MV Blob Finder DirectShow Filter
The MV Blob Counter filter find a specific blob (object or
contour) within an image. The filter contains two filters for
blobs. One filter excludes all blobs outside a minimum
and maximum size. The second filter excludes all blobs whose
seven hu invariants are outside a minimum and maximum value.
Hu invariants are proved to be invariants to the image scale,
rotation, and reflection except the seventh one, whose sign is
changed by reflection. If more than one blob is found within the
image the filter use the largest blob.
The MV Blob Finder filter calculates some blob characteristics
like angle, perimeter, area, minimum bounding rect, upright
bounding rect, spatial and central moments and hu invariants.
Additionally the filter calculates the convex hull for the blob and
reduce contour complexity with an approximation algorithm. Use
these two options to optimise the blob finding function.
| File: |
blobfinder.ax |
| CLSID: |
CLSID_MVBlobFinder |
Supported Interfaces
IMVBlobFinder
IMVBlobFinder2
IMVBlobFinder3
|