A multi-modal optical illumination based transparent beverage bottle impurity detection enhancement device

Abstract

The utility model discloses a kind of transparent beverage bottle impurity detection enhancement device based on multimode optical illumination, including industrial camera, structured light backlight unit, low-angle side light unit and polarized light illumination unit;Industrial camera is photographed from top to bottom along bottle body bottle mouth;Structured light backlight unit is set to the opposite side of beverage bottle, for providing the structured light background with directionality and strong contrast;Low-angle side light unit is arranged in the lower part of bottle body side, along horizontal or oblique direction of illumination, the scattering characteristics of suspended impurities are strengthened;Polarized light illumination unit is arranged at a certain angle with side light.This utility model provides a kind of composite optical illumination device based on structured light backlight, low-angle side light and polarized light compensation, for enhancing the imaging contrast of impurity in bottle, reduce background interference, significantly improve the recognition accuracy of visual detection system to foreign matter in bottle.

Description

Technical Field

[0001] This utility model relates to the field of machine vision inspection technology, and in particular to a device for enhancing the detection of impurities in transparent beverage bottles based on multimodal optical illumination, which can be used in high-precision visual imaging systems to improve the contrast and development capability of impurity detection. Background Technology

[0002] In modern beverage production lines, the detection of impurities in transparent beverage bottles (such as mineral water, fruit juice, and functional beverages) has become a critical step affecting product quality and food safety. Current methods for detecting foreign objects in bottles mainly rely on a combination of ordinary white light illumination and traditional industrial cameras for imaging and analysis. However, these methods have the following drawbacks: 1) Impurities have weak contrast and are easily affected by the color and transparency of the liquid; 2) Strong background reflection interference, especially high-gloss reflection from the plastic bottle wall or liquid surface; 3) Static light sources have a single imaging angle, making it difficult to highlight transparent or micro-particle foreign objects.

[0003] Therefore, there is an urgent need for an optical illumination device with directional, structural, and polarization control capabilities to improve the imaging contrast of impurities in bottles and enhance the stability and robustness of machine vision inspection systems. Utility Model Content

[0004] To address the aforementioned technical issues, this invention presents a multimodal optical illumination-based enhanced device for detecting impurities in transparent beverage bottles. This device is a composite optical illumination device based on structured backlighting, low-angle sidelighting, and polarization compensation. It enhances the imaging contrast of impurities in the bottle, reduces background interference, and significantly improves the accuracy of visual inspection systems in identifying foreign objects inside the bottle.

[0005] The present invention adopts the following technical solution: An enhanced device for detecting impurities in transparent beverage bottles based on multimodal optical illumination includes an industrial camera, a structured light backlight unit, a low-angle sidelight unit, and a polarized light illumination unit. An industrial camera takes pictures from top to bottom along the bottle opening; a structured light backlight unit is set on the opposite side of the beverage bottle to provide a structured light background with directionality and strong contrast; a low-angle sidelight unit is arranged on the lower side of the bottle to illuminate in a horizontal or oblique upward direction to enhance the scattering characteristics of suspended impurities; a polarized light illumination unit is arranged at a certain angle with the sidelight.

[0006] Preferably, the polarized light illumination unit is equipped with a polarizer to control the polarization direction of the illumination light.

[0007] Preferably, a polarizing filter unit is installed in front of the industrial camera lens. The polarizing filter unit is perpendicular to the polarized light emitted from the polarizing illumination unit to filter interference from reflections on the bottle wall surface. The polarizing illumination unit and the polarizing filter unit are configured in a cross-polarization configuration, which can significantly suppress specular highlights generated by the bottle wall while enhancing the scattering components of non-spectral impurities.

[0008] Preferably, the system also includes a bottle support device and a motion mechanism for fixing and transporting the transparent beverage bottle through the illumination channel formed by the structured light backlight unit, the low-angle side light unit, and the polarized light illumination unit.

[0009] Preferably, the structured light backlight is a planar grating structure LED light source or a parallel stripe lens module light source. This can create a striped background with good directionality, obscuring images of small impurities.

[0010] Preferably, the side light source uses a low-angle diffused ring LED module and is equipped with a spot-forming lens group, making its illumination angle adjustable.

