Intrinsic Calibration at Fourier Lab

Precise calibration of internal camera parameters is essential for any system relying on spatial accuracy — whether for 3D reconstruction, stereo depth, or neural network preprocessing. Our intrinsic calibration service models focal length, principal point, and distortion with sub-pixel accuracy, enabling highly reliable downstream performance. It’s already deployed in production environments across mobile, automotive, and robotics sectors.

checker board at different angles

At Fourier Image Lab, in collaboration with Yanding Tech, we deploy both semi-automatic and fully-automatic intrinsic calibration systems, each tailored for distinct stages of the development lifecycle — from flexible research to high-throughput manufacturing. Both systems feature our proprietary 6-axis motion stage, precision-engineered checkerboard targets, controlled lighting environments, and integrated analysis software.

semi-automatic module

The semi-automatic system is ideal for R&D labs, offering control and customization for tuning experiments.

prodction line machine

Meanwhile, the fully-automated line is purpose-built for production, incorporating frame grabbers and factory-ready software to achieve repeatable, operator-independent results at scale.

camera models

We support multiple camera models including pin-hole, fisheye (KB), and MEI, ensuring broad applicability across industries.

Calibration outcomes are assessed against key KPIs: center of distortion (COD), effective focal length (EFL), and distortion coefficients, with Gauge Repeatability and Reproducibility (GRR) consistently under 10%.

metrics and KPIs

Validation is as critical as calibration. Our system applies triangulation-based validation, comparing the calculated and physical distances between high-precision chart pairs. Using carefully aligned targets and robust geometry analysis, we evaluate angular and positional accuracy — ensuring the calibrated intrinsics hold under real-world spatial constraints.

validation stand

Results consistently demonstrate high linearity, low BRPE, and excellent coverage across fields of view, from narrow (60°) to ultra-wide (120°).

The UI offers intuitive control and analysis through touch panels and PC-based interfaces. The hardware supports scalable deployments, from lab setups to full assembly lines.

validation

This intrinsic calibration service is a cornerstone of broader imaging quality assurance workflows — used alongside modules measuring MTF, distortion, chromatic aberration, color uniformity, and flicker, forming a complete image system validation suite.

calibration result