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A resolution board for quality evaluation of aerial photogrammetry and its application method

A resolution board and quality evaluation technology, applied in the field of resolution boards, can solve problems such as large space, distortion correction, and lack of camera lenses, etc., to achieve the effect of expanding the resolution range and improving quality

Active Publication Date: 2021-04-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the USAF1951 resolution test board is all long strip patterns, and the short side is used as the basis for resolution calculation, but the long side takes up a lot of space, which is not suitable for large-scale measurement of UAV aerial photography. Applicable, and cannot effectively correct for camera lens distortion

Method used

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  • A resolution board for quality evaluation of aerial photogrammetry and its application method
  • A resolution board for quality evaluation of aerial photogrammetry and its application method
  • A resolution board for quality evaluation of aerial photogrammetry and its application method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A resolution board for quality assessment of aerial photogrammetry, see figure 1 , figure 2 with image 3 , the resolution board includes:

[0036] The resolution board is made of PVC material or PVC polyester grid as the substrate, and the resolution test pattern 1 and the field of view marking box 2 are made by printing or inkjet technology on the substrate of the resolution.

[0037] Among them, the field of view marking box 2 is a square box, and the width of the box is 2.5% of the length of the inner side, for example: the inner side of the box is 4m long, and the outer side is 4.1m long, which is used to mark the size of the field of view of the resolution board (The following descriptions all take this size as an example).

[0038] Resolution test pattern 1 is a horizontal and vertical resolution test pattern mixed. The resolution test pattern 1 is diagonally symmetrical, mainly composed of n kinds of square patterns, and the side lengths are 1 / 2, 1 / 4, 1 / 8, ...

Embodiment 2

[0042] A method for using a resolution board for quality evaluation of aerial photogrammetry, see figure 2 , image 3 with Figure 4 , the usage method includes the following steps:

[0043] 101: Make a resolution board, and select a suitable flat and open area in the area to be tested, and use iron pestles and heavy pressure blocks to spread and fix the resolution board;

[0044] 102: Turn on the UAV, fly to the predetermined shooting height, perform the task of shooting the ground, and obtain the two-dimensional image of the ground at the same time;

[0045] 103: Find the resolution plate in the two-dimensional image, use the image processing algorithm to find out the position of the characteristic corner point 3 in the resolution plate, and at the same time perform analytical calculation to obtain the distortion coefficient of the camera;

[0046] Among them, the characteristic corner point 3 refers to the place where the black and white blocks meet (see figure 2), us...

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Abstract

A resolution board for quality evaluation of aerial photogrammetry and its use method, using printing or inkjet technology to make a resolution test pattern and a field of view marking box on the substrate; the field of view marking box is used to mark the field of view of the resolution board ; The resolution test pattern is a pattern mixed horizontally and vertically, which is symmetrical along the diagonal, and is composed of n kinds of square patterns; the horizontal and vertical resolutions of the aerial orthophoto map are obtained by analyzing the resolution test pattern. The short line size corresponding to the smallest group of patterns represents the resolution of the image. The invention uses the self-designed resolution board as a test tool, and calculates the resolution of the image by analyzing the resolution board pattern in the finally synthesized three-dimensional model. Camera distortion correction to improve image quality. The resolution plate and its application method have the advantage of being able to simultaneously invert imaging resolution and camera correction.

Description

technical field [0001] The invention relates to the field of three-dimensional digital terrain reconstruction, in particular to a resolution board and a method of using the resolution board for collecting ground images by using an unmanned aerial vehicle and evaluating the construction quality of a three-dimensional terrain model. Background technique [0002] Image-based 3D reconstruction is a method to restore 3D models of objects and scenes from several 2D images. This method involves many disciplines such as computer image processing, computer graphics, computer vision and pattern recognition. Compared with the traditional method of using modeling software or 3D scanner to obtain a three-dimensional model, the method based on image 3D reconstruction has low cost, strong sense of reality, and high degree of automation, so it has broad application prospects. At present, this technology has become a research hotspot in 3D reconstruction. [0003] In recent years, with the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 薛彬张凯王志洋陈阳张好运
Owner TIANJIN UNIV
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