Motion Detection Solid-State Image Capturing Device
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Solution Overview
Problem
Existing motion detection systems in solid-state image-capturing devices face challenges with high power consumption, inaccurate motion detection, especially under low illumination, and erroneous signal detection due to the Bayer color filter arrangement, which affects the accuracy and efficiency of motion detection.
Innovation Solution
A motion detection system that divides the pixel section into sections for long-period and short-period accumulation, using a vertical parallel control circuit and horizontal combination circuit to combine signals, and includes a differential signal generation circuit for accurate motion determination, reducing power consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame memory is used for motion detection based on comparison between signal outputs of the same pixel from two consecutive frames, then motion detection capability is achieved, but circuit scale increases and power consumption increases
Solution Approach 1:
The patent extracts only the necessary function for motion detection by comparing signals from the same pixel at different times, eliminating the need for complete frame storage. The differential signal generation circuit generates motion detection signals by comparing current frame pixel signals with previous frame pixel signals, removing the frame memory component entirely.
Solution Approach 2:
The patent applies different accumulation times to different pixel sections (first section with first accumulation time, second section with second accumulation time) to optimize motion detection for local characteristics. This local differentiation allows efficient motion detection without uniform high-power operation across the entire sensor.
2Adaptability or versatility
If integration time is varied while treating adjacent pixels as a pair to adjust gain for motion detection, then gain adjustment is achieved, but differential signals are generated at edge portions of objects resulting in poor motion detection accuracy
Solution Approach 1:
The patent segments the pixel array into distinct sections (first pixel section and second pixel section) with different accumulation times, avoiding the pairing of adjacent pixels that causes edge artifacts. Each section independently accumulates signals for its designated time period, preventing false differential signals at pixel boundaries.
Solution Approach 2:
Instead of varying integration time across adjacent pixels as pairs (which causes edge problems), the patent inverts the approach by assigning different accumulation times to spatially separated sections, comparing signals from the same pixel location across different time accumulations rather than adjacent spatial locations.
3Adaptability or versatility
If pixel signals of the same G color are used in Bayer arrangement for motion detection, then color video image capture is enabled, but erroneous detection signals increase and motion detection accuracy deteriorates
Solution Approach 1:
The patent segments the pixel array into sections with different accumulation times, and the differential signal generation compares signals from corresponding pixel positions rather than relying on color filter patterns. This approach bypasses the Bayer arrangement's inherent issues with motion detection by using spatially corresponding pixels regardless of their color filter type.
Solution Approach 2:
The patent extracts motion detection capability by comparing signals from the same pixel position across different accumulation periods, removing the dependency on color filter arrangements (Bayer pattern) for motion detection. The color information is captured but the motion detection mechanism operates independently of the color filter grid.
4Reliability
If the motion detection operation continuously monitors for moving objects, then motion detection coverage is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic motion detection by alternating between different accumulation time patterns. The first pixel section accumulates for a first period while the second section accumulates for a second period, creating a periodic detection cycle that maintains coverage while reducing average power consumption compared to continuous high-rate detection.
Solution Approach 2:
The patent applies different accumulation periods to different spatial sections (first pixel section and second pixel section), allowing localized optimization of detection sensitivity and power consumption. Each section operates with its own timing characteristics, enabling efficient power management while maintaining overall motion detection coverage.
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
This approach significantly reduces power consumption, enhances motion detection accuracy, and improves sensitivity under low illumination by minimizing false signals and noise, leading to more reliable motion detection.
Implementation Method 1
Each pixel section of a CMOS sensor-type solid-state image-capturing device includes a photoelectric conversion unit (hereinafter referred to as a pixel) for generating a signal charge according to the incident light
Data Source
AI summary
An object is to provide a motion detection solid-state image-capturing device and a motion detection system having a reduced power consumption and an improved motion detection accuracy. One solution is to combine together signals of a longer exposure time for a plurality of pixels and signals of a shorter exposure time for a plurality of pixels, which signals are output from a motion detection image-capturing device, and to determine the presence/absence of a moving object based on a differential signal between the signals of a longer exposure time and the signals of a shorter exposure time, wherein if it is determined that there is no moving object, at least part of a circuit of a motion detection image processing device or a video management device is stopped, thereby improving the detection accuracy and conserving the electric power.