cpp/core/src/zxing/common/HybridBinarizer.h

   1 #ifndef __HYBRIDBINARIZER_H__
   2 #define __HYBRIDBINARIZER_H__
   3 /*
   4  *  HybridBinarizer.h
   5  *  zxing
   6  *
   7  *  Copyright 2010 ZXing authors All rights reserved.
   8  *
   9  * Licensed under the Apache License, Version 2.0 (the "License");
  10  * you may not use this file except in compliance with the License.
  11  * You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21
  22 #include <vector>
  23 #include <zxing/Binarizer.h>
  24 #include <zxing/common/GlobalHistogramBinarizer.h>
  25 #include <zxing/common/BitArray.h>
  26 #include <zxing/common/BitMatrix.h>
  27
  28 namespace zxing {
  29
  30         class HybridBinarizer : public GlobalHistogramBinarizer {
  31          private:
  32     Ref<BitMatrix> cached_matrix_;
  33           Ref<BitArray> cached_row_;
  34           int cached_row_num_;
  35
  36         public:
  37                 HybridBinarizer(Ref<LuminanceSource> source);
  38                 virtual ~HybridBinarizer();
  39
  40                 virtual Ref<BitMatrix> getBlackMatrix();
  41                 Ref<Binarizer> createBinarizer(Ref<LuminanceSource> source);
  42   private:
  43     void binarizeEntireImage();
  44     // We'll be using one-D arrays because C++ can't dynamically allocate 2D arrays
  45     int* calculateBlackPoints(unsigned char* luminances, int subWidth, int subHeight,
  46       int width, int height);
  47     void calculateThresholdForBlock(unsigned char* luminances, int subWidth, int subHeight,
  48       int width, int height, int blackPoints[], Ref<BitMatrix> matrix);
  49     void threshold8x8Block(unsigned char* luminances, int xoffset, int yoffset, int threshold,
  50       int stride, Ref<BitMatrix> matrix);
  51         };
  52
  53 }
  54
  55 #endif /* GLOBALHISTOGRAMBINARIZER_H_ */