Initial Commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

AndroidDocumentScannerAndFilter/.gitignore

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+/build

AndroidDocumentScannerAndFilter/build.gradle

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+apply plugin: 'com.android.library'
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        minSdkVersion 16
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation project(path: ':java')
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+}

AndroidDocumentScannerAndFilter/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

AndroidDocumentScannerAndFilter/src/androidTest/java/com/namangarg/androiddocumentscannerandfilter/ExampleInstrumentedTest.java

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+package com.namangarg.androiddocumentscannerandfilter;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.namangarg.androiddocumentscannerandfilter.test", appContext.getPackageName());
+    }
+}

AndroidDocumentScannerAndFilter/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.namangarg.androiddocumentscannerandfilter">
+
+    /
+</manifest>

AndroidDocumentScannerAndFilter/src/main/java/com/namangarg/androiddocumentscannerandfilter/DocumentFilter.java

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+package com.namangarg.androiddocumentscannerandfilter;
+
+import android.graphics.Bitmap;
+
+import com.namangarg.androiddocumentscannerandfilter.Filters.BlackAndWhiteFilter;
+import com.namangarg.androiddocumentscannerandfilter.Filters.GreyScaleFilter;
+import com.namangarg.androiddocumentscannerandfilter.Filters.LightenFilter;
+import com.namangarg.androiddocumentscannerandfilter.Filters.MagicFilter;
+import com.namangarg.androiddocumentscannerandfilter.Filters.ShadowRemovelFilter;
+
+import org.opencv.android.OpenCVLoader;
+
+public class DocumentFilter {
+
+    static {
+        OpenCVLoader.initDebug();
+    }
+
+    public static Bitmap getMagicFilter(Bitmap bitmap){
+        return MagicFilter.getMagicFilteredImage(bitmap);
+    }
+
+    public static Bitmap getShadowRemoval(Bitmap bitmap){
+        return ShadowRemovelFilter.getShadowFilteredImage(bitmap);
+    }
+
+    public static Bitmap getGreyScaleFilter(Bitmap bitmap){
+        return GreyScaleFilter.getGreyFilteredImage(bitmap);
+    }
+
+    public static Bitmap getLightenFilter(Bitmap bitmap){
+        return LightenFilter.getLightenFilteredImage(bitmap);
+    }
+
+    public static Bitmap getBlackAndWhiteFilter(Bitmap bitmap){
+        return BlackAndWhiteFilter.getBlackAndWhiteFilteredImage(bitmap);
+    }
+
+}

AndroidDocumentScannerAndFilter/src/main/java/com/namangarg/androiddocumentscannerandfilter/Filters/BlackAndWhiteFilter.java

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+package com.namangarg.androiddocumentscannerandfilter.Filters;
+
+import android.graphics.Bitmap;
+
+import org.opencv.android.Utils;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.imgproc.Imgproc;
+
+public class BlackAndWhiteFilter {
+
+    public static Bitmap getBlackAndWhiteFilteredImage(Bitmap bitmap){
+        // adaptive threshold with median blur
+        // works best on text written on blank paper instead of ruled ones.
+        Mat mat = new Mat(bitmap.getWidth(),bitmap.getHeight(), CvType.CV_8UC1);
+        Utils.bitmapToMat(bitmap, mat);
+        Imgproc.cvtColor(mat, mat, Imgproc.COLOR_RGB2GRAY);
+        Imgproc.medianBlur(mat,mat,5);
+        Imgproc.adaptiveThreshold(mat, mat,255,Imgproc.ADAPTIVE_THRESH_GAUSSIAN_C,Imgproc.THRESH_BINARY,11,3);
+        Bitmap result = Bitmap.createBitmap(mat.cols(),mat.rows(),Bitmap.Config.ARGB_8888);
+        Utils.matToBitmap(mat, result);
+        mat.release();
+        return result;
+    }
+}