Emitting Module Rectifying Unit for Depth Camera Point Cloud Uniformity
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Solution Overview
Problem
The accuracy of depth information obtained by existing depth cameras is poor due to pincushion distortion in the projected light field, leading to inaccurate depth measurements.
Innovation Solution
An emitting module with a light source, a MEMS scanning unit, and a rectifying unit is provided, where the scanning unit vibrates to reflect the light beam and the rectifying unit corrects the emission angle, ensuring points in the point cloud picture are arranged at equal intervals, thereby alleviating pincushion distortion and improving depth information accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a scanning portion is used to reflect the light beam, then the light beam can be scanned across the target, but pincushion distortion occurs in the projected light field
Solution Approach 1:
The patent introduces a rectifying unit that changes the optical parameters of the light beam path. By adjusting the emission angle of the light beam through the rectifying unit, the system compensates for the pincushion distortion caused by the scanning portion, transforming the distorted light field into a uniform point cloud distribution.
2Measurement precision
If the scanning portion vibrates to reflect the light beam, then depth information can be obtained, but the emission angle becomes distorted
Solution Approach 1:
The rectifying unit acts as a feedback mechanism that corrects the emission angle distortion introduced by the vibrating scanning portion. By continuously adjusting the light beam path through the rectifying unit, the system maintains uniform emission angles despite the vibration-induced distortion, thereby improving depth measurement accuracy.
3Measurement precision
If the light beam is projected onto the target, then depth information can be measured, but pincushion distortion affects the measurement accuracy
Solution Approach 1:
The rectifying unit modifies the optical parameters of the light beam before it reaches the target. By adjusting the emission angle through the rectifying unit, the system compensates for pincushion distortion, ensuring that the projected light field creates uniform point cloud distribution on the target, which is essential for accurate depth measurement.
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 the uniformity of the point cloud and significantly improves the accuracy of the depth information obtained by the depth camera, addressing the issue of pincushion distortion and resulting in more precise depth measurements.
Implementation Method 1
the scanning portion being configured to reflect the light beam emitted by the light source
Implementation Method 2
a rectifying unit, configured to rectify an emission angle of the light beam reflected by the scanning portion
Data Source
AI summary
An emitting module, a depth camera and a head mount display device are provided by the present application. The emitting module includes a light source, a scanning unit and a rectifying unit. The light source is configured to emit a light beam; the scanning unit includes a driving portion and a scanning portion, the driving portion is configured to control the scanning portion to produce vibration according to a preset rule, and the scanning portion is configured to reflect the light beam emitted by the light source; the rectifying unit is configured to rectify an emission angle of the light beam reflected by the scanning portion, so that a plurality of points included in a point cloud picture formed by projecting the light beam rectified by the rectifying unit on a preset plane is arranged at equal intervals in at least one direction.