CN-122016820-A - Multi-angle automatic detection system and method for appearance of mobile phone based on multi-surface reflection structure

CN122016820ACN 122016820 ACN122016820 ACN 122016820ACN-122016820-A

Abstract

The invention relates to the technical field of physical property test, and discloses a multi-angle automatic detection system and method for the appearance of a mobile phone based on a multi-surface reflection structure, wherein the system comprises a panorama acquisition unit, a multi-surface reflection mechanism and a multi-surface reflection mechanism, wherein the panorama acquisition unit is used for acquiring an original panoramic image of the mobile phone to be detected, which is formed by the multi-surface panorama reflection mechanism; the system comprises a standard data storage unit for storing standardized three-dimensional model data of a mobile phone to be tested, a central processing unit for establishing the three-dimensional model data as a space measurement standard, constructing an optical path mapping matrix according to distribution parameters, mapping a surface grid of the three-dimensional model data to a camera coordinate system to determine geometric distortion sampling coordinates, further extracting pixels to complete space topology reconstruction and generate a standardized surface expansion diagram, and a defect detection module for analyzing characteristics in the surface expansion diagram.

Inventors

SU JIANCAI
GONG FAN
BIAN XUYANG
LI RUI
ZHANG HENG

Assignees

西安腾为计算机系统有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260403

Claims (9)

1. A mobile phone appearance multi-angle automatic detection system based on a multi-face reflection structure is characterized by comprising: The panorama acquisition unit is used for acquiring an original panoramic image formed by the mobile phone to be tested through the multi-surface panorama reflection mechanism; the reference data storage unit is used for storing standardized three-dimensional geometric model data of the mobile phone to be tested; The central processing unit comprises a space mapping module, a sampling pixel position and physical topological position, wherein the space mapping module is used for establishing standardized three-dimensional geometric model data as a space measurement reference and constructing an optical path mapping matrix of each sampling pixel position and each physical topological position according to the geometric distribution parameters of the reflecting surface of the multi-surface panoramic reflection mechanism and the optical center position parameters of the panoramic acquisition unit; The distortion correction module is used for reversely projecting the surface grid of the standardized three-dimensional geometric model data to a camera coordinate system through the optical path mapping matrix, and calculating geometric distortion sampling coordinates of each node of the surface grid; The image reorganization module is used for extracting pixels from the original panoramic image according to the geometric distortion sampling coordinates, carrying out space topology reconstruction, and outputting a standardized surface development chart which eliminates nonlinear perspective distortion and is closely aligned with the physical three-dimensional structure of the mobile phone to be tested; the defect detection module is used for extracting defect characteristics from the standardized surface development diagram and judging the surface quality grade of the mobile phone to be detected according to the physical size and the distribution density of the defect characteristics.
2. The multi-angle automatic detection system for the appearance of the mobile phone based on the multi-face reflection structure according to claim 1 is characterized in that the central control unit is further used for carrying out illumination normalization correction on a standardized surface unfolded graph, calculating an included angle cosine value between a normal vector corresponding to each sampling pixel point and an optical axis by using a space optical path mapping matrix, determining a brightness gain coefficient of each sampling pixel point according to the included angle cosine value, carrying out brightness correction mapping on pixels extracted from an original panoramic image so as to eliminate local illumination difference inside the multi-face panoramic reflection device, and enabling a pixel gray value in the outputted standardized surface unfolded graph to represent physical reflectivity characteristics of the surface of the mobile phone to be detected.
3. The multi-angle automatic detection system for the appearance of a mobile phone based on a multi-surface reflection structure according to claim 1 is characterized in that the multi-surface panoramic reflection device comprises an octahedral precision reflection structure, the octahedral precision reflection structure is made of optical float glass, and an included angle between adjacent reflection surfaces is in a range of 78 DEG to 90 deg.
4. The multi-angle automatic detection system for the appearance of the mobile phone based on the multi-face reflection structure, which is disclosed in claim 1, is characterized by further comprising a uniform illumination module, wherein the uniform illumination module is used for providing 360-degree surrounding illumination for the mobile phone to be detected so as to realize the omnibearing imaging of the front face, the back face, four frames and four inclined planes of the mobile phone to be detected by matching with a multi-face panoramic reflection device, and when identifying defect characteristics, a central control unit performs regional cutting on an original panoramic image through an image segmentation recombination module and feeds the cut characteristic tensor into a surface characteristic extraction module so as to identify five physical defects such as scratches, bumps, cracks, abrasion and discoloration.
5. The multi-angle automatic detection system for the appearance of the mobile phone based on the multi-surface reflection structure, which is disclosed in claim 1, is characterized by further comprising a multi-interface data reading module, wherein the multi-interface data reading module is used for reading hardware parameters and security check information of the mobile phone to be detected, and the central control unit correlates the hardware parameters, the security check information and the surface quality grading data to generate a comprehensive detection report.
6. The multi-angle automatic detection system for mobile phone appearance based on multi-face reflection structure of claim 5, wherein the central control unit is further integrated with a data synchronization interface for sending the comprehensive detection report to the background management system in real time through the API interface, and generating recovery pricing data according to preset residual value calculation rules.
7. The multi-angle automatic detection system for the appearance of a mobile phone based on a multi-surface reflection structure according to claim 1, wherein the central control unit is used for correcting the physical position deviation of the multi-surface panoramic reflection device by extracting the edge calibration point coordinates of each reflection surface in the original panoramic image when constructing a spatial optical path mapping matrix.
8. The multi-angle automatic detection system for the appearance of the mobile phone based on the multi-surface reflection structure, as set forth in claim 1, is characterized in that the standard data storage unit stores standardized three-dimensional topology libraries of mobile phones of different models, and the central control unit automatically matches corresponding model data from the standardized three-dimensional topology libraries by reading the equipment identification of the mobile phone to be detected so as to replace the measurement standard reference system in real time.
9. The multi-angle automatic detection method for the appearance of the mobile phone based on the multi-surface reflection structure is used for realizing the multi-angle automatic detection system for the appearance of the mobile phone based on the multi-surface reflection structure, and is characterized by comprising the following steps: the method comprises the steps of acquiring an original panoramic image of a mobile phone to be tested, which is formed by a multi-surface panoramic reflection mechanism, through the panoramic acquisition unit, acquiring standardized three-dimensional geometric model data of the mobile phone to be tested from the reference data storage unit, and establishing the standardized three-dimensional geometric model data as a space measurement reference; The central processing unit calculates an optical path mapping matrix of each sampling pixel site in the original panoramic image and a physical topological site in the space measurement reference by utilizing an optical reflection law according to the geometric distribution parameter of the reflecting surface of the multi-surface panoramic reflection mechanism and the optical center position parameter of the panoramic acquisition unit; The central processing unit reversely projects the surface grid of the standardized three-dimensional geometric model data to a camera coordinate system through the optical path mapping matrix, and geometric distortion sampling coordinates of all nodes of the surface grid are determined; The central processing unit extracts pixels from the original panoramic image according to the geometric distortion sampling coordinates and completes space topology reconstruction, and a standardized surface expansion diagram which eliminates perspective distortion and is aligned with a physical three-dimensional structure of the mobile phone to be tested is generated; the central processing unit extracts defect characteristics from the standardized surface development diagram, and judges the surface quality grade of the mobile phone to be tested according to the physical size and the distribution density of the defect characteristics.

