public void Transform(ScaleTransform scale)
{
// Scale word box bounding rect and update properties.
UpdateProps(scale.TransformBounds(word.BoundingRect));
}
/// <summary>
/// This is click handler for Extract Text button.
/// If image size is supported text is extracted and overlaid over displayed image.
/// Supported image dimensions are between 40 and 2600 pixels.
/// </summary>
private async void ExtractTextButton_Click(object sender, RoutedEventArgs e)
{
// Prevent another OCR request, since only image can be processed at the time at same OCR engine instance.
ExtractTextButton.IsEnabled = false;
// Check whether is loaded image supported for processing.
// Supported image dimensions are between 40 and 2600 pixels.
if (bitmap.PixelHeight < 40 ||
bitmap.PixelHeight > 2600 ||
bitmap.PixelWidth < 40 ||
bitmap.PixelWidth > 2600)
{
ImageText.Text = "Resim Boyutu Desteklenmiyor." +
Environment.NewLine +
"Seçilen resim Boyutu " + bitmap.PixelWidth + "x" + bitmap.PixelHeight + "." +
Environment.NewLine +
" 40 ve 2600 pixels Resim Boyutları Desteklenmektedir.";
ImageText.Style = (Style)Application.Current.Resources["RedTextStyle"];
rootPage.NotifyUser(
String.Format("Desteklenmeyen Görüntü Boyutu. " +
Environment.NewLine +
"Desteklenen dosya boyutu 40 ve 2600 pixel aralığıdır."),
NotifyType.ErrorMessage);
return;
}
// This main API call to extract text from image.
var ocrResult = await ocrEngine.RecognizeAsync((uint)bitmap.PixelHeight, (uint)bitmap.PixelWidth, bitmap.PixelBuffer.ToArray());
// OCR result does not contain any lines, no text was recognized.
if (ocrResult.Lines != null)
{
// Used for text overlay.
// Prepare scale transform for words since image is not displayed in original format.
var scaleTrasform = new ScaleTransform
{
CenterX = 0,
CenterY = 0,
ScaleX = PreviewImage.ActualWidth / bitmap.PixelWidth,
ScaleY = PreviewImage.ActualHeight / bitmap.PixelHeight,
};
if (ocrResult.TextAngle != null)
{
// If text is detected under some angle then
// apply a transform rotate on image around center.
PreviewImage.RenderTransform = new RotateTransform
{
Angle = (double)ocrResult.TextAngle,
CenterX = PreviewImage.ActualWidth / 2,
CenterY = PreviewImage.ActualHeight / 2
};
}
string extractedText = "";
// Iterate over recognized lines of text.
foreach (var line in ocrResult.Lines)
{
// Iterate over words in line.
foreach (var word in line.Words)
{
var originalRect = new Rect(word.Left, word.Top, word.Width, word.Height);
var overlayRect = scaleTrasform.TransformBounds(originalRect);
// Define the TextBlock.
var wordTextBlock = new TextBlock()
{
Height = overlayRect.Height,
Width = overlayRect.Width,
FontSize = overlayRect.Height * 0.8,
Text = word.Text,
Style = (Style)Application.Current.Resources["ExtractedWordTextStyle"]
};
// Define position, background, etc.
var border = new Border()
{
Margin = new Thickness(overlayRect.Left, overlayRect.Top, 0, 0),
Height = overlayRect.Height,
Width = overlayRect.Width,
Child = wordTextBlock,
Style = (Style)Application.Current.Resources["ExtractedWordBorderStyle"]
};
// Put the filled textblock in the results grid.
TextOverlay.Children.Add(border);
extractedText += word.Text + " ";
}
extractedText += Environment.NewLine;
}
ImageText.Text = extractedText;
ImageText.Style = (Style)Application.Current.Resources["GreenTextStyle"];
ImageTextbox.Text = extractedText;
}
else
{
ImageText.Text = "Metin Yok.";
ImageText.Style = (Style)Application.Current.Resources["RedTextStyle"];
}
rootPage.NotifyUser(
String.Format("Görüntü Başarıyla {0} Dilinde Okundu.", ocrEngine.Language.ToString()),
NotifyType.StatusMessage);
}
private async void ExtractText_Click(object sender, RoutedEventArgs e)
{
//// Prevent another OCR request, since only image can be processed at the time at same OCR engine instance.
//ExtractTextButton.IsEnabled = false;
// Check whether is loaded image supported for processing.
// Supported image dimensions are between 40 and 2600 pixels.
if (bitmap.PixelHeight < 40 ||
bitmap.PixelHeight > 2600 ||
bitmap.PixelWidth < 40 ||
bitmap.PixelWidth > 2600)
{
ImageText.Text = "Image size is not supported." +
Environment.NewLine +
"Loaded image size is " + bitmap.PixelWidth + "x" + bitmap.PixelHeight + "." +
Environment.NewLine +
"Supported image dimensions are between 40 and 2600 pixels.";
return;
}
// This main API call to extract text from image.
var ocrResult = await ocrEngine.RecognizeAsync((uint)bitmap.PixelHeight, (uint)bitmap.PixelWidth, bitmap.PixelBuffer.ToArray());
// OCR result does not contain any lines, no text was recognized.
if (ocrResult.Lines != null)
{
// Used for text overlay.
// Prepare scale transform for words since image is not displayed in original format.
var scaleTrasform = new ScaleTransform
{
CenterX = 0,
CenterY = 0,
ScaleX = PreviewImage.ActualWidth / bitmap.PixelWidth,
ScaleY = PreviewImage.ActualHeight / bitmap.PixelHeight,
};
if (ocrResult.TextAngle != null)
{
PreviewImage.RenderTransform = new RotateTransform
{
Angle = (double)ocrResult.TextAngle,
CenterX = PreviewImage.ActualWidth / 2,
CenterY = PreviewImage.ActualHeight / 2
};
}
string extractedText = "";
// Iterate over recognized lines of text.
foreach (var line in ocrResult.Lines)
{
// Iterate over words in line.
foreach (var word in line.Words)
{
var originalRect = new Rect(word.Left, word.Top, word.Width, word.Height);
var overlayRect = scaleTrasform.TransformBounds(originalRect);
var wordTextBlock = new TextBlock()
{
Height = overlayRect.Height,
Width = overlayRect.Width,
FontSize = overlayRect.Height * 0.8,
Text = word.Text,
};
// Define position, background, etc.
var border = new Border()
{
Margin = new Thickness(overlayRect.Left, overlayRect.Top, 0, 0),
Height = overlayRect.Height,
Width = overlayRect.Width,
Background = new SolidColorBrush(Colors.Orange),
Opacity = 0.5,
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Top,
Child = wordTextBlock,
};
OverlayTextButton.IsEnabled = true;
// Put the filled textblock in the results grid.
TextOverlay.Children.Add(border);
extractedText += word.Text + " ";
}
extractedText += Environment.NewLine;
}
ImageText.Text = extractedText;
}
else
{
ImageText.Text = "No text.";
}
}
