Geometric correction method of airborne imaging hyperspectrum of unmanned aerial vehicle
A technology for geometric correction and unmanned aerial vehicle, applied in the field of image processing, can solve the problems of difficult polynomial correction geometric fine correction, low-precision POS position sensor, application limitations, etc., to achieve the effect of improving the accuracy of POS information
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specific Embodiment approach 1
[0020] The UAV airborne imaging hyperspectral geometric correction method in this embodiment combines figure 1 As shown, the method is realized through the following steps:
[0021] Step 1. Obtain the POS data of the UAV’s low-precision POS sensor: pitch angle Φ, roll angle Ω, azimuth Ψ, flying height h, and obtain the UAV’s GPS information at the same time;
[0022] Step 2, correcting the error of the POS data generated by the deviation of the collimation axis;
[0023] Step 3. Preprocessing the POS data and the hyperspectral image according to the ground features;
[0024] Step 4, establish a ground coordinate system, and perform geometric correction of collinear equations according to the corrected POS data;
[0025] Step five, ground reference point calibration.
specific Embodiment approach 2
[0026] The difference from the specific embodiment 1 is that in the UAV airborne imaging hyperspectral geometric correction method of this embodiment, the process of correcting the POS data error caused by the deviation of the collimation axis described in step 2 is as follows:
[0027] Step 21, using the standard calibration field to obtain accurate position information of the standard reference object;
[0028] Step two and two, set the collimation axis deviation as (ex, ey, ez), and the POS data as (Φ, Ω, Ψ), then the orthogonal transformation matrix R formed by the image attitude angle is expressed as:
[0029] R = R B L ( Φ , Ω , Ψ ) R P B ( e x , e y , e...
specific Embodiment approach 3
[0039] The difference from the specific embodiment 1 or 2 is that in the UAV airborne imaging hyperspectral geometric correction method of this embodiment, the process of preprocessing the POS data and the hyperspectral image according to the characteristics of the ground features described in step 3 is, because The accuracy of the POS attitude data is very low, resulting in large distortion of the ground objects. After direct correction, the distortion of the ground objects is difficult to recover, so the following processing is performed on the POS attitude data, see figure 2 :
[0040] Step 31: Carry out Kalman filtering on the POS data, and perform differential correction on the GPS information; then according to the latitude and longitude information
[0041] Calculate the distance between the abscissa and ordinate of the offset of the scan center relative to the initial scan center, and convert the unit into meters;.
[0042] Step 32: Obtain hyperspectral image corner ...
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