mirror of https://github.com/opencv/opencv.git
Merge pull request #24598 from AleksandrPanov:add_android_qr_sample
Add android QR detection sample #24598 Android QR detection sample was added. ![image](https://github.com/opencv/opencv/assets/22337800/0aaf6689-36ee-4201-b609-256d3278641a) ![image](https://github.com/opencv/opencv/assets/22337800/1cf54758-2c96-4108-888b-4796d8825340) ![image](https://github.com/opencv/opencv/assets/22337800/4ecc0933-a2e6-4cc0-abae-7525213c4145) current interface: ![image](https://github.com/opencv/opencv/assets/22337800/aff5b06d-6a9d-4762-be6e-ce20ff2c2271) ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMakepull/24615/head
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<?xml version="1.0" encoding="utf-8"?> |
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<manifest xmlns:android="http://schemas.android.com/apk/res/android" |
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package="org.opencv.samples.qrdetection" |
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android:versionCode="301" |
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android:versionName="3.01" > |
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<uses-sdk android:minSdkVersion="8"/> |
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<application |
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android:icon="@drawable/icon" |
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android:label="@string/app_name" > |
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<activity |
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android:name=".QRdetectionActivity" |
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android:label="@string/app_name" |
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android:screenOrientation="landscape" |
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android:configChanges="keyboardHidden|orientation" > |
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<intent-filter> |
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<action android:name="android.intent.action.MAIN" /> |
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<category android:name="android.intent.category.LAUNCHER" /> |
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</intent-filter> |
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</activity> |
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</application> |
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<uses-permission android:name="android.permission.CAMERA"/> |
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<uses-feature android:name="android.hardware.camera" android:required="false"/> |
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<uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/> |
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<uses-feature android:name="android.hardware.camera.front" android:required="false"/> |
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<uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/> |
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</manifest> |
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set(sample example-qr-detection) |
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add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS "${OPENCV_ANDROID_LIB_DIR}" SDK_TARGET 11 "${ANDROID_SDK_TARGET}") |
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if(TARGET ${sample}) |
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add_dependencies(opencv_android_examples ${sample}) |
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endif() |
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apply plugin: 'com.android.application' |
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android { |
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namespace 'org.opencv.samples.qrdetection' |
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compileSdkVersion @ANDROID_COMPILE_SDK_VERSION@ |
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defaultConfig { |
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applicationId "org.opencv.samples.qrdetection" |
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minSdkVersion @ANDROID_MIN_SDK_VERSION@ |
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targetSdkVersion @ANDROID_TARGET_SDK_VERSION@ |
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versionCode 301 |
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versionName "3.01" |
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} |
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buildTypes { |
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release { |
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minifyEnabled false |
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proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' |
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} |
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} |
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sourceSets { |
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main { |
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java.srcDirs = @ANDROID_SAMPLE_JAVA_PATH@ |
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aidl.srcDirs = @ANDROID_SAMPLE_JAVA_PATH@ |
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res.srcDirs = @ANDROID_SAMPLE_RES_PATH@ |
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manifest.srcFile '@ANDROID_SAMPLE_MANIFEST_PATH@' |
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} |
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} |
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} |
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dependencies { |
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//implementation fileTree(dir: 'libs', include: ['*.jar']) |
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if (gradle.opencv_source == "sdk_path") { |
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implementation project(':opencv') |
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} else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") { |
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implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@' |
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} |
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} |
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<?xml version="1.0" encoding="utf-8"?> |
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<manifest xmlns:android="http://schemas.android.com/apk/res/android" |
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package="org.opencv.samples.qrdetection"> |
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<application |
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android:icon="@drawable/icon" |
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android:label="@string/app_name"> |
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<activity |
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android:exported="true" |
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android:name=".QRdetectionActivity" |
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android:label="@string/app_name" |
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android:screenOrientation="landscape" |
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android:configChanges="keyboardHidden|orientation" > |
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<intent-filter> |
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<action android:name="android.intent.action.MAIN" /> |
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<category android:name="android.intent.category.LAUNCHER" /> |
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</intent-filter> |
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</activity> |
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</application> |
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<uses-permission android:name="android.permission.CAMERA"/> |
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<uses-feature android:name="android.hardware.camera" android:required="false"/> |
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<uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/> |
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<uses-feature android:name="android.hardware.camera.front" android:required="false"/> |
