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A visual inspection method and device based on virtual reality technology

A virtual reality technology and visual inspection technology, applied in the field of online product feature detection, can solve the problems of heavy system adjustment work and large number of images

Inactive Publication Date: 2019-08-23
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its detection principle requires that the shooting angle of the object to be married must be strictly consistent with that of the standard object, so that a complex and precise positioning mechanism needs to be designed on the production line; in addition, in many detection occasions, it is necessary to take a variety of possible standard images in advance. In this case, the number of images is huge, resulting in a heavy workload for system adjustment

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  • A visual inspection method and device based on virtual reality technology
  • A visual inspection method and device based on virtual reality technology
  • A visual inspection method and device based on virtual reality technology

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specific Embodiment approach

[0093] 1) The computer controls the digital camera to take a picture of the ring logo on the detection platform, and obtains the pixel coordinates (ui, vi) of the sub-ring logo picture;

[0094] 2) Utilize the ring mark on the detection platform to establish a ring mark coordinate system;

[0095] 3) By taking the image I of the object to be detected, determine the placement center position P of the object on the detection platform in the circle marking coordinate system;

[0096] 4) Generating the virtual image sequence Is of the digital model of the standard object at the position P. Standard virtual objects in these images have different z-axis rotation parameters.

[0097] 5) Compare the images in image I and Is. If I matches at least one image in the Is sequence image (similarity exceeds the acceptance threshold), the object to be detected is considered to have no significant difference from the standard object; otherwise, it is considered to have a significant differen...

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Abstract

The invention relates to an on-line product characteristic detection method and system, in particular to a visual detection method and device based on a virtual reality technology. The invention provides the visual detection method and device by aiming at problems in the prior art. The system is characterized in that a circular ring identification coordinate system is firstly obtained through transformation according to an image coordinate system; after an image of an object to be detected is shot, a digital model of a standard object is virtually projected to a previous circular ring coordinate system, and a virtual standard object image is generated; and then, a comparison detection method is used for judging a difference between a real shot image and the virtual standard object image so as to determine whether a product is a qualified product or not. The virtual standard object image generated each time can be directly stored for subsequent detection and comparison and also can be dynamically generated. In addition, in order to reduce an amount of the virtual standard object images, features which can be used for estimating the spatial position of an object image to be detected can be firstly extracted from the object image to be detected, then, only the virtual standard object images on a plurality of possible positions can be generated, a data processing amount is effectively lowered, and detection time is effectively shortened.

Description

technical field [0001] The invention relates to an online product feature detection method and system, in particular to a visual detection method and device based on virtual reality technology. Background technique [0002] Visual inspection refers to converting the captured target into a digital image through an image capture device (currently CMOS or CCD), and transmitting it to a special image processing system; the image processing system forms the target object according to information such as pixel distribution, color, brightness, etc. ; By analyzing the characteristics of the target object or comparing with the standard characteristics, the discrimination result is formed, and then the relevant equipment is controlled to deal with various situations. It is widely used in production line defect detection. [0003] A typical visual inspection system is mainly composed of the following parts: lighting source, digital camera and lens, image processing software / hardware s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00
CPCG06T7/001G06T2207/30108
Inventor 王德麾樊庆文李焕
Owner SICHUAN UNIV
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