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d4efd44fb0
git-svn-id: https://zxing.googlecode.com/svn/trunk@1202 59b500cc-1b3d-0410-9834-0bbf25fbcc57
93 lines
3.9 KiB
C#
Executable file
93 lines
3.9 KiB
C#
Executable file
/*
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* Copyright 2009 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using BitArray = com.google.zxing.common.BitArray;
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using BitMatrix = com.google.zxing.common.BitMatrix;
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namespace com.google.zxing
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{
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/// <summary> This class hierarchy provides a set of methods to convert luminance data to 1 bit data.
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/// It allows the algorithm to vary polymorphically, for example allowing a very expensive
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/// thresholding technique for servers and a fast one for mobile. It also permits the implementation
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/// to vary, e.g. a JNI version for Android and a Java fallback version for other platforms.
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///
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/// </summary>
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/// <author> dswitkin@google.com (Daniel Switkin)
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/// </author>
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/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
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/// </author>
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public abstract class Binarizer
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{
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virtual public LuminanceSource LuminanceSource
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{
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get
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{
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return source;
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}
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}
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/// <summary> Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive
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/// and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
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/// may not apply sharpening. Therefore, a row from this matrix may not be identical to one
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/// fetched using getBlackRow(), so don't mix and match between them.
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///
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/// </summary>
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/// <returns> The 2D array of bits for the image (true means black).
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/// </returns>
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public abstract BitMatrix BlackMatrix{get;}
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//UPGRADE_NOTE: Final was removed from the declaration of 'source '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
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private LuminanceSource source;
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protected internal Binarizer(LuminanceSource source)
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{
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if (source == null)
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{
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throw new System.ArgumentException("Source must be non-null.");
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}
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this.source = source;
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}
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/// <summary> Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
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/// cached data. Callers should assume this method is expensive and call it as seldom as possible.
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/// This method is intended for decoding 1D barcodes and may choose to apply sharpening.
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/// For callers which only examine one row of pixels at a time, the same BitArray should be reused
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/// and passed in with each call for performance. However it is legal to keep more than one row
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/// at a time if needed.
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///
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/// </summary>
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/// <param name="y">The row to fetch, 0 <= y < bitmap height.
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/// </param>
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/// <param name="row">An optional preallocated array. If null or too small, it will be ignored.
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/// If used, the Binarizer will call BitArray.clear(). Always use the returned object.
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/// </param>
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/// <returns> The array of bits for this row (true means black).
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/// </returns>
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public abstract BitArray getBlackRow(int y, BitArray row);
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/// <summary> Creates a new object with the same type as this Binarizer implementation, but with pristine
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/// state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
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/// of 1 bit data. See Effective Java for why we can't use Java's clone() method.
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///
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/// </summary>
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/// <param name="source">The LuminanceSource this Binarizer will operate on.
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/// </param>
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/// <returns> A new concrete Binarizer implementation object.
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/// </returns>
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public abstract Binarizer createBinarizer(LuminanceSource source);
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}
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} |