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Absolute displacement measuring device and method based on digital picture

A digital image and absolute displacement technology, applied in measuring devices, optical devices, instruments, etc., can solve problems such as undiscovered reports or literature, and achieve the effect of overcoming error accumulation, simplifying complex procedures, and high measurement accuracy

Inactive Publication Date: 2010-12-22
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The project team has recently searched domestic and foreign patent documents and published journal papers through the Internet and existing materials in the library, and has not found any reports or documents that are closely related to the present invention and the same

Method used

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  • Absolute displacement measuring device and method based on digital picture
  • Absolute displacement measuring device and method based on digital picture
  • Absolute displacement measuring device and method based on digital picture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: as figure 2 As shown, the present invention is an absolute displacement measuring device based on a digital image, and the measuring device includes: a test plane 1, a marker point 2, an imaging device 4, an image acquisition card, and a computer. The imaging system composed of three marker points 2 with known absolute coordinates, camera equipment 4 and imaging plane 5 is arranged on the test plane 1. The camera equipment 4 is arranged at a position perpendicular to the test plane 1. The camera equipment 4 communicates with the computer through a signal line. The image acquisition card in the system is connected, and the image acquisition card is installed in the bus slot of the computer. The imaging device 4 employs a video camera.

[0036] The installation of camera equipment 4 adopts the following steps to carry out: camera equipment 4 is arranged on the position perpendicular to test plane 1, adjusts the height of camera equipment 4 according to the...

Embodiment 2

[0039] Example 2: see figure 1, the overall composition of the device is the same as that of Embodiment 1. Four marker points 2 with known absolute coordinates are arranged on the test plane 1. The marker points 2 use artificial markers. The artificial markers can be various types of two-dimensional coded markers used in photogrammetry, such as Dot distribution coding signs, circular coding signs, etc. Artificial marks can be made on the test plane 1 by pasting or etching. The size and contrast of artificial signs shall ensure that their codes and positions can be correctly identified on the resulting digital images. The spacing of artificial signs shall ensure that there are 2 complete images of signs within the field of view of the imaging system. The number of artificial markers and the encoding capacity are determined by the measurement range and the field of view of the imaging system.

Embodiment 3

[0040] Embodiment 3: see figure 1 , the overall composition of the device is the same as that of Embodiment 1, and five marker points 2 with known absolute coordinates are arranged on the test plane 1, and the marker points 2 adopt natural marks, which refer to direct use of natural patterns or textures on the original materials of the test plane 1 A method that acts as an encoding flag. Natural signs serving as landmarks should be distinguishable to a certain extent. The size, contrast, spacing, and quantity requirements of natural signs are the same as those of artificial signs.

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Abstract

The invention discloses an absolute displacement measurement device based on digital images and a method thereof, belonging to the technical field of visual measurement. Absolute coordinate marked points are arranged on a testing plane in a distribution way, camera equipment is placed at a position vertical to the testing plane, a nonlinear model for establishing an imaging system is calibrated in advance, and an image to be tested is taken and sent to a computer for processing by an image acquisition card; the computer preprocesses the input image, identifies coding and sub-pixel positions of image points corresponding to any two marked points in the image, and calculates the absolute displacement of the object to be tested in the testing plane according to the nonlinear model of the imaging system and the absolute coordinate of the two marked points so as to achieve various displacement measurement of the absolute coordinate of the object to be tested. The invention solves technicalproblems of complex system, big accumulative error and the like, has simple system and links, simple and clear device and method, easy execution, less links, small accumulative error, high measurement accuracy, wide measuring range and low cost of measuring equipment, and can obtain measuring results in one time.

Description

technical field [0001] The invention belongs to the field of image processing and visual measurement, and mainly relates to a method for measuring absolute displacement in a plane by using a digital image processing method. The invention also relates to a device for measuring with this method. Specifically, it is a digital image-based absolute displacement measuring device and an absolute displacement measuring method. Background technique [0002] The measurement of plane displacement is widely used in industrial production and scientific research, such as the precise positioning of various instrument tables. For the measurement of plane displacement, the current commonly used method is to place two linear displacement sensors and one angular displacement sensor on the three measured components respectively. The disadvantage is that three displacement sensors are required, which increases the measurement cost and the size of the instrument. When the measurement space is li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
Inventor 张君安赫东锋刘波王建华方舟董三峰刘佳
Owner XIAN TECH UNIV
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