In this article, Patrick Schick, Product Manager for 3D Vision at IDS, explains the background and technical decisions behind Nion, puts iToF technology into context, and highlights typical areas of application.
Time-of-Flight as a key technology for cost-sensitive 3D applications
Patrick Schick, Product Manager for 3D Vision | IDS Imaging
Nion is the first 3D camera developed in-house by IDS and is designed to provide a cost-effective entry point into 3D data acquisition. It thus complements existing solutions in the high-precision segment, such as Ensenso stereo vision cameras. The depth sensor from onsemi uses indirect time-of-flight technology, provides high-resolution depth data and operates reliably even in changing light conditions, both indoors and outdoors. This makes Nion particularly suitable for industrial applications that require robust depth data without the complexity of traditional high-end 3D systems. In this article, Patrick Schick, Product Manager for 3D Vision at IDS, explains the background and technical decisions behind Nion, puts iToF technology into context, and highlights typical areas of application.
IDS enters the iToF 3D sector with Nion
IDS has been a player in the 3D sector for many years with its Ensenso Stereovision cameras. Nion is expanding this portfolio with its own entry-level Time-of-Flight camera.
Patrick Schick: “With the Nion, we are deliberately entering a new market segment. Ensenso remains our solution when the highest data quality and depth accuracy are required. Nion is designed for applications that require stable depth data but do not need the full precision of complex 3D measurement systems. The camera rounds out the range in the lower price segment and offers an option for users who want to use 3D in a practical and versatile way.”
The role of iToF technology in 3D image processing
Indirect ToF sensors (iToF) determine distances by measuring the phase shift between modulated emitted light and reflected light. This method offers greater accuracy and resolution than many direct ToF approaches, in which the transit time of the light pulse is measured. iToF sensors are frequently used in industrial automation, robotics and 3D scanning.
Patrick Schick: “For us, iToF is a logical addition to our 3D portfolio. The technology offers high spatial resolution and performs reliably even when in motion. It enables depth information to be generated in real time without the need for complex calculations outside the sensor. That is exactly what many industrial applications need: reliable depth data that is easy to use.”
Nion relies on a modern iToF sensor with integrated depth acquisition
The onsemi AF0130 sensor from the Hyperlux series used in this system offers 1.2-megapixel XY resolution and, thanks to modulation frequencies of up to 200 MHz, also provides high depth resolution. Furthermore, the sensor captures the four phase images required for iToF within the sensor before they are all read out together.
Patrick Schick: “We chose the Hyperlux sensor because it meets several requirements at once. With a resolution of 1280 × 960 pixels, it delivers four times the data density of standard VGA ToF cameras, processes depth information directly within the sensor and effectively suppresses ambient light. The wide range of modulation frequencies makes it possible to cover different distances, from close range to longer working distances. This means we can offer a camera that delivers reliable results in a wide range of situations.”
Motion-stable depth estimation in dynamic scenes
A key feature of the Nion is its low motion blur. This is particularly important for logistics, conveyor technology or applications involving rotating parts. This is because motion blur leads to unstable depth values.
Patrick Schick: “To obtain depth information, iToF sensors require multiple phase images of the same scene. In many ToF cameras, these phase images are exposed one after the other and read out from the sensor individually. Time passes between these exposures. If the object moves in the meantime, the phase images will no longer match exactly. The camera calculates depth from image data that no longer aligns. This results in unsharpness throughout the depth range. In the Nion’s onsemi Hyperlux sensor, all phase images are buffered within the sensor before being read out in a single block. As a result, the exposures run almost without interruption. This ensures that the images remain aligned and the depth values remain stable, even when objects move quickly across the image.”
Stable in changing light: For indoor and outdoor use
Nion is designed for both indoor and outdoor use. This is based on the high spectral sensitivity of the iToF sensor used in the 940 nm range, combined with the appropriate laser light in the same wavelength range.
Patrick Schick: “Nion operates in the 940 nm range and is therefore significantly less sensitive to sunlight and many artificial light sources, which predominantly operate in other wavelength ranges. This is important for logistics centers, production halls or outdoor areas. Users do not need to install complex shields or enclosures in order to obtain usable data. In these scenarios, the camera produces stable depth images that can be analyzed immediately.”
Typical applications for Nion
Nion is suitable for a wide range of industrial applications. The camera provides depth information in scenes featuring varying distances, object sizes and movements. It operates as an all-round ToF system and is therefore suitable for any environment where flexible and robust 3D scanning is required.
Patrick Schick: “Logistics is a major issue. The aim here is to detect, track or measure objects without interrupting operations. The camera detects parcels and other goods regardless of their size or distance, and also operates reliably whilst in motion. Applications such as level monitoring or presence detection are also of interest. In many cases, existing 2D processes can be retained and supplemented with depth data where necessary, if this aids decision-making within the process.”
Easy integration into existing systems
For industrial use, integration into existing software environments is crucial. Nion is GigE Vision-compliant and fully integrated into the IDS software environments.
Patrick Schick: “We wanted a 3D camera that could be used just like a standard industrial camera. Nion complies with the GigE Vision standards and is fully integrated into our IDS peak Software. This means that users do not need any specialized, niche solutions, but can integrate the camera into existing tools and applications with minimal effort. Furthermore, like any other IDS 2D vision camera, the Nion is fully integrated into the IDS peak cockpit. This significantly reduces the effort involved in getting started with 3D.”
Distinction from high-precision 3D technologies
There are various 3D solutions available on the market, including active stereovision systems such as Ensenso, which offer the highest level of precision. However, Nion is designed for other applications.
Patrick Schick: “High-precision 3D technologies such as Active Stereovision are the right choice when it comes to the finest details, maximum depth accuracy and complex measurement tasks. Nion is positioned differently. The camera is designed to deliver robust depth data at an attractive price point, with a clear focus on ease of use and integration. It does not replace high-end 3D systems, but rather complements the range of options when applications require reliable, though not highly precise, depth information.”
Further development of the 3D product range
Nion is designed to be the first component in a new 3D family. IDS is planning to expand in various directions.
Patrick Schick: “We deliberately took our time with the launch of the Nion, testing prototypes and gathering plenty of feedback. This experience is also incorporated into other models. Variants with a wider field of view, multi-camera capabilities or additional features are conceivable. The aim is to create a 3D product range that meets all requirements and offers our customers the right solutions for their needs.”
The content & opinions in this article are the author’s and do not necessarily represent the views of RoboticsTomorrow
IDS Imaging Development Systems Inc.
World-class image processing and industrial cameras "Made in Germany". Machine vision systems from IDS are powerful and easy to use. IDS is a leading provider of area scan cameras with USB and GigE interfaces, 3D industrial cameras and industrial cameras with artificial intelligence. Industrial monitoring cameras with streaming and event recording complete the portfolio. One of IDS's key strengths is customized solutions. An experienced project team of hardware and software developers makes almost anything technically possible to meet individual specifications - from custom design and PCB electronics to specific connector configurations. Whether in an industrial or non-industrial setting: IDS cameras and sensors assist companies worldwide in optimizing processes, ensuring quality, driving research, conserving raw materials, and serving people. They provide reliability, efficiency and flexibility for your application.
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