vendor/khanamiryan/qrcode-detector-decoder/lib/common/HybridBinarizer.php

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<?php
/*
* Copyright 2009 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.
*/

namespace Zxing\Common;

use Zxing\Binarizer;
use Zxing\LuminanceSource;
use Zxing\NotFoundException;

/**
 * This class implements a local thresholding algorithm, which while slower than the
 * GlobalHistogramBinarizer, 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 GlobalHistogramBinarizer, 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.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
final class HybridBinarizer extends GlobalHistogramBinarizer {

// This class uses 5x5 blocks to compute local luminance, where each block is 8x8 pixels.
// So this is the smallest dimension in each axis we can accept.
    private static  $BLOCK_SIZE_POWER = 3;
    private static $BLOCK_SIZE = 8; // ...0100...00
    private static $BLOCK_SIZE_MASK  = 7;   // ...0011...11
    private static $MINIMUM_DIMENSION = 40;
    private static $MIN_DYNAMIC_RANGE=24;

    private $matrix;

    public function __construct($source) {

        parent::__construct($source);
        self::$BLOCK_SIZE_POWER = 3;
        self::$BLOCK_SIZE = 1 << self::$BLOCK_SIZE_POWER; // ...0100...00
        self::$BLOCK_SIZE_MASK = self::$BLOCK_SIZE - 1;   // ...0011...11
        self::$MINIMUM_DIMENSION = self::$BLOCK_SIZE * 5;
        self::$MIN_DYNAMIC_RANGE = 24;