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Motion Blur Correction for High-Speed Thermal Imaging

Digital Infrared Image Correction and Fast Sampling Thermal Cameras for Real-time Monitoring of Fast-moving Objects

Challenge

High-speed industrial processes cause motion blur in thermal images, making temperature measurements unreliable. Fast-moving objects spread heat signatures across pixels, distorting critical details. This is problematic in applications like train axle monitoring, brake testing, and metal processing, where accurate temperature data is essential for safety and quality assurance.

Solution

The application uses sequential exposure, high frame rates, and digital correction to eliminate motion blur. This enables sharp thermal imaging of fast-moving objects, ensuring precise temperature readings in real time. It enhances monitoring of dynamic systems like braking components, rolling materials, and high-speed rail infrastructure without requiring costly cooled detectors.

Benefits

  • Sharp thermal images enable accurate monitoring of high-speed mechanical components.
  • Reduces risk of undetected overheating in safety-critical systems.
  • Improves quality control by providing reliable data during fast production cycles.
  • Enables efficient fault detection, minimizing downtime and material waste.
  • Cost-effective alternative to expansive cooled cameras with lower maintenance demands.

Motion Blur Disrupts Accurate Infrared Temperature Measurement in High-Speed Processes

Many industrial applications require temperature measurements of fast-moving objects. Motion blur poses a significant challenge as it significantly affects the accuracy of measurement results. This issue is particularly problematic for microbolometer cameras, as their sensors require a certain amount of time to detect temperature changes. During the exposure time, however, the object continues to move, causing image information to spread across multiple pixels. As a result, images appear blurred, temperature readings become inaccurate, and critical details may be lost.

A typical example is monitoring high-speed trains, where axle bearings and brakes must be checked for overheating during operation. At up to 50 m/s speeds, conventional infrared cameras produce blurred thermal images, making it challenging to identify overheated components.
Similar challenges arise in other high-speed applications. In the automotive industry, measuring brake temperatures during test drives or on test stands is essential for developing safe, high-performance braking systems. Even materials such as sheet metal or foil, processed in rolling mills, sometimes move through these systems at high speeds! Constant and reliable temperature measurement in the form of sharp thermal images is necessary here to avoid material defects.

In all these applications, motion blur can directly impact the quality of the temperature measurements and lead to blurred thermal images.

How Infrared Cameras Eliminate Motion Blur for Sharper Infrared Imaging

The Optris PI series thermal cameras provide a specially optimized solution for high-speed measurements. The PI 450i and PI 640i models are designed to minimize motion blur through high frame rates, precise exposure control, and digital image correction. The PI 450i features an optical resolution of 382 x 288 pixels and achieves a frame rate of up to 80 Hz. The PI 640i offers VGA resolution of 640 x 480 pixels and can reach frame rates of up to 125 Hz in subframe mode. These high frame rates are essential for capturing temperature variations of moving objects.

A key component for reducing motion blur is sequential exposure, where a high-speed mechanical shutter is synchronized with the camera. This technique ensures that the sensor is exposed only for an extremely short period, minimizing motion within a single frame. The principle is similar to using a flash in photography: instead of continuously capturing the image, only a brief moment of movement is recorded, resulting in much sharper thermal data. The combination of high frame rates and optimized exposure ensures that even fast-moving objects are captured with great clarity.

Additionally, digital correction methods are applied to eliminate residual blurring. The Wiener filter analyzes movement direction and reconstructs image information by correcting blurred pixels. This results in sharper thermal images with significantly improved accuracy compared to conventional infrared imaging without motion blur correction.
Field tests have proven the effectiveness of the Optris PI series technology in high-speed train monitoring. Even at speeds of 50 m/s, the cameras delivered precise and sharp thermal images, enabling reliable monitoring of axle bearings and braking systems. The technology has also been successfully tested under real-world conditions in automotive development, where it captured the heat distribution on brake discs during dynamic braking maneuvers. In metal processing, the Optris PI series significantly improved temperature measurements of high-speed metal strips in rolling mills.

Enhanced Industrial Safety with Fast Infrared Imaging of Fast Moving Parts

The Optris PI series thermal cameras enable significantly more precise temperature measurements in high-speed processes thanks to Motion Blur Image Correction. The combination of high frame rates, sequential exposure, and digital image correction ensures that no critical image information is lost even at high speeds. This leads to improved data quality and more reliable fault detection.

Another advantage is the ease of integration into existing systems. With versatile interfaces such as USB 2.0 and Gigabit Ethernet (PoE), the optris PI cameras can be seamlessly incorporated into industrial process monitoring systems. The optional industrial process interface (PIF) allows real-time camera control, making integrating temperature measurements into existing automation systems easy. The cameras’ robust design, featuring IP67-certified housings, ensures reliable operation even in harsh environments, whether in dusty rolling mills, high-speed rail networks, or the extreme heat of forging processes.

The innovative technology of the Optris PI infrared imagers eliminates the need for expensive, cooled infrared cameras with quantum detectors. While such systems often come with high operational and maintenance costs, the uncooled microbolometer detectors in the Optris PI series offer a cost-effective alternative with high precision and long-term reliability.
Whether in railway monitoring, automotive development, metal processing, or other high-speed applications, the Optris PI series provides a powerful infrared temperature measurement solution that delivers reliable results even under extreme conditions. Companies benefit from improved process control, increased safety, and reduced maintenance costs. By implementing Motion Blur Image Correction, Optris sets new standards for high-speed infrared measurements, enabling more precise monitoring of dynamic processes than ever before.

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