In manufacturing, video measurement is a process that uses sensors and high-powered optical devices in video-measuring machines to capture visual information about automotive, aeronautical, medical, or electronic components. These products are typically manufactured according to precise specifications, and measuring them carefully ensures a high level of quality control.
Video measuring machines also have many complementary applications, including inspection, decision support, and certification. Manufacturers can apply optical metrology, which may involve video verification and image quality assessment, to detect product flaws. The goal of using a video measurement machine is to learn if a measured characteristic, like the dimension of an arc or an edge, meets a preset target value based on a statistical analysis. In some cases, perceptual metrics are used to assess characteristics like brightness, contrast, hue, and saturation. Whatever technique is applied, if the measurement fails to meet the target specification, a specialist may need to pull the product and troubleshoot the manufacturing process.
Video Measuring Machines in Action
Measuring the characteristics of a video measuring machine’s output typically involves:
Image Capture
Metrological videography uses a specialized 3-D video camera to capture black-and-white or color images of an object at over 50 frames per second (fps).
Image Decomposition
After capture, software is used to decompose the video into more manageable and useful images.
Image Segmentation
Once individual images are ready, segmentation involves splitting them into regions of interest.
Image Analysis
Using techniques like computerized edge detection, a specialist must analyze the video information to identify features and characteristics in the image, quantify and compare measured values to expected values, and extract quantitative data from images.
Performance Monitoring
As the product is being measured, a human specialist or a measuring device must monitor the product’s performance to assess and ensure quality control.
Verification
Verifying a product’s quality involves comparing its video measurement results to a set of predetermined, required specifications. The product can be verified if the measurements meet the specifications.
Using Video Measuring Machines in the Real World
In recent years, the electronic vehicle industry has been using video measurement to assess the quality of its plastic automotive components because this technology is well-suited to capturing the complex geometries of each part at scale. Video measuring machines can capture the visual characteristics of intricate and irregular shapes and apply their edge detection capabilities toward precisely analyzing a product’s features. They are capable of accurately capturing data correlated with large production runs while avoiding physical contact with individual components. This speeds up inspection and analysis and reduces the chance of measurement errors or damage to the parts. The digitally captured measurements are consistent enough to ensure that the process of generating results can be repeated automatically. Using video measurement devices can also help specialists detect defects and inconsistencies that could negatively affect product quality.
The Future of Video Measurement in Manufacturing
As the demand for precise, accurate, and touchless measurement grows, the use of video measurement systems is bound to increase. Video measurement machines can play a vital role in increasing the operational efficiency of a company’s manufacturing processes, reducing costs, and ensuring consistent, high-quality output.
Published by: Martin De Juan
