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CN-122023434-A - Field segmentation and recombination method based on telecentric imaging system

CN122023434ACN 122023434 ACN122023434 ACN 122023434ACN-122023434-A

Abstract

A field-of-view segmentation recombination method based on a telecentric imaging system belongs to the field of image spectrum detection, and can simultaneously image sub-regions of a segmented target to be detected, so that the method can be used for measuring a static target to be detected, measuring a dynamic target, such as a capillary, a circular tube laminar flow, a single-particle flight trajectory, a combustion experiment and the like, is also applicable to targets to be detected with an excessively large or excessively small aspect ratio, and has a wide application range. The utilization rate of camera pixels is improved through segmentation and recombination of the longitudinal and transverse targets to be detected, and the purpose of reducing experiment cost is achieved.

Inventors

  • GUO HAN
  • LI KUANGYU
  • ZHOU HUAICHUN
  • LIU FENGSHAN

Assignees

  • 中国矿业大学

Dates

Publication Date
20260512
Application Date
20260206

Claims (9)

  1. 1. A field segmentation and recombination method based on a telecentric imaging system is characterized by comprising the following steps: step1, determining a sub-view field segmentation scheme according to an imaging system and target parameters to be detected; First, determining the field of view range of an imaging system consisting of a camera and a telecentric imaging lens And the actual size of the object to be measured The radius of the telecentric imaging lens is According to the field of view range of the imaging system and the range of the target to be detected, a sub-field of view segmentation scheme is preliminarily determined according to the requirement of the target to be detected on longitudinal segmentation or transverse segmentation; Step2, designing the size and the position of a reflecting prism in each imaging path of the sub-view field according to the sub-view field segmentation scheme; the reflecting mirror group adopts triangular prisms with the same material, and the inclined plane is a uniform mirror surface; the image of the target to be measured is divided longitudinally or transversely and then becomes a plurality of sub-areas, the sub-area image is received by the imaging system after being refracted by the triangular prism, the sub-area of the target to be measured is changed from longitudinal distribution to transverse distribution or from transverse distribution to longitudinal distribution, and the division recombination is realized.
  2. 2. The method of claim 1, wherein in step 1, for a longitudinally split field-of-view segmentation scheme, when And is also provided with At the time, the object to be measured is carried out The sub-longitudinal division is performed in such a way that, at this time, the sub-view field corresponds to the object to be measured the actual coverage of the target is: 。
  3. 3. The method of claim 1, wherein in step 1, for a transversely segmented field segmentation scheme, when And (2) and At the time, the object to be measured is carried out The sub-lateral division is performed such that, at this time, the sub-view field corresponds to the object to be measured the actual coverage of the target is: 。
  4. 4. the method of field segmentation and reconstruction based on a telecentric imaging system as set forth in claim 1, wherein in step 2, the refractive surface of the triangular prism is the same as the size of the segmented sub-field, and the reflective surface of the triangular prism is longitudinally segmented to be the same as the size of the sub-field The size of the reflecting surface of the transverse split triangular prism is as follows 。
  5. 5. The method for reconstructing field of view segmentation based on a telecentric imaging system according to claim 4, wherein: in step 2, for The sub-division scheme uses 2 groups of triangular prisms, each denoted by A, B, wherein group A is composed of Identical triangular prisms 、 、 ...... Group B is composed of Identical triangular prisms 、 、 ...... The two end faces of the A group triple prism are short side length Is isosceles right triangle, and the thickness of the triangular prism is Two end faces of the B group triple prism are short side length Is isosceles right triangle, and the thickness of the triangular prism is ; 。
  6. 6. The method for reconstructing field of view segmentation based on a telecentric imaging system according to claim 5, wherein: in step 2, for The sub-longitudinal segmentation scheme, the object to be measured is divided into ①、②、③. A sub-region formed of A light path; 、 、 ...... are all incident with the object to be measured the light rays form an included angle of 45 degrees; 、 、 ...... Respectively receive 、 、 ...... Light refracted at the mirror; Is connected with The light that is refracted is directed to the light source, Is connected with The light that is refracted is directed to the light source, Is connected with Refracted light; 、 、 、 ...... The refracted light is respectively received by the camera, and the images of the object ① subareas to be measured are successively passed through 、 、 、 The refraction of the triangular prism is received by the imaging system ① area, and the rest of the objects to be measured The areas pass by 、 Refractive imaged system of prism Area reception, object to be measured ①、②、③. The subareas change from longitudinal distribution to transverse distribution.
  7. 7. The method for field segmentation and reconstruction as set forth in claim 6, wherein for a telecentric imaging system Sub-transverse segmentation based on longitudinal direction And the sub-divided prism combination device is used for exchanging the positions of the target to be detected and the target surface of the camera.
  8. 8. The method of claim 7, wherein in step 2, for the size range of the group A prism in step 2, 、 、...... Is less than or equal to the range of the imaging system field of view And similarly, receiving a prism 、 、...... Refracting light 、 、 ...... 、 The sum of the spatial ranges of the triangular prisms is also small is equal to or greater than the field of view of the imaging system I.e. not exceeding the field of view of the imaging system, to obtain a complete image of the object to be measured.
  9. 9. The method for field segmentation and reconstruction based on a telecentric imaging system according to claim 8, wherein in step 2, And (3) with Distance between Is larger than the radius of telecentric imaging lens So as not to obstruct the propagation of the light of the object to be measured.

