Automatic Exposure Imaging System Motion Detection
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Solution Overview
Problem
Conventional imaging systems fail to timely detect motion when brightness changes abruptly from dark to bright due to the need for gradual adjustment of exposure time, leading to delayed or missed motion detection.
Innovation Solution
An automatic exposure imaging system with a multi-exposure controller that generates a sequence of different exposure times in each frame period during motion detection mode and outputs a determined exposure time in streaming mode, using an image sensor, analog-to-digital converter, single-frame image processor, exposure quantizer, and pixel controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If exposure time is gradually adjusted in conventional imaging systems, then exposure accuracy is improved, but motion detection timeliness deteriorates
Solution Approach 1:
The system pre-calculates and prepares multiple exposure time candidates before motion detection is needed. When brightness changes occur, the system can immediately select from pre-prepared exposure times rather than calculating them in real-time, thus resolving the contradiction between exposure accuracy and motion detection timeliness.
Solution Approach 2:
The system dynamically adjusts the number of exposure time candidates based on scene complexity and motion detection requirements. In high-motion scenarios, fewer candidates are used for faster processing, while in static scenes, more candidates are evaluated for optimal exposure, balancing accuracy and speed adaptively.
2Manufacturing precision
If multiple exposure times are evaluated to ensure accurate exposure, then exposure quality is improved, but processing speed deteriorates
Solution Approach 1:
The evaluation of multiple exposure times is divided into separate processing stages. Different exposure candidates are evaluated in parallel for different regions or features of the image, allowing the system to maintain high exposure quality while reducing overall processing time through divided computation.
3Measurement precision
If exposure time determination spans several frame periods, then appropriate exposure time is achieved, but motion detection capability deteriorates
Solution Approach 1:
The system performs preliminary exposure time determination within the same frame period as motion detection by preparing multiple exposure candidates in advance. This eliminates the dependency on several frame periods and ensures both accurate exposure and reliable motion detection occur simultaneously within a single frame period.
Data Source
AI summary
An automatic exposure (AE) imaging system includes an image sensor that captures an analog image; an analog-to-digital converter (ADC) that converts the analog image into a digital image; a single-frame image processor that processes the digital image; an exposure quantizer that generates a discrete number representing a determined exposure time according to an output of the single-frame image processor; a multi-exposure controller, under control of a motion-detect signal, generating a plurality of different exposure times in sequence in each frame period in a motion detection mode, and outputting the determined exposure time in a streaming mode; and a pixel controller coupled to receive an output of the multi-exposure controller, according to which the image sensor is controlled.