TOF imaging system capable of automatically adjusting exposure time and automatic exposure method thereof

A technology of exposure time and imaging system, applied in parts of TV system, image communication, color TV parts, etc., can solve the problem of not being able to use the dynamic shooting environment, etc., and achieve the effect of less parameters involved and simple steps

Pending Publication Date: 2021-07-30
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the above-mentioned prior art cannot be used in a dynamic shooting environment, the present invention provides a TOF imaging system that can automatically adjust the exposure time and its automatic exposure method. In a dynamic shooting environment, the TOF imaging system can be simple and fast and stable adjustment of the exposure time

Method used

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  • TOF imaging system capable of automatically adjusting exposure time and automatic exposure method thereof
  • TOF imaging system capable of automatically adjusting exposure time and automatic exposure method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 Shown is an embodiment of a TOF imaging system that can automatically adjust the exposure time, including a data acquisition module, a Zynq development platform control module connected to the data acquisition module, and a host computer module connected to the Zynq development platform control module in communication; data acquisition The module includes a TOF sensor for data acquisition; the Zynq development platform control module includes a programmable logic unit and a processor unit, and the programmable logic unit is used to obtain the data of the TOF sensor and transmit the data to the processor unit for cache; the processor unit It is used to communicate with the host computer module, configure the TOF sensor and adjust the exposure time.

[0028] Specifically, the processor unit is provided with a Gigabit network port for communicating with the upper computer module, and communicates with the upper computer module through the Gigabit network t...

Embodiment 2

[0034] Such as figure 2 Shown is an embodiment of an automatic exposure method for a TOF imaging system, which may be based on the TOF imaging system of Embodiment 1, including the following steps:

[0035] Step 1: Set the initial parameter value: set a corresponding range threshold according to the actual application scenario, and set a threshold D T and step size μ, set the initial exposure time t 0 ; Calculate the average amplitude A of the first frame 0av with optimal amplitude A op The deviation between D 0 ,D 0 =A 0av -A op ; if D 0 The absolute value of is less than the threshold D T , the exposure time of the first frame is the appropriate exposure time, at this time t 0 is the appropriate exposure time, if D 0 The absolute value is greater than D T , proceed to the next step;

[0036] Step 2: Calculate the average amplitude A of the current frame within the range threshold nav with optimal amplitude A op The deviation between D n ,D n =A nav -A op ;...

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Abstract

The invention relates to a TOF imaging system capable of automatically adjusting exposure time and an automatic exposure method thereof. The system comprises a data acquisition module, a Zynq development platform control module and an upper computer module, wherein the data acquisition module comprises a TOF sensor for data acquisition; the Zynq development platform control module comprises a programmable logic unit and a processor unit; the programmable logic unit is used for acquiring data of the TOF sensor and transmitting the data to the processor unit for caching; and the processor unit is used for communicating with the upper computer module, configuring the TOF sensor and adjusting the exposure time, and enabling the TOF sensor to adjust the automatic exposure time in time in a dynamic environment by setting an automatic exposure algorithm. The automatic exposure method comprises three simple steps with less related parameters, the method can be simple, rapid and stable and can be suitable for automatic adjustment of exposure time in a dynamic environment, and a system using the exposure method can operate more stably.

Description

technical field [0001] The invention relates to the field of time-of-flight (TOF) sensors, and more particularly, to a TOF imaging system capable of automatically adjusting exposure time and an automatic exposure method thereof. Background technique [0002] Time-of-Flight (TOF) technology means that the sensor emits modulated near-infrared light and reflects it when it encounters an object. The sensor calculates the distance between the light and the reflection time or phase difference, and then converts the distance of the object to generate depth information. , that is, the distance information between the object and the camera, which also provides detailed spatial position relationship. TOF technology is widely used in the fields of drone flight obstacle avoidance, human-computer interaction and gesture recognition, machine positioning and intelligent navigation, human detection and object detection, industrial automation and unmanned driving. As the resolution of the T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N5/235H04N5/355
CPCH04N23/50H04N23/741H04N25/57
Inventor 刘立林贺文
Owner SUN YAT SEN UNIV
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