vendor/khanamiryan/qrcode-detector-decoder/lib/common/GlobalHistogramBinarizer.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 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 HybridBinarizer instead.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */

class GlobalHistogramBinarizer extends Binarizer {

    private static $LUMINANCE_BITS = 5;
    private static $LUMINANCE_SHIFT=3;
    private static $LUMINANCE_BUCKETS = 32;

    private static $EMPTY = array();

    private $luminances=array();
    private $buckets = array();
    private $source = array();

    public function __construct($source) {

        self::$LUMINANCE_SHIFT = 8 - self::$LUMINANCE_BITS;
        self::$LUMINANCE_BUCKETS = 1 << self::$LUMINANCE_BITS;

        parent::__construct($source);

        $this->luminances = self::$EMPTY;
        $this->buckets = fill_array(0, self::$LUMINANCE_BUCKETS,0);
        $this->source = $source;
    }

// Applies simple sharpening to the row data to improve performance of the 1D Readers.