Balancing Hardware and Digital Corrections in Modern Imaging Systems Using ImSym
As imaging systems become more sophisticated, the challenges of verifying performance across optics, sensors, and digital processing have grown dramatically.
Optical designers and system engineers are under pressure to validate image quality sooner, build fewer physical prototypes, and deliver predictable performance earlier in the development cycle. Traditional hardware‑first workflows rarely support that goal—they are slow, expensive, and vulnerable to delays at every stage.
ImSym - Imaging System Simulator, Keysight’s system‑level imaging simulation platform, offers a new approach. By modeling the complete imaging chain—from optical design to sensor behavior and ISP processing—ImSym enables teams to evaluate performance before hardware exists. This shift accelerates development, reduces risk, and empowers engineers to solve complex image‑quality problems using both optical and digital strategies.
ImSym: A Complete System‑Level Imaging Simulator
ImSym integrates optical data from CODE V and LightTools into a unified simulation pipeline that accurately represents lenses, sensors, stray light, color processing, and ISP operations. Teams can simulate real‑world inputs using any scene object and generate radiometrically accurate output images to evaluate system‑level performance long before prototypes are built.
The platform also supports Python‑based customization, enabling engineers to test their own image‑processing algorithms directly within the simulation environment. From tuning ISP modules to studying sensor noise and relative angular response, ImSym gives engineers full visibility into how each component contributes to the final image.
The workflow in the ImSym platform
The Problem with Hardware‑First Imaging Development
Most camera and imaging pipelines today rely heavily on physical prototypes to measure image quality. While necessary, this approach introduces several limitations:
- Long prototype manufacturing cycles delay discovery of system‑level issues
- Redesigns late in the process can impact cost, schedule, and yield
- Optical, sensor, mechanical, and ISP teams often operate in silos
- Complex interactions—such as stray light or image‑processing artifacts—cannot be evaluated early
- Hardware dependencies slow verification of key requirements
- Iterations accumulate expenses across development phases
These challenges make it difficult for teams to maintain consistent timing, control costs, and meet performance requirements. Simulation offers a more efficient path.
The traditional workflow between optical designers, light engineers, manufacturers, OEMs and partners
How ImSym Shifts Verification Left
ImSym makes it possible to verify imaging performance earlier by simulating the entire optical‑to‑digital pipeline. Instead of waiting for prototypes, system engineers can evaluate lens performance, distortion, ISP behavior, and overall image quality directly within ImSym.
This shift enables organizations to:
- Validate system and subsystem requirements before hardware is built
- Test and refine ISP algorithms using simulated sensor data
- Identify image‑quality issues virtually and correct them sooner
- Reduce costly prototype cycles and avoid late‑stage redesigns
- Improve alignment across optical, sensor, and system engineering teams
By integrating a virtual imaging pipeline into the systems engineering process, teams gain the ability to gate hardware builds based on simulation results—reducing risk and improving predictability.
With ImSym, the software design and simulation are done in ImSym, reducing risk and leading to a faster time to market
Case Study: Correcting Distortion Without a Lens Redesign
In our example scenario, a lens system meets all performance requirements except distortion. Significant barrel distortion caused corner features—such as faces in a test image—to appear unnatural. Redesigning the lens would jeopardize schedule and cost commitments, making it an impractical option.
Simulating and Measuring Distortion
Using ImSym, the engineering team:
- Simulated the full imaging pipeline with the existing lens design
- Inserted a distortion measurement target into the scene
- Compared the simulated target to a paraxial reference
- Fit the distortion error using a fifth‑order polynomial
- Used ImSym’s Python API to implement a custom ISP correction block
The result is a digitally corrected image that more closely matched the original scene object—without modifying the optical design. This allowed hardware builds to proceed on schedule while still meeting the distortion specifications.
Using ImSym to view and correct image distortions
Accelerating Testing, Calibration, and Manufacturing Readiness
ImSym also helps teams prepare for manufacturing by enabling earlier development of automated test and calibration workflows. By simulating image‑quality targets such as MTF charts, dot patterns, and color grids, teams can validate test algorithms before hardware arrives.
This reduces bring‑up time for manufacturing test stations, ensures accurate placement of test fixtures within device fields of view, and facilitates smoother transition into production.
Assessing quality between engineers, ImSym, and manufacturers
High‑Performance Simulation with GPU Acceleration
Fast iteration is essential for evaluating system trade‑offs. ImSym integrates GPU acceleration to dramatically reduce simulation time. In the referenced example, a 0.25‑megapixel simulation completed in under one minute on a laptop equipped with an NVIDIA RTX 2000 GPU, while subsequent iterations completed in under five seconds. Depending on the GPU, performance improvements can reach up to 100×.
This speed enables engineers to rapidly test scenarios, adjust parameters, and refine ISP algorithms with minimal waiting—boosting productivity across the development cycle.
Comparing GPU speeds
Conclusion
As optical systems grow more complex, traditional hardware‑driven development can no longer keep pace. ImSym provides a powerful alternative: a complete system‑level simulation platform that allows teams to evaluate optics, sensors, and ISP interactions virtually, long before hardware exists.
By balancing hardware behavior with digital corrections, ImSym helps organizations reduce risk, increase design flexibility, and accelerate time‑to‑market. From early feasibility analysis to manufacturing test preparation, ImSym enables a more efficient, integrated, and confident imaging development process.
Explore how ImSym can enhance your imaging system development.
👉 Contact us at https://www.keysight.com/us/en/contact/optical-solutions.html to request a demo or start an evaluation.