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Method for calculating stereoscopic angle of stereoscopic microscope

A technology of stereo microscope and calculation method, which is applied in the field of computer vision, can solve problems such as errors in measurement results, achieve the effect of reducing errors and improving the accuracy of stereo measurements

Inactive Publication Date: 2014-11-12
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In existing methods, it is assumed that the measurement of the stereoscopic angle is a fixed value, which will lead to errors in the measurement results

Method used

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  • Method for calculating stereoscopic angle of stereoscopic microscope
  • Method for calculating stereoscopic angle of stereoscopic microscope

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Experimental program
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Embodiment 1

[0045] Embodiment one: in the present embodiment, the magnification of stereomicroscope is 1 time magnification, and this moment, object plane center O 1 The distance from point O is L=51mm, for an object whose object point coordinates are (x, y), we can get Extract 22 feature points on the x-axis (x 0 ,0), (x 1 ,0),…(x 21 , 0), in this example, the point on y=0 is used for the convenience of calculation, that is, the object point on the x-axis. According to different actual needs, you can choose a point with more measurement characteristics. According to these 22 points, the functional relationship between the stereoscopic angle of the feature point on the x-axis and the x-coordinate is fitted as

[0046] α=-4.812×e -6 x 4 +13.094×e -5 x 3 -18.204×e -4 x 2 +0.238x+12.454 (6)

[0047] Among them, α represents the desired stereoscopic angle, and e represents the base of the natural logarithm. As can be seen from the above, the stereoscopic angle at the feature point...

Embodiment 2

[0050] Embodiment two: in the present embodiment, the magnification of stereomicroscope is double magnification, and at this moment, object plane center O 1 The distance from point O is L=24.69mm. For an object with object point coordinates (x, y), we can get Extract 22 feature points on the x-axis (x 0 ,0), (x 1 ,0),…(x 21 , 0), in this example, the point on y=0 is used for the convenience of calculation, that is, the object point on the x-axis. According to different actual needs, you can choose a point with more measurement characteristics. According to these 22 points, the functional relationship between the stereoscopic angle of the feature point on the x-axis and the x-coordinate is fitted as

[0051] α=-15.314×e -6 x 4 +2.276×e -5 x 3 -2.6666×e -4 x 2 -10.892x+12.590 (8)

[0052] Among them, α represents the stereoscopic angle to be obtained, and e represents the base of the natural logarithm. It can be seen from the above that the stereoscopic angle at the...

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Abstract

The invention discloses a method for calculating a stereoscopic angle of a stereoscopic microscope. The method comprises the following steps of: obtaining a light path diagram of the stereoscopic microscope; calculating distance between an object point of incident light on an object plane and a projection point of an exit pupil point of the incident light on an exit pupil plane on the object plane; calculating a horizontal coordinate of an object point which is on an x-axis and has projection distance being equal to the distance between the object point of the incident light on the object plane and the projection point of the exit pupil point of the incident light on the exit pupil plane on the object plane; selecting a plurality of known characteristic points of the incident light on the object plane and corresponding known stereoscopic angles, and fitting a polynomial to obtain a fitting function of the stereoscopic angles according to the known characteristic points and the stereoscopic angles thereof in combination with the value of the obtained horizontal coordinate; and finally solving through the fitting function to obtain the stereoscopic angle of the object point to be calculated. The method for calculating the stereoscopic angle of the stereoscopic microscope has the advantages that the error of the stereoscopic angle is reduced and the stereoscopic measuring accuracy is improved.

Description

technical field [0001] The invention relates to the field of computer vision, in particular to a method for calculating the stereoscopic angle of a stereomicroscope. Background technique [0002] The research of stereo microscope is mainly to realize stereo display and stereo measurement. The method of stereo measurement is to first solve the internal and external parameters through camera calibration, and then obtain the parallax relationship between different images through stereo matching, and complete the stereo measurement work according to the matching results and camera parameters. However, in the measurement process, it is assumed that the stereoscopic angle is a fixed value (generally 12°~15°), and the difference in the stereoscopic angle at different positions on the object surface is not considered. The imaging principle of the parallel light stereomicroscope is as follows: figure 1 It can be seen from the figure that the stereo viewing angles are different at di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/22G01B9/04
Inventor 方兰婷杨鸣朱柯汉穆兴中
Owner NINGBO UNIV
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