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<uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/> |
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</manifest> |
After Width: | Height: | Size: 2.0 KiB |
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<?xml version="1.0" encoding="utf-8"?> |
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<resources> |
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<string name="app_name">OpenCV QR Detector</string> |
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</resources> |
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package org.opencv.samples.qrdetection; |
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import org.opencv.core.Core; |
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import org.opencv.core.Mat; |
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import org.opencv.core.MatOfPoint; |
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import org.opencv.core.Scalar; |
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import org.opencv.core.Size; |
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import org.opencv.core.Point; |
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import org.opencv.imgproc.Imgproc; |
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import org.opencv.objdetect.GraphicalCodeDetector; |
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import org.opencv.objdetect.QRCodeDetector; |
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import org.opencv.objdetect.QRCodeDetectorAruco; |
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import android.util.Log; |
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import java.util.ArrayList; |
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import java.util.List; |
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public class QRProcessor { |
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private GraphicalCodeDetector detector; |
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private static final String TAG = "QRProcessor"; |
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private Scalar LineColor = new Scalar(255, 0, 0); |
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private Scalar FontColor = new Scalar(0, 0, 255); |
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public QRProcessor(boolean useArucoDetector) { |
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if (useArucoDetector) |
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detector = new QRCodeDetectorAruco(); |
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else |
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detector = new QRCodeDetector(); |
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} |
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private boolean findQRs(Mat inputFrame, List<String> decodedInfo, MatOfPoint points, |
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boolean tryDecode, boolean multiDetect) { |
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boolean result = false; |
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if (multiDetect) { |
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if (tryDecode) |
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result = detector.detectAndDecodeMulti(inputFrame, decodedInfo, points); |
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else |
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result = detector.detectMulti(inputFrame, points); |
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} |
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else { |
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if(tryDecode) { |
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String s = detector.detectAndDecode(inputFrame, points); |
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result = !points.empty(); |
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if (result) |
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decodedInfo.add(s); |
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} |
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else { |
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result = detector.detect(inputFrame, points); |
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} |
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} |
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return result; |
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} |
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private void renderQRs(Mat inputFrame, List<String> decodedInfo, MatOfPoint points) { |
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for (int i = 0; i < points.rows(); i++) { |
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for (int j = 0; j < points.cols(); j++) { |
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Point pt1 = new Point(points.get(i, j)); |
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Point pt2 = new Point(points.get(i, (j + 1) % 4)); |
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Imgproc.line(inputFrame, pt1, pt2, LineColor, 3); |
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} |
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if (!decodedInfo.isEmpty()) { |
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String decode = decodedInfo.get(i); |
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if (decode.length() > 15) { |
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decode = decode.substring(0, 12) + "..."; |
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} |
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int baseline[] = {0}; |
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Size textSize = Imgproc.getTextSize(decode, Imgproc.FONT_HERSHEY_COMPLEX, .95, 3, baseline); |
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Scalar sum = Core.sumElems(points.row(i)); |
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Point start = new Point(sum.val[0] / 4. - textSize.width / 2., sum.val[1] / 4. - textSize.height / 2.); |
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Imgproc.putText(inputFrame, decode, start, Imgproc.FONT_HERSHEY_COMPLEX, .95, FontColor, 3); |
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} |
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} |
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} |
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/* this method to be called from the outside. It processes the frame to find QR codes. */ |
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public synchronized Mat handleFrame(Mat inputFrame, boolean tryDecode, boolean multiDetect) { |
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List<String> decodedInfo = new ArrayList<String>(); |
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MatOfPoint points = new MatOfPoint(); |
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boolean result = findQRs(inputFrame, decodedInfo, points, tryDecode, multiDetect); |
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if (result) { |
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renderQRs(inputFrame, decodedInfo, points); |
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} |
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points.release(); |
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return inputFrame; |
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} |
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} |
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package org.opencv.samples.qrdetection; |
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import org.opencv.android.CameraActivity; |
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import org.opencv.android.OpenCVLoader; |
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import org.opencv.core.Mat; |
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import org.opencv.android.CameraBridgeViewBase; |
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import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener; |
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import org.opencv.android.JavaCameraView; |
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import android.os.Bundle; |
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import android.util.Log; |
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import android.view.Menu; |
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import android.view.MenuItem; |
