@zxing/library
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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
272 lines (271 loc) • 12.6 kB
JavaScript
/*
* Copyright 2013 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.
*/
// package com.google.zxing.pdf417.decoder;
// import com.google.zxing.pdf417.PDF417Common;
import PDF417Common from '../PDF417Common';
import Formatter from '../../util/Formatter';
/**
* @author Guenther Grau
*/
export default /*final*/ class DetectionResult {
constructor(barcodeMetadata, boundingBox) {
/*final*/ this.ADJUST_ROW_NUMBER_SKIP = 2;
this.barcodeMetadata = barcodeMetadata;
this.barcodeColumnCount = barcodeMetadata.getColumnCount();
this.boundingBox = boundingBox;
// this.detectionResultColumns = new DetectionResultColumn[this.barcodeColumnCount + 2];
this.detectionResultColumns = new Array(this.barcodeColumnCount + 2);
}
getDetectionResultColumns() {
this.adjustIndicatorColumnRowNumbers(this.detectionResultColumns[0]);
this.adjustIndicatorColumnRowNumbers(this.detectionResultColumns[this.barcodeColumnCount + 1]);
let unadjustedCodewordCount = PDF417Common.MAX_CODEWORDS_IN_BARCODE;
let previousUnadjustedCount;
do {
previousUnadjustedCount = unadjustedCodewordCount;
unadjustedCodewordCount = this.adjustRowNumbersAndGetCount();
} while (unadjustedCodewordCount > 0 && unadjustedCodewordCount < previousUnadjustedCount);
return this.detectionResultColumns;
}
adjustIndicatorColumnRowNumbers(detectionResultColumn) {
if (detectionResultColumn != null) {
detectionResultColumn
.adjustCompleteIndicatorColumnRowNumbers(this.barcodeMetadata);
}
}
// TODO ensure that no detected codewords with unknown row number are left
// we should be able to estimate the row height and use it as a hint for the row number
// we should also fill the rows top to bottom and bottom to top
/**
* @return number of codewords which don't have a valid row number. Note that the count is not accurate as codewords
* will be counted several times. It just serves as an indicator to see when we can stop adjusting row numbers
*/
adjustRowNumbersAndGetCount() {
let unadjustedCount = this.adjustRowNumbersByRow();
if (unadjustedCount === 0) {
return 0;
}
for (let barcodeColumn /*int*/ = 1; barcodeColumn < this.barcodeColumnCount + 1; barcodeColumn++) {
let codewords = this.detectionResultColumns[barcodeColumn].getCodewords();
for (let codewordsRow /*int*/ = 0; codewordsRow < codewords.length; codewordsRow++) {
if (codewords[codewordsRow] == null) {
continue;
}
if (!codewords[codewordsRow].hasValidRowNumber()) {
this.adjustRowNumbers(barcodeColumn, codewordsRow, codewords);
}
}
}
return unadjustedCount;
}
adjustRowNumbersByRow() {
this.adjustRowNumbersFromBothRI();
// TODO we should only do full row adjustments if row numbers of left and right row indicator column match.
// Maybe it's even better to calculated the height (rows: d) and divide it by the number of barcode
// rows. This, together with the LRI and RRI row numbers should allow us to get a good estimate where a row
// number starts and ends.
let unadjustedCount = this.adjustRowNumbersFromLRI();
return unadjustedCount + this.adjustRowNumbersFromRRI();
}
adjustRowNumbersFromBothRI() {
if (this.detectionResultColumns[0] == null || this.detectionResultColumns[this.barcodeColumnCount + 1] == null) {
return;
}
let LRIcodewords = this.detectionResultColumns[0].getCodewords();
let RRIcodewords = this.detectionResultColumns[this.barcodeColumnCount + 1].getCodewords();
for (let codewordsRow /*int*/ = 0; codewordsRow < LRIcodewords.length; codewordsRow++) {
if (LRIcodewords[codewordsRow] != null &&
RRIcodewords[codewordsRow] != null &&
LRIcodewords[codewordsRow].getRowNumber() === RRIcodewords[codewordsRow].getRowNumber()) {
for (let barcodeColumn /*int*/ = 1; barcodeColumn <= this.barcodeColumnCount; barcodeColumn++) {
let codeword = this.detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword == null) {
continue;
}
codeword.setRowNumber(LRIcodewords[codewordsRow].getRowNumber());
if (!codeword.hasValidRowNumber()) {
this.detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow] = null;
}
}
}
}
}
adjustRowNumbersFromRRI() {
if (this.detectionResultColumns[this.barcodeColumnCount + 1] == null) {
return 0;
}
let unadjustedCount = 0;
let codewords = this.detectionResultColumns[this.barcodeColumnCount + 1].getCodewords();
for (let codewordsRow /*int*/ = 0; codewordsRow < codewords.length; codewordsRow++) {
if (codewords[codewordsRow] == null) {
continue;
}
let rowIndicatorRowNumber = codewords[codewordsRow].getRowNumber();
let invalidRowCounts = 0;
for (let barcodeColumn /*int*/ = this.barcodeColumnCount + 1; barcodeColumn > 0 && invalidRowCounts < this.ADJUST_ROW_NUMBER_SKIP; barcodeColumn--) {
let codeword = this.detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword != null) {
