6.7 Subpixel Blob
Information:
The function not available when using Smart Sensor (VSSxxxxxx.xxxx-000) required for execution. Calculated edge gradients
within pixel thus result higher resolution when using subpixels than would possible with the actual
pixels. least
one Smart Camera (VSC122xxx.xxxx-000).
A subpixel computational description the internal structure pixel opposed the pixel itself,
which physically limited figure the area element from the image sensor.Function description
7. For example, the subpixel-accurate calculation the area circle.
A blob analysis with subpixel accuracy can carried out cyclic operation based these determined
parameters that can used count blobs, generally detect positions and colors simply perform mea-
surements the blobs themselves.
Subpixel Blob makes possible teach-in blobs based the following parameters (procedure for sub-
pixel blob analysis):
• Thresholds for grayscale values (MeanGrayValue)
• Blob shape (morphology)
• Thresholds for size (AreaMin/Max) (rough reduction)
• Selection according shape and fitting
• Subpixel-accurate contour
• New area calculation
• Reduction predefined maximum number
• Calculate the geometric features.
A blob (Binary Large Object) area contiguous pixels with the same defined grayscale value range.
Vision function Subpixel Blob blob analysis function with subpixel accuracy used for detecting and
segmenting blobs image using geometric and color parameters well for extracting features from
them.
Smart Camera Smart Sensor User's manual 1.23 43
