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mahotas 0.9

Mahotas: Computer Vision Library

Package Documentation

Latest Version: 1.1.0

Image Processing Library for Python.

It includes a couple of algorithms implemented in C++ for speed while operating
in numpy arrays.

Notable algorithms:
 - watershed.
 - convex points calculations.
 - hit & miss. thinning.
 - Zernike & Haralick, LBP, and TAS features.
 - freeimage based numpy image loading (requires freeimage libraries to be
 - Speeded-Up Robust Features (SURF), a form of local features.
 - thresholding.
 - convolution.
 - Sobel edge detection.


This is a simple example of loading a file (called `test.jpeg`) and calling
`watershed` using above threshold regions as a seed (we use Otsu to define


    import numpy as np
    from scipy import ndimage
    import mahotas
    import pylab

    img = mahotas.imread('test.jpeg')
    T_otsu = mahotas.thresholding.otsu(img)
    seeds,_ = ndimage.label(img > T_otsu)
    labeled = mahotas.cwatershed(img.max() - img, seeds)


Recent Changes

0.8.1 (June 6 2012)
- Fix gaussian_filter bug when order argument was used (reported by John Mark
- Add morph.cerode
- Improve regmax() & regmin(). Rename previous implementations to locmax() &
- Fix erode() on non-contiguous arrays

0.8 (May 7 2012)
- Move features to submodule
- Add function
- Add morph.regmax & morph.regmin functions
- Add morph.close function
- Fix morph.dilate crash

0.7.3 (March 14 2012)
- Fix installation of test data
- Greyscale erosion & dilation
- Use imread module (if available)
- Add output argument to erode() & dilate()
- Add 14th Haralick feature (patch by MattyG) --- currently off by default
- Improved zernike interface (zernike_moments)
- Add remove_bordering to labeled
- Faster implementation of ``bwperim``
- Add ``roundness`` shape feature

0.7.2 (February 13 2012)

There were two minor additions:

- Add as_rgb (especially useful for interactive use)
- Add Gaussian filtering (from scipy.ndimage)

And a few bugfixes:

- Fix type bug in 32 bit machines (Bug report by Lech Wiktor Piotrowski)
- Fix convolve1d
- Fix rank_filter

0.7.1 (January 6 2012)

The most important change fixed compilation on Mac OS X

Other changes:

- Add convolve1d
- Check that convolution arguments have right dimensions (instead of
- Add descriptor_only argument to surf.descriptors
- Specify all function signatures on

For version **0.7 (Dec 5 2011)**:

The big change was that the *dependency on scipy was removed*. As part of this
process, the interpolate submodule was added. A few important bug fixes as

- Allow specification of centre in Zernike moment computation
- Fix Local Binary Patterns
- Remove dependency on scipy
- Add interpolate module (from scipy.ndimage)
- Add labeled_sum & labeled_sizes
- gvoronoi no longer depends on scipy
- mahotas is importable without scipy
- Fix bugs in 2D TAS (reported by Jenn Bakal)
- Support for 1-bit monochrome image loading with freeimage
- Fix GIL handling on errors (reported by Gareth McCaughan)
- Fix freeimage for 64-bit computers

For version **0.6.6 (August 8 2011)**:
- Fix fill_polygon bug (fix by joferkington)
- Fix Haralick feature 6 (fix by Rita Simões)
- Implement ``morph.get_structuring_element`` for ndim > 2. This implies that
functions such as ``label()`` now also work in multiple dimensions
- Add median filter & ``rank_filter`` functions
- Add template_match function
- Refactor by use of mahotas.internal
- Better error message for when the compiled modules cannot be loaded
- Update contact email. All docs in numpydoc format now.

For version **0.6.5**:
- Add ``max_points`` & ``descriptor_only`` arguments to
- Fix haralick for 3-D images (bug report by Rita Simões)
- Better error messages
- Fix hit&miss for non-boolean inputs
- Add ``label()`` function

For version **0.6.4**:

- Fix bug in ``cwatershed()`` when using return_lines=1
- Fix bug in ``cwatershed()`` when using equivalent types for image and markers
- Move tests to mahotas.tests and include them in distribution
- Include ChangeLog in distribution
- Fix compilation on the Mac OS
- Fix compilation warnings on gcc

For version **0.6.3**:

- Improve ``mahotas.stretch()`` function
- Fix corner case in surf (when determinant was zero)
- ``threshold`` argument in
- imreadfromblob() & imsavetoblob() functions
- ``max_points`` argument for
- Add ``mahotas.labeled.borders`` function

For version **0.6.2**:

Bugfix release:

- Fix memory leak in _surf
- More robust searching for freeimage
- More functions in to retrieve intermediate results
- Improve compilation on Windows (patches by Christoph Gohlke)

For version **0.6.1**:

- Release the GIL in morphological functions
- Convolution
- just_filter option in edge.sobel()
- mahotas.labeled functions
- SURF local features

For version **0.6**:

- Improve Local Binary patterns (faster and better interface)
- Much faster erode() (10x faster)
- Faster dilate() (2x faster)
- TAS for 3D images
- Haralick for 3D images


*Website*: `

*API Docs*: `

*Mailing List*: Use the `pythonvision mailing list
<>`_ for questions, bug
submissions, etc.
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