// SoftwareBitmap を OCR に掛ける
private async Task RecognizeBitmapAsync(UwpSoftwareBitmap bitmap)
{
this.RecognizedTextTextBox.Text = string.Empty;
var ocrEngine = UwpOcrEngine.TryCreateFromLanguage(this.LangComboBox.SelectedItem as UwpLanguage);
UwpOcrResult ocrResult = await ocrEngine.RecognizeAsync(bitmap);
foreach (var ocrLine in ocrResult.Lines)
{
this.RecognizedTextTextBox.Text += (ocrLine.Text + "\n");
}
}
public void SetOcrLanguage(string language)
{
OcrLanguages langus = new OcrLanguages();
string tag = langus.GetTag(language);
ocrLanguage = new UwpLanguage(tag);
engine = UwpOcrEngine.TryCreateFromLanguage(ocrLanguage);
if (engine == null)
{
ocrLanguage = null;
throw new InvalidOperationException(errMsgFailedToSetLanguage);
}
}
public WindowsOCR()
{
// Engine を既定の言語で初期化する。
engine = UwpOcrEngine.TryCreateFromUserProfileLanguages();
if (engine == null)
{
throw new InvalidOperationException(errMsgFailedToConstract);
}
// Propertyの初期化
ocrLanguage = new UwpLanguage(engine.RecognizerLanguage.LanguageTag);
ocrAngle = 0.0;
ocrResults = new List <WinOcrResult>();
}
private async void MainWindow_Loaded(object sender, RoutedEventArgs ea)
{
setLanguageList();
bool hasCamera = await setCameraListAsync();
if (hasCamera)
{
await InitializeMediaCaptureAsync();
setBrightnessControl();
initializeTimer();
}
return;
#region local functions in MainWindow_Loaded
void setLanguageList()
{
IReadOnlyList <UwpLanguage> langList = UwpOcrEngine.AvailableRecognizerLanguages;
this.LangComboBox.ItemsSource = langList;
this.LangComboBox.DisplayMemberPath = nameof(UwpLanguage.DisplayName);
this.LangComboBox.SelectedValuePath = nameof(UwpLanguage.LanguageTag);
var ocrEngine
= UwpOcrEngine.TryCreateFromUserProfileLanguages();
this.LangComboBox.SelectedValue = ocrEngine.RecognizerLanguage.LanguageTag;
}
async Task <bool> setCameraListAsync()
{
var devices = await UwpDeviceInformation.FindAllAsync(UwpDeviceClass.VideoCapture);
if (devices.Count == 0)
{
hideCameraUI();
return(false);
}
setupCameraComboBox(devices);
return(true);
void hideCameraUI()
{
this.CameraLabel.Visibility = Visibility.Collapsed;
this.CameraComboBox.Visibility = Visibility.Collapsed;
this.MonitorCameraButton.Visibility = Visibility.Collapsed;
this.CameraControlGrid.Visibility = Visibility.Collapsed;
this.OcrCameraButtan.Visibility = Visibility.Collapsed;
}
void setupCameraComboBox(IReadOnlyList <UwpDeviceInformation> deviceList)
{
this.CameraComboBox.ItemsSource = deviceList;
this.CameraComboBox.DisplayMemberPath = nameof(UwpDeviceInformation.Name);
this.CameraComboBox.SelectedValuePath = nameof(UwpDeviceInformation.Id);
this.CameraComboBox.SelectedIndex = 0;
}
}
void setBrightnessControl()
{
// [明るさ] スライダーを設定
var brightCtl = _mediaCapture.BrightnessControl;
this.BrightSlider.Minimum = brightCtl.Capabilities.Min;
this.BrightSlider.Maximum = brightCtl.Capabilities.Max;
if (brightCtl.TryGetValue(out double bright))
{
this.BrightSlider.Value = bright;
}
// [コントラスト] スライダーを設定
var contrastCtl = _mediaCapture.ContrastControl;
this.ContrastSlider.Minimum = contrastCtl.Capabilities.Min;
this.ContrastSlider.Maximum = contrastCtl.Capabilities.Max;
if (contrastCtl.TryGetValue(out double contrast))
{
this.ContrastSlider.Value = contrast;
}
}
void initializeTimer()
{
// CapturePhotoToStreamAsync() が、どうも毎秒1回程度しかキャプチャさせてくれないようだ。
// タイマー動作にする必要はなかったかもしれない。
_dispatcherTimer = new DispatcherTimer(DispatcherPriority.Normal)
{
Interval = TimeSpan.FromMilliseconds(333),
};
_dispatcherTimer.Tick += new EventHandler(OnTimerTickAsync);
_dispatcherTimer.Start();
}
#endregion
} // END MainWindow_Loaded
