Digital distorting model generating method for compensating image distortion of camera measurement

A technology of distortion model and photogrammetry, applied in photogrammetry/video metrology, photography, measuring devices, etc., can solve problems such as lack of objective standards for evaluation results, lack of camera versatility, and lack of distortion compensation capabilities

Inactive Publication Date: 2005-07-27
WUHAN UNIV
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Problems solved by technology

[0009] When using the function model, the subsequent data processing of photogrammetry and remote sensing must face dozens of function models proposed by Westerners (sometimes even contradictory), and make a choice, which is time-consuming and labor-intensive.
In addition, using the traditional function model, the imaging mechanism of the imaging system must be understood, and the possible error sources and their impact levels must be analyzed one by one and in detail
All in all, the method based on the "function model" does not

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  • Digital distorting model generating method for compensating image distortion of camera measurement
  • Digital distorting model generating method for compensating image distortion of camera measurement
  • Digital distorting model generating method for compensating image distortion of camera measurement

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Embodiment Construction

[0044] The digital distortion model DDM (Digital Distortion Model) of the present invention is a three-dimensional geometric model with 'fluctuations'. Its 'plane coordinate' is the serial number of the digital image line array and array, and its 'elevation' is the overall distortion of the corresponding pixel. A digital distortion model is established for the image taken by the fisheye digital camera, such as figure 1 shown.

[0045] Essentially, a digital distortion model is a collection of total distortions for each pixel in an image.

[0046] Establish digital distortion models for almost all imaging systems, the purpose is to obtain images without any distortion, and at the same time determine the corresponding internal orientation elements to achieve subsequent three-dimensional measurement. The digital distortion model is essentially different from the previous function models at home and abroad.

[0047] (1) Establishment of control field

[0048] The generation of t...

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Abstract

A method for generating digital distortion model includes setting up and shooting control field, selecting four corner marks and making their distortion zero, leading projective difference in for realizing true 2-D control field transform, measuring out actual position and calculating out theoretical position of each control mark and confirming total distortion of each control mark, obtaining total distortion for each picture element to generate the model by interpolating based on total distortion of four marks nearest to picture element to be measured.

Description

technical field [0001] The invention belongs to the technical field of photogrammetry and remote sensing, and relates to a digital distortion model for compensating photogrammetry image distortion and a generation method of corresponding parameters (internal orientation elements). Background technique [0002] There are two strategies for compensating image distortion, that is, the conventional function model strategy and the digital distortion model strategy proposed by the present invention. [0003] Today, at home and abroad, the compensation for various camera distortions almost all adopts some kind of polynomial function model. The coefficients of such polynomials either have obvious physical meanings, or have imitative physical meanings, or rely on long-term optimization design to determine the shape of the polynomial and its corresponding coefficients. [0004] Those with obvious physical meaning, such as the optical radial distortion coefficient (k 1 , k 2 …) and ...

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Application Information

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IPC IPC(8): G01B11/00G01C11/00G03B43/00
Inventor 冯文灏陈大为商浩亮侯文广李欣
Owner WUHAN UNIV
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