Quick and automatic focusing method of push-broom hyperspectral camera

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

Active Publication Date: 2018-08-14
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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  • Quick and automatic focusing method of push-broom hyperspectral camera
  • Quick and automatic focusing method of push-broom hyperspectral camera
  • Quick and automatic focusing method of 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 quick and automatic focusing method of a push-broom hyperspectral camera. The method comprises the following steps of initializing a lens position; changing a defocus state to acquire hyperspectral data; building a hyperspectral data matrix; computing and storing a hyperspectral quality index value; fitting a Gaussian distribution function between the hyperspectral quality index value and lens expansion and contraction quantity; and estimating the best focusing position. According to the method provided by the invention, only the single column of hyperspectral data isused for performing hyperspectral quality assessment, the computing quantity is small, and the focusing speed is high; quaternion wavelet transform is used for extracting the hyperspectral data multiscale information to build a focusing function, the accuracy is high and the robustness is strong; and the Gaussian function is used for fitting a hyperspectral assessment value, an the automatic focusing of the push-broom camera can be achieved.

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 Applications(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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