Blob Analyzer for details. 6. Configure the Threshold function for the selected segmentation mode. See Con- figuring Thresholds for details. The Blob Settings Window Setting Blob Area Constraints Area constraints define the Minimum Area and Maximum Area of valid blobs. Area constraints are useful for separating potential blobs from background regions, or from other blobs having similar pixel values. All modes use Minimum Area and Maximum Area for identifying valid blobs. Selecting the Image Segmentation Mode The Blob Analyzer applies image segmentation to categorize pixels within the region of interest as blob or background.
The segmentation mode you choose depends on the nature of the images and the relationship between blob data and background data. All modes except the two HSL modes provide a graph used to specify bounds for the seg- mentation. (See Creating and Configuring Color Filters for information on HSL.) Dark Segmentation The Dark Segmentation mode is used to extract dark blobs on a light back- ground. l All pixels with values to the left of the threshold function are potential blob regions. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 405