下面列出了怎么用com.google.zxing.pdf417.PDF417Common的API类实例代码及写法,或者点击链接到github查看源代码。
private static int[] sampleBitCounts(int[] moduleBitCount) {
float bitCountSum = PDF417Common.getBitCountSum(moduleBitCount);
int[] result = new int[PDF417Common.BARS_IN_MODULE];
int bitCountIndex = 0;
int sumPreviousBits = 0;
for (int i = 0; i < PDF417Common.MODULES_IN_CODEWORD; i++) {
float sampleIndex =
bitCountSum / (2 * PDF417Common.MODULES_IN_CODEWORD) +
(i * bitCountSum) / PDF417Common.MODULES_IN_CODEWORD;
if (sumPreviousBits + moduleBitCount[bitCountIndex] <= sampleIndex) {
sumPreviousBits += moduleBitCount[bitCountIndex];
bitCountIndex++;
}
result[bitCountIndex]++;
}
return result;
}
private static int getClosestDecodedValue(int[] moduleBitCount) {
int bitCountSum = PDF417Common.getBitCountSum(moduleBitCount);
float[] bitCountRatios = new float[PDF417Common.BARS_IN_MODULE];
for (int i = 0; i < bitCountRatios.length; i++) {
bitCountRatios[i] = moduleBitCount[i] / (float) bitCountSum;
}
float bestMatchError = Float.MAX_VALUE;
int bestMatch = -1;
for (int j = 0; j < RATIOS_TABLE.length; j++) {
float error = 0.0f;
float[] ratioTableRow = RATIOS_TABLE[j];
for (int k = 0; k < PDF417Common.BARS_IN_MODULE; k++) {
float diff = ratioTableRow[k] - bitCountRatios[k];
error += diff * diff;
if (error >= bestMatchError) {
break;
}
}
if (error < bestMatchError) {
bestMatchError = error;
bestMatch = PDF417Common.SYMBOL_TABLE[j];
}
}
return bestMatch;
}
private static void adjustCodewordCount(DetectionResult detectionResult, BarcodeValue[][] barcodeMatrix)
throws NotFoundException {
int[] numberOfCodewords = barcodeMatrix[0][1].getValue();
int calculatedNumberOfCodewords = detectionResult.getBarcodeColumnCount() *
detectionResult.getBarcodeRowCount() -
getNumberOfECCodeWords(detectionResult.getBarcodeECLevel());
if (numberOfCodewords.length == 0) {
if (calculatedNumberOfCodewords < 1 || calculatedNumberOfCodewords > PDF417Common.MAX_CODEWORDS_IN_BARCODE) {
throw NotFoundException.getNotFoundInstance();
}
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
} else if (numberOfCodewords[0] != calculatedNumberOfCodewords) {
// The calculated one is more reliable as it is derived from the row indicator columns
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
}
}
private static int[] sampleBitCounts(int[] moduleBitCount) {
float bitCountSum = PDF417Common.getBitCountSum(moduleBitCount);
int[] result = new int[PDF417Common.BARS_IN_MODULE];
int bitCountIndex = 0;
int sumPreviousBits = 0;
for (int i = 0; i < PDF417Common.MODULES_IN_CODEWORD; i++) {
float sampleIndex =
bitCountSum / (2 * PDF417Common.MODULES_IN_CODEWORD) +
(i * bitCountSum) / PDF417Common.MODULES_IN_CODEWORD;
if (sumPreviousBits + moduleBitCount[bitCountIndex] <= sampleIndex) {
sumPreviousBits += moduleBitCount[bitCountIndex];
bitCountIndex++;
}
result[bitCountIndex]++;
}
return result;
}
private static int getClosestDecodedValue(int[] moduleBitCount) {
int bitCountSum = PDF417Common.getBitCountSum(moduleBitCount);
float[] bitCountRatios = new float[PDF417Common.BARS_IN_MODULE];
for (int i = 0; i < bitCountRatios.length; i++) {
bitCountRatios[i] = moduleBitCount[i] / (float) bitCountSum;
}
float bestMatchError = Float.MAX_VALUE;
int bestMatch = -1;
for (int j = 0; j < RATIOS_TABLE.length; j++) {
float error = 0.0f;
float[] ratioTableRow = RATIOS_TABLE[j];
for (int k = 0; k < PDF417Common.BARS_IN_MODULE; k++) {
float diff = ratioTableRow[k] - bitCountRatios[k];