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import android.view.WindowManager; |
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import android.widget.Toast; |
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import java.util.Collections; |
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import java.util.List; |
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public class QRdetectionActivity extends CameraActivity implements CvCameraViewListener { |
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private static final String TAG = "QRdetection::Activity"; |
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private CameraBridgeViewBase mOpenCvCameraView; |
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private QRProcessor mQRDetector; |
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private MenuItem mItemQRCodeDetectorAruco; |
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private MenuItem mItemQRCodeDetector; |
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private MenuItem mItemTryDecode; |
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private MenuItem mItemMulti; |
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@Override |
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public void onCreate(Bundle savedInstanceState) { |
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super.onCreate(savedInstanceState); |
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getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); |
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if (OpenCVLoader.initLocal()) { |
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Log.i(TAG, "OpenCV loaded successfully"); |
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} else { |
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Log.e(TAG, "OpenCV initialization failed!"); |
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(Toast.makeText(this, "OpenCV initialization failed!", Toast.LENGTH_LONG)).show(); |
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return; |
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} |
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Log.d(TAG, "Creating and setting view"); |
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mOpenCvCameraView = new JavaCameraView(this, -1); |
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setContentView(mOpenCvCameraView); |
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mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE); |
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mOpenCvCameraView.setCvCameraViewListener(this); |
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mQRDetector = new QRProcessor(true); |
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} |
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@Override |
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public void onPause() |
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{ |
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super.onPause(); |
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if (mOpenCvCameraView != null) |
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mOpenCvCameraView.disableView(); |
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} |
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@Override |
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public void onResume() |
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{ |
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super.onResume(); |
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if (mOpenCvCameraView != null) { |
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mOpenCvCameraView.enableView(); |
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} |
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} |
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@Override |
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protected List<? extends CameraBridgeViewBase> getCameraViewList() { |
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return Collections.singletonList(mOpenCvCameraView); |
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} |
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public void onDestroy() { |
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super.onDestroy(); |
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if (mOpenCvCameraView != null) |
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mOpenCvCameraView.disableView(); |
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} |
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@Override |
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public boolean onCreateOptionsMenu(Menu menu) { |
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Log.i(TAG, "called onCreateOptionsMenu"); |
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mItemQRCodeDetectorAruco = menu.add("Aruco-based QR code detector"); |
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mItemQRCodeDetectorAruco.setCheckable(true); |
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mItemQRCodeDetectorAruco.setChecked(true); |
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mItemQRCodeDetector = menu.add("Legacy QR code detector"); |
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mItemQRCodeDetector.setCheckable(true); |
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mItemQRCodeDetector.setChecked(false); |
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mItemTryDecode = menu.add("Try to decode QR codes"); |
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mItemTryDecode.setCheckable(true); |
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mItemTryDecode.setChecked(true); |
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mItemMulti = menu.add("Use multi detect/decode"); |
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mItemMulti.setCheckable(true); |
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mItemMulti.setChecked(true); |
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return true; |
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} |
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@Override |
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public boolean onOptionsItemSelected(MenuItem item) { |
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Log.i(TAG, "Menu Item selected " + item); |
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if (item == mItemQRCodeDetector && !mItemQRCodeDetector.isChecked()) { |
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mQRDetector = new QRProcessor(false); |
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mItemQRCodeDetector.setChecked(true); |
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mItemQRCodeDetectorAruco.setChecked(false); |
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} else if (item == mItemQRCodeDetectorAruco && !mItemQRCodeDetectorAruco.isChecked()) { |
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mQRDetector = new QRProcessor(true); |
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mItemQRCodeDetector.setChecked(false); |
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mItemQRCodeDetectorAruco.setChecked(true); |
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} else if (item == mItemTryDecode) { |
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mItemTryDecode.setChecked(!mItemTryDecode.isChecked()); |
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} else if (item == mItemMulti) { |
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mItemMulti.setChecked(!mItemMulti.isChecked()); |
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} |
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return true; |
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} |
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public void onCameraViewStarted(int width, int height) { |
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} |
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public void onCameraViewStopped() { |
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} |
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public Mat onCameraFrame(Mat inputFrame) { |
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return mQRDetector.handleFrame(inputFrame, mItemTryDecode.isChecked(), mItemMulti.isChecked()); |
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} |
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} |
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