Calibration Target Accuracy Verification Using GOM 3D Inspection

Calibration accuracy directly depends on the quality of the calibration target. Even micron-level deviations can introduce significant errors in machine vision systems. At Calibvision, all calibration targets can be verified using professional 3D optical inspection methods. This page demonstrates how we evaluate geometric accuracy using a GOM 3D inspection system.

GOM 3D Inspection Method

We use a full-field 3D optical measurement system (GOM ATOS) to evaluate the calibration target.

The process includes:

This method enables high-resolution, non-contact measurement of the entire calibration target.

Product Model：VMP-050SG-40-BRC
Manufacturer：Calibvision
Inspection System：GOM 3D Optical Measurement System
Report ID：CV-TR-2026-001
Date：2026-03-24

What is GOM 3D Inspection in Calibration Verification?

GOM 3D inspection in calibration verification is a high-precision optical measurement method used to validate the geometric accuracy of calibration targets.

It uses structured light scanning to capture the full-field 3D geometry of a target, generating dense point cloud data. This data is then compared with the nominal design to evaluate key parameters such as:

Unlike traditional 2D measurement methods, GOM systems provide area-based measurement instead of point-based sampling, allowing a more comprehensive and reliable verification of calibration targets.

This method is widely used in machine vision and metrology applications where sub-micron to micron-level accuracy is required. It ensures that the calibration target performs as expected in real-world measurement systems.

What We Measure

We evaluate the following critical parameters as key inspection term:

Dot spacing accuracy

Feature position accuracy

Global geometric deviation

Surface flatness

Visual Inspection Results

Horizontal Spacing Error

Measured accuracy of dot spacing between column Line	1	2	3	4	5	6	7
Dots between Seg 1-2(μm)	0.3031	0.5636	0.5411	0.4391	0.3116	0.4125	0.4669
Dots between Seg 2-3(μm)	0.1783	0.6655	0.6496	0.3142	0.1718	0.2954	0.3183
Dots between Seg 3-4(μm)	0.2893	0.8104	0.7821	0.1707	0.2895	0.4161	0.1876
Dots between Seg 4-5(μm)	0.4017	0.6753	0.6728	0.3059	0.4244	0.3053	0.6876
Dots between Seg 5-6(μm)	0.9017	0.81	0.8165	0.4079	0.5377	0.4261	0.4075
Dots between Seg 6-7(μm)	0.7933	0.663	0.6991	0.2848	1	0.5476	0.532
Mean	0.4779	0.698	0.6935	0.3204	0.4558	0.4005	0.4333
StdDev	0.271	0.0876	0.09	0.0872	0.2686	0.0844	0.158
Min	0.1783	0.5636	0.5411	0.1707	0.1718	0.2954	0.1876
Max	0.9017	0.81	0.8165	0.4391	0.5377	0.5476	0.6876

VMP-050SG-40-BRC Horizontal Spacing Full Consistency Analysis

Vertical Spacing Error

Measured accuracy of dot spacing between column Line	1	2	3	4	5	6	7
Dots between Row 1-2(μm)	0.3746	0.2521	0.3651	0.2558	0.4035	0.5278	0.4081
Dots between Row 2-3(μm)	0.4054	0.5136	0.8696	0.2495	0.3856	0.2544	0.3645
Dots between Row 3-4(μm)	0.586	0.6888	0.825	0.6839	0.5673	0.1713	0.563
Dots between Row 4-5(μm)	0.5522	0.4341	0.2985	0.4222	0.2835	0.1682	0.298
Dots between Row 5-6(μm)	0.5407	0.4157	0.5353	0.4259	0.5303	0.4107	0.2908
Dots between Row 6-7(μm)	0.4405	0.2958	0.1536	0.2921	0.4371	0.0586	0.6749*
Mean	0.4832	0.4333	0.5078	0.3882	0.4346	0.2652	0.4332
StdDev	0.0799	0.1436	0.2652	0.1506	0.094	0.1587	0.1409
Min	0.3746	0.2521	0.1536	0.2495	0.2835	0.1713	0.2908
Max	0.586	0.6888	0.8696	0.6839	0.5673	0.5278	0.563

VMP-050SG-40-BC Vertical Spacing Full Consistency Analysis

Overall dot spacing error in μm

Direction	Samples	Mean (μm)	StdDev (μm)	Max (μm)
Horizontal Segments (X)	42 Segs	0.5315	0.1313	0.9034
Vertical Rows (Y)	42 Gaps	0.4431	0.1415	0.8696
Global Centroid Position	49 Pts	0.4872	0.1255	0.9433

Impact on Calibration Performance

These verified results ensure:

Higher calibration accuracy

Lower reprojection error

Stable long-term performance

Reliable measurement results

Verified Accuracy & Inspection Report Service

At Calibvision, accuracy is not just specified — it can be measured and verified.

Each calibration target can be provided with a dedicated inspection report upon request, using professional GOM 3D optical measurement methods.

Third-party verification can also be arranged upon request, depending on project requirements.