Blob Region

## Blob Region

Extract regions in the image whose gray scale meets the set threshold. This region can be output as a mask for other modules to reference. You can set screening conditions for screening, and you can also perform morphological operations on the region, and finally set the sorting method so that the regions are output in a certain sorting order

## Usage Scenarios
Screen blob regions that meet the conditions and use them as masks for other modules.

### Usage Example
Treat regions within a certain range around the circle as mask output for other modules to use as masks.
![](/media/202602/2026-02-06_114907_0067700.06774806844686232.png)

![](/media/202602/2026-02-06_115041_0222020.16737213338972168.png)
## Parameter Configuration Description
### Interface Parameters
Gray Threshold: Gray value setting of gray image, regions meeting this interval are selected.
Total Count Judgment: Judgment of the final region result, if the number of regions is within this interval, the result is true, otherwise it is false.
Total Area Judgment: Judgment of the final region result, if the total area of all regions is within this interval, the result is true, otherwise it is false.
The logical relationship between Total Count Judgment and Total Area Judgment is "AND", if one is false, the output result is false.
Size Conversion: If enabled, convert the detected region size from pixel size to world coordinate size.
Learn Coordinate System: Learn the position of the first region.

![](/media/202602/2026-02-06_115108_8409840.434961139411594.png)

### Processing
Perform morphological transformation and region processing on detected regions.
![](/media/202602/2026-02-06_115138_3627520.5747249344613042.png)

### Advanced Parameters
Sort the detected region results, sorting can be ascending or descending according to area size, x, y coordinates.
![](/media/202602/2026-02-05_175959_7000070.7912503162104289.png)

![](/media/202602/2026-02-05_180008_0949070.012331619402523364.png)

### Screening Parameters
After the interface parameters give the threshold, all image regions meeting the threshold will be found. At this time, some regions can be filtered out according to some conditions, such as single area, center of gravity x, center of gravity y, center coordinate x/y of bounding rotated/upright rectangle, length and width of bounding rotated/upright rectangle, hole area, hole count, rectangularity, circularity, compactness, removing border regions, etc.

![](/media/202602/2026-02-05_180433_8108640.7076170386744366.png)

![](/media/202602/2026-02-05_180444_0015260.5135247309631629.png)

In order to facilitate setting parameter size, there is a blob info button next to it. Click to view the feature information of the detected blob regions. You can slide the horizontal scroll bar to view all features.

![](/media/202602/2026-02-05_180559_6676000.623175257591416.png)
## Output Description
Running Result: Detection success outputs True, failure outputs False.
Mask Count: Number of blob regions.
Mask Total Area: Total area of detected blob regions.
Mask Region: Detected blob region output, can be introduced as mask by other modules.
Rotated Rectangle ROI: ROI output used by the module itself.
Center of Gravity Array: Center of gravity of detected blob regions, output as an array.
Rotated Rectangle Array: Array of minimum bounding rotated rectangles (center, width height, angle) of detected blob regions.
Regular Rectangle Array: Array of minimum bounding regular rectangles (top-left coordinate, width height) of detected blob regions.
Output Coordinate System: Learned coordinate system output.

![](/media/202602/2026-02-06_115339_8320920.3928642418298919.png)

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Click here to jump to the corresponding Chinese manual page: [Blob Region](/doc/64)