Motion Judgment Chip for Low-Power Image Wake-Up Control
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Solution Overview
Problem
Electronic devices in low-power mode cannot effectively monitor for the presence of moving objects, leading to inefficiencies in power consumption and operational capabilities.
Innovation Solution
A control chip with a selection, buffer, calculation, and motion judgment circuit that compares reduced-resolution image macro-blocks between frames to detect motion, waking the CPU from low-power mode when changes are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the CPU operates in low-power mode, then power consumption is reduced, but the ability to monitor for moving objects is lost
Solution Approach 1:
The system is divided into two functional parts: a simple motion detection circuit that operates continuously at low power, and a full CPU that processes complex tasks. The motion detection circuit monitors image frames and triggers the CPU only when motion is detected, allowing the CPU to remain in low-power mode most of the time while maintaining monitoring capability.
Solution Approach 2:
A motion detection circuit acts as an intermediary between the image sensor and the CPU. This intermediary continuously monitors image frames for motion and only activates the CPU when necessary, enabling the CPU to sleep during static scenes while maintaining system-wide monitoring capability through the intermediary's continuous operation.
2Reliability
If the CPU operates continuously in normal mode, then monitoring capability is maintained, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the operational state of the CPU based on scene activity. The CPU transitions between low-power mode and normal mode depending on whether motion is detected, optimizing the balance between monitoring capability and power consumption in real-time based on environmental conditions.
Solution Approach 2:
The motion detection circuit periodically compares image frames to detect changes. By using periodic frame comparison rather than continuous processing, the system maintains monitoring capability while minimizing the time the high-power CPU needs to operate, thereby reducing overall power consumption.
3Measurement precision
If full image frames are compared, then motion detection accuracy is improved, but processing time and power consumption increase
Solution Approach 1:
The system extracts only the essential information needed for motion detection by comparing image frames and identifying changed regions. Rather than processing entire frames with full detail, the motion detection circuit extracts motion information from frame differences, reducing processing requirements while maintaining detection accuracy.
Solution Approach 2:
The system performs partial image comparison by focusing on detecting changes between frames rather than processing all image data. The motion detection circuit applies a threshold to frame differences and only triggers CPU intervention when changes exceed the threshold, performing just enough processing to achieve reliable motion detection without unnecessary computational overhead.
Data Source
AI summary
A control chip coupled to a central processing unit (CPU) and including a selection circuit, a buffer circuit, a calculation circuit, and a motion judgment circuit is provided. The selection circuit selects some of the first image macro-blocks of a first image frame and some of the second image macro-blocks of a second image frame. The buffer circuit stores the selected first and second image macro-blocks. The calculation circuit accesses the buffer circuit and calculates the differences between the selected first and second image macro-blocks to generate a calculated result. The motion judgment circuit determines whether the first and second image frames are the same according to the calculated result. In response to the second image frame not being the same as the first image frame, the motion judgment circuit wakes up the CPU so that the CPU enters a normal mode from a low-power mode.