Region Detector

The 'Minimum Size' property specifies the smallest allowable width and height for a region to be considered valid. Any blob on the candidates image that is smaller than this size (in either dimension) will be excluded from further analysis.

This property accepts unit-aware values, allowing you to specify dimensions in units such as px, in, pt, cm, mm, or %. You can set both width and height to the same value (e.g., 8px), or specify them independently (e.g., 1in, 2in).

Adjusting this property helps filter out noise and irrelevant small regions, ensuring that only meaningful areas are detected.

Example: 0.25in, 0.25in

The 'Minimum Area' property defines the smallest allowable area (width × height) for a region, specified as a unit-aware value. For example, a value of 0.25in requires a minimum area of 0.25 square inches.

Each blob that meets the 'Minimum Size' requirement must also have a total area equal to or greater than this value to be considered a valid region.

Use this property to further filter out small or insignificant blobs that may pass the size check but are not large enough overall to be relevant.

Example: 0.5in

The 'Minimum Fill Percent' property determines how solid or rectangular a region must be to qualify as a valid detection. It is expressed as a decimal value between 0 and 1 (e.g., 0.65 for 65%).

This value is used to filter blobs based on how closely they resemble a solid rectangle. A value of 1.0 (100%) requires each region to be a perfectly solid rectangle, while a value of 0 allows any arrangement of specks that meets the size and area requirements.

Increasing this value helps eliminate irregular or fragmented blobs, ensuring that only well-formed regions are detected.

Example: 0.8 (requires regions to be at least 80% filled)

Can be one of the following values:

The 'Connectivity' property determines how pixels are grouped into blobs during region detection. It controls whether pixels are considered connected if they touch at edges only (4-way connectivity) or at edges and corners (8-way connectivity).

Choosing the appropriate connectivity affects the sensitivity of blob detection. 8-way connectivity is more inclusive and may group diagonally adjacent pixels, while 4-way connectivity is stricter and may result in more, smaller blobs.

Adjust this property based on the structure of the regions you wish to detect in your images.

The 'Zone Adjustment' property allows you to expand or contract the boundaries of each detected region by a specified amount. Positive values will expand the region outward, while negative values will shrink it inward.

This property is useful for fine-tuning the detected regions to better match the actual areas of interest, compensating for over- or under-detection due to image artifacts or other factors.

The value is unit-aware and can be specified in units such as px, in, pt, etc.

Example: 2px (expands each region by 2 pixels on all sides)