error += diff * diff;
if (error >= bestMatchError) {
break;
}
}
if (error < bestMatchError) {
bestMatchError = error;
bestMatch = PDF417Common.SYMBOL_TABLE[j];
}
}
return bestMatch;
}
private static void adjustCodewordCount(DetectionResult detectionResult, BarcodeValue[][] barcodeMatrix)
throws NotFoundException {
int[] numberOfCodewords = barcodeMatrix[0][1].getValue();
int calculatedNumberOfCodewords = detectionResult.getBarcodeColumnCount() *
detectionResult.getBarcodeRowCount() -
getNumberOfECCodeWords(detectionResult.getBarcodeECLevel());
if (numberOfCodewords.length == 0) {
if (calculatedNumberOfCodewords < 1 || calculatedNumberOfCodewords > PDF417Common.MAX_CODEWORDS_IN_BARCODE) {
throw NotFoundException.getNotFoundInstance();
}
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
} else if (numberOfCodewords[0] != calculatedNumberOfCodewords) {
// The calculated one is more reliable as it is derived from the row indicator columns
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
}
}
private static int[] sampleBitCounts(int[] moduleBitCount) {
float bitCountSum = PDF417Common.getBitCountSum(moduleBitCount);
int[] result = new int[PDF417Common.BARS_IN_MODULE];
int bitCountIndex = 0;
int sumPreviousBits = 0;
for (int i = 0; i < PDF417Common.MODULES_IN_CODEWORD; i++) {
float sampleIndex =
bitCountSum / (2 * PDF417Common.MODULES_IN_CODEWORD) +
(i * bitCountSum) / PDF417Common.MODULES_IN_CODEWORD;
if (sumPreviousBits + moduleBitCount[bitCountIndex] <= sampleIndex) {
sumPreviousBits += moduleBitCount[bitCountIndex];
bitCountIndex++;
}
result[bitCountIndex]++;
}
return result;
}
private static int getClosestDecodedValue(int[] moduleBitCount) {
int bitCountSum = PDF417Common.getBitCountSum(moduleBitCount);
float[] bitCountRatios = new float[PDF417Common.BARS_IN_MODULE];
for (int i = 0; i < bitCountRatios.length; i++) {
bitCountRatios[i] = moduleBitCount[i] / (float) bitCountSum;
}
float bestMatchError = Float.MAX_VALUE;
int bestMatch = -1;
for (int j = 0; j < RATIOS_TABLE.length; j++) {
float error = 0.0f;
float[] ratioTableRow = RATIOS_TABLE[j];
for (int k = 0; k < PDF417Common.BARS_IN_MODULE; k++) {
float diff = ratioTableRow[k] - bitCountRatios[k];
error += diff * diff;
if (error >= bestMatchError) {
break;
}
}
if (error < bestMatchError) {
bestMatchError = error;
bestMatch = PDF417Common.SYMBOL_TABLE[j];
}
}
return bestMatch;
}
private static void adjustCodewordCount(DetectionResult detectionResult, BarcodeValue[][] barcodeMatrix)
throws NotFoundException {
int[] numberOfCodewords = barcodeMatrix[0][1].getValue();
int calculatedNumberOfCodewords = detectionResult.getBarcodeColumnCount() *
detectionResult.getBarcodeRowCount() -
getNumberOfECCodeWords(detectionResult.getBarcodeECLevel());
if (numberOfCodewords.length == 0) {
if (calculatedNumberOfCodewords < 1 || calculatedNumberOfCodewords > PDF417Common.MAX_CODEWORDS_IN_BARCODE) {
throw NotFoundException.getNotFoundInstance();
}
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
} else if (numberOfCodewords[0] != calculatedNumberOfCodewords) {
// The calculated one is more reliable as it is derived from the row indicator columns
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
}
}
private static int[] sampleBitCounts(int[] moduleBitCount) {
float bitCountSum = MathUtils.sum(moduleBitCount);
int[] result = new int[PDF417Common.BARS_IN_MODULE];
int bitCountIndex = 0;
int sumPreviousBits = 0;
for (int i = 0; i < PDF417Common.MODULES_IN_CODEWORD; i++) {
