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Method and device capable of eliminating glare on surfaces of high-reflection fruits and vegetables

A reflective fruit and vegetable and glare technology, applied in the field of optical detection, can solve the problems of unfavorable algorithm recognition, misjudgment of feature extraction, and affecting the accuracy of algorithm recognition, so as to facilitate the identification of surface features, improve the accuracy of feature recognition, and eliminate the problem of glare Effect

Pending Publication Date: 2022-07-29
ANHUI VISION OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of local overexposure (glare) caused by directional strong reflection on the smooth fruit and vegetable surface in the fruit and vegetable sorting system. The existence of this problem is not conducive to algorithm recognition, and it is easy to cause misjudgment during feature extraction, which affects the accuracy of algorithm recognition For ease of understanding, see figure 1 and figure 2 as shown, figure 1 The problem is that there is local overexposure on the surface of smooth fruits and vegetables, and the method and device of the present invention can eliminate the local bright spots in the figure (such as figure 2 shown), so that the fruits and vegetables are uniformly imaged in the field of view, which facilitates the identification of surface features and improves the accuracy of feature recognition

Method used

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  • Method and device capable of eliminating glare on surfaces of high-reflection fruits and vegetables
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  • Method and device capable of eliminating glare on surfaces of high-reflection fruits and vegetables

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Embodiment 1

[0056] See Image 6 As shown, the background color of the fruit and vegetable transmission device 104 is preferably complementary to the color of the fruit and vegetable to be tested 105. Taking red cherry tomatoes as an example, the background color of the fruit and vegetable transmission device is preferably blue-cyan; the light source 101 used is preferably an LED white light surface light source, and the LED surface light source is composed of It consists of a driving circuit, an LED package chip array and a light guide plate 102. The function of the light guide plate is to make the illumination more uniform, and the LED light emission belongs to spontaneous radiation, which is non-polarized light; the first polarization adjustment module is the first linear polarizer 103, the working wavelength is 400- 760nm, 400-700nm can also be selected, and the transmission extinction ratio of the first linear polarizer is required to be greater than 100, and more preferably, the trans...

Embodiment 2

[0073] In Example 1, it can be seen from Equation (4) that under the premise of considering other losses, the first polarizer causes more than 50% of the light emitted by the LED chip to not participate in lighting, resulting in energy waste, so in Example 2 A method of imaging using line laser + line scan camera scanning is proposed, which is beneficial to improve the energy utilization rate of the light source, such as Figure 7 As shown, compared with the symmetrically placed LED surface light source in Embodiment 1, in Embodiment 2, the light source is replaced by a laser light source (laser beam combining module 201 ), which includes three laser beams, and the wavelength ranges of the three laser beams can be selected to be red, respectively. Light: 615-620nm, green light: 530-540nm, blue light: 460-470nm. Further, all three laser beams are required to be linearly polarized light. The energy ratio is red light: green light: blue light = 6:3:1, and it is further required ...

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Abstract

The invention discloses a method and device capable of eliminating glare on the surfaces of high-reflection fruits and vegetables, and relates to the technical field of fruit and vegetable grading, and the method comprises the following steps: S1, a light source emits light; s2, light beam shaping; s3, polarization adjustment; s4, scattering of an object to be measured; s5, polarizing and filtering scattered light; s6, collecting by a lens detector; and S7, computer image acquisition and processing. The device comprises a fruit and vegetable transmission device, fruits and vegetables to be detected, an illumination light source, a light beam shaping module, a first polarization adjustment module, a second polarization adjustment module, a lens and an image detector. Through the method and the device, local bright spots can be eliminated, fruits and vegetables can be uniformly imaged in a view field, surface features can be conveniently identified, and the feature identification accuracy is improved.

Description

technical field [0001] The invention belongs to the field of optical detection, is applied to the field of fruit and vegetable classification, relates to a visual system for sorting fruits and vegetables with smooth surfaces (strong reflection), and in particular relates to a method and a device for eliminating glare on the surfaces of highly reflective fruits and vegetables. Background technique [0002] The quality of fruits and vegetables is uneven due to congenital and acquired factors. Fruit and vegetable grading is of great significance for improving product utilization, reducing waste, and facilitating processing. The premise of fruit and vegetable grading is the extraction of fruit and vegetable grading features, and feature extraction requires good imaging effects, so machine vision solutions for different types of fruit and vegetable grading are particularly important. [0003] In the prior art, the patent application with the publication number of CN113751355A int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/21
CPCG01N21/21
Inventor 魏芳坤余正保王争
Owner ANHUI VISION OPTOELECTRONICS TECH
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