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Polarized flash laser lidar system and imaging method

A polar and laser technology, applied in the direction of camera devices, can solve the problems of large measurement influence, inability to provide three-dimensional structure and orientation information, large volume and weight, etc., and achieve the effect of improving accuracy and efficiency

Active Publication Date: 2020-05-15
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the limitations of its own grating projector structure and the measurement principle that relies on timing coding, white light photography equipment not only has a large volume and weight, but also needs a stable support structure such as a tripod to assist in shooting. The convenience is limited, and the brightness of the white light source is limited. Optical properties such as light and the color and material of the object itself are greatly affected. It is difficult to take effective photos in a bright environment or facing a darker color object.
Existing cameras can only draw two-dimensional graphics according to light intensity, and cannot provide information on the three-dimensional structure and orientation of the target, and traditional cameras cannot work in low-light-intensity environments or for low-light-intensity targets. In addition, traditional cameras cannot distinguish light Targets with similar contrast and color

Method used

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  • Polarized flash laser lidar system and imaging method
  • Polarized flash laser lidar system and imaging method
  • Polarized flash laser lidar system and imaging method

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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment provides a polarized flash laser lidar system, including: a laser transmitter 1, the laser transmitter 1 emits a narrow-band high-frequency long-wave laser pulse signal, and the active light source signal ensures polarity The normal operation of the flash laser lidar system in a low-light intensity environment, the high-frequency characteristics of the laser pulse signal, realize high-frequency image drawing, and ensure real-time drawing and video recording. The narrow-band and long-wave characteristics of the laser pulse signal make the emission signal It is different from noise signals of other wavelengths, and the signal is not easily absorbed by the target and the surrounding medium, improving the accuracy of the image and video recording of the polarized flash laser lidar system; the filter 2, which is set on the laser transmitter 1 to emit laser light After the target is scattered, the polarized flash laser lidar system r...

Embodiment 2

[0028] This implementation provides an imaging method for a polarized flash laser lidar system. The steps include:

[0029] 1) The laser transmitter periodically emits narrow-band laser pulses, the target surface scatters laser pulse scattered signals, and the filter filters non-laser pulse scattered signals;

[0030] 2) The polarized camera acquires the light intensity data of scattered signals whose polarization states of every four adjacent pixels are 0°, 45°, 90° and 135°;

[0031] 3) The timer acquires the propagation time of the scattering signal of each pixel image;

[0032] 4) The data processor obtains the scattering signal propagation time of each pixel image according to the timer, and calculates the distance value of each pixel image corresponding to the target; the polarization state obtained by the data processor according to the polarity camera is 0 °, 45°, 90° and 135° scattered signal light intensity values, calculate the total light intensity, polarization d...

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Abstract

The invention provides a polarity deflection flash laser lidar system and an imaging method. The polarity deflection flash laser lidar system comprises a laser transmitter, a filter, a polarity deflection camera, a timer, a data processor and an cameras, and the polarity bias camera obtains the light intensity values at multiple different angles of polarization; the timer obtains laser pulse scattered signal propagation time of each pixel image; the data processor is connected with the polarity deflection camera and the timer; the image camera is connected with the data processor. The imaging method comprises the steps that the laser transmitter transmits a laser pulse; the polarity deflection camera obtains light intensity data of every four adjacent pixels; the timer obtains the scattered signal transmission time of each pixel; the data processor calculates a distance value of a target corresponding to each pixel, the total light intensity of each adjacent four pixel, the degree of polarization and data of the angles of polarization; according to the data processor, the data is obtained, and an image is drawn in real time. According to the polarity deflection flash laser lidar system and the imaging method, the precision and efficiency of image drawing are drastically improved, and the polarity deflection flash laser lidar system is also applicable to an environment with the low light intensity and the low light contrast ratio.

Description

technical field [0001] The invention relates to a polarized flash laser lidar system and an imaging method. Background technique [0002] Due to the limitations of its own grating projector structure and the measurement principle that relies on timing coding, white light photography equipment not only has a large volume and weight, but also needs a stable support structure such as a tripod to assist in shooting. The convenience is limited, and the brightness of the white light source is limited. Optical properties such as light and the color and material of the object itself are greatly affected. It is difficult to take effective photos in a brighter environment or facing darker-colored objects. Existing cameras can only draw two-dimensional graphics according to light intensity, and cannot provide information on the three-dimensional structure and orientation of the target, and traditional cameras cannot work in low-light-intensity environments or for low-light-intensity ta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/02
CPCG01C11/02
Inventor 占涵宇蒋含莞张劲泉
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT