The Anomaly Detector module is the unsupervised deep-learning method available,where detailed annotations are not required and the end-user is only required to assign the OK
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The input for training involves classifying at least 1 image as an ‘OK’
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There are 3 options to perform this classification:
1. [CLICKING] - When the image is selected, click on the option ‘OK’,
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2. [NUMPAD] - When the image is selected, press numpad key ‘1’, it then categorizes it as an 'OK'
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3. [SMART SORTING] - Click on the ‘SMART SORTING’ button, and type what’s the prefix for the OK
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Tip: It is also possible to select multiple images at once using the ‘Shift’ key and classify them in bulk, by selecting the first image, then holding 'Shift' and selecting the last image from the range. |
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Attention: For 3. [SMART SORTING], please note that if the filename standard is, for instance, ‘testpart_OK52’, you would have to type ‘testpart_OK' - if you type only ‘OK’ as part of the name it won’t classify, as it classifies literally by prefix. Another approach is to check the Regex checkbox which allows you to write regular expressions instead of prefixes - then if you write only ‘OK’ it matches all images which contain ‘OK’ anywhere in their name. |
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Assigning at least 1 image as ‘OK’ already enables you to Start Training, but we usually recommend using at least 20% of OK images for optimal results, depending on the surface variability. |
Type - Lightweight
Lightweight is the first type of Anomaly Detector, which uses a viewfinder size parameter, and its number of training epochs is set in the training settings. It offers faster inference than the Standard type.
View-finder
Feature size (TODO)
The view-finder size should be determined depending on how detailed the inspection model should be.
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The view-finder size, ideally, should be slightly larger than the largest defect.
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be slightly larger than the largest defect
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Detection Area
A blue rectangle is displayed on the image when in the Training tab.
Defects are only being detected in the area inside this rectangle, due to the way the algorithm works.
As a reference, the more the view-finder size increases, the less the software can inspect the edges of the image.
Types of training
Fast Training
Fast training is a type of training with a minimum number of training cycles.
At first, we recommend running different models in Fast Training mode, using different sizes of view-finder and training parameters (brightness resistance, resistance to deviation, etc.) to find out what combination works best in your case.
Deep Training
When you find suitable settings but want to achieve even more precise results, you should try Deep Training with more training cycles.
However, you should use the same settings as the best Fast Training model result, to compare them properly.
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Type - Standard
Standard is the second type of Anomaly Detector. It doesn’t use the viewfinder size parameter, because it can search for features of different sizes at once. Can offer more precise results, but the inference time is longer than with the Lightweight type.
Detection Results - Heatmap
The result of the detection is a heatmap. When validating, heatmaps are plotted in the image for better illustration. In the heatmaps, the The heatmap detected areas that are surrounded defective can be highlighted by rectangles that . These rectangles are added to the ‘detectedRectangles’ detectedRectangles item in the context Context.
Automatic sensitivity
This function helps you set the correct threshold, a value separating OK and NG
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After training, the threshold is only calculated based on training images. For better separation of OK and NG
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As a result, you get a graph containing two curves. The green curve shows how many OK
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