// Recognize text from a local image
private async Task ExtractLocalTextAsync(
ComputerVisionClient computerVision, string imagePath)
{
if (!File.Exists(imagePath))
{
Console.WriteLine(
"\nUnable to open or read localImagePath:\n{0} \n", imagePath);
return;
}
using (Stream imageStream = File.OpenRead(imagePath))
{
// Start the async process to recognize the text
try
{
BatchReadFileInStreamHeaders textHeaders =
await computerVision.BatchReadFileInStreamAsync(
imageStream, textRecognitionMode);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
catch (Exception err)
{
Global.ProcessStatus = ProcessStatus.Error.ToString();
//Thread.Sleep(100);
OnReadDone?.Invoke(err, EventArgs.Empty);
}
}
//DO FILTER
}
// Retrieve the recognized text
private async Task GetTextAsync(
ComputerVisionClient computerVision, string operationLocation)
{
try
{
// Retrieve the URI where the recognized text will be
// stored from the Operation-Location header
string operationId = operationLocation.Substring(
operationLocation.Length - numberOfCharsInOperationId);
Console.WriteLine("\nCalling GetReadOperationResultAsync()");
ReadOperationResult result =
await computerVision.GetReadOperationResultAsync(operationId);
// Wait for the operation to complete
int i = 0;
int maxRetries = 10;
while ((result.Status == TextOperationStatusCodes.Running ||
result.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries)
{
Console.WriteLine(
"Server status: {0}, waiting {1} seconds...", result.Status, i);
await Task.Delay(1000);
result = await computerVision.GetReadOperationResultAsync(operationId);
}
// Display the results
Console.WriteLine();
var recResults = result.RecognitionResults;
int lineNo = 0;
foreach (TextRecognitionResult recResult in recResults)
{
foreach (Line line in recResult.Lines)
{
lineNo += 1;
Console.WriteLine(line.Text);
BaiOcrLine ocr = new BaiOcrLine
{
LineNo = lineNo,
Content = line.Text
};
RawList.Add(ocr);
}
}
Console.WriteLine();
Global.ProcessStatus = ProcessStatus.Ready.ToString();
OnReadDone?.Invoke(this, EventArgs.Empty);
}
catch (Exception err)
{
throw err;
}
}