[0011] The beneficial effects of this utility model are: (1) Multi-channel illumination enhancement imaging: Combining backlight and sidelight illumination paths enhances the visibility of impurities inside the bottle. The cross-polarization structure formed by the polarization illumination unit and the polarization filter unit has strong anti-interference ability: greatly reduces the reflection artifacts of the bottle wall and liquid surface; (2) The development effect on transparent and semi-transparent impurities is obvious: such as plastic filaments, fruit pulp sediment, etc.; (3) It is compatible with high-speed production line vision inspection system, with a compact structure and fast response; (4) The optical path angle is adjustable, with good versatility and compatibility, and is suitable for various bottle types and liquid backgrounds. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 1. Industrial camera, 2. Structured light backlight unit, 3. Low-angle side light unit, 4. Polarized light illumination unit. Detailed Implementation

[0013] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example: Figure 1 As shown, a transparent beverage bottle impurity detection enhancement device based on multimodal optical illumination includes an industrial camera 1, a structured light backlight unit 2, a low-angle side light unit 3, and a polarized light illumination unit 4. An industrial camera takes pictures from top to bottom along the bottle opening; a structured light backlight unit is set on the opposite side of the beverage bottle to provide a structured light background with directionality and strong contrast; a low-angle sidelight unit is arranged on the lower side of the bottle to illuminate in a horizontal or oblique upward direction to enhance the scattering characteristics of suspended impurities; a polarized light illumination unit is arranged at a certain angle with the sidelight.

[0014] The polarized light illumination unit is equipped with a polarizer to control the polarization direction of the illumination light.

[0015] A polarizing filter unit is mounted in front of the industrial camera lens. The polarizing filter unit is positioned perpendicular to the polarized light emitted from the polarized illumination unit to filter interference from reflections on the bottle wall surface. The polarized illumination unit and the polarizing filter unit are configured in a cross-polarization configuration, which can significantly suppress specular highlights generated by the bottle wall while enhancing the scattering components of non-spectral impurities.

[0016] This utility model also includes a bottle support device and a motion mechanism for fixing and transporting the transparent beverage bottle through the lighting channel formed by the structured light backlight unit, the low-angle side light unit and the polarized light illumination unit.

[0017] The structured light backlight is either a planar grating structure LED light source or a parallel stripe lens module light source. It can form a striped background with good directionality and create an image that obscures small impurities.

[0018] The side light source uses a low-angle diffused ring LED module and is equipped with a spot-shaping lens group, making its illumination angle adjustable.

[0019] This invention features multi-channel illumination enhancement imaging: combining backlight and sidelight illumination paths to enhance the visibility of impurities inside the bottle; the cross-polarization structure formed by the polarization illumination unit and polarization filter unit has strong anti-interference capabilities, significantly reducing bottle wall and liquid surface reflection artifacts; it has a significant development effect on transparent and semi-transparent impurities, such as plastic filaments and fruit pulp sediment; it is compatible with high-speed automated visual inspection systems, with a compact structure and fast response; the optical path angle is adjustable, possessing good versatility and compatibility, and is suitable for various bottle types and liquid backgrounds.

[0020] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A device for enhancing the detection of impurities in transparent beverage bottles based on multimodal optical illumination, characterized in that, It includes an industrial camera, a structured light backlight unit, a low-angle side light unit, and a polarized light illumination unit; An industrial camera takes pictures from top to bottom along the bottle opening; a structured light backlight unit is set on the back side of the beverage bottle to provide a structured light background with directionality and strong contrast; a low-angle sidelight unit is arranged on the lower side of the bottle to illuminate in a horizontal or oblique upward direction to enhance the scattering characteristics of suspended impurities. The polarized light illumination unit is arranged at a certain angle with the side light.

2. The enhanced device for detecting impurities in transparent beverage bottles based on multimodal optical illumination according to claim 1, characterized in that, The polarized light illumination unit is equipped with a polarizer to control the polarization direction of the illumination light.

3. The enhanced device for detecting impurities in transparent beverage bottles based on multimodal optical illumination according to claim 1, characterized in that, A polarizing filter unit is installed in front of the lens of the industrial camera. The polarizing filter unit is set perpendicular to the polarized light emitted by the polarized light illumination unit to filter out interference reflected from the bottle wall surface.

4. The enhanced device for detecting impurities in transparent beverage bottles based on multimodal optical illumination according to claim 1, characterized in that, It also includes a bottle support device and a motion mechanism for fixing and transporting the transparent beverage bottle through the lighting channel formed by the structured light backlight unit, the low-angle side light unit and the polarized light illumination unit.

5. The enhanced device for impurity detection in transparent beverage bottles based on multimodal optical illumination according to claim 1, characterized in that, The structured light backlight unit is a planar grating structure LED light source or a parallel stripe lens module light source.

6. The enhanced device for detecting impurities in transparent beverage bottles based on multimodal optical illumination according to claim 1, characterized in that, The low-angle side-light unit adopts a low-angle diffused ring LED module and is equipped with a spot-forming lens group.

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