Low-Latency Endoscopic Camera System on NXP i.MX8M Plus

Precision imaging, zero delays.

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Project Overview

Our company, an embedded product design services provider, was engaged by a client to develop an advanced endoscopic camera system for minimally invasive surgeries. The client required ultra-low latency (<50 ms) for real-time surgical preview, high-resolution 4K imaging at 30 fps, and reliable operation within the constraints of the human body. The solution was engineered on the NXP i.MX8M Plus System-on-Module (SoM), powered by a custom embedded Linux distribution. This case study outlines the client’s challenges, our engineering approach, deep technical implementations, and the measurement techniques used to meet stringent medical requirements:

Ultra-Low Surgical Latency

The client required sub-50 ms glass-to-glass latency for real-time surgical preview with zero perceptible delay.

High-Fidelity 4K Imaging

Needed stable 4K@30 fps output, accurate color reproduction, and smooth performance for medical-grade visualization.

Medical-Safe, Thermally Stable Design

The device had to operate safely in sealed, sterilizable enclosures, meeting ISO 10993 and IEC 60601-1-2 standards with no active cooling.

Business Challenges

Developing surgical imaging involved overcoming client-critical challenges around latency, temperature, and medical compliance. Delivering 4K video, high clinical standards, and real-time imaging within compact hardware pushed the limits of the client’s required performance.

Low-Latency Surgical Imaging

The customer faced difficulty achieving <50 ms end-to-end latency while handling high-bandwidth 4K video over MIPI CSI-2.

4K Stability Under Heavy Load

Ensuring zero frame drops and maintaining stable 4K@30 fps performance under real-time constraints was a major challenge.

Thermal & Compliance Constraints

Building a compact, sterilizable device required strict thermal limits, while meeting medical compliance added design complexity.

Pipeline & Driver Limitations

Linux defaults introduced buffering delays; the customer needed deterministic behavior through V4L2, DMA, and PREEMPT_RT optimizations.

Silicon Signals’ Solution

Silicon Signals helped the customer construct a compliant, low-latency 4K endoscopic imaging systems.

Real-Time OS Tuning

Linux 5.15 + PREEMPT_RT, scheduler tuning, CPU affinity for video threads.

Driver Optimization

Reduced V4L2 buffering, prioritized CSI-2 interrupts, DMA zero-copy paths.

Pipeline Acceleration

GStreamer with GPU-assisted color conversion (imxvideoconvert_g2d → kmssink).

Thermal Design

Passive copper heat spreader, CPUFreq scaling, software thermal monitoring.

Image Processing

ISP tuning for low-light noise reduction, GPU-based sharpening.

Compliance

Full testing to ISO 10993, IEC 60601-1-2, and IEC 62304.

Engineering Facts That Matter

Silicon Signals thrive on engineering excellence, converting ambitious ideas into reliable, real-world solutions.

End-to-End Latency
0 ms
Stability With Zero Drops
4K@ 0 fps
Passive Thermal Operation
< 0 °C

Let’s build the right medical imaging solution for your business.

Built for Compliance. Built for Performance.

Tech Stack

Hardware

NXP i.MX8M Plus, ON Semi AR1335 camera, HDMI display output.

Languages

C, C++, GStreamer pipeline scripting.

OS

Yocto-based Linux 5.15 with PREEMPT_RT.

Tools

cyclictest, ftrace, v4l2-ctl, GStreamer latency tracer, lm-sensors.

Proven Outcomes

The initiative delivered measurable improvements in real-time imaging, stability, and medical-grade compliance for the client.

Latency

Total system latency achieved 45 ms, staying well below the 50 ms requirement.

Performance

Smooth 4K video at 30 fps with zero frame drops for stable operation.

Thermal

Continuous operation maintained under 70 °C without needing active cooling.

Compliance

Successfully passed all required medical compliance and safety tests.

Let’s build smarter, safer medical imaging systems together

If you're ready to create a high-precision, ultra-low-latency endoscopic imaging solution, this case study shows what’s possible when engineering excellence meets medical-grade innovation.

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