Depth-Sensing Device Using Alternating Projection Pattern Density
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Solution Overview
Problem
Traditional depth sensors have a limited working range that is not suitable for both near-field and far-field regions, requiring a solution to effectively capture depth information in both areas without changing the hardware structure.
Innovation Solution
A depth-sensing device and method that alternately projects projection patterns of different densities to the same field, allowing the device to capture and process images to generate separate depth maps, which are then merged to create a final depth map, effectively expanding the working range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional depth sensor uses a fixed camera lens structure, then the sensor can capture depth information within a specific depth of field, but it cannot simultaneously capture both near-field and far-field regions
Solution Approach 1:
The patent divides the depth sensing process into multiple segments by using different projection patterns (first projection pattern with lower density and second projection pattern with higher density) captured at different times. Each pattern segment captures depth information for different depth ranges, which are then merged to form a complete depth map covering both near-field and far-field regions.
Solution Approach 2:
The patent dynamically adjusts the projection pattern density based on the depth range being measured. The system switches between different projection patterns (low density for far-field, high density for near-field) depending on the capture time and depth requirements, making the depth sensor adaptable to varying working conditions without hardware changes.
Data Source
AI summary
A depth-sensing device and its method are provided. The depth-sensing device includes a projection device, an image capture device, and an image processing device. The projection device projects a first projection pattern to a field at a first time and projects a second projection pattern to the same field at a second time. The density of the first projection pattern is lower than the density of the second projection pattern. The image capture device captures the first projection pattern projected to the field at the first time to obtain a first image and captures the second projection pattern projected to the field at the second time to obtain a second image. The image processing device processes the first and second images to obtain two depth maps and at least merges the depth maps to generate a final depth map of the field.