/// <summary>
/// Parallelized OCR Orientation Confidence Detector, this method will run ocr on
/// an image and its corresponding reversed images and return the confidence and
/// both the ocrdata objects
/// </summary>
/// <param name="regs">Images with default regular orientation</param>
/// <param name="revs">Images with reversed orientation to default</param>
/// <param name="mode">OCR accuracy mode</param>
/// <param name="lang">OCR languages</param>
/// <param name="enableTimer">Enable timer for diagnostic purposes</param>
/// <returns>Tuple containing confidence, regular ocrdata and reversed ocrdata.
/// Positive confidence is for Regular where as negative
/// confidences is for Reversed</returns>
public static Tuple<long, OcrData, OcrData>[] ParallelDetectOrientation(
Bitmap[] regs,
Bitmap[] revs,
Accuracy mode = Accuracy.High,
string lang = "eng",
bool enableTimer = false)
{
if (regs.Length != revs.Length)
{
throw new ArgumentException("Input Arrays must be same length!");
}
// create new array and copy over image references
int pivot = regs.Length;
Bitmap[] images = new Bitmap[regs.Length + revs.Length];
Array.Copy(regs, images, pivot);
Array.Copy(revs, 0, images, pivot, pivot);
// Run Parallel Recognition on the arrays
OcrData[] datas = ParallelRecognize(images, pivot + pivot, mode, lang, enableTimer);
// Extract results and calculate confidence
Tuple<long, OcrData, OcrData>[] results = new Tuple<long, OcrData, OcrData>[pivot];
for (int ii = 0; ii < pivot; ii++)
{
OcrData reg = datas[ii];
OcrData rev = datas[ii + pivot];
// If postive we are confident about the current orientation
// if negative we are not confident about the current orientation
long confidence = rev.Cost - reg.Cost;
results[ii] = new Tuple<long, OcrData, OcrData>(confidence, reg, rev);
}
return results;
}
/// <summary>
/// Parallelized Recognize Function takes in a list or array of images,
/// A specified length and for each image returns an OCRData object
/// </summary>
/// <param name="images"> Array or List of Bitmaps </param>
/// <param name="length"> Number of items to be Recognized from the array </param>
/// <param name="mode"> Accuracy Mode </param>
/// <param name="lang"> Desired OCR Language </param>
/// <param name="enableTimer"> Enables OCR Scan Timer if true </param>
/// <returns> </returns>
public static OcrData[] ParallelRecognize(IEnumerable<Bitmap> images,
int length,
Accuracy mode = Accuracy.High,
string lang = "eng",
bool enableTimer = false)
{
Tuple<int, Bitmap>[] indexedImages = new Tuple<int, Bitmap>[length];
int index = 0;
foreach (Bitmap image in images)
{
if (index >= length)
{
break;
}
indexedImages[index] = new Tuple<int, Bitmap>(index, image);
index += 1;
}
ConcurrentDictionary<int, OcrData> safeMap = new ConcurrentDictionary<int, OcrData>();
Parallel.ForEach(indexedImages, pair =>
{
int position = pair.Item1;
Bitmap image = pair.Item2;
safeMap[position] = Recognize(image, mode, lang, enableTimer);
});
OcrData[] data = new OcrData[length];
foreach (KeyValuePair<int, OcrData> kvpair in safeMap)
{
data[kvpair.Key] = kvpair.Value;
}
return data;
}
public static bool IsBetter(OcrData first, OcrData second)
{
return(first.Cost < second.Cost);
}
