3D Depth Perception Apparatus with Adjustable Laser Driving Current
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Solution Overview
Problem
Existing three-dimensional depth perception devices lack an adjustable working range, limiting their ability to accurately identify gestures and somatosensory actions across various distances, from near-range to several meters, and cannot track pedestrians at farther distances effectively.
Innovation Solution
A method and apparatus that adjust the driving current and output power of a laser pattern projector, the focal length of a receiving camera, and the baseline distance, along with control parameters for image pre-processing, to select the appropriate reference encoded images for block-matching-based disparity computation and depth computation, allowing for high-resolution and high-accuracy depth information across different working ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed working range is designed for near-range gesture identification, then gesture recognition accuracy is improved, but the ability to track pedestrians at farther distances deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the laser pattern projector's driving current and output power based on detected target distance. When a target is far away, the system increases the driving current to enhance projection brightness and extend the working range, while for near-range targets, it reduces the current to maintain optimal brightness for gesture recognition. This dynamic parameter adjustment allows the same apparatus to adapt to different working ranges effectively.
Solution Approach 2:
The system changes the operating parameters of the laser pattern projector by adjusting the driving current according to the detected distance. The control module receives distance information and dynamically modifies the driving current parameter to optimize performance for the current working range, enabling the device to switch between near-range gesture identification and far-range pedestrian tracking modes.
2Length of moving object
If high driving current is used to extend working range, then detection distance is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts the driving current based on the actual detection distance requirements. When targets are far away, high driving current is applied to extend detection distance. When targets are nearby, the driving current is reduced to minimize energy consumption. This dynamic adjustment ensures energy is only consumed at high levels when necessary for far-range detection.
Solution Approach 2:
The control module modifies the driving current parameter of the laser pattern projector based on detected target distance. For far-range detection, the parameter is increased to extend working range. For near-range detection, the parameter is decreased to reduce energy consumption, achieving optimal energy efficiency across different operating conditions.
3Adaptability or versatility
If multiple sets of apparatus are used to cover different distance ranges, then working range coverage is improved, but device complexity increases
Solution Approach 1:
The patent makes a single depth perception apparatus universal by enabling it to perform both near-range gesture identification and far-range pedestrian tracking through dynamic parameter adjustment. The laser pattern projector can operate at different driving current levels to serve multiple working range requirements, eliminating the need for separate apparatus for different distance ranges and reducing overall system complexity.
Solution Approach 2:
The system uses dynamic parameter adjustment to allow one apparatus to cover multiple working ranges. By changing the driving current and output power based on detected distance, a single device can adapt to function effectively at both near and far distances, replacing what would otherwise require multiple specialized devices.
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
Enables a single three-dimensional depth perception apparatus to obtain accurate depth information within diverse working distance ranges, facilitating natural human-machine interaction and action capture across near and far distances.
Implementation Method 1
projecting, with infrared laser, images of a fixed mode onto a surface of an object
Implementation Method 2
collecting, by an image sensor, infrared encoded images
Data Source
AI summary
The present invention discloses a three-dimensional depth perception method and apparatus with an adjustable working range. The method comprises: setting a working range mode from the external or by an adaptive adjustment, projecting encoded patterns into a corresponding working range by adjusting a driving current of a laser pattern projector driving circuit, adjusting a receiving camera focal length and a baseline distance, collecting a sequence of projected encoded images and feeding them into a depth perception module that adjusts control parameters for image preprocessing based on the working range mode, selecting, from a group of reference encoded images in coincidence with the working range mode to perform block-matching-based disparity computation and depth computation to the inputted encoded image sequence, and outputting a depth image sequence. A three-dimensional depth perception apparatus with an adjustable working range is implemented based on the method. The apparatus facilitates optimization and real-time implementation of the depth perception computation method and makes it adapted to different working ranges, thereby breaking through application limits of the existing three-dimensional depth perception apparatuses.