor only processes image data from active cameras.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple cameras are employed in a mobile device, then various camera functions are provided, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the frame rate of cameras based on operational state. In standby mode, the frame rate is reduced to a low frame rate (e.g., 1 FPS or lower), and in active mode, it returns to normal frame rate. This parameter adjustment allows the camera to maintain functionality while significantly reducing power consumption during standby periods.
Solution Approach 2:
The patent implements dynamics by introducing multiple operational modes (standby mode and active mode) that allow the camera system to adapt its behavior based on usage conditions. The camera can dynamically switch between these modes, adjusting its frame rate and processing activity accordingly, thereby optimizing the balance between functionality and power consumption.
2Use of energy by moving object
If a camera operates in standby mode with low frame rate, then power consumption is reduced, but mode transition time increases
Solution Approach 1:
The patent applies preliminary action by maintaining the camera sensor in a low-power standby state while keeping the basic operational structure ready. The sensor continues to operate at a minimal frame rate, maintaining readiness without full activation, thus reducing the time required to transition to full active mode while still achieving power savings compared to complete shutdown.
Data Source
AI summary
A mobile device is provided. The mobile device includes multiple cameras and a processor configured to perform image processing on image data output from the cameras. The mobile device supports, as a standby mode for one or more standby cameras from which an image is not provided among the multiple cameras, a sensor standby mode in which the one or more standby cameras does not perform an image sensing operation that generates the image data, a low frames per second (FPS) post standby mode in which the one or more standby cameras performs the image sensing operation that generates the image data with a low frame rate lower than a normal frame rate and the processor does not perform the image processing on the image data output from the one or more standby cameras, and a normal FPS post standby mode in which the one or more standby cameras performs the image sensing operation that generates the image data with the normal frame rate and the processor does not perform the image processing on the image data output from the one or more standby cameras.