import Binarizer from '../Binarizer';
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import LuminanceSource from '../LuminanceSource';
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import BitArray from './BitArray';
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import BitMatrix from './BitMatrix';
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/**
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* This Binarizer implementation uses the old ZXing global histogram approach. It is suitable
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* for low-end mobile devices which don't have enough CPU or memory to use a local thresholding
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* algorithm. However, because it picks a global black point, it cannot handle difficult shadows
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* and gradients.
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*
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* Faster mobile devices and all desktop applications should probably use HybridBinarizer instead.
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*
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* @author dswitkin@google.com (Daniel Switkin)
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* @author Sean Owen
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*/
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export default class GlobalHistogramBinarizer extends Binarizer {
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private static LUMINANCE_BITS;
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private static LUMINANCE_SHIFT;
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private static LUMINANCE_BUCKETS;
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private static EMPTY;
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private luminances;
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private buckets;
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constructor(source: LuminanceSource);
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getBlackRow(y: number, row: BitArray): BitArray;
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getBlackMatrix(): BitMatrix;
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createBinarizer(source: LuminanceSource): Binarizer;
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private initArrays;
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private static estimateBlackPoint;
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}
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