Machine Vision Tools for Solving Auto ID Applications
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1 Machine Vision Tools for Solving Auto ID Applications Part 3 of a 3-part webinar series: Introduction to Machine Vision Track, Trace & Control Solutions
2 About your Instructors Dr. Jonathan Ludlow Machine Vision Product Manager Juan Worle Technical Training Coordinator
3 Today s Objectives By the end of this Webinar, you will know: Most common Machine Vision tools How you can use these tools in the most common applications
4 Today s Topics Today we will discuss: Machine Vision tools Helper Tools Combining Machine Vision tools
5 Machine Vision Tools The job of a Machine Vision tool is to extract useful information from an image. We will focus on the tools that Measure, Decode, Count and Locate: 1D and 2D decoding Optical Character Recognition (OCR) Blob Edge Intellifind
6 1D and 2D Decoding Decode tools for Data Matrix and linear barcodes: Decode tools are the same as you would find in a 2D imager Validates or reports the data within a code You must have at least 4 sensor pixels on each element Quiet zone should be 5x the narrow bar size Quiet zone should be 10% of Data Matrix size ROI: Machine Vision tool use Regions of Interest to search for features You must have at least 1 sensor pixel on the narrow bar
7 Optical Character Recognition (OCR) OCR tools can be used to read Human Readable text: Default fonts are industry standards for OCR Teach your own font for more flexibility Validate the OCR data Four examples of industry standard OCR fonts Trainable OCR tools let you learn a non-standard font
8 Optical Character Recognition (OCR) Make your OCR application reliable: OCR characters should be 25 pixels wide Each character should have a quiet zone Avoid large gaps in the character The sample on the left does not have enough spacing. The sample on the right has good spacing, even background, and good character size. We will deal with the space between the dots later.
9 Optical Character Recognition (OCR) OCR characters on a noisy background, poorly marked characters, and handwriting are examples of applications to carefully consider. Be careful of fonts with similar characters like O 0 and D Suggest improvements to make it reliable Poor print quality and text through the background will cause reliability problems. OCR algorithms for handwriting are specialized and time-consuming
10 Blob Tool: Connectivity Tool A blob is any group of pixels within a size range that are of a similar color (shade of grey) and are different than the surrounding area. Count the number of blobs Measure the size of a blob Locate the position of a blob Compare to a tolerance Measure: Ensure pills are not broken by comparing to a size tolerance Count: Verify 3 wires are installed
11 Blob Tool: Connectivity Tool When using the Blob tool, consider: Blobs are threshold-based (converted to black and white) Blobs must stand out from the background There must not be other blobs in the area that can be mistaken as the object Count: Check ball count by counting the number of blobs in pixel range Count: Look for debris by counting the number of blobs greater than 50 pixels
12 Edge Tools Edge tools scan an image for an edge: Locate an object Locate a corner Measure the distance between edges Measure the angle of an edge Compare to tolerances Close-up: Edge tools look for transitions in grayscale and fit an edge to the transitions
13 Edge Tools When searching for an edge, consider the following: Edge tools scan in one direction that is user-defined Edge tools fit a line to the transition in grayscale Search from the cleanest side to the noisy side Locate: Use two Edge tools to find the corner Measure: Two Edge tools are used to measure the fill level inside a container Two Edge tools check that a label is in the right place
14 Intellifind Microscan s powerful pattern matching tool searches for a pattern within the Field of View: Locate shapes and outlines Identify parts Learns the outline or shape to locate parts Allows for incomplete parts Angle and scale can change Locate if background changes Locate if the polarity changes
15 Intellifind When selecting a pattern to match: The pattern should be unique Use simple patterns that are easy to identify Intellifind is used to locate the position of a part and report the information to a robot for precise positioning Intellifind is used to verify the type of product cartons currently being run A similar application is sorting based on product
16 Helper Tools Tools that prepare an image for other tools are called helper tools. These tools will produce a new image that other tools will use. Two tool types that we will discuss today: Morphology Dynamic Location
17 Morphology Transforms the image to make features stand out: Use to expand, separate, merge, clean Does not extract features Erode black pixels: Create separation, then count using Blob tool Dilate white pixels: Increase Data Matrix cell size to correct for poor cell fill
18 Morphology When using Morphology to alter an image: The separation between features must be larger than the gaps being closed. Be careful that small features do not disappear when eroding Erode white: Decrease the size of white area to link up the dots, produces a more reliable OCR read
19 Dynamic Location Use a Locate tool like Intellifind to position measurement or ID tools: Allows loose fixturing or random presentation Precise tool positioning Locate and Measure: Intellifind locates the spark plug and the Blob tool is used to measure the terminal
20 Combining Machine Vision Tools Machine Vision tools can be combined together to build a complete inspection. When combining tools: Keep the application simple Remember that the image must be consistent
21 Combining tools Automotive Fuel Injector Food Packaging Read Data Matrix and OCR then validate the data. Measure the part and check for o-ring assembly. Two camera system compares lid to container using Intellifind. When they do not match, the line shuts down and warns an operator.
22 Machine Vision Tools for Auto ID Applications Conclusion The more common Machine Vision tools can be categorized into the top applications: Measure, Decode, Read, Count and Locate These tools include: 1D/2D barcodes and OCR decoding, Blob, Edge, and Intellifind Each tool has unique characteristics that can be used to make the application reliable Morphology and Dynamic Location tools will modify an image to enhance features or make them more reliable
23 Thank you! For More information Website: Online courses Spec sheets Technology Brochures Support Self-help and support request form Instructors: Juan Worle, Technical Training Coordinator Dr. Jonathan Ludlow, Machine Vision Product Manager Feedback on this webinar: Additional contacts: Additional product information: Training: Support: Graduation exercise Download Visionscape from download center
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