flutter - 实时文本识别(感兴趣区域)

Question

我有实时文本识别我使用了图书馆https://pub.dev/packages/google_mlkit_text_recognition和 https://pub.dev/packages/camera ,但我有一些问题...

我只需要检测标记部分的文本...

获取实时预览功能:// future _processCameraImage(CameraImage 图像)异步 {final WriteBuffer allBytes = WriteBuffer();对于(image.planes 中的最终平面){allBytes.putUint8List(plane.bytes);}final bytes = allBytes.done().buffer.asUint8List();

final Size imageSize =
    Size(image.width.toDouble(), image.height.toDouble());
//
final camera = cameras[_cameraIndex];
final imageRotation =
    InputImageRotationValue.fromRawValue(camera.sensorOrientation) ??
        InputImageRotation.rotation0deg;

final inputImageFormat =
    InputImageFormatValue.fromRawValue(image.format.raw) ??
        InputImageFormat.nv21;

final planeData = image.planes.map(
  (Plane plane) {
    return InputImagePlaneMetadata(
      bytesPerRow: plane.bytesPerRow,
      height: plane.height,
      width: plane.width,
    );
  },
).toList();
//
final inputImageData = InputImageData(
  size: imageSize,
  imageRotation: imageRotation,
  inputImageFormat: inputImageFormat,
  planeData: planeData,
);

final inputImage =
    InputImage.fromBytes(bytes: bytes, inputImageData: inputImageData);
//
widget.onImage(inputImage);
}

处理图像函数://

  Future<void> processImage(InputImage inputImage) async {
  if (!_canProcess) return;
  if (_isBusy) return;
  _isBusy = true;

  final recognizedText = await _textRecognizer.processImage(inputImage);
  //


  if (mounted) {
   for (var element in recognizedText.blocks) {
     for (var line in element.lines) {
       for (var txt in line.elements) {
         if (txt.text.length == 17) {
           setState(() {
             _text = txt.text;
           });
         }
       }
     }
   }
 }
  _isBusy = false;
}
}

Answer 1

我有一个类似的任务，我使用了模块 mask_for_camera_view

创建自己的框架并找到裁剪图片的值

github 中有更多详细信息和照片示例