float sampleIndex =
bitCountSum / (2 * PDF417Common.MODULES_IN_CODEWORD) +
(i * bitCountSum) / PDF417Common.MODULES_IN_CODEWORD;
if (sumPreviousBits + moduleBitCount[bitCountIndex] <= sampleIndex) {
sumPreviousBits += moduleBitCount[bitCountIndex];
bitCountIndex++;
}
result[bitCountIndex]++;
}
return result;
}
private static int getClosestDecodedValue(int[] moduleBitCount) {
int bitCountSum = MathUtils.sum(moduleBitCount);
float[] bitCountRatios = new float[PDF417Common.BARS_IN_MODULE];
for (int i = 0; i < bitCountRatios.length; i++) {
bitCountRatios[i] = moduleBitCount[i] / (float) bitCountSum;
}
float bestMatchError = Float.MAX_VALUE;
int bestMatch = -1;
for (int j = 0; j < RATIOS_TABLE.length; j++) {
float error = 0.0f;
float[] ratioTableRow = RATIOS_TABLE[j];
for (int k = 0; k < PDF417Common.BARS_IN_MODULE; k++) {
float diff = ratioTableRow[k] - bitCountRatios[k];
error += diff * diff;
if (error >= bestMatchError) {
break;
}
}
if (error < bestMatchError) {
bestMatchError = error;
bestMatch = PDF417Common.SYMBOL_TABLE[j];
}
}
return bestMatch;
}
private static void adjustCodewordCount(DetectionResult detectionResult, BarcodeValue[][] barcodeMatrix)
throws NotFoundException {
int[] numberOfCodewords = barcodeMatrix[0][1].getValue();
int calculatedNumberOfCodewords = detectionResult.getBarcodeColumnCount() *
detectionResult.getBarcodeRowCount() -
getNumberOfECCodeWords(detectionResult.getBarcodeECLevel());
if (numberOfCodewords.length == 0) {
if (calculatedNumberOfCodewords < 1 || calculatedNumberOfCodewords > PDF417Common.MAX_CODEWORDS_IN_BARCODE) {
throw NotFoundException.getNotFoundInstance();
}
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
} else if (numberOfCodewords[0] != calculatedNumberOfCodewords) {
// The calculated one is more reliable as it is derived from the row indicator columns
barcodeMatrix[0][1].setValue(calculatedNumberOfCodewords);
}
}
private static DecoderResult createDecoderResult(DetectionResult detectionResult) throws FormatException,
ChecksumException, NotFoundException {
BarcodeValue[][] barcodeMatrix = createBarcodeMatrix(detectionResult);
adjustCodewordCount(detectionResult, barcodeMatrix);
Collection<Integer> erasures = new ArrayList<>();
int[] codewords = new int[detectionResult.getBarcodeRowCount() * detectionResult.getBarcodeColumnCount()];
List<int[]> ambiguousIndexValuesList = new ArrayList<>();
List<Integer> ambiguousIndexesList = new ArrayList<>();
for (int row = 0; row < detectionResult.getBarcodeRowCount(); row++) {
for (int column = 0; column < detectionResult.getBarcodeColumnCount(); column++) {
int[] values = barcodeMatrix[row][column + 1].getValue();
int codewordIndex = row * detectionResult.getBarcodeColumnCount() + column;
if (values.length == 0) {
erasures.add(codewordIndex);
} else if (values.length == 1) {
codewords[codewordIndex] = values[0];
} else {
ambiguousIndexesList.add(codewordIndex);
ambiguousIndexValuesList.add(values);
}
}
}
int[][] ambiguousIndexValues = new int[ambiguousIndexValuesList.size()][];
for (int i = 0; i < ambiguousIndexValues.length; i++) {
ambiguousIndexValues[i] = ambiguousIndexValuesList.get(i);
}
return createDecoderResultFromAmbiguousValues(detectionResult.getBarcodeECLevel(), codewords,
PDF417Common.toIntArray(erasures), PDF417Common.toIntArray(ambiguousIndexesList), ambiguousIndexValues);
}
/**
* Determines the maximum occurrence of a set value and returns all values which were set with this occurrence.
