binarizr.go

package gozxing

type Binarizer interface {
	GetLuminanceSource() LuminanceSource

	/**
	 * 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.
	 *
	 * @param y The row to fetch, which must be in [0, bitmap height)
	 * @param 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.
	 * @return The array of bits for this row (true means black).
	 * @throws NotFoundException if row can't be binarized
	 */
	GetBlackRow(y int, row *BitArray) (*BitArray, error)

	/**
	 * 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.
	 *
	 * @return The 2D array of bits for the image (true means black).
	 * @throws NotFoundException if image can't be binarized to make a matrix
	 */
	GetBlackMatrix() (*BitMatrix, error)

	/**
	 * 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.
	 *
	 * @param source The LuminanceSource this Binarizer will operate on.
	 * @return A new concrete Binarizer implementation object.
	 */
	CreateBinarizer(source LuminanceSource) Binarizer

	GetWidth() int
	GetHeight() int
}