Mathematica 9 is now available
Wolfram Mathematica Documentation Center
DOCUMENTATION CENTER SEARCH
Function Index /
Previous section-----Next section

BlockProcessing

BlockProcessing will return a result of the same dimensions as img if function f returns a scalar.
If img is an ImageData expression, BlockProcessing will return an ImageData object only if the operation f returns a raw data structure that is ImageData compatible (see Equations (2.2.1), ( 2.3.1), (2.3.2)).
The option PaddingMethod may be used to select the type of border extension used during calculation. Default setting is PaddingMethod→FixedPad. Any of the supported padding methods may be used (ConstantPad, FixedPad, PeriodicPad, ReflectPad, ZeroPad). The setting PaddingMethod→None may be used to compute the result without extending the border.
The option Centered may be used to extend the border symmetrically or only at the end of a list. Default setting is Centered→False.
The argument img may be an array or ImageData expression.
See also User's Guide 5.4.
Modified in Version 2.

Examples

This loads the package.
In[1]:=
Here are some simple usage examples.
In[2]:=
This wraps function f around each 2 × 2 block of array tmp.
In[3]:=
Out[3]//MatrixForm=Out[3]//MatrixForm=
This is an example of block processing with a sliding window.
In[4]:=
Out[4]//MatrixForm=Out[4]//MatrixForm=
This disables border extension.
In[5]:=
Out[5]//MatrixForm=Out[5]//MatrixForm=
Here we make function f return its argument by using the pure function #&.
In[6]:=
Out[6]//MatrixForm=Out[6]//MatrixForm=
This joins the elements of all the submatrices.
In[7]:=
Out[7]//MatrixForm=Out[7]//MatrixForm=
Here we use BlockProcessing to return the variance within 8×8 partially overlapping blocks in an example image.
In[8]:=
This shows the result.
In[9]:=
Out[9]=Out[9]=


Any questions about topics on this page? Click here to get an individual response.Buy NowMore Information
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT.