The structure of a machine vision system includes several key components such as image detection, data acquisition, processing, display, and intelligent decision-making modules. These systems integrate various technologies like computer graphics, digital image processing, video information analysis, pattern recognition, artificial intelligence, and VLSI technology. They are widely used in fields such as industrial product inspection, aerospace, remote sensing, medical imaging, transportation, and more, where image acquisition, processing, and decision-making are essential. Figure 1 shows a block diagram of a typical machine vision system.
An embedded image acquisition and processing system is an essential part of modern machine vision setups. NetSighTII is a powerful and flexible embedded solution that allows for quick integration into production lines. It offers a cost-effective alternative to traditional PC-based or smart camera systems, helping to improve the efficiency and accuracy of quality control processes. As shown in Figure 2, NetSighTII is designed for seamless operation in real-world environments.
NetSighTII features a high-performance processor, multiple camera interfaces, and versatile communication options. By simply connecting a camera and installing the appropriate software, users can quickly test products on the production line, significantly reducing setup and configuration time. This makes it ideal for applications requiring fast deployment and reliable performance.
One of the main limitations of using multiple SmartCameras is the complexity and reliability issues that arise when integrating them. NetSighTII overcomes this by supporting up to four cameras simultaneously, allowing users to select the best camera for each specific application. It supports most standard analog cameras and can also connect non-standard ones through adapters, offering greater flexibility in system design.
Sherlock, the built-in machine vision inspection software, is a powerful tool that simplifies the development of automated inspection systems. With thousands of users worldwide, Sherlock is known for its ease of use, quick template creation, and support for custom algorithms. Although it currently does not support color camera input, it provides robust tools for image analysis, measurement, and pattern recognition.
Key technical specifications of the NetSighTII system include three monochrome or one RGB analog camera inputs, a 15-pin D-Sub connector, and support for resolutions up to 2K x 2K pixels. The system has 256MB of program memory and 20GB of data storage, along with digital I/O ports for control and monitoring. Its powerful embedded processor ensures fast and accurate image processing, making it suitable for high-speed inspection tasks.
The external interfaces of NetSighTII include VGA output, USB and PS/2 ports, an Ethernet connection, and multiple camera input ports. It supports both monochrome and RGB cameras, with dedicated interfaces for different types of cameras. The system also includes serial and parallel ports, as well as an audio interface for alarms. These features make it highly adaptable to various industrial applications.
Choosing the right camera is crucial for effective machine vision. The camera's resolution and field of view determine the system’s ability to detect small details. Proper lighting and lens selection are equally important, as they directly impact image quality. For example, detecting fine cracks in a large image requires a high-resolution camera capable of capturing minute details.
Machine vision cameras come in various types, with many still using analog monochrome technology. However, modern cameras often feature progressive scanning, which improves their ability to capture moving objects. The choice of light source and lens should be carefully considered, as they play a significant role in the overall performance of the system.
Sherlock, the machine vision development software, is user-friendly and ideal for creating custom vision applications. It comes in two versions—SherlockEssential and SherlockProfessional—each tailored to different levels of complexity. SherlockEssential is perfect for basic tasks like barcode reading, while SherlockProfessional offers advanced tools for multi-camera inspections and complex image processing.
With a consistent graphical interface, Sherlock allows users to create custom operator panels without writing code. It supports a wide range of image processing functions, including edge detection, shape analysis, and geometric measurements. The software also enables calibration, image transformation, and signal control, making it a comprehensive tool for building efficient vision systems.
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