This class hierarchy provides a set of methods to convert luminance data to 1 bit data.
It allows the algorithm to vary polymorphically, for example allowing a very expensive
thresholding technique for servers and a fast one for mobile. It also permits the implementation
to vary, e.g. a JNI version for Android and a Java fallback version for other platforms.
Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
cached data. Callers should assume this method is expensive and call it as seldom as possible.
This method is intended for decoding 1D barcodes and may choose to apply sharpening.
For callers which only examine one row of pixels at a time, the same BitArray should be reused
and passed in with each call for performance. However it is legal to keep more than one row
at a time if needed.
y - The row to fetch, which must be in [0, bitmap height)
row - An optional preallocated array. If null or too small, it will be ignored.
If used, the Binarizer will call BitArray.clear(). Always use the returned object.
The array of bits for this row (true means black).
Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive
and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
may not apply sharpening. Therefore, a row from this matrix may not be identical to one
fetched using getBlackRow(), so don't mix and match between them.
The 2D array of bits for the image (true means black).
Creates a new object with the same type as this Binarizer implementation, but with pristine
state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
of 1 bit data. See Effective Java for why we can't use Java's clone() method.
source - The LuminanceSource this Binarizer will operate on.