Hardware manual

Blob Filter Impact Reference Guide
Datalogic Automation Inc. 3-96
Border Blobs
Border blobs are those blobs that touch the ROI.
Filled Blobs
Filled values are calculated using the entire inside of a blob, including nested blobs. A nested blob is entirely
contained inside another blob.
Oblongness
Oblongness is the relationship of the blob’s area to its perimeter squared. A perfect circle has a value of
approximately 12.5 (4 times pi) with the value increasing as the blob becomes more oblong. This value can
be calculated faster than convexity.
Convexity
Convexity is determined by calculating the area of a convex hull drawn around the blob, then dividing that
value by the area of the blob. This value increases if there are any concavities in the blob's perimeter.
Enable Filled Con-
vexity Filter
When checked, filters blobs within Filled Convexity Range
Filled Convexity
Range
Blob minimum and maximum Filled Convexity
Enable Filled Major
Length Filter
When checked, filters blobs within Filled Major Length Range (see
“Major Length” on page 3-97)
Filled Major Length
Range
Blob minimum and maximum Filled Major Length
Enable Filled Minor
Length Filter
When checked, filters blobs within Filled Minor Length Range (see
“Minor Length” on page 3-97)
Filled Minor Length
Range
Blob minimum and maximum Filled Minor Length
Enable Filled Major
Minor Ratio Filter
When checked, filters blobs within Filled Major Minor Ratio Range
Filled Major Minor
Ratio Range
Blob minimum and maximum Filled Major Minor Ratio
Rect List Range The list of rectangles to process
Enable Filled
Perimeter Filter
When checked, filters blobs within Filled Perimeter Range
Filled Perimeter
Range
Blob minimum and maximum Filled Perimeter
Output Name What it is
Filtered Blob List List of filtered blobs, based on input settings
Input Name What it is