/// <summary>
/// Detects the page orientation, with corresponding confidence when using <see cref="PageSegMode.OsdOnly"/>.
/// </summary>
/// <remarks>
/// If using full page segmentation mode (i.e. AutoOsd) then consider using <see cref="AnalyseLayout"/> instead as this also provides a
/// deskew angle which isn't available when just performing orientation detection.
/// </remarks>
/// <param name="orientation">The detected clockwise page rotation in degrees (0, 90, 180, or 270).</param>
/// <param name="confidence">The confidence level of the orientation (15 is reasonably confident).</param>
/// <param name="scriptName">The name of the script (e.g. Latin)<param>
/// <param name="scriptConfidence">The confidence level in the script</param>
public void DetectBestOrientationAndScript(out int orientation, out float confidence, out string scriptName, out float scriptConfidence)
{
int orient_deg;
float orient_conf;
IntPtr script_nameHandle;
float script_conf;
if (Interop.TessApi.Native.TessBaseAPIDetectOrientationScript(Engine.Handle, out orient_deg, out orient_conf, out script_nameHandle, out script_conf) != 0)
{
orientation = orient_deg;
confidence = orient_conf;
if (script_nameHandle != IntPtr.Zero)
{
scriptName = MarshalHelper.PtrToString(script_nameHandle, Encoding.ASCII);
// Don't delete script_nameHandle as it points to internal memory managed by Tesseract.
}
else
{
scriptName = null;
}
scriptConfidence = script_conf;
}
else
{
throw new TesseractException("Failed to detect image orientation.");
}
}
public FontAttributes GetWordFontAttributes()
{
VerifyNotDisposed();
if (handle.Handle == IntPtr.Zero)
{
return(null);
}
bool isBold, isItalic, isUnderlined, isMonospace, isSerif, isSmallCaps;
int pointSize, fontId;
// per docs (ltrresultiterator.h:104 as of 4897796 in github:tesseract-ocr/tesseract)
// this return value points to an internal table and should not be deleted.
IntPtr nameHandle =
Interop.TessApi.Native.ResultIteratorWordFontAttributes(
handle,
out isBold, out isItalic, out isUnderlined,
out isMonospace, out isSerif, out isSmallCaps,
out pointSize, out fontId);
// This can happen in certain error conditions
if (nameHandle == IntPtr.Zero)
{
return(null);
}
FontInfo fontInfo;
if (!_fontInfoCache.TryGetValue(fontId, out fontInfo))
{
string fontName = MarshalHelper.PtrToString(nameHandle, Encoding.UTF8);
fontInfo = new FontInfo(fontName, fontId, isItalic, isBold, isMonospace, isSerif);
_fontInfoCache.Add(fontId, fontInfo);
}
return(new FontAttributes(fontInfo, isUnderlined, isSmallCaps, pointSize));
}