invalidRowCounts = DetectionResult.adjustRowNumberIfValid(rowIndicatorRowNumber, invalidRowCounts, codeword);
if (!codeword.hasValidRowNumber()) {
unadjustedCount++;
}
}
}
}
return unadjustedCount;
}
adjustRowNumbersFromLRI() {
if (this.detectionResultColumns[0] == null) {
return 0;
}
let unadjustedCount = 0;
let codewords = this.detectionResultColumns[0].getCodewords();
for (let codewordsRow /*int*/ = 0; codewordsRow < codewords.length; codewordsRow++) {
if (codewords[codewordsRow] == null) {
continue;
}
let rowIndicatorRowNumber = codewords[codewordsRow].getRowNumber();
let invalidRowCounts = 0;
for (let barcodeColumn /*int*/ = 1; barcodeColumn < this.barcodeColumnCount + 1 && invalidRowCounts < this.ADJUST_ROW_NUMBER_SKIP; barcodeColumn++) {
let codeword = this.detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword != null) {
invalidRowCounts = DetectionResult.adjustRowNumberIfValid(rowIndicatorRowNumber, invalidRowCounts, codeword);
if (!codeword.hasValidRowNumber()) {
unadjustedCount++;
}
}
}
}
return unadjustedCount;
}
static adjustRowNumberIfValid(rowIndicatorRowNumber, invalidRowCounts, codeword) {
if (codeword == null) {
return invalidRowCounts;
}
if (!codeword.hasValidRowNumber()) {
if (codeword.isValidRowNumber(rowIndicatorRowNumber)) {
codeword.setRowNumber(rowIndicatorRowNumber);
invalidRowCounts = 0;
}
else {
++invalidRowCounts;
}
}
return invalidRowCounts;
}
adjustRowNumbers(barcodeColumn, codewordsRow, codewords) {
if (this.detectionResultColumns[barcodeColumn - 1] == null) {
return;
}
let codeword = codewords[codewordsRow];
let previousColumnCodewords = this.detectionResultColumns[barcodeColumn - 1].getCodewords();
let nextColumnCodewords = previousColumnCodewords;
if (this.detectionResultColumns[barcodeColumn + 1] != null) {
nextColumnCodewords = this.detectionResultColumns[barcodeColumn + 1].getCodewords();
}
// let otherCodewords: Codeword[] = new Codeword[14];
let otherCodewords = new Array(14);
otherCodewords[2] = previousColumnCodewords[codewordsRow];
otherCodewords[3] = nextColumnCodewords[codewordsRow];
if (codewordsRow > 0) {
otherCodewords[0] = codewords[codewordsRow - 1];
otherCodewords[4] = previousColumnCodewords[codewordsRow - 1];
otherCodewords[5] = nextColumnCodewords[codewordsRow - 1];
}
if (codewordsRow > 1) {
otherCodewords[8] = codewords[codewordsRow - 2];
otherCodewords[10] = previousColumnCodewords[codewordsRow - 2];
otherCodewords[11] = nextColumnCodewords[codewordsRow - 2];
}
if (codewordsRow < codewords.length - 1) {
otherCodewords[1] = codewords[codewordsRow + 1];
otherCodewords[6] = previousColumnCodewords[codewordsRow + 1];
otherCodewords[7] = nextColumnCodewords[codewordsRow + 1];
}
if (codewordsRow < codewords.length - 2) {
otherCodewords[9] = codewords[codewordsRow + 2];
otherCodewords[12] = previousColumnCodewords[codewordsRow + 2];
otherCodewords[13] = nextColumnCodewords[codewordsRow + 2];
}
for (let otherCodeword of otherCodewords) {
if (DetectionResult.adjustRowNumber(codeword, otherCodeword)) {
return;
}
}
}
/**
* @return true, if row number was adjusted, false otherwise
*/
static adjustRowNumber(codeword, otherCodeword) {
if (otherCodeword == null) {
return false;
}
if (otherCodeword.hasValidRowNumber() && otherCodeword.getBucket() === codeword.getBucket()) {
codeword.setRowNumber(otherCodeword.getRowNumber());
return true;
}
return false;
}
getBarcodeColumnCount() {
return this.barcodeColumnCount;
}
getBarcodeRowCount() {
return this.barcodeMetadata.getRowCount();
}
getBarcodeECLevel() {
return this.barcodeMetadata.getErrorCorrectionLevel();
}
setBoundingBox(boundingBox) {
this.boundingBox = boundingBox;
}
getBoundingBox() {
return this.boundingBox;
}
setDetectionResultColumn(barcodeColumn, detectionResultColumn) {
this.detectionResultColumns[barcodeColumn] = detectionResultColumn;
}
getDetectionResultColumn(barcodeColumn) {
return this.detectionResultColumns[barcodeColumn];
}
// @Override
toString() {
let rowIndicatorColumn = this.detectionResultColumns[0];
if (rowIndicatorColumn == null) {
rowIndicatorColumn = this.detectionResultColumns[this.barcodeColumnCount + 1];
}
// try (
let formatter = new Formatter();
// ) {
for (let codewordsRow /*int*/ = 0; codewordsRow < rowIndicatorColumn.getCodewords().length; codewordsRow++) {
formatter.format('CW %3d:', codewordsRow);
for (let barcodeColumn /*int*/ = 0; barcodeColumn < this.barcodeColumnCount + 2; barcodeColumn++) {
if (this.detectionResultColumns[barcodeColumn] == null) {
formatter.format(' | ');
continue;
}
let codeword = this.detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword == null) {
formatter.format(' | ');
continue;
}
formatter.format(' %3d|%3d', codeword.getRowNumber(), codeword.getValue());
}
formatter.format('%n');
}
return formatter.toString();
// }
}
}