android – 谷歌手机Vision Text API示例

我目前正在编写应该能够查看文本图片的代码,然后从基于Android的设备的图片中提取文本.我在网上进行了一些研究,发现Google提供了自己的API,名为“Mobile Vision”(包含许多项目的包,即文本识别,面部识别等).然而,在他们的演示中,他们只展示实时文本识别.我想知道是否有人可以使用Mobile Vision API给我一个静止图像上的文本识别示例.欢迎任何帮助.谢谢.

解决方法:

Google Play服务移动视觉API文档介绍了如何执行此操作,您可以使用TextRecognizer类检测Frames中的文本.一旦获得了位图图像,就可以将其转换为框架并对其进行处理.请参阅下面的示例.

// 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
    }
}

您还需要确保在模块的build.gradle中包含移动视觉依赖项

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

并且还在应用程序的Android Manifest中包含以下内容

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

标签：android,android-vision,text-recognition
来源： https://codeday.me/bug/20190928/1827268.html