我正在尝试开发一个从屏幕截图中提取文本的应用程序，并使用这些数据（数字和文本）做一些事情。它有效，但不像我预期的那样，它根本不准确。奇怪的是，我的应用程序和google vision api 网站上的“try api”以不同的方式识别相同分辨率的相同屏幕截图
例如：我的应用程序将带有“410”作为文本的屏幕截图识别为“A10”。否则 google api 站点正确识别 410
我注意到 google Keep OCR 比我的应用更好，它使用相同的 api？作为 google Keep 或 google vison api 站点，我可以做些什么来改善我的应用程序中的文本识别？
这是我的代码：
ocr类
public class Ocr extends AppCompatActivity {
private static int RESULT_LOAD_IMAGE = 1;
String TAG = "MAIN ACTIVITY";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonLoadImage = (Button) findViewById(R.id.upload_btn);
buttonLoadImage.setOnClickListener(new View.OnClickListener() {
/**
* on click method of the upload button
* @param arg0
*/
@Override
public void onClick(View arg0) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
}
/**
* In this method, we check if the activity that was triggered was indeed Image Gallery
* (It is common to trigger different intents from the same activity and expects result from each).
* For this we used RESULT_LOAD_IMAGE integer that we passed previously to startActivityForResult() method
* @param requestCode
* @param resultCode
* @param data
*/
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri uri = data.getData();
try {
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
ImageView imageView = (ImageView) findViewById(R.id.imgView);
imageView.setImageBitmap(bitmap);
// imageBitmap is the Bitmap image you're trying to process for text
if (bitmap != null) {
TextRecognizer textRecognizer = new TextRecognizer.Builder(this).build();
if (!textRecognizer.isOperational()) {
// Note: The first time that an app using a Vision API is installed on a
// device, GMS will download a native libraries to the device in order to do detection.
// Usually this completes before the app is run for the first time. But if that
// download has not yet completed, then the above call will not detect any text,
// barcodes, or faces.
// isOperational() can be used to check if the required native libraries are currently
// available. The detectors will automatically become operational once the library
// downloads complete on device.
Log.w(TAG, "Detector dependencies are not yet available.");
// Check for low storage. If there is low storage, the native library will not be
// downloaded, so detection will not become operational.
IntentFilter lowstorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW);
boolean hasLowStorage = registerReceiver(null, lowstorageFilter) != null;
if (hasLowStorage) {
Toast.makeText(this, "Low Storage", Toast.LENGTH_LONG).show();
Log.w(TAG, "Low Storage");
}
}
Frame imageFrame = new Frame.Builder()
.setBitmap(bitmap)
.build();
SparseArray<TextBlock> textBlocks = textRecognizer.detect(imageFrame);
for (int i = 0; i < textBlocks.size(); i++) {
TextBlock textBlock = textBlocks.get(textBlocks.keyAt(i));
String text = textBlock.getValue();
Toast.makeText(this, text , Toast.LENGTH_SHORT).show();
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
安卓清单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.prova.ocr">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.gms.vision.DEPENDENCIES"
android:value="ocr" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
摇篮
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.1"
defaultConfig {
applicationId "com.prova.ocr"
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.0.1'
testCompile 'junit:junit:4.12'
compile 'com.android.support:support-v4:25.0.1'
compile 'com.android.support:design:25.0.1'
compile 'com.google.android.gms:play-services-vision:10.0.0+'
}