import BinaryBitmap from '../../BinaryBitmap';
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import DecodeHintType from '../../DecodeHintType';
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import PDF417DetectorResult from './PDF417DetectorResult';
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/**
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* <p>Encapsulates logic that can detect a PDF417 Code in an image, even if the
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* PDF417 Code is rotated or skewed, or partially obscured.</p>
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*
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* @author SITA Lab (kevin.osullivan@sita.aero)
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* @author dswitkin@google.com (Daniel Switkin)
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* @author Guenther Grau
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*/
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export default class Detector {
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private static INDEXES_START_PATTERN;
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private static INDEXES_STOP_PATTERN;
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private static MAX_AVG_VARIANCE;
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private static MAX_INDIVIDUAL_VARIANCE;
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private static START_PATTERN;
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private static STOP_PATTERN;
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private static MAX_PIXEL_DRIFT;
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private static MAX_PATTERN_DRIFT;
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private static SKIPPED_ROW_COUNT_MAX;
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private static ROW_STEP;
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private static BARCODE_MIN_HEIGHT;
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/**
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* <p>Detects a PDF417 Code in an image. Only checks 0 and 180 degree rotations.</p>
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*
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* @param image barcode image to decode
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* @param hints optional hints to detector
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* @param multiple if true, then the image is searched for multiple codes. If false, then at most one code will
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* be found and returned
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* @return {@link PDF417DetectorResult} encapsulating results of detecting a PDF417 code
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* @throws NotFoundException if no PDF417 Code can be found
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*/
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static detectMultiple(image: BinaryBitmap, hints: Map<DecodeHintType, any>, multiple: boolean): PDF417DetectorResult;
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/**
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* Detects PDF417 codes in an image. Only checks 0 degree rotation
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* @param multiple if true, then the image is searched for multiple codes. If false, then at most one code will
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* be found and returned
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* @param bitMatrix bit matrix to detect barcodes in
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* @return List of ResultPoint arrays containing the coordinates of found barcodes
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*/
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private static detect;
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/**
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* Locate the vertices and the codewords area of a black blob using the Start
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* and Stop patterns as locators.
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*
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* @param matrix the scanned barcode image.
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* @return an array containing the vertices:
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* vertices[0] x, y top left barcode
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* vertices[1] x, y bottom left barcode
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* vertices[2] x, y top right barcode
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* vertices[3] x, y bottom right barcode
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* vertices[4] x, y top left codeword area
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* vertices[5] x, y bottom left codeword area
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* vertices[6] x, y top right codeword area
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* vertices[7] x, y bottom right codeword area
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*/
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private static findVertices;
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private static copyToResult;
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private static findRowsWithPattern;
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/**
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* @param matrix row of black/white values to search
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* @param column x position to start search
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* @param row y position to start search
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* @param width the number of pixels to search on this row
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* @param pattern pattern of counts of number of black and white pixels that are
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* being searched for as a pattern
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* @param counters array of counters, as long as pattern, to re-use
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* @return start/end horizontal offset of guard pattern, as an array of two ints.
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*/
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private static findGuardPattern;
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/**
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* Determines how closely a set of observed counts of runs of black/white
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* values matches a given target pattern. This is reported as the ratio of
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* the total variance from the expected pattern proportions across all
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* pattern elements, to the length of the pattern.
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*
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* @param counters observed counters
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* @param pattern expected pattern
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* @param maxIndividualVariance The most any counter can differ before we give up
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* @return ratio of total variance between counters and pattern compared to total pattern size
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*/
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private static patternMatchVariance;
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}
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