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10 changes: 7 additions & 3 deletions docs/library/omv.image.rst
Original file line number Diff line number Diff line change
Expand Up @@ -1656,7 +1656,7 @@ Methods

Only for grayscale images.

.. method:: image.find_keypoints(roi=Auto, threshold=20, scale_factor=1.5, max_keypoints=100, corner_detector=CORNER_AGAST)
.. method:: image.find_keypoints(roi=Auto, threshold=20, normalized=False, scale_factor=1.5, max_keypoints=100, corner_detector=CORNER_AGAST)

Extracts ORB keypoints from the region-of-interest (x, y, w, h) tuple. You
can then use then use the ``image.match_descriptor`` function to compare
Expand All @@ -1668,6 +1668,10 @@ Methods
around 20. FOr the FAST corner detector this should be around 60-80. The
lower the threshold the more extracted corners you get.

``normalized`` is a boolean value that if True turns off extracting
keypoints at multiple resolutions. Set this to true if you don't care
about dealing with scaling issues and want the algorithm to run faster.

``scale_factor`` is a float that must be greater than 1.0. A higher scale
factor will run faster but will have much poorer image matches. A good
value is between 1.35 and 1.5.
Expand All @@ -1684,8 +1688,8 @@ Methods

.. note::

``roi``, ``threshold``, ``scale_factor``, ``max_keypoints``, and
``corner_detector`` are keyword argument which must be explicitly
``roi``, ``threshold``, ``normalized``m ``scale_factor``, ``max_keypoints``,
and ``corner_detector`` are keyword argument which must be explicitly
invoked in the function call by writing ``roi=``, ``threshold=``, etc.

.. method:: image.find_lines(roi=Auto, threshold=50)
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