Imaging Device Image Transform Circuitry Motion Detection
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Solution Overview
Problem
Existing imaging devices face challenges in accurately detecting motion due to the sensitivity of passive infrared sensors to heat movement, leading to false triggers and unnecessary energy consumption.
Innovation Solution
Incorporating transformation circuitry, such as a discrete cosine transform, into imaging devices to analyze image data from sequential frames and improve motion detection accuracy by distinguishing between motion and heat-related changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a passive infrared sensor is used for motion detection, then motion detection capability is provided, but false triggers occur due to sensitivity to heat movement and energy is consumed unnecessarily
Solution Approach 1:
The patent segments the detection function by using multiple sensors (passive infrared sensor and image sensor) with different detection mechanisms rather than relying on a single sensor type. This allows the system to divide the detection task between heat-based motion detection and visual-based verification, reducing false triggers while maintaining energy efficiency
Solution Approach 2:
The processing unit acts as an intermediary that receives signals from the passive infrared sensor and verifies them using the image sensor before triggering the image capture. This intermediary verification step filters out false positives from heat-based detection while maintaining the energy-efficient wake-up mechanism
2Measurement precision
If a passive infrared sensor is used for motion detection, then motion detection capability is provided, but false triggers occur due to sensitivity to heat movement
Solution Approach 1:
The system implements feedback by using the image sensor to verify motion detection events triggered by the passive infrared sensor. The processing unit analyzes the image data to confirm actual motion before triggering, creating a feedback loop that eliminates false positives from heat sensitivity while maintaining reliable motion detection
Solution Approach 2:
The image sensor and processing unit serve as an intermediary verification layer between the passive infrared sensor trigger and the final image capture. This intermediary step filters out false triggers caused by heat movement while preserving genuine motion detection events
Data Source
AI summary
An imaging device may include an image sensor that generates frames of image data in response to incident light with an array of image pixels, and processing circuitry that processes the image data. The processing circuitry may include a transformation circuit that applies transforms to subsampled frames of image data that are generated using a subset of the image pixels to produce transform values, and a comparator circuit that compares the transform values. The processing circuitry may determine that motion has occurred between sequential frames if a difference between a first transform value corresponding to a first image frame and a second transform value corresponding to a second image frame exceeds a threshold value. In response to determining that motion has occurred, the image sensor may generate full-frame image data using all of the pixels of the array of image pixels.