com.google.zxing.pdf417.decoder.DetectionResult Maven / Gradle / Ivy
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Core barcode encoding/decoding library
/*
* 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 java.util.Formatter;
/**
* @author Guenther Grau
*/
final class DetectionResult {
private static final int ADJUST_ROW_NUMBER_SKIP = 2;
private final BarcodeMetadata barcodeMetadata;
private final DetectionResultColumn[] detectionResultColumns;
private BoundingBox boundingBox;
private final int barcodeColumnCount;
DetectionResult(BarcodeMetadata barcodeMetadata, BoundingBox boundingBox) {
this.barcodeMetadata = barcodeMetadata;
this.barcodeColumnCount = barcodeMetadata.getColumnCount();
this.boundingBox = boundingBox;
detectionResultColumns = new DetectionResultColumn[barcodeColumnCount + 2];
}
DetectionResultColumn[] getDetectionResultColumns() {
adjustIndicatorColumnRowNumbers(detectionResultColumns[0]);
adjustIndicatorColumnRowNumbers(detectionResultColumns[barcodeColumnCount + 1]);
int unadjustedCodewordCount = PDF417Common.MAX_CODEWORDS_IN_BARCODE;
int previousUnadjustedCount;
do {
previousUnadjustedCount = unadjustedCodewordCount;
unadjustedCodewordCount = adjustRowNumbers();
} while (unadjustedCodewordCount > 0 && unadjustedCodewordCount < previousUnadjustedCount);
return detectionResultColumns;
}
private void adjustIndicatorColumnRowNumbers(DetectionResultColumn detectionResultColumn) {
if (detectionResultColumn != null) {
((DetectionResultRowIndicatorColumn) detectionResultColumn)
.adjustCompleteIndicatorColumnRowNumbers(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
*/
private int adjustRowNumbers() {
int unadjustedCount = adjustRowNumbersByRow();
if (unadjustedCount == 0) {
return 0;
}
for (int barcodeColumn = 1; barcodeColumn < barcodeColumnCount + 1; barcodeColumn++) {
Codeword[] codewords = detectionResultColumns[barcodeColumn].getCodewords();
for (int codewordsRow = 0; codewordsRow < codewords.length; codewordsRow++) {
if (codewords[codewordsRow] == null) {
continue;
}
if (!codewords[codewordsRow].hasValidRowNumber()) {
adjustRowNumbers(barcodeColumn, codewordsRow, codewords);
}
}
}
return unadjustedCount;
}
private int adjustRowNumbersByRow() {
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 (in codeword rows) 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.
int unadjustedCount = adjustRowNumbersFromLRI();
return unadjustedCount + adjustRowNumbersFromRRI();
}
private void adjustRowNumbersFromBothRI() {
if (detectionResultColumns[0] == null || detectionResultColumns[barcodeColumnCount + 1] == null) {
return;
}
Codeword[] LRIcodewords = detectionResultColumns[0].getCodewords();
Codeword[] RRIcodewords = detectionResultColumns[barcodeColumnCount + 1].getCodewords();
for (int codewordsRow = 0; codewordsRow < LRIcodewords.length; codewordsRow++) {
if (LRIcodewords[codewordsRow] != null &&
RRIcodewords[codewordsRow] != null &&
LRIcodewords[codewordsRow].getRowNumber() == RRIcodewords[codewordsRow].getRowNumber()) {
for (int barcodeColumn = 1; barcodeColumn <= barcodeColumnCount; barcodeColumn++) {
Codeword codeword = detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword == null) {
continue;
}
codeword.setRowNumber(LRIcodewords[codewordsRow].getRowNumber());
if (!codeword.hasValidRowNumber()) {
detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow] = null;
}
}
}
}
}
private int adjustRowNumbersFromRRI() {
if (detectionResultColumns[barcodeColumnCount + 1] == null) {
return 0;
}
int unadjustedCount = 0;
Codeword[] codewords = detectionResultColumns[barcodeColumnCount + 1].getCodewords();
for (int codewordsRow = 0; codewordsRow < codewords.length; codewordsRow++) {
if (codewords[codewordsRow] == null) {
continue;
}
int rowIndicatorRowNumber = codewords[codewordsRow].getRowNumber();
int invalidRowCounts = 0;
for (int barcodeColumn = barcodeColumnCount + 1; barcodeColumn > 0 && invalidRowCounts < ADJUST_ROW_NUMBER_SKIP; barcodeColumn--) {