Description

Multi-angle automatic detection system and method for appearance of mobile phone based on multi-surface reflection structure Technical Field The invention relates to the technical field of physical property testing, in particular to a multi-angle automatic detection system and method for the appearance of a mobile phone based on a multi-surface reflection structure. Background In the technical mode, a detection system usually adopts a multi-angle reflection optical structure to acquire panoramic images containing detection surfaces of a mobile phone at a time, so that the detection efficiency is improved, the integrity of a detection coverage is ensured, an optical reflection imaging follows a perspective projection principle, object table features are projected to an image sensor area array through a reflection surface, the imaging quality depends on the consistency of an optical path and the linearity of an object-image relation, however, as the detection precision evolves towards a micron level, complex morphological features such as an arc-shaped frame, four inclined planes and the like of the mobile phone generate nonlinear topological distortion and resolution gradient change when the reflection surface with a specific inclination angle is projected to a two-dimensional image sensor, the efficiency advantage pursuing panoramic imaging is accompanied with information distortion in the object-image space conversion process, so that photoelectric signals acquired by the sensor cannot directly reflect the real physical dimensions of a detected object, and an inherent constraint for restricting high-precision physical measurement is formed. The traditional improvement thought is often focused on increasing the number of image acquisition equipment or improving the pixel scale of a sensor, but can not eliminate the physical scale distortion caused by optical path transformation from a physical mechanism, the design thought simplifies the measurement problem of a three-dimensional physical space into a two-dimensional image layer identification task, peels off the real geometric space attribute of a target, and leads a detection system to be unable to maintain a constant physical measurement reference in a distortion area, for example, chinese patent publication No. CN112634173B discloses a curved surface screen image correction method and system, characteristic points are extracted through a screen display checkerboard pattern, a correction matrix is generated by utilizing coordinate mapping to complete image stitching, but the scheme is based on a two-dimensional image characteristic matching, a linear projection relation is preset between object images, when the detection system evolves towards micron-level precision and a complex optical path is turned by a multi-surface precise reflection structure, the two-dimensional visual calibration is difficult to compensate the nonlinear topological deformation of the curved surface morphology, so that the physical scale deviates in the distortion area, the scheme has strict requirements on the consistency of the measured target gesture, and is unable to maintain a constant physical balance standard under the working condition. Therefore, how to construct a system capable of eliminating the interference of complex reflection light paths and restoring the measurement standard of the real physical topological structure of the mobile phone to realize the objective physical attribute characterization of minor flaws becomes the technical problem to be solved by the invention. Disclosure of Invention The invention provides a multi-angle automatic detection system for the appearance of a mobile phone based on a multi-surface reflection structure, which comprises the following components: The panorama acquisition unit is used for acquiring an original panoramic image formed by the mobile phone to be tested through the multi-surface panorama reflection mechanism; the reference data storage unit is used for storing standardized three-dimensional geometric model data of the mobile phone to be tested; The central processing unit comprises a space mapping module, a sampling pixel position and physical topological position, wherein the space mapping module is used for establishing standardized three-dimensional geometric model data as a space measurement reference and constructing an optical path mapping matrix of each sampling pixel position and each physical topological position according to the geometric distribution parameters of the reflecting surface of the multi-surface panoramic reflection mechanism and the optical center position parameters of the panoramic acquisition unit; The distortion correction module is used for reversely projecting the surface grid of the standardized three-dimensional geometric model data to a camera coordinate system through the optical path mapping matrix, and calculating geometric distortion sampling coordinates of each node of the surface