Optical Inspection System for Moving Subjects Using Image Composition
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Solution Overview
Problem
Current optical inspection systems face challenges in effectively composing surface images of moving subjects with varying shapes and orientations, particularly in capturing defect identification images efficiently and accurately, due to limitations in illumination and image acquisition techniques.
Innovation Solution
A processing apparatus and optical inspection system that shifts and superimposes multiple captured images of a subject's surface, irradiated with illumination light from different directions, to compose a comprehensive surface image, while also employing a color opening with wavelength selection regions to enhance defect identification through selective light passage and image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple captured images are shifted and superimposed to compose surface images of moving subjects, then measurement precision and defect identification accuracy are improved, but device complexity and processing time increase
Solution Approach 1:
The system performs preliminary actions by capturing multiple images at different positions along the conveying direction before composition is needed. These pre-captured images are stored and then shifted and superimposed later to create the final surface composition image, enabling accurate defect identification without requiring complex real-time processing
Solution Approach 2:
The surface imaging process is segmented into multiple discrete image captures taken at different positions along the conveying direction. Each captured image represents a segment of the surface, and these segmented images are subsequently shifted and superimposed to form the complete surface composition image
2Manufacturing precision
If multiple captured images are shifted and superimposed to compose surface images, then manufacturing precision of surface inspection is improved, but productivity decreases due to increased processing time
Solution Approach 1:
Multiple images are captured in advance during the conveying process before the composition operation. This preliminary capture of images at different positions allows the system to perform accurate surface inspection through subsequent shifting and superimposition without slowing down the production line
Solution Approach 2:
The system transitions from capturing images at a single position to capturing images along the conveying direction (adding a temporal and spatial dimension). This multi-dimensional approach enables comprehensive surface inspection by combining images taken at different positions, improving precision while maintaining productivity
3Measurement precision
If a color opening with wavelength selection regions is used to enhance defect identification, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The color opening incorporates wavelength selection regions with different local properties - each region is configured to transmit specific wavelength bands. This local differentiation in optical properties enables enhanced defect identification by allowing selective transmission of different wavelengths to the imaging portion, improving precision while maintaining a relatively simple overall structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and efficient surface composition and defect identification for subjects with complex shapes and orientations, improving the precision and speed of defect detection by optimizing image acquisition and processing techniques.
Implementation Method 1
capturing an image of a surface of the object with light reflected from the surface of the object
Implementation Method 2
employing a color opening with wavelength selection regions to enhance defect identification through selective light passage
Data Source
AI summary
According to an embodiment, a processing apparatus includes one or more processors. The one or more processors are configured to: shift one or more captured images selected from a plurality of captured images including a reference captured image, and compose at least one subject surface image by superimposing the shifted one or more captured images on the reference captured image. The plurality of captured images have been obtained with an imaging portion within a predetermined time while a surface of a subject moving relative to the illumination light is irradiated with a plurality of beams of illumination light traveling in different directions in at least one plane.