Google Mobile Vision API未在肖像模式下检测文本

Question

我有一个活动，该活动使用fotoapparat库获取图片并将其保存到文件中。接下来，我使用Google Mobile Vision API创建该文件的位图并检测文本。我使用了为此提供的标准代码。

    TextRecognizer ocrFrame = new TextRecognizer.Builder(context).build();
    Frame frame = new Frame.Builder().setBitmap(BitmapFactory.decodeFile(pathToPhoto)).build();
    SparseArray<TextBlock> sparseTextBlocks = ocrFrame.detect(frame);
    if (sparseTextBlocks.size() <= 0)
        return null;
    ArrayList<TextBlock> textBlocks = new ArrayList<>();
    for (int i = 0; i < sparseTextBlocks.size(); i++) {
        textBlocks.add(sparseTextBlocks.get(sparseTextBlocks.keyAt(i)));
    }

OCR在景观模式下完美工作，但在肖像模式下，它几乎无法检测到任何文本。我已经通过显示图像在肖像模式下不倒的图像来验证。它提供了垂直图像。我真的不知道为什么会发生这种情况。有线索吗？

Answer 1

这是实现移动视觉API

的另一种选择

// imageBitmap is the Bitmap image you're trying to process for text
if(imageBitmap != 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(LOG_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(LOG_TAG, "Low Storage");
        }
    }

    Frame imageFrame = new Frame.Builder()
            .setBitmap(imageBitmap)
            .build();
    SparseArray<TextBlock> textBlocks = textRecognizer.detect(imageFrame);
    for (int i = 0; i < textBlocks.size(); i++) {
        TextBlock textBlock = textBlocks.get(textBlocks.keyAt(i));
        Log.i(LOG_TAG, textBlock.getValue()); 
        // Do something with value
    }
}

您需要确保在模块的构建中包含移动视觉依赖性

dependencies {
    compile 'com.google.android.gms:play-services-vision:9.4.0'
} 

，还将其包含在应用程序的Android清单

<meta-data
    android:name="com.google.android.gms.vision.DEPENDENCIES"
    android:value="ocr" />

总体而言，您的代码看起来不错，我认为这可能是您的库保存图片的方向可能与移动视觉API冲突的方式，请尝试在附带项目或其他库中使用本机Android捕获，如果您的应用程序仍然不在努力尝试将静止的景观保存在景观中，即使它们是在肖像画上也可以帮助的

希望它有帮助