HybridBinarizer.h

00001 // -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
00002 #ifndef __HYBRIDBINARIZER_H__
00003 #define __HYBRIDBINARIZER_H__
00004 /*
00005  *  HybridBinarizer.h
00006  *  zxing
00007  *
00008  *  Copyright 2010 ZXing authors All rights reserved.
00009  *
00010  * Licensed under the Apache License, Version 2.0 (the "License");
00011  * you may not use this file except in compliance with the License.
00012  * You may obtain a copy of the License at
00013  *
00014  *      http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing, software
00017  * distributed under the License is distributed on an "AS IS" BASIS,
00018  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00019  * See the License for the specific language governing permissions and
00020  * limitations under the License.
00021  */
00022 
00023 #include <vector>
00024 #include <zxing/Binarizer.h>
00025 #include <zxing/common/GlobalHistogramBinarizer.h>
00026 #include <zxing/common/BitArray.h>
00027 #include <zxing/common/BitMatrix.h>
00028 
00029 namespace zxing {
00030     
00031     class HybridBinarizer : public GlobalHistogramBinarizer {
00032      private:
00033     Ref<BitMatrix> matrix_;
00034       Ref<BitArray> cached_row_;
00035 
00036     public:
00037         HybridBinarizer(Ref<LuminanceSource> source);
00038         virtual ~HybridBinarizer();
00039         
00040         virtual Ref<BitMatrix> getBlackMatrix();
00041         Ref<Binarizer> createBinarizer(Ref<LuminanceSource> source);
00042   private:
00043     // We'll be using one-D arrays because C++ can't dynamically allocate 2D
00044     // arrays
00045     ArrayRef<int> calculateBlackPoints(ArrayRef<char> luminances,
00046                                        int subWidth,
00047                                        int subHeight,
00048                                        int width,
00049                                        int height);
00050     void calculateThresholdForBlock(ArrayRef<char> luminances,
00051                                     int subWidth,
00052                                     int subHeight,
00053                                     int width,
00054                                     int height,
00055                                     ArrayRef<int> blackPoints,
00056                                     Ref<BitMatrix> const& matrix);
00057     void thresholdBlock(ArrayRef<char>luminances,
00058                         int xoffset,
00059                         int yoffset,
00060                         int threshold,
00061                         int stride,
00062                         Ref<BitMatrix> const& matrix);
00063     };
00064 
00065 }
00066 
00067 #endif