* @return an array of int, containing the values with the highest occurrence, or null, if no value was set
*/
int[] getValue() {
int maxConfidence = -1;
Collection<Integer> result = new ArrayList<>();
for (Entry<Integer,Integer> entry : values.entrySet()) {
if (entry.getValue() > maxConfidence) {
maxConfidence = entry.getValue();
result.clear();
result.add(entry.getKey());
} else if (entry.getValue() == maxConfidence) {
result.add(entry.getKey());
}
}
return PDF417Common.toIntArray(result);
}
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 static DecoderResult createDecoderResult(DetectionResult detectionResult) throws FormatException,
ChecksumException, NotFoundException {
BarcodeValue[][] barcodeMatrix = createBarcodeMatrix(detectionResult);
adjustCodewordCount(detectionResult, barcodeMatrix);
Collection<Integer> erasures = new ArrayList<>();
int[] codewords = new int[detectionResult.getBarcodeRowCount() * detectionResult.getBarcodeColumnCount()];
List<int[]> ambiguousIndexValuesList = new ArrayList<>();
List<Integer> ambiguousIndexesList = new ArrayList<>();
for (int row = 0; row < detectionResult.getBarcodeRowCount(); row++) {
for (int column = 0; column < detectionResult.getBarcodeColumnCount(); column++) {
int[] values = barcodeMatrix[row][column + 1].getValue();
int codewordIndex = row * detectionResult.getBarcodeColumnCount() + column;
if (values.length == 0) {
erasures.add(codewordIndex);
} else if (values.length == 1) {
codewords[codewordIndex] = values[0];
} else {
ambiguousIndexesList.add(codewordIndex);
ambiguousIndexValuesList.add(values);
}
}
}
int[][] ambiguousIndexValues = new int[ambiguousIndexValuesList.size()][];
for (int i = 0; i < ambiguousIndexValues.length; i++) {
ambiguousIndexValues[i] = ambiguousIndexValuesList.get(i);
}
return createDecoderResultFromAmbiguousValues(detectionResult.getBarcodeECLevel(), codewords,
PDF417Common.toIntArray(erasures), PDF417Common.toIntArray(ambiguousIndexesList), ambiguousIndexValues);
}
/**
* Determines the maximum occurrence of a set value and returns all values which were set with this occurrence.
* @return an array of int, containing the values with the highest occurrence, or null, if no value was set
*/
int[] getValue() {
int maxConfidence = -1;
Collection<Integer> result = new ArrayList<>();
for (Entry<Integer,Integer> entry : values.entrySet()) {
if (entry.getValue() > maxConfidence) {
maxConfidence = entry.getValue();
result.clear();
result.add(entry.getKey());
} else if (entry.getValue() == maxConfidence) {
result.add(entry.getKey());
}
}
return PDF417Common.toIntArray(result);
}
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 static DecoderResult createDecoderResult(DetectionResult detectionResult) throws FormatException,
ChecksumException, NotFoundException {
BarcodeValue[][] barcodeMatrix = createBarcodeMatrix(detectionResult);
adjustCodewordCount(detectionResult, barcodeMatrix);
Collection<Integer> erasures = new ArrayList<>();
int[] codewords = new int[detectionResult.getBarcodeRowCount() * detectionResult.getBarcodeColumnCount()];
List<int[]> ambiguousIndexValuesList = new ArrayList<>();
List<Integer> ambiguousIndexesList = new ArrayList<>();
for (int row = 0; row < detectionResult.getBarcodeRowCount(); row++) {
for (int column = 0; column < detectionResult.getBarcodeColumnCount(); column++) {
int[] values = barcodeMatrix[row][column + 1].getValue();
int codewordIndex = row * detectionResult.getBarcodeColumnCount() + column;
if (values.length == 0) {
erasures.add(codewordIndex);
} else if (values.length == 1) {
codewords[codewordIndex] = values[0];
} else {
ambiguousIndexesList.add(codewordIndex);
ambiguousIndexValuesList.add(values);
}
}
}
int[][] ambiguousIndexValues = new int[ambiguousIndexValuesList.size()][];
for (int i = 0; i < ambiguousIndexValues.length; i++) {
ambiguousIndexValues[i] = ambiguousIndexValuesList.get(i);
}
return createDecoderResultFromAmbiguousValues(detectionResult.getBarcodeECLevel(), codewords,
PDF417Common.toIntArray(erasures), PDF417Common.toIntArray(ambiguousIndexesList), ambiguousIndexValues);
}
/**
* Determines the maximum occurrence of a set value and returns all values which were set with this occurrence.
