Filter Size for X-ray Inspection: How Do Small, Medium and Large Size Filters Improve Physical Contaminant Detection?

Definition: The primary method for detecting contaminants in the XIA X-ray software is by the size of objects above a certain density. Different thresholds can be used for small, medium, and large contaminants.

Explanation: Contaminants in X-ray images appear as dense groupings of pixels amongst the various gray scales of a product image. An intuitive method to detect these objects is to use morphological filters designed to find specific-sized groupings of dark (more dense) pixels. The CASSEL Inspection XIA software offers small, medium, and large size filters for flexibility and broad detection coverage. The use of these filters is easy and fast; all the user must do is set a threshold for detection by utilizing visual feedback from an image. This threshold is unique for each of the three filters. If false rejects are encountered, the structure (i.e., the number of connected pixels and total pixels in a contaminant) of each size filter can also be adjusted to ensure that a full range of contaminants can be easily and reliably detected.

Benefits: Morphological filters provide a simple yet effective way to customize your setup. Adjusting thresholds improves accuracy by increasing the system’s ability to distinguish contaminants from product variations, increasing sensitivity, and reducing false reject rates.

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