Description

Field segmentation and recombination method based on telecentric imaging system Technical Field The invention belongs to the field of image spectrum detection, and particularly relates to a field segmentation and recombination method based on a telecentric imaging system, which is suitable for the situation that the imaging efficiency of a camera does not meet the actual requirements. Background The image spectrum measurement technology realizes the accurate qualitative and quantitative analysis of the target and the visualization of the spatial distribution thereof by synchronously acquiring the spatial image information and the spectral feature information of the target, becomes a key technical means in a plurality of fields such as agricultural remote sensing, environmental monitoring, biological medicine, industrial detection and the like, provides important data support for refined research and scientific decision, and has increasingly prominent application value and technical importance. In an imaging link, a conventional lens introduces perspective errors of 'near-large and far-small' based on a perspective imaging principle, so that geometric distortion is generated in object space imaging, and the object space dimension is difficult to truly restore. The telecentric imaging technology effectively eliminates perspective errors through special optical design, so that an object space is imaged on an image plane with fixed magnification, and the imaging size only depends on the actual size of the object space, thereby realizing accurate imaging with consistent dimensions. However, in practical application, when telecentric imaging is adopted to image a target to be detected with a larger or smaller aspect ratio, on the premise that the resolution of a camera is set, the pixel ratio of the target on the imaging target surface is limited, so that the resolution of the target to be detected is reduced, a large number of pixel areas in the imaging field of view are idle, and serious waste of pixel resources is formed. If the resolution of the object is improved simply by replacing the camera with higher resolution, high equipment cost is required, and the overall cost performance is low. Therefore, aiming at the problems of low utilization rate of pixel resources and high cost of a high-resolution camera in large-view-field target measurement in a telecentric imaging mode, research on a view-field segmentation and recombination method is needed, and on the premise of not increasing equipment cost, the pixel resources of the existing camera are fully utilized, so that the resolution of image spectrum measurement and the overall cost performance of a system are improved. Disclosure of Invention The invention aims to solve the technical problems that when a large-view-field target is measured in a telecentric imaging mode, the pixel resource utilization rate of the existing camera is low, so that the resolution of an object is insufficient, and if the resolution is improved by replacing a high-resolution camera, the cost is too high and the cost performance of a system is low. In order to solve the technical problems, the invention adopts the following technical scheme: A field segmentation and recombination method based on a telecentric imaging system comprises the following steps: step1, determining a sub-view field segmentation scheme according to an imaging system and target parameters to be detected; First, determining the field of view range of an imaging system consisting of a camera and a telecentric imaging lens And the actual size of the object to be measuredThe radius of the telecentric imaging lens isAccording to the field of view range of the imaging system and the range of the target to be detected, a sub-field of view segmentation scheme is preliminarily determined according to the requirement of the target to be detected on longitudinal segmentation or transverse segmentation; Step2, designing the size and the position of a reflecting prism in each imaging path of the sub-view field according to the sub-view field segmentation scheme; the reflecting mirror group adopts triangular prisms with the same material, and the inclined plane is a uniform mirror surface; the image of the target to be measured is divided longitudinally or transversely and then becomes a plurality of sub-areas, the sub-area image is received by the imaging system after being refracted by the triangular prism, the sub-area of the target to be measured is changed from longitudinal distribution to transverse distribution or from transverse distribution to longitudinal distribution, and the division recombination is realized. The field segmentation and recombination method has the advantages that: (1) The method can be used for measuring static targets and dynamic targets, such as ascending capillaries, circular tube laminar flow, single-particle flight trajectories, combustion experiments and the like. (2) The method is also