A fast method for generating panoramas from fisheye images
A fisheye image and panorama technology, applied in the field of geometric correction, can solve problems such as unsatisfactory correction effect, inability to correct images, image distortion, etc. Effect
Active Publication Date: 2017-02-22
HUAQIAO UNIVERSITY
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Problems solved by technology
However, the fisheye lens inevitably causes distortion of the captured image while obtaining a wide range of viewing angles.
According to the orientation of the optical axis of the fisheye lens, the existing fisheye image correction methods can be mainly divided into two scenarios: shooting with the optical axis of the lens facing forward and facing up (downward). There are many methods of correction, but these methods generally cannot correct the image taken with the lens facing up (down)
Moreover, for images captured when the optical axis of the lens is facing up (down), there are not many current correction methods, and the correction effect of the existing methods is generally not very ideal.
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[0028] The present invention will be further described below through specific embodiments.
[0029] A fast method for generating panoramas from fisheye images. The fisheye image obtained when the optical axis of the fisheye lens is facing up or down is used as the corrected image. Refer to figure 1 , including the step of setting parameters: using the corrected image (such as Figure 4 ) information, obtain the center point of the corrected image as the polar coordinate transformation center (r0, c0); set the small circle radius r1 (can be set to 10 pixels) from the center of the corrected image as the expanded ring image Radius of the small circle (the circular image is a circular area of the corrected expanded image); the smaller value in the width and height of the corrected image is set as the large circle radius r2 of the expanded circular image; the upper pole of the corrected image is set Polar angle step of the coordinates Δθ=2*π / w, polar radius step Δρ=(r2-r1) / h, w...
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The invention provides a method for fast generating a panorama by a fish eye image. According to the method, the fish eye image obtained when an optical axis of a fish eye lens faces the upward direction or the downward direction is used as a corrected image; firstly, the center of the fish eye image is used as a polar coordinate center O; the polar coordinate conversion is utilized for mapping points on a corrected and unfolded image plane onto corresponding polar coordinate pixel points in the corrected fish eye image; then, polar coordinates are converted into Cartesian coordinates of the corrected and unfolded image; a pixel value of the Cartesian coordinates is calculated by utilizing a fast bicubic interpolation technology, and the pixel value is the pixel value of the pixel points on the corrected and unfolded image plane; and a complete unfolded image can be obtained through a series of coordinate conversion and interpolation.
Description
technical field [0001] The invention relates to the field of geometric correction in the field of digital image processing, in particular to a fisheye image correction technology based on polar coordinate transformation and fast bicubic interpolation, especially capable of correcting images taken with the optical axis of the lens facing up and down. Background technique [0002] At present, fisheye lenses are widely used in many fields such as large-scale video surveillance, intelligent transportation systems, automotive electronics, and robot navigation due to the convenience of obtaining ultra-large wide-angle images. However, the fisheye lens inevitably causes distortion of the captured image while obtaining a wide range of viewing angles. According to the orientation of the optical axis of the fisheye lens, the existing fisheye image correction methods can be mainly divided into two scenarios: shooting with the optical axis of the lens facing forward and facing up (downw...
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IPC IPC(8): G06T5/50
Inventor 戴声奎高剑萍陈汉苑
Owner HUAQIAO UNIVERSITY