* @return an array of int, containing the values with the highest occurrence, or null, if no value was set
*/
int[] getValue() {
int maxConfidence = -1;
Collection<Integer> result = new ArrayList<>();
for (Entry<Integer,Integer> entry : values.entrySet()) {
if (entry.getValue() > maxConfidence) {
maxConfidence = entry.getValue();
result.clear();
result.add(entry.getKey());
} else if (entry.getValue() == maxConfidence) {
result.add(entry.getKey());
}
}
return PDF417Common.toIntArray(result);
}
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 static DecoderResult createDecoderResult(DetectionResult detectionResult) throws FormatException,
ChecksumException, NotFoundException {
BarcodeValue[][] barcodeMatrix = createBarcodeMatrix(detectionResult);
adjustCodewordCount(detectionResult, barcodeMatrix);
Collection<Integer> erasures = new ArrayList<>();
int[] codewords = new int[detectionResult.getBarcodeRowCount() * detectionResult.getBarcodeColumnCount()];
List<int[]> ambiguousIndexValuesList = new ArrayList<>();
List<Integer> ambiguousIndexesList = new ArrayList<>();
for (int row = 0; row < detectionResult.getBarcodeRowCount(); row++) {
for (int column = 0; column < detectionResult.getBarcodeColumnCount(); column++) {
int[] values = barcodeMatrix[row][column + 1].getValue();
int codewordIndex = row * detectionResult.getBarcodeColumnCount() + column;
if (values.length == 0) {
erasures.add(codewordIndex);
} else if (values.length == 1) {
codewords[codewordIndex] = values[0];
} else {
ambiguousIndexesList.add(codewordIndex);
ambiguousIndexValuesList.add(values);
}
}
}
int[][] ambiguousIndexValues = new int[ambiguousIndexValuesList.size()][];
for (int i = 0; i < ambiguousIndexValues.length; i++) {
ambiguousIndexValues[i] = ambiguousIndexValuesList.get(i);
}
return createDecoderResultFromAmbiguousValues(detectionResult.getBarcodeECLevel(), codewords,
PDF417Common.toIntArray(erasures), PDF417Common.toIntArray(ambiguousIndexesList), ambiguousIndexValues);
}
/**
* Determines the maximum occurrence of a set value and returns all values which were set with this occurrence.
* @return an array of int, containing the values with the highest occurrence, or null, if no value was set
*/
int[] getValue() {
int maxConfidence = -1;
Collection<Integer> result = new ArrayList<>();
for (Entry<Integer,Integer> entry : values.entrySet()) {
if (entry.getValue() > maxConfidence) {
maxConfidence = entry.getValue();
result.clear();
result.add(entry.getKey());
} else if (entry.getValue() == maxConfidence) {
result.add(entry.getKey());
}
}
return PDF417Common.toIntArray(result);
}
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 static int getDecodedCodewordValue(int[] moduleBitCount) {
int decodedValue = getBitValue(moduleBitCount);
return PDF417Common.getCodeword(decodedValue) == -1 ? -1 : decodedValue;
}
BarcodeMetadata getBarcodeMetadata() {
Codeword[] codewords = getCodewords();
BarcodeValue barcodeColumnCount = new BarcodeValue();
BarcodeValue barcodeRowCountUpperPart = new BarcodeValue();
BarcodeValue barcodeRowCountLowerPart = new BarcodeValue();
BarcodeValue barcodeECLevel = new BarcodeValue();
for (Codeword codeword : codewords) {
if (codeword == null) {
continue;
}
codeword.setRowNumberAsRowIndicatorColumn();
int rowIndicatorValue = codeword.getValue() % 30;
int codewordRowNumber = codeword.getRowNumber();
if (!isLeft) {
codewordRowNumber += 2;
}
switch (codewordRowNumber % 3) {
case 0:
barcodeRowCountUpperPart.setValue(rowIndicatorValue * 3 + 1);
break;
case 1:
barcodeECLevel.setValue(rowIndicatorValue / 3);
barcodeRowCountLowerPart.setValue(rowIndicatorValue % 3);
break;
case 2:
barcodeColumnCount.setValue(rowIndicatorValue + 1);
break;
}
}
// Maybe we should check if we have ambiguous values?
