| /* |
| * 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 "ZXGlobalHistogramBinarizer.h" |
| |
| /** |
| * This class implements a local thresholding algorithm, which while slower than the |
| * ZXGlobalHistogramBinarizer, is fairly efficient for what it does. It is designed for |
| * high frequency images of barcodes with black data on white backgrounds. For this application, |
| * it does a much better job than a global blackpoint with severe shadows and gradients. |
| * However it tends to produce artifacts on lower frequency images and is therefore not |
| * a good general purpose binarizer for uses outside ZXing. |
| * |
| * This class extends ZXGlobalHistogramBinarizer, using the older histogram approach for 1D readers, |
| * and the newer local approach for 2D readers. 1D decoding using a per-row histogram is already |
| * inherently local, and only fails for horizontal gradients. We can revisit that problem later, |
| * but for now it was not a win to use local blocks for 1D. |
| * |
| * This Binarizer is the default for the unit tests and the recommended class for library users. |
| */ |
| |
| @class ZXBinarizer, ZXBitMatrix, ZXLuminanceSource; |
| |
| @interface ZXHybridBinarizer : ZXGlobalHistogramBinarizer |
| |
| @end |
