Locker Motion Sensor Using Temporal Difference Pixels
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Solution Overview
Problem
Existing motion sensors require multiple frame buffers to store pixel data acquired at different times for motion detection, which is inefficient and resource-intensive.
Innovation Solution
A locker with a motion sensor that performs motion detection using a pixel matrix and a processor to identify object position and direction by analyzing temporal difference pixel data without the need for separate frame buffers, utilizing a hybrid difference calculation in the analog phase to detect motion and lift-up events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple frame buffers are used to store pixel data at different times, then motion detection capability is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent combines the functions of multiple frame buffers into a single frame buffer by using temporal difference calculation. Instead of storing complete image frames at different times, the system stores only the difference values between consecutive frames, thereby reducing memory requirements while maintaining motion detection capability.
Solution Approach 2:
The patent changes the parameter representation from storing complete pixel data to storing differential values. By calculating and storing only the temporal differences between consecutive frames, the system reduces the amount of data that needs to be stored and processed, thereby simplifying the device architecture.
2Measurement precision
If multiple frame buffers are used to store pixel data, then motion detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent changes from storing complete frame data to storing only temporal difference values. This parameter transformation significantly reduces the computational load and memory access requirements, thereby reducing power consumption while maintaining motion detection accuracy.
Solution Approach 2:
The patent extracts only the essential motion information (temporal differences) from complete frame data. By storing and processing only the difference values rather than complete frames, the system reduces energy consumption associated with memory operations and data processing.
3Productivity
If temporal difference calculation is performed without frame buffers, then resource efficiency is improved, but detection reliability may be compromised
Solution Approach 1:
The patent merges the temporal comparison function into the pixel circuit itself, allowing temporal difference calculation to be performed directly at the sensor level without requiring separate frame buffer storage. This integration maintains detection reliability while improving resource efficiency.
Solution Approach 2:
The pixel circuit performs self-service by automatically calculating temporal differences between consecutive frames and outputting only the difference values. This self-contained approach eliminates the need for external frame buffers and maintains reliable motion detection through built-in temporal comparison.
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
Enables efficient and resource-effective motion detection and lift-up identification within the locker, reducing power consumption and improving detection accuracy by analyzing temporal and spatial differences in pixel data.
Implementation Method 1
The pixel matrix has a plurality of pixels arranged in a matrix, and each of the plurality of pixels is used to output a temporal difference pixel data
Data Source
AI summary
There is provided a locker with a motion sensor. The motion sensor identifies whether an object is put into or taken out from the locker by calculating coordinates of the object using a motion detection algorithm, by calculating a moving vector of the object using an image time differential algorithm or by comparing a current image frame and a background image frame, and outputs a put-in signal and a taken-out signal to a post control system.