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Method for Removing Background Light in Structured Light Imaging

A technology of structured light imaging and background light, which is applied in the direction of image communication, color TV parts, TV system parts, etc., can solve the problems of occupying the photosensitive unit area and adverse effects on pixel performance, so as to save storage space and avoid Adverse effects, effects of avoiding data errors

Active Publication Date: 2022-05-24
GPIXEL
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] In view of the above problems, the purpose of the present invention is to provide a method for removing background light in structured light imaging to solve the problem that the pixel performance is adversely affected due to the addition of storage units in the pixels of the global shutter and the occupation of the area of ​​the photosensitive unit

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  • Method for Removing Background Light in Structured Light Imaging
  • Method for Removing Background Light in Structured Light Imaging
  • Method for Removing Background Light in Structured Light Imaging

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Embodiment Construction

[0043] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0044] Glossary

[0045] Rolling shutter: At the beginning of the exposure, one row of pixels is now cleared, and then the signal value of the row is read out after the exposure time has elapsed. Clearing / exposure / readout are performed in line-by-line order.

[0046] Global shutter: At the beginning of exposure, all pixels are now cleared to zero, and then after the exposure time has elapsed, the pixel signal values ​​are read out row by row. The main difference between the global shutter and the rolling shutter is that the global shutter adds a memory unit to each pixel.

[0047] In ...

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Abstract

The invention discloses a method for removing background light in structured light imaging, which includes: S1, the front and rear two frames of images respectively adopt the global shutter exposure method and the rolling shutter exposure method to expose all pixels of the image sensor, and each pixel is accumulated after exposure. The structured photocharges and the background photocharges are separately stored in the same storage unit according to the charge type and sequence; S2. The readout circuit reads the structure corresponding to the structured photocharges of each pixel in the storage unit row by row according to the sequence. The photovoltage and the background photovoltage corresponding to the background photocharge of each pixel; S3, the readout circuit subtracts the read structured photovoltage of each pixel from the background photovoltage to remove the background light. The present invention achieves the effect of two-frame subtraction by sharing the storage unit, does not increase the number of storage units, occupies too much area of ​​the pixel, does not need to reduce the size of the photosensitive unit, and avoids adverse effects on the performance of the pixel.

Description

technical field [0001] The invention relates to the technical field of structured light imaging, in particular to a method for removing background light in structured light imaging. Background technique [0002] At present, structured light imaging technology has begun to be widely used in business, such as face recognition, security monitoring, industrial inspection and other fields. The three-dimensional visual imaging of structured light is realized based on the principle of optical triangulation. like figure 1 As shown, the structured light 3D vision system includes an optical projector 1 and a camera 2. The optical projector transmits a light pattern of a certain mode (such as an infrared laser dot matrix) on the surface of an object, forming a pattern on the surface modulated by the surface shape of the measured object. The three-dimensional lattice image of , the three-dimensional image is detected by the camera at another position, so as to obtain the two-dimension...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/355H04N5/359H04N5/378
CPCH04N25/589H04N25/59H04N25/62H04N25/75H04N25/616H04N25/771
Inventor 马成王欣洋李扬贾恩·柏加兹
Owner GPIXEL