/*
 * Copyright 2012 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "ZXBinarizer.h"

@class ZXBitArray, ZXBitMatrix, ZXLuminanceSource;

/**
 * This Binarizer implementation uses the old ZXing global histogram approach. It is suitable
 * for low-end mobile devices which don't have enough CPU or memory to use a local thresholding
 * algorithm. However, because it picks a global black point, it cannot handle difficult shadows
 * and gradients.
 *
 * Faster mobile devices and all desktop applications should probably use ZXHybridBinarizer instead.
 */
@interface ZXGlobalHistogramBinarizer : ZXBinarizer

// Applies simple sharpening to the row data to improve performance of the 1D Readers.
- (ZXBitArray *)blackRow:(int)y row:(ZXBitArray *)row error:(NSError **)error;

// Does not sharpen the data, as this call is intended to only be used by 2D Readers.
- (ZXBinarizer *)createBinarizer:(ZXLuminanceSource *)source;

@end