if ((barcodeColumnCount.getValue().length == 0) ||
(barcodeRowCountUpperPart.getValue().length == 0) ||
(barcodeRowCountLowerPart.getValue().length == 0) ||
(barcodeECLevel.getValue().length == 0) ||
barcodeColumnCount.getValue()[0] < 1 ||
barcodeRowCountUpperPart.getValue()[0] + barcodeRowCountLowerPart.getValue()[0] < PDF417Common.MIN_ROWS_IN_BARCODE ||
barcodeRowCountUpperPart.getValue()[0] + barcodeRowCountLowerPart.getValue()[0] > PDF417Common.MAX_ROWS_IN_BARCODE) {
return null;
}
BarcodeMetadata barcodeMetadata = new BarcodeMetadata(barcodeColumnCount.getValue()[0],
barcodeRowCountUpperPart.getValue()[0], barcodeRowCountLowerPart.getValue()[0], barcodeECLevel.getValue()[0]);
removeIncorrectCodewords(codewords, barcodeMetadata);
return barcodeMetadata;
}
private static Codeword detectCodeword(BitMatrix image,
int minColumn,
int maxColumn,
boolean leftToRight,
int startColumn,
int imageRow,
int minCodewordWidth,
int maxCodewordWidth) {
startColumn = adjustCodewordStartColumn(image, minColumn, maxColumn, leftToRight, startColumn, imageRow);
// we usually know fairly exact now how long a codeword is. We should provide minimum and maximum expected length
// and try to adjust the read pixels, e.g. remove single pixel errors or try to cut off exceeding pixels.
// min and maxCodewordWidth should not be used as they are calculated for the whole barcode an can be inaccurate
// for the current position
int[] moduleBitCount = getModuleBitCount(image, minColumn, maxColumn, leftToRight, startColumn, imageRow);
if (moduleBitCount == null) {
return null;
}
int endColumn;
int codewordBitCount = PDF417Common.getBitCountSum(moduleBitCount);
if (leftToRight) {
endColumn = startColumn + codewordBitCount;
} else {
for (int i = 0; i < moduleBitCount.length / 2; i++) {
int tmpCount = moduleBitCount[i];
moduleBitCount[i] = moduleBitCount[moduleBitCount.length - 1 - i];
moduleBitCount[moduleBitCount.length - 1 - i] = tmpCount;
}
endColumn = startColumn;
startColumn = endColumn - codewordBitCount;
}
// TODO implement check for width and correction of black and white bars
// use start (and maybe stop pattern) to determine if blackbars are wider than white bars. If so, adjust.
// should probably done only for codewords with a lot more than 17 bits.
// The following fixes 10-1.png, which has wide black bars and small white bars
// for (int i = 0; i < moduleBitCount.length; i++) {
// if (i % 2 == 0) {
// moduleBitCount[i]--;
// } else {
// moduleBitCount[i]++;
// }
// }
// We could also use the width of surrounding codewords for more accurate results, but this seems
// sufficient for now
if (!checkCodewordSkew(codewordBitCount, minCodewordWidth, maxCodewordWidth)) {
// We could try to use the startX and endX position of the codeword in the same column in the previous row,
// create the bit count from it and normalize it to 8. This would help with single pixel errors.
return null;
}
int decodedValue = PDF417CodewordDecoder.getDecodedValue(moduleBitCount);
int codeword = PDF417Common.getCodeword(decodedValue);
if (codeword == -1) {
return null;
}
return new Codeword(startColumn, endColumn, getCodewordBucketNumber(decodedValue), codeword);
}
private static int getDecodedCodewordValue(int[] moduleBitCount) {
int decodedValue = getBitValue(moduleBitCount);
return PDF417Common.getCodeword(decodedValue) == -1 ? -1 : decodedValue;
}
BarcodeMetadata getBarcodeMetadata() {
Codeword[] codewords = getCodewords();
BarcodeValue barcodeColumnCount = new BarcodeValue();
BarcodeValue barcodeRowCountUpperPart = new BarcodeValue();
BarcodeValue barcodeRowCountLowerPart = new BarcodeValue();
BarcodeValue barcodeECLevel = new BarcodeValue();
for (Codeword codeword : codewords) {
if (codeword == null) {
continue;
}
codeword.setRowNumberAsRowIndicatorColumn();
int rowIndicatorValue = codeword.getValue() % 30;
int codewordRowNumber = codeword.getRowNumber();
if (!isLeft) {
codewordRowNumber += 2;
}
switch (codewordRowNumber % 3) {
case 0:
barcodeRowCountUpperPart.setValue(rowIndicatorValue * 3 + 1);
break;
case 1:
barcodeECLevel.setValue(rowIndicatorValue / 3);
barcodeRowCountLowerPart.setValue(rowIndicatorValue % 3);
break;
case 2:
barcodeColumnCount.setValue(rowIndicatorValue + 1);
break;
}
}
// Maybe we should check if we have ambiguous values?
