Image Signal Detection Circuit Using Capacitive Frame Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current motion detection methods in image sensors are limited by analog-to-digital conversion time, leading to reduced frame rates and increased system cost due to the need for additional area and power consumption.
Innovation Solution
An image signal detection circuit utilizing capacitor charge coupling to compare consecutive frames without analog-to-digital conversion, allowing for faster motion detection and reduced development costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital signal comparison method is used for motion detection, then motion detection can be performed, but the readout time is limited by analog-to-digital converter conversion time, reducing maximum frame rate
Solution Approach 1:
The patent extracts and removes the analog-to-digital conversion step from the motion detection process. By directly comparing analog signals from the pixel array without converting to digital format, the system eliminates the conversion time bottleneck that limits frame rate, thereby resolving the contradiction between productivity and time loss.
Solution Approach 2:
The patent replaces the digital signal processing mechanism with an analog signal comparison mechanism. Instead of converting analog signals to digital and then comparing them, the system performs direct analog signal comparison using differential amplifiers, substituting the mechanical/digital conversion process with an analog processing approach that eliminates conversion time limitations.
2Reliability
If ISP is added on-chip or off-chip for digital signal comparison, then motion detection can be performed, but additional area and power consumption are required, increasing system cost
Solution Approach 1:
The patent merges the motion detection function directly into the pixel array structure by implementing analog signal comparison at the sensor level. This integration eliminates the need for separate ISP modules or additional digital signal processing circuits, thereby reducing device area and power consumption while maintaining motion detection reliability.
Solution Approach 2:
The pixel array structure performs motion detection autonomously through self-contained analog signal comparison circuits within each pixel or pixel group. This self-service approach eliminates the need for external or additional ISP processing modules, reducing overall system complexity, area, and power consumption while maintaining detection accuracy.
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
The solution enhances processing speed and reduces system costs by eliminating the need for analog-to-digital conversion and software assistance, while maintaining a simple and cost-effective architecture.
Implementation Method 1
utilizing capacitor charge coupling to compare consecutive frames
Data Source
AI summary
The present invention is to provide an image signal detection circuit, a control method, and a motion detection method. The image signal detection circuit comprises at least one acquisition module, the acquisition module comprises at least one acquisition sub-module, the acquisition sub-module comprises a capacitor to acquire the difference between a pair of two consecutive frames of pixel signals by taking a reference voltage as a reference. The image signal detection circuit and a motion detection circuit are structurally simple and easy to implement. It can realize motion detection at increased difference detection speed without analog-to-digital conversion.