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Aerial image geometric correction method without control points

An aerial image and geometric correction technology, which is applied in image enhancement, image analysis, image data processing, etc., to achieve the effect of improving the matching score and the matching accuracy rate

Active Publication Date: 2018-06-01
DALIAN UNIV OF TECH
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Problems solved by technology

However, this method uses a forward correction scheme that calculates and corrects image coordinates from aerial image coordinates, and there may be an offset of 0.5 pixels in pixel coordinate correspondence

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  • Aerial image geometric correction method without control points
  • Aerial image geometric correction method without control points

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[0029] The specific implementation manner of the invention will be further described below in conjunction with the technical scheme and accompanying drawings.

[0030] An aerial image is available, see figure 2 (a), image width W in =1200 pixels, image height H in = 1200 pixels. Known pitch angle α=-5.49104 degrees, roll angle β=23.65296 degrees, yaw angle γ=152.12839 degrees, and flying height H=245 meters. Image center (C u ,C v )=(1288.00,1029.00), unit: pixel; physical length of unit pixel (d x ,d y )=(0.00345,0.00345), unit: mm / pixel; focal length (f x , f y )=(4.968,4.968), unit: mm. After correction, the cubic spline interpolation method is used to calculate the specific pixel value. The image correction process is as follows:

[0031] Step 1, using formula (1) to convert the pixel coordinates (u, v) of the corrected image into image physical coordinates (x, y);

[0032] Step 2, use the formula (2) to inversely correct the height of the physical coordinates...

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Abstract

The invention relates to an aerial image geometric correction method without control points, and belongs to the field of digital image processing. According to the method, no-control-point correctionis performed on an aerial image by employing flight attitude information such as the pitch angle, the rolling angle and the yaw angle, and flight height information, a reverse correction scheme of calculating a coordinate of the aerial image through a coordinate of a correction image is provided, original pixel information of an original image is fully used, problems of possible 0.5 pixel deviation and repeated correspondence caused by a forward correction method of calculating the coordinate of the correction image through the coordinate of the aerial image are eliminated, and the quality ofthe correction image is higher; and geometric correction of 126 frames of aerial images is performed by employing a spline interpolation method for three times, feature extraction and matching can beperformed on adjacent frames of images by employing a SIFT method, the number of correct matching feature point pairs is increased by 5.47%, the matching accuracy is increased by 2.58%, and the matching score is increased by 17.95%.

Description

technical field [0001] The invention belongs to the field of digital image processing, in particular to a method for geometrically correcting aerial images without control points. Background technique [0002] In recent years, with the continuous maturity of UAV technology, and the advantages of UAVs such as flexible maneuverability and high image resolution, UAVs have been widely used in aerial photography. However, UAVs are easily affected by factors such as airflow fluctuations and fuselage vibrations during flight, resulting in changes in flight attitude information, including pitch angle, roll angle, yaw angle, and flight height information. There is a certain geometric distortion in the real object, that is, the pixel of the real object has translation, scaling, rotation, stretching, etc. in the image. In order to eliminate the geometric distortion in the aerial image, it is necessary to perform geometric correction on the image. [0003] At present, the geometric co...

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Application Information

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IPC IPC(8): G06T5/00G06T3/40
CPCG06T3/4007G06T2207/10032G06T5/80
Inventor 林秋华刘志旋
Owner DALIAN UNIV OF TECH
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