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Distance measurement error correction method and device for camera module

A camera module, ranging error technology, applied in the field of ranging, can solve problems such as affecting production efficiency and occupying space, increasing calibration time, and time-consuming, so as to improve calibration efficiency and accuracy, avoid multiple movements, and improve accuracy. high effect

Pending Publication Date: 2021-12-03
KUNSHAN Q TECH CO LTD
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Problems solved by technology

Higher precision requires more sampling points, each sampling needs to move the test pattern, so moving the test pattern multiple times will consume more time, will greatly increase the calibration time, and will seriously affect production efficiency and take up space

Method used

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  • Distance measurement error correction method and device for camera module
  • Distance measurement error correction method and device for camera module
  • Distance measurement error correction method and device for camera module

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Embodiment approach

[0045] In some embodiments, the camera module is first placed in any posture; then the test pattern is placed obliquely relative to the camera module, so that the plane where the test pattern is located is inclined relative to the plane where the image sensor chip of the camera module is located, and The projection of the plane where the image sensor chip is located falls into the plane where the test pattern is located.

[0046] refer to figure 2 , image 3 As shown, the plane where the image sensor chip is located is marked as M 1 , the plane where the test board is located is marked as M 2 , the test board is in an inclined posture relative to the camera module, which means: the plane M where the test board is located 2 Relative to the plane M where the image sensor chip is located 1 tilted, and the plane M where the image sensor chip is located 1 The orthographic projection of falls into the plane M where the test board is located 2 .

[0047] Preferably, refer to ...

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Abstract

The invention discloses a distance measurement error correction method and device for a camera module, the camera module comprises an image sensing chip, a test drawing board is obliquely placed relative to the camera module, and the angle information of the test drawing board in an inclined posture relative to the camera module is acquired; a distance error of a plurality of target pixels on the image sensing chip is determined according to the angle information; and an error correction compensation curve is determined based on the distance error of the plurality of target pixels. According to the invention, the calibration efficiency of the camera module is improved.

Description

technical field [0001] The invention belongs to the technical field of ranging, and in particular relates to a ranging error correction method and device for a camera module. Background technique [0002] dTOF (direct Time of Flight) is a technology to calculate the distance from the object by directly calculating the time when the modulated infrared laser pulse of a specific wavelength is reflected from the surface of the measured object; its principle is to count the exposure of the camera module once The return time of several infrared pulses received within a certain period of time, and then the actual pulse flight time is output through the statistics of the chip, and then the actual pulse flight distance is obtained according to the speed of light. [0003] However, due to the Pile-Up (pulse accumulation effect), the reflected pulse is too strong, which will cause an error in the calculation of the pulse flight time. The closer the distance to the reflecting surface, t...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4021
Inventor 庞文浩王旭燕宇罗建文
Owner KUNSHAN Q TECH CO LTD
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