com.google.zxing.multi.qrcode.detector.MultiDetector Maven / Gradle / Ivy
/*
* Copyright 2009 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.multi.qrcode.detector;
import com.google.zxing.DecodeHintType;
import com.google.zxing.NotFoundException;
import com.google.zxing.ReaderException;
import com.google.zxing.ResultPointCallback;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.DetectorResult;
import com.google.zxing.qrcode.detector.Detector;
import com.google.zxing.qrcode.detector.FinderPatternInfo;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Encapsulates logic that can detect one or more QR Codes in an image, even if the QR Code
* is rotated or skewed, or partially obscured.
*
* @author Sean Owen
* @author Hannes Erven
*/
public final class MultiDetector extends Detector {
private static final DetectorResult[] EMPTY_DETECTOR_RESULTS = new DetectorResult[0];
public MultiDetector(BitMatrix image) {
super(image);
}
public DetectorResult[] detectMulti(Map hints) throws NotFoundException {
BitMatrix image = getImage();
ResultPointCallback resultPointCallback =
hints == null ? null : (ResultPointCallback) hints.get(DecodeHintType.NEED_RESULT_POINT_CALLBACK);
MultiFinderPatternFinder finder = new MultiFinderPatternFinder(image, resultPointCallback);
FinderPatternInfo[] infos = finder.findMulti(hints);
if (infos.length == 0) {
throw NotFoundException.getNotFoundInstance();
}
List result = new ArrayList<>();
for (FinderPatternInfo info : infos) {
try {
result.add(processFinderPatternInfo(info));
} catch (ReaderException e) {
// ignore
}
}
if (result.isEmpty()) {
return EMPTY_DETECTOR_RESULTS;
} else {
return result.toArray(EMPTY_DETECTOR_RESULTS);
}
}
}