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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 sp |d ur|| _ ng | _ d | _|d urlddgdgddgdgddgg d�d�}||vrbtd | d
��|| | _ d S ) N�1:(... ... ...)->0z4:(00. 01. ...)->1z4:(... .0. .1.)->1z4:(... .0. ..1)->1z4:(... .1. .0.)->0z4:(... .1. ..0)->0)r
z4:(.0. .1. ...)->1z4:(01. .1. ...)->1)ZcornerZ dilation4Z dilation8Zerosion4Zerosion8ZedgezUnknown pattern �!)�patterns�lut� Exception)�selfr �op_nameZknown_patterns� r �2/usr/lib/python3.9/site-packages/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. ddg�d� t � �fdd�tt�D ��| _d S )Nr r � c 3 s | ]}�|� @ d k V qdS )r Nr )�.0�i��mZsymbolsr r � <genexpr>^ � z/LutBuilder.build_default_lut.<locals>.<genexpr>)� bytearray�range�LUT_SIZEr �r r r r �build_default_lut[ s z LutBuilder.build_default_lutc C s | j S r �r r$ r r r �get_lut` s zLutBuilder.get_lutc s d� � fdd�|D ��S )z�string_permute takes a pattern and a permutation and returns the
string permuted according to the permutation list.
� c 3 s | ]}� | V qd S r r )r �p��patternr r r h r z-LutBuilder._string_permute.<locals>.<genexpr>)�join)r r+ Z permutationr r* r �_string_permutec s zLutBuilder._string_permutec C s� ||fg}d|v rJ|d d }t d�D ]"}|�| �|d d t�|f� q&d|v r�t|�}|d|� D ] \}}|�| �|t�|f� qfd|v r�t|�}|d|� D ]>\}}|�dd ��d
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�}dt|� }|�||f� q�|S ) z�pattern_permute takes a basic pattern and its result and clones
the pattern according to the modifications described in the $options
parameter. It returns a list of all cloned patterns.�4���r r r �M�N�0�Z�1)r" �appendr- �ROTATION_MATRIX�len�
MIRROR_MATRIX�replace�int) r Z
basic_pattern�optionsZ basic_resultr �resr �nr+ r r r �_pattern_permutej s$
� zLutBuilder._pattern_permutec
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q�| 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]Nr2 � r/ )r% r �re�searchr9 r �groupr: r> � enumerate�compiler" r# �binr7 �matchr )
r r r) r r; r+ �resultr Z
bitpattern�rr r r � build_lut� s,
zLutBuilder.build_lut)NN) �__name__�
__module__� __qualname__�__doc__r r r% r' r- r> rN r r r r r s #
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dS )�MorphOpz*A class for binary morphological operatorsNc C s< || _ |dur t|d��� | _ n|dur8t|d��� | _ dS )z&Create a binary morphological operatorN)r r )r r rN )r r r r r r r r � s
zMorphOp.__init__c C sZ | j du rtd��|jdkr$td��t�|j|jd�}t�t | j �|j
j |j
j �}||fS )z�Run a single morphological operation on an image
Returns a tuple of the number of changed pixels and the
morphed imageN�No operator loaded�L�Image mode must be L) r r �mode�
ValueErrorr �new�sizer �apply�bytes�im�id)r �imageZoutimage�countr r r r[ � s
z
MorphOp.applyc C s: | j du rtd��|jdkr$td��t�t| j �|jj�S )z�Get 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`.NrT rU rV ) r r rW rX r rK r\ r] r^ �r r_ r r r rK � s
z
MorphOp.matchc C s |j dkrtd��t�|jj�S )z�Get 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`.rU rV )rW rX r �
get_on_pixelsr] r^ ra r r r rb � s
zMorphOp.get_on_pixelsc C sX t |d�� }t|�� �| _W d � n1 s.0 Y t| j�tkrTd| _td��dS )z!Load an operator from an mrl file�rbNzWrong size operator file!)�openr! �readr r7 r# r �r �filename�fr r r �load_lut� s
,zMorphOp.load_lutc C sL | j du rtd��t|d�� }|�| j � W d � n1 s>0 Y dS )z Save an operator to an mrl fileNrT �wb)r r rd �writerf r r r �save_lut� s
zMorphOp.save_lutc C s
|| _ dS )z#Set the lut from an external sourceNr& )r r r r r �set_lut� s zMorphOp.set_lut)NNN) rO rP rQ rR r r[ rK rb ri rl rm r r r r rS � s
rS ) rE r( r r r# r6 r8 r rS r r r r �<module> s