3D Shading Correction for Varying Inspection Distances
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Solution Overview
Problem
Conventional shading correction methods fail to accurately correct for uneven light intensity when inspecting three-dimensional objects whose distance and orientation relative to the illumination light source and imaging camera change during imaging, leading to suboptimal inspection results.
Innovation Solution
A three-dimensional object inspecting device that includes a light source, detector, orientation information acquisition component, three-dimensional shading corrector, and inspection component, which performs three-dimensional shading correction based on shape information and orientation data to ensure consistent inspection results despite varying distances and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional shading correction is used for three-dimensional objects, then inspection is simple for planar objects, but inspection accuracy deteriorates when distance or orientation varies
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional two-dimensional shading correction parameters to three-dimensional shading correction parameters that incorporate depth information (Z-coordinate). The correction process uses working distance information and orientation data to dynamically adjust correction coefficients for each pixel based on its three-dimensional position, thereby maintaining inspection accuracy across varying distances and orientations while preserving operational simplicity through automated processing.
2Adaptability or versatility
If the distance from illumination source and camera to inspection portion varies, then adaptability to three-dimensional objects improves, but shading correction accuracy deteriorates
Solution Approach 1:
The patent implements dimensionality change by extending the shading correction process from two-dimensional image space to three-dimensional object space. It introduces the Z-coordinate (depth/distance) as an additional dimension, creating a three-dimensional correction model that accounts for variations in working distance and orientation. This allows the system to adapt to three-dimensional objects while maintaining correction accuracy by calculating position-dependent correction coefficients based on three-dimensional geometric relationships between the illumination source, camera, and inspection portions.
3Measurement precision
If three-dimensional shading correction is implemented, then inspection accuracy for varying distances improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing three-dimensional shading correction information for multiple predetermined working distances and orientations before actual inspection. During inspection, the system simply retrieves the appropriate pre-computed correction data based on the current working conditions and applies it to the captured image. This approach maintains high inspection accuracy through comprehensive three-dimensional correction while reducing real-time computational complexity by performing the intensive calculations in advance.
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 effective shading correction and accurate inspection of three-dimensional objects by accounting for changing distances and orientations, ensuring reliable inspection results even when the object's position and orientation vary relative to the illumination and imaging components.
Implementation Method 1
a light source that emits light energy toward an inspection region set for the three-dimensional object
Implementation Method 2
a detector that detects radiant energy radiated from the inspection region
Data Source
AI summary
A three-dimensional object inspecting device for inspecting a three-dimensional object includes a light source, a detector, an orientation information acquisition component, a three-dimensional shading corrector, and an inspection component. The light source emits light energy toward an inspection region set for the three-dimensional object. The detector detects radiant energy radiated from the inspection region. The orientation information acquisition component acquires orientation information about the light source and the detector with respect to the inspection region. The three-dimensional shading corrector performs three-dimensional shading correction on information corresponding to the radiant energy detected by the detector, based on shape information about the three-dimensional object in the inspection region, the orientation information, and shading correction information for a planar image detected by the detector for each of a plurality of working distances. The inspection component performs an inspection based on the information on which the three-dimensional shading correction has been performed.