@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
30 lines (29 loc) • 1.14 kB
TypeScript
import Binarizer from '../Binarizer';
import LuminanceSource from '../LuminanceSource';
import BitArray from './BitArray';
import BitMatrix from './BitMatrix';
/**
* 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
*/
export default class GlobalHistogramBinarizer extends Binarizer {
private static LUMINANCE_BITS;
private static LUMINANCE_SHIFT;
private static LUMINANCE_BUCKETS;
private static EMPTY;
private luminances;
private buckets;
constructor(source: LuminanceSource);
getBlackRow(y: number, row: BitArray): BitArray;
getBlackMatrix(): BitMatrix;
createBinarizer(source: LuminanceSource): Binarizer;
private initArrays;
private static estimateBlackPoint;
}