What can machine vision systems do for manufacturing? A quick guide

Today, manufacturers have the happy problem of too many machine vision systems, or machine vision inspection solutions, to choose from. But one of the biggest challenges is choosing the right one that is easy to integrate, maintain, and reliable. In this post, we will cover what machine vision systems can do for automating processes and quality assurance, as well as what to consider when choosing your provider.

What are machine vision systems?

Machine vision systems are technologies that can visually scan information and handle different scenarios. Based on the usage, the features and options can vary widely. For example, they can “see” things such as a fire in a forest to sound an alarm, but also use infrared light to detect invisible features to the human eye, as well as conduct quality control inspections. 

Choosing the right machine vision system is not about having a solution that can “do everything”, but instead having one that can reliably do the task you assign to it. 

What can machine vision automate for businesses?

Machine vision providers systems typically break down their services into Guidance, Identification, Gauging, and Inspection (GIGI). In other words, they can help you track and count, measure, and do quality checks. Below are the common use cases for machine vision in manufacturing:

• Counting and detection

• Barcode reading

• Quality assurance and defect detection

• Measuring and gauging

• Locating, positioning, and guiding

• OCR/OCV

Counting and detection

Machine vision systems can quickly automate inventory management and production lines by detecting the presence or absence of an object with high accuracy. This is a high-value replacement for manual inspection and mechanical counting, which is slower, decreases in reliability with human fatigue, and prone to error. Machine vision systems can be used to count items on a pallet before shipping, or verifying that all components (such as screws, seals, and labels) are present.

Barcode reading

Barcodes have been scanned to automate inventory tracking and retail counters for decades. Not only have bar code readers performed at high speed, they can read codes that are only partially visible. The introduction of AI now has image-based barcode scanners that can also diagnose the error rather than just rejecting a scan. For example, modern solutions can describe if the code is damaged, there is inadequate lighting to scan, or another factor. 

Quality assurance and defect detection

Defects can occur in any part of a manufacturing process, from problems with the quality of raw materials or parts through final inspection. Machine vision inspections at each stage can catch defects at high-volume output. The earlier the defect is detected, the higher the cost savings for the production line. Machine vision is a significant improvement over human inspection: it operates at high-volume speeds, does not lose reliability due to fatigue, and can detect even small and unexpected defects. Moreover, with AI-support, solutions such as Enao Vision can add new defect labels for continuous operational improvement.

Defect detection can vary greatly depending on the industry. It can include food products that are not fit for sale, poorly soldered boards and wires, loose seams, discolouration in fabric dyes, microscatches on glass, or distortions in pipes.

Measuring and gauging

If you have ever used the IKEA app or your smartphone’s virtual ruler, you have experienced a machine vision system used for measuring. Today, they are precise for measurement of distances, areas, diameters, and more even from different angles. In contrast, manual measurement with various tools such as gauges and calipers is inefficient and creates additional work to for comparability or consistency.

For manufacturing, measuring and gauging use cases can include ensuring the correct angle for parts, size of labels, or distances between products and products. When something doesn’t fit, an early flag system can let human operators what problem areas to focus on.

Locating, guiding, and positioning

Machine vision systems also power cobots and other machines that help with pick-and-place or assembly tasks. The AI technology, paired with appropriate cameras, helps machines to locate parts, decide if there is enough space to place an item, figure out the correct orientation of a box, as well as make micron-level precision assemblies. 

Reading text: OCR/OCV

The latest generation of AI now makes it possible for machine vision systems to read human text in milliseconds with 99.99% accuracy. This is the technology behind optical character recognition (OCR) and optical character verification (OCV) that scans documents and “reads” whole texts at a speed humans cannot. 

For production purposes, OCR can use text scanning to trigger an appropriate action, such as sorting products by sell-by dates or lot numbers. In contrast, OCV would verify if the numbers are counterfeit, the sell-by date is still valid, or the lot number is printed correctly.

How do you decide which machine vision system to start with?

If you are speaking to solutions providers to figure out what machine vision systems or inspections can do for your production line, here are some general principles that can guide your conversation. These approaches will help you navigate the many different hardware and software solutions and pricing structures, which can usually feel overwhelming and difficult to compare.

• Applicability: How does your solution work (hardware and software), and can you provide similar use-cases to what we would like to do? 

• Reliability: What is the accuracy rate, and (importantly) what conditions (setup, environment, etc.) need to be met to achieve that performance?

• Setup: How long does it take before your solution can be used on our production line? Does it require specialists to install hardware, training, or labelling of data to train your model? 

• Test: Is it possible to test your solution within the next [x] weeks with one of our teams?

• Accessibility: How easy is it for our colleagues to start using your solution (hardware, software)? Can they follow a guide or does everyone need to be trained? 

• Flexibility: Can we repurpose your solution for other steps in production? Is it easy to adapt the machine vision AI model for different materials and parts (such as from PCB defect detection to packaging inspection)?

• Maintainability: How easy it to make setting adjustments if we, for example, change products, or to troubleshoot ourselves if something goes wrong? Do you have customer support or do we need to wait for your experts to come?

• Affordability: What is your initial cost of setup, minimum units, or shortest contract? What is included in this cost, and what are additionally charged items and services?

With the availability of machine vision system providers today, we recommend speaking to different vendors to get a sense of the different applications, hardware capabilities, and software interfaces. There is no single “best” solution. For example, you may need specialised cameras that can capture images at a certain speed or beyond the visible spectrum. Or, you would need a user-friendly solution that can be reprogrammed to do automated quality inspection for different products every week. Map out your needs and take note of the answers you receive. The most convincing solution will probably be the one that you can see working live on your shopfloor.

If you would like to see how Enao Vision can provide machine vision inspection for your shopfloor, book a demo with us. You can download our iPhone app for free to start testing, and get set up within a matter of hours.