Dual-Threshold Image Sensor for Distance Measurement
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Solution Overview
Problem
Conventional distance measuring devices are affected by ambient light, which interferes with accurate distance computation.
Innovation Solution
An image capturing device with a dual-sensing region image sensor, where object images are validated based on brightness thresholds, and a control circuit that filters out images below these thresholds to exclude ambient light interference in distance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single image sensor is used to capture object images for distance measurement, then the device structure remains simple, but ambient light interference degrades measurement precision
Solution Approach 1:
The image sensor is divided into multiple sensing regions (first sensing region and second sensing region), each with different sensing thresholds. This segmentation allows the system to differentiate between object images and flicker images based on which sensing region detects them, thereby eliminating ambient light interference and improving distance measurement accuracy.
2Measurement precision
If multiple sensing regions with different thresholds are introduced to filter ambient light, then measurement precision improves, but device complexity increases
Solution Approach 1:
Different sensing regions within the image sensor are assigned different local qualities (sensing thresholds). The first sensing region has a higher threshold while the second sensing region has a lower threshold. This local quality differentiation enables the system to distinguish object images from flicker images without requiring complex external filtering mechanisms.
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
Effectively reduces ambient light interference, ensuring accurate distance measurements by distinguishing and filtering out flicker images with lower brightness, thereby improving the reliability of distance computations.
Implementation Method 1
an image sensor configured to capture at least one object image generated by light from the light source or generated by ambient light
Data Source
AI summary
An image capturing device comprising an image sensor. The image sensor comprises: a first sensing region, having a first sensing threshold; and a second sensing region, having a second sensing threshold lower than the first sensing threshold. At least one object image is determined to be invalid when the object image captured by the first sensing region has brightness formation lower the first sensing threshold. At least one the object image is determined to be invalid when the object image captured by the second sensing region has brightness formation lower the second sensing threshold. The present invention also discloses a distance measuring device using the image sensor.