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A fast automatic focusing method for push-broom hyperspectral camera

An automatic focusing and hyperspectral technology, which is applied in the field of hyperspectral camera focusing, can solve the problems that the focusing algorithm cannot be applied to push-broom remote sensing cameras, etc., and achieve the effect of fast focusing speed, small calculation amount and strong robustness

Active Publication Date: 2020-09-11
NANJING UNIV OF SCI & TECH +1
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AI Technical Summary

Problems solved by technology

Since the push-broom hyperspectral camera only scans one row of images at a time, the traditional focusing algorithm cannot be applied to the push-broom remote sensing camera

Method used

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  • A fast automatic focusing method for push-broom hyperspectral camera
  • A fast automatic focusing method for push-broom hyperspectral camera
  • A fast automatic focusing method for push-broom hyperspectral camera

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Embodiment

[0059] combine figure 1 , the push-broom hyperspectral camera fast automatic focusing method of the present invention, the steps are as follows:

[0060] The first step is to initialize the lens position: rotate the lens to the initial position through the automatic focusing mechanism.

[0061] The second step is to change the defocus state to obtain spectral data: rotate the lens clockwise, each time the lens extends 0.15mm, and obtain the spectral data under the current defocus state. If it exceeds the focus range, go to step five.

[0062] The third step is to construct the spectral data matrix: this step uses Xenices XEVA series short-wave infrared remote sensing cameras with a resolution of 320×256 and a spectral response range of 800-2500nm. Focus on the target scene with the black and white stripe pattern. Firstly, obtain the single-line spectral data X(d i ), where d i Indicates the telescopic amount of the lens in the i-th focusing state. Arrange the original sp...

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Abstract

The invention discloses a fast automatic focusing method of a push-broom hyperspectral camera. The method comprises the following steps: initializing the lens position; changing the defocus state to obtain spectral data; constructing a spectral data matrix; calculating and storing spectral quality index values; Combine the Gaussian distribution function between the spectral quality index value and the lens expansion and contraction; estimate the best focusing position. The present invention only utilizes a single line of spectral data for spectral quality evaluation, with small amount of calculation and fast focusing speed; adopts quaternion wavelet transform to extract multi-scale information of spectral data to construct focusing function, which has high accuracy and strong robustness; uses Gaussian function to approximate Combined with the spectral evaluation value, it can realize the automatic focusing of the push-broom camera.

Description

technical field [0001] The invention relates to hyperspectral camera focusing technology, in particular to a fast automatic focusing method for a push-broom hyperspectral camera. Background technique [0002] With the development of science and technology, spectral imaging technology plays an increasingly important role in the military and civilian fields. The wide application of spectral technology has put forward higher and higher requirements for camera imaging quality, and focusing technology is one of the prerequisites and key technologies for obtaining high-quality remote sensing images. [0003] At present, hyperspectral camera focusing methods are mainly divided into photoelectric self-collimation methods and image processing-based methods. The photoelectric self-collimation method is based on the principle of optical self-collimation imaging, and the focus is accurately checked and adjusted by measuring and comparing the light intensity at different positions near ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N17/00
CPCH04N17/002H04N23/67
Inventor 肖亮魏桂华郑志忠
Owner NANJING UNIV OF SCI & TECH
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