Codeword codeword = detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword != null) {
invalidRowCounts = adjustRowNumberIfValid(rowIndicatorRowNumber, invalidRowCounts, codeword);
if (!codeword.hasValidRowNumber()) {
unadjustedCount++;
}
}
}
}
return unadjustedCount;
}
private int adjustRowNumbersFromLRI() {
if (detectionResultColumns[0] == null) {
return 0;
}
int unadjustedCount = 0;
Codeword[] codewords = detectionResultColumns[0].getCodewords();
for (int codewordsRow = 0; codewordsRow < codewords.length; codewordsRow++) {
if (codewords[codewordsRow] == null) {
continue;
}
int rowIndicatorRowNumber = codewords[codewordsRow].getRowNumber();
int invalidRowCounts = 0;
for (int barcodeColumn = 1; barcodeColumn < barcodeColumnCount + 1 && invalidRowCounts < ADJUST_ROW_NUMBER_SKIP; barcodeColumn++) {
Codeword codeword = detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword != null) {
invalidRowCounts = adjustRowNumberIfValid(rowIndicatorRowNumber, invalidRowCounts, codeword);
if (!codeword.hasValidRowNumber()) {
unadjustedCount++;
}
}
}
}
return unadjustedCount;
}
private static int adjustRowNumberIfValid(int rowIndicatorRowNumber, int invalidRowCounts, Codeword codeword) {
if (codeword == null) {
return invalidRowCounts;
}
if (!codeword.hasValidRowNumber()) {
if (codeword.isValidRowNumber(rowIndicatorRowNumber)) {
codeword.setRowNumber(rowIndicatorRowNumber);
invalidRowCounts = 0;
} else {
++invalidRowCounts;
}
}
return invalidRowCounts;
}
private void adjustRowNumbers(int barcodeColumn, int codewordsRow, Codeword[] codewords) {
Codeword codeword = codewords[codewordsRow];
Codeword[] previousColumnCodewords = detectionResultColumns[barcodeColumn - 1].getCodewords();
Codeword[] nextColumnCodewords = previousColumnCodewords;
if (detectionResultColumns[barcodeColumn + 1] != null) {
nextColumnCodewords = detectionResultColumns[barcodeColumn + 1].getCodewords();
}
Codeword[] otherCodewords = new Codeword[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 (Codeword otherCodeword : otherCodewords) {
if (adjustRowNumber(codeword, otherCodeword)) {
return;
}
}
}
/**
* @return true, if row number was adjusted, false otherwise
*/
private static boolean adjustRowNumber(Codeword codeword, Codeword otherCodeword) {
if (otherCodeword == null) {
return false;
}
if (otherCodeword.hasValidRowNumber() && otherCodeword.getBucket() == codeword.getBucket()) {
codeword.setRowNumber(otherCodeword.getRowNumber());
return true;
}
return false;
}
int getBarcodeColumnCount() {
return barcodeColumnCount;
}
int getBarcodeRowCount() {
return barcodeMetadata.getRowCount();
}
int getBarcodeECLevel() {
return barcodeMetadata.getErrorCorrectionLevel();
}
public void setBoundingBox(BoundingBox boundingBox) {
this.boundingBox = boundingBox;
}
BoundingBox getBoundingBox() {
return boundingBox;
}
void setDetectionResultColumn(int barcodeColumn, DetectionResultColumn detectionResultColumn) {
detectionResultColumns[barcodeColumn] = detectionResultColumn;
}
DetectionResultColumn getDetectionResultColumn(int barcodeColumn) {
return detectionResultColumns[barcodeColumn];
}
@Override
public String toString() {
DetectionResultColumn rowIndicatorColumn = detectionResultColumns[0];
if (rowIndicatorColumn == null) {
rowIndicatorColumn = detectionResultColumns[barcodeColumnCount + 1];
}
Formatter formatter = new Formatter();
for (int codewordsRow = 0; codewordsRow < rowIndicatorColumn.getCodewords().length; codewordsRow++) {
formatter.format("CW %3d:", codewordsRow);
for (int barcodeColumn = 0; barcodeColumn < barcodeColumnCount + 2; barcodeColumn++) {
if (detectionResultColumns[barcodeColumn] == null) {
formatter.format(" | ");
continue;
}
Codeword codeword = detectionResultColumns[barcodeColumn].getCodewords()[codewordsRow];
if (codeword == null) {
formatter.format(" | ");
continue;
}
formatter.format(" %3d|%3d", codeword.getRowNumber(), codeword.getValue());
}
formatter.format("\n");
}
String result = formatter.toString();
formatter.close();
return result;
}
}
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