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Image distortion correction method

A correction method and image distortion technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems affecting the distortion correction speed and the large amount of interpolation calculation.

Inactive Publication Date: 2013-08-28
SOUTHEAST UNIV
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Problems solved by technology

At present, image distortion correction mostly adopts the forward calculation method from the original image to the corrected image. This method is simple in the early stage, but the amount of interpolation calculation on the corrected image in the later stage is large, which affects the speed of distortion correction.

Method used

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Embodiment Construction

[0047] The technical solutions of the present invention will be described in detail below in conjunction with embodiments.

[0048] An image distortion correction method of the present invention includes the following steps:

[0049] Step 10) Obtain the original image data, including steps 101) to 103).

[0050] Step 101) Obtain the distortion coefficient k of the original image 1 , Read the image width and height of the original image;

[0051] Step 102) Establish an original image coordinate system o-xy with the center of the original image as the origin, the x-axis as the abscissa, and the y-axis as the y-axis; the row i and column j of each pixel in the original image are in the same The coordinate relationship in the original image coordinate system satisfies formula (1):

[0052] x = j + 0.5 - width 2 y = height 2 - i - 0.5 Formula 1)

[0053] Among them, x represents the abscissa of the pixel in the original image coordinate s...

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Abstract

The invention discloses an image distortion correction method, comprising the following steps of: (10) obtaining the data of an original image; (20) establishing an corrected image; (40) measuring the red value, green value and blue value of a pixel on the corrected image; and (50) establishing an corrected image: returning to step (30) until the red value, the green value and the blue value of each pixel on the corrected image are measured, thereby establishing the corrected image. Under the condition that the image distortion coefficient is known, each pixel on the distortion corrected image is inversely measured to obtain the position of the pixel in the original image, and then the red, green and blue color values of the pixel are measured by bilinear interpolation. The correction process is simple and efficient.

Description

Technical field [0001] The invention belongs to the fields of computer vision and digital photogrammetry, and specifically relates to a method for correcting image distortion. Background technique [0002] Computer vision and digital photogrammetry fields often require spatial three-dimensional measurement of photographic targets through images. Among them, image distortion has a great influence on the measurement results. It is required to correct the coordinates of image points by obtaining image distortion coefficients during the measurement process. . At present, the image distortion correction mostly adopts the forward calculation method from the original image to the corrected image. This method is simple to calculate in the early stage, but the amount of interpolation calculation on the corrected image in the later stage is large, which affects the speed of distortion correction. Summary of the invention [0003] Technical problem: The technical problem to be solved by the...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 沙月进翁永玲陆中祥张小琴
Owner SOUTHEAST UNIV
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