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Structured light projection device and depth camera

A technology for structured light projection and projection device, which is applied in optics, photography, instruments, etc., and can solve problems such as high cost, poor depth image, and large-area voids.

Active Publication Date: 2017-08-22
SHENZHEN ORBBEC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the problems faced by the current structured light depth camera in use is that when the measurement areas of multiple depth cameras overlap, the obtained depth image will be poor, and even large areas of holes will appear.
Even so, realizing the above-mentioned anti-jamming methods all need to spend relatively large cost

Method used

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  • Structured light projection device and depth camera
  • Structured light projection device and depth camera
  • Structured light projection device and depth camera

Examples

Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides a structured light projection device, in which the structured light pattern emitted into the target space is a laser infrared speckle pattern. like Figure 2a As shown, the structured light pattern 200 is a kind of speckle particle pattern. The difference from the prior art is that the distribution density of the particles in the pattern 200 changes along the lateral direction, specifically refers to the increasing particle distribution density in the lateral dimension. smaller. As shown in FIG. 2 , when a sub-region of the pattern is selected, it can be clearly seen that the number of particles in the sub-region 201 on the left is greater than that in the sub-region 202 on the right. In other embodiments, the distribution density of the particles increases in the transverse dimension.

[0038] Figure 2b The pattern 210 shown is when two depth cameras are placed side by side and the measurement volumes partially overlap. The pattern 210 can...

Embodiment 2

[0042] This embodiment provides a structured light projection device, in which the structured light pattern emitted into the target space is a laser infrared fringe pattern. like Figure 3a As shown, the structured light pattern 300 is composed of a plurality of rectangular sub-patterns, and the left side of the pattern is a vertical rectangle, and the right side is a horizontal rectangle. Therefore, the structured light pattern 300 also changes in the lateral direction, but the shape changes instead of the density change. It can be extended that, in other embodiments, the right side can also be in other styles such as a circle, that is, the pattern changes along the horizontal direction.

[0043] Figure 3b What is shown is the situation where the structured light pattern 300 overlaps left and right. It can be seen that in the overlapping area, due to the different shapes of the rectangles, even if the rectangles are coupled together, the vertical and horizontal aspects of ...

Embodiment 3

[0046] The structured light patterns in Embodiments 1 and 2 change along a certain direction, and the structured light patterns of multiple depth cameras can only overlap along this direction when overlapping, otherwise it is difficult to achieve the anti-interference effect. For example, when the density of the structured light pattern changes along the left and right, and the corresponding depth camera partially overlaps up and down, the depth image acquired by the depth camera still cannot have a good effect.

[0047] It is necessary to design a structured light pattern that can overlap in any direction and achieve anti-interference.

[0048] Figure 4a The structured light pattern shown can be regarded as the center of the pattern as the origin, and changes with the polar coordinates as the radius increases, and the specific change is the shape of the sub-pattern (the change in the radius). The sub-pattern shown in the figure is in the shape of a whole ring, or it may be ...

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Abstract

The invention provides a structured light projection device which comprises a light source and a pattern generator. A light beam emitted by the light source forms structured light patterns through the pattern generator, and the structured light patterns are emitted outwardly. The structured light patterns are changed in at least one dimension, so that the structured light patterns can be distinguished when at least a part of a number of structured light patterns are overlapped in at least one dimension. Compared with a depth camera disclosed in the prior art, the depth camera provided by the invention has the advantages that the problem of interference is solved from the source; the structured light patterns emitted by a projection module are changed, so that the structured light patterns can vary along a certain dimension; when the measurement spaces of a number of depth cameras are partially overlapped, the structural light patterns in the overlapping area can still be clearly distinguished; the acquisition of a depth image is not influenced by pattern overlapping; and anti-jamming is realized.

Description

technical field [0001] The invention relates to the technical field of optical projection and measurement, in particular to an anti-interference structured light projection device and a depth camera. Background technique [0002] Depth cameras based on structured light are currently widely used in somatosensory games, robotics and UAV vision systems due to their advantages of high precision and fast acquisition speed. The depth camera projects a fixed structured light pattern to the target space through the projection module, and then the acquisition camera in the depth camera collects the structured light image of the target space, and calculates the depth image of the target space according to the decoding of the structured light image . [0003] One of the problems faced by the current structured light depth camera in use is that when the measurement areas of multiple depth cameras overlap, the acquired depth image will be poor, and even large areas of holes will appear....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B15/02G03B30/00
CPCG03B15/02
Inventor 黄源浩肖振中刘龙许星
Owner SHENZHEN ORBBEC CO LTD
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