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LutBuilderaT A class for building a MorphLut from a descriptive language
The input patterns is a list of a strings sequences like these::
4:(...
.1.
111)->1
(whitespaces including linebreaks are ignored). The option 4
describes a series of symmetry operations (in this case a
4-rotation), the pattern is described by:
- . or X - Ignore
- 1 - Pixel is on
- 0 - Pixel is off
The result of the operation is described after "->" string.
The default is to return the current pixel value, which is
returned if no other match is found.
Operations:
- 4 - 4 way rotation
- N - Negate
- 1 - Dummy op for no other operation (an op must always be given)
- M - Mirroring
Example::
lb = LutBuilder(patterns = ["4:(... .1. 111)->1"])
lut = lb.build_lut()
Nc C sr |d k r|| _ ng | _ d | _|d k rnddgdgddgdgddgdddgd }||krdtd
| d || | _ d S ) Nz1:(... ... ...)->0z4:(00. 01. ...)->1z4:(... .0. .1.)->1z4:(... .0. ..1)->1z4:(... .1. .0.)->0z4:(... .1. ..0)->0z4:(.0. .1. ...)->1z4:(01. .1. ...)->1)ZcornerZ dilation4Z dilation8Zerosion4Zerosion8ZedgezUnknown pattern !)patternslut Exception)selfr op_nameZknown_patterns r //tmp/tmp5hum_rxs/lib64/python/PIL/ImageMorph.py__init__@ s
zLutBuilder.__init__c C s | j |7 _ d S )N)r )r r r r r add_patternsX s zLutBuilder.add_patternsc s. ddgd t fddttD | _d S )Nr r r c 3 s | ]}| @ d k V qdS )r Nr ).0i)msymbolsr r ^ s z/LutBuilder.build_default_lut.. ) bytearrayrangeLUT_SIZEr )r r )r r r build_default_lut[ s z LutBuilder.build_default_lutc C s | j S )N)r )r r r r get_lut` s zLutBuilder.get_lutc s( t |dkstdj fdd|D S )zstring_permute takes a pattern and a permutation and returns the
string permuted according to the permutation list.
r c 3 s | ]} | V qd S )Nr )r p)patternr r r h s z-LutBuilder._string_permute..)lenAssertionErrorjoin)r r% Z permutationr )r% r _string_permutec s zLutBuilder._string_permutec C s ||fg}d|krN|d
d }x.t dD ]"}|j| j|d d t|f q(W d|krt|}x.|d| D ] \}}|j| j|t|f qlW d|krt|}xN|d| D ]>\}}|jddjd djdd }dt| }|j||f qW |S ) zpattern_permute takes a basic pattern and its result and clones
the pattern according to the modifications described in the $options
parameter. It returns a list of all cloned patterns.4r r r MN0Z1r0 )r appendr) ROTATION_MATRIXr&
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dg| | j|< qW qW | jS )zlCompile all patterns into a morphology lut.
TBD :Build based on (file) morphlut:modify_lut
z (\w*):?\s*\((.+?)\)\s*->\s*(\d)
r# zSyntax error in pattern ""r r r r .Xz[01]Nr- r r0 )r! r researchr4 r groupr5 r9 enumeratecompiler r binr& matchr )
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zLutBuilder.build_lut)NN) __name__
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dS )MorphOpz*A class for binary morphological operatorsNc C s< || _ |dk r t|dj | _ n|dk r8t|dj | _ dS )z&Create a binary morphological operatorN)r )r )r r
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zMorphOp.__init__c C sZ | j dkrtd|jdkr$tdtj|j|jd}tjt | j |j
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j }||fS )zRun a single morphological operation on an image
Returns a tuple of the number of changed pixels and the
morphed imageNzNo operator loadedLzImage mode must be L) r r mode
ValueErrorr newsizer applybytesimid)r imageZoutimagecountr r r rS s
z
MorphOp.applyc C s: | j dkrtd|jdkr$tdtjt| j |jjS )zGet a list of coordinates matching the morphological operation on
an image.
Returns a list of tuples of (x,y) coordinates
of all matching pixels. See :ref:`coordinate-system`.NzNo operator loadedrN zImage mode must be L) r r rO rP r rE rT rU rV )r rW r r r rE s
z
MorphOp.matchc C s |j dkrtdtj|jjS )zGet a list of all turned on pixels in a binary image
Returns a list of tuples of (x,y) coordinates
of all matching pixels. See :ref:`coordinate-system`.rN zImage mode must be L)rO rP r
get_on_pixelsrU rV )r rW r r r rY s
zMorphOp.get_on_pixelsc C sD t |d}t|j | _W dQ R X t| jtkr@d| _tddS )z!Load an operator from an mrl filerbNzWrong size operator file!)openr readr r& r r )r filenamefr r r load_lut s
zMorphOp.load_lutc C s8 | j dkrtdt|d}|j| j W dQ R X dS )z Save an operator to an mrl fileNzNo operator loadedwb)r r r[ write)r r] r^ r r r save_lut s
zMorphOp.save_lutc C s
|| _ dS )z#Set the lut from an external sourceN)r )r r r r r set_lut s zMorphOp.set_lut)NNN) rI rJ rK rL r rS rE rY r_ rb rc r r r r rM s
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