if ((barcodeColumnCount.getValue().length == 0) ||
(barcodeRowCountUpperPart.getValue().length == 0) ||
(barcodeRowCountLowerPart.getValue().length == 0) ||
(barcodeECLevel.getValue().length == 0) ||
barcodeColumnCount.getValue()[0] < 1 ||
barcodeRowCountUpperPart.getValue()[0] + barcodeRowCountLowerPart.getValue()[0] < PDF417Common.MIN_ROWS_IN_BARCODE ||
barcodeRowCountUpperPart.getValue()[0] + barcodeRowCountLowerPart.getValue()[0] > PDF417Common.MAX_ROWS_IN_BARCODE) {
return null;
}
BarcodeMetadata barcodeMetadata = new BarcodeMetadata(barcodeColumnCount.getValue()[0],
barcodeRowCountUpperPart.getValue()[0], barcodeRowCountLowerPart.getValue()[0], barcodeECLevel.getValue()[0]);
removeIncorrectCodewords(codewords, barcodeMetadata);
return barcodeMetadata;
}
private static Codeword detectCodeword(BitMatrix image,
int minColumn,
int maxColumn,
boolean leftToRight,
int startColumn,
int imageRow,
int minCodewordWidth,
int maxCodewordWidth) {
startColumn = adjustCodewordStartColumn(image, minColumn, maxColumn, leftToRight, startColumn, imageRow);
// we usually know fairly exact now how long a codeword is. We should provide minimum and maximum expected length
// and try to adjust the read pixels, e.g. remove single pixel errors or try to cut off exceeding pixels.
// min and maxCodewordWidth should not be used as they are calculated for the whole barcode an can be inaccurate
// for the current position
int[] moduleBitCount = getModuleBitCount(image, minColumn, maxColumn, leftToRight, startColumn, imageRow);
if (moduleBitCount == null) {
return null;
}
int endColumn;
int codewordBitCount = PDF417Common.getBitCountSum(moduleBitCount);
if (leftToRight) {
endColumn = startColumn + codewordBitCount;
} else {
for (int i = 0; i < moduleBitCount.length / 2; i++) {
int tmpCount = moduleBitCount[i];
moduleBitCount[i] = moduleBitCount[moduleBitCount.length - 1 - i];
moduleBitCount[moduleBitCount.length - 1 - i] = tmpCount;
}
endColumn = startColumn;
startColumn = endColumn - codewordBitCount;
}
// TODO implement check for width and correction of black and white bars
// use start (and maybe stop pattern) to determine if blackbars are wider than white bars. If so, adjust.
// should probably done only for codewords with a lot more than 17 bits.
// The following fixes 10-1.png, which has wide black bars and small white bars
// for (int i = 0; i < moduleBitCount.length; i++) {
// if (i % 2 == 0) {
// moduleBitCount[i]--;
// } else {
// moduleBitCount[i]++;
// }
// }
// We could also use the width of surrounding codewords for more accurate results, but this seems
// sufficient for now
if (!checkCodewordSkew(codewordBitCount, minCodewordWidth, maxCodewordWidth)) {
// We could try to use the startX and endX position of the codeword in the same column in the previous row,
// create the bit count from it and normalize it to 8. This would help with single pixel errors.
return null;
}
int decodedValue = PDF417CodewordDecoder.getDecodedValue(moduleBitCount);
int codeword = PDF417Common.getCodeword(decodedValue);
if (codeword == -1) {
return null;
}
return new Codeword(startColumn, endColumn, getCodewordBucketNumber(decodedValue), codeword);
}