private async Task <GoogleOcrResult> DoOcr(Stream imageAsStream, FileFormatEnum fileFormatEnum, DateTime start)
{
try
{
var preprocessedResult = _ocrPreProcessing.AjustOrientationAndSize(imageAsStream, fileFormatEnum);
using (var stream = preprocessedResult.ImageFileStream)
{
var builder = new ImageAnnotatorClientBuilder {
JsonCredentials = File.ReadAllText(_configurations.CredentialsJsonFile)
};
var client = await builder.BuildAsync();
var img = await Image.FromStreamAsync(stream);
var textAnnotations = await client.DetectTextAsync(img);
var rawGoogleOcrResult = RawGoogleOcrResult.CreateFrom(textAnnotations.ToList());
var content = _googleOcrParser.Execute(rawGoogleOcrResult, preprocessedResult.NewImageHeight,
preprocessedResult.NewImageWidth);
return(GoogleOcrResult.CreateSuccessResult(DateTime.Now.Subtract(start), content, rawGoogleOcrResult));
}
}
catch (Exception e)
{
return(GoogleOcrResult.CreateErrorResult(DateTime.Now.Subtract(start), e));
}
}
/// <summary>
/// Async method to load the image, call google's vision API and format the result into an easy to use format.
/// Prior to calling the API, this method will compress the image if to large for the API service, and will rotate it according to the EXIF orientation.
/// </summary>
/// <param name="filePath">File path</param>
/// <param name="fileFormatEnum">The image format. Needed for compression.</param>
/// <returns></returns>
public async Task <GoogleOcrResult> OcrImage(string filePath, FileFormatEnum fileFormatEnum)
{
var start = DateTime.Now;
try
{
if (!File.Exists(filePath))
{
throw new FileNotFoundException("", filePath);
}
using (var stream = File.OpenRead(filePath))
{
return(await DoOcr(stream, fileFormatEnum, start));
}
}
catch (Exception e)
{
return(GoogleOcrResult.CreateErrorResult(DateTime.Now.Subtract(start), e));
}
}
private async Task <GoogleOcrResult> DoOcr(Stream imageAsStream, FileFormatEnum fileFormatEnum, DateTime start)
{
try
{
var preprocessedResult = _ocrPreProcessing.AjustOrientationAndSize(imageAsStream, fileFormatEnum);
using (var stream = preprocessedResult.ImageFileStream)
{
using (var service = VisionService())
{
var entries = await service.RecognizeTextAsync(stream);
var rawGoogleOcrResult = RawGoogleOcrResult.CreateFrom(entries);
var content = _googleOcrParser.Execute(rawGoogleOcrResult, preprocessedResult.NewImageHeight,
preprocessedResult.NewImageWidth);
return(GoogleOcrResult.CreateSuccessResult(DateTime.Now.Subtract(start), content, rawGoogleOcrResult));
}
}
}
catch (Exception e)
{
return(GoogleOcrResult.CreateErrorResult(DateTime.Now.Subtract(start), e));
}
}
