static async Task GetTextFromImageAsync(ComputerVisionClient visionClient, string url)
{
BatchReadFileHeaders textHeaders = await visionClient.BatchReadFileAsync(url);
string operationLocation = textHeaders.OperationLocation;
int maxCharsInOperationId = 36;
string operationId = operationLocation.Substring(operationLocation.Length - maxCharsInOperationId);
int i = 0;
int maxRetries = 10;
ReadOperationResult results = null;
do
{
results = await visionClient.GetReadOperationResultAsync(operationId);
Console.WriteLine($"Статус сервера {results.Status}, выполняется {i} c");
await Task.Delay(1000);
if (i == 9)
{
Console.WriteLine("Сервер вызвал таймаут");
}
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries);
Console.WriteLine();
var textRecognitionResults = results.RecognitionResults;
foreach (TextRecognitionResult textRecognitionResult in results.RecognitionResults)
{
foreach (var line in textRecognitionResult.Lines)
{
Console.WriteLine(line.Text);
}
}
}
/*
* END - GENERATE THUMBNAIL
*/
// <snippet_extract_call>
/*
* BATCH READ FILE - URL IMAGE
* Recognizes handwritten text.
* This API call offers an improvement of results over the Recognize Text calls.
*/
public static async Task BatchReadFileUrl(ComputerVisionClient client, string urlImage)
{
Console.WriteLine("----------------------------------------------------------");
Console.WriteLine("BATCH READ FILE - URL IMAGE");
Console.WriteLine();
// Read text from URL
BatchReadFileHeaders textHeaders = await client.BatchReadFileAsync(urlImage);
// After the request, get the operation location (operation ID)
string operationLocation = textHeaders.OperationLocation;
// </snippet_extract_call>
// <snippet_extract_response>
// Retrieve the URI where the recognized text will be stored from the Operation-Location header.
// We only need the ID and not the full URL
const int numberOfCharsInOperationId = 36;
string operationId = operationLocation.Substring(operationLocation.Length - numberOfCharsInOperationId);
// Extract the text
// Delay is between iterations and tries a maximum of 10 times.
int i = 0;
int maxRetries = 10;
ReadOperationResult results;
Console.WriteLine($"Extracting text from URL image {Path.GetFileName(urlImage)}...");
Console.WriteLine();
do
{
results = await client.GetReadOperationResultAsync(operationId);
Console.WriteLine("Server status: {0}, waiting {1} seconds...", results.Status, i);
await Task.Delay(1000);
if (maxRetries == 9)
{
Console.WriteLine("Server timed out.");
}
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries);
// </snippet_extract_response>
// <snippet_extract_display>
// Display the found text.
Console.WriteLine();
var textRecognitionLocalFileResults = results.RecognitionResults;
foreach (TextRecognitionResult recResult in textRecognitionLocalFileResults)
{
foreach (Line line in recResult.Lines)
{
Console.WriteLine(line.Text);
}
}
Console.WriteLine();
}
private static async Task <string> ExtractRemoteTextAsync(ComputerVisionClient computerVision, string imageUrl)
{
if (!Uri.IsWellFormedUriString(imageUrl, UriKind.Absolute))
{
throw new Exception($"Invalid remoteImageUrl: {imageUrl}");
}
var textHeaders = await computerVision.BatchReadFileAsync(imageUrl);
return(await GetTextAsync(computerVision, textHeaders.OperationLocation));
}
// Read text from a remote image
private static async Task ExtractTextFromUrlAsync(ComputerVisionClient computerVision, string imageUrl, int numberOfCharsInOperationId, TextRecognitionMode textRecognitionMode)
{
if (!Uri.IsWellFormedUriString(imageUrl, UriKind.Absolute))
{
Console.WriteLine("\nInvalid remote image url:\n{0} \n", imageUrl);
return;
}
// Start the async process to read the text
BatchReadFileHeaders textHeaders = await computerVision.BatchReadFileAsync(imageUrl, textRecognitionMode);
await GetTextAsync(computerVision, textHeaders.OperationLocation, numberOfCharsInOperationId);
}
// public static ComputerVisionClient Authenticate(string endpoint, string key)
// {
// ComputerVisionClient client =
// new ComputerVisionClient(new ApiKeyServiceClientCredentials(key))
// { Endpoint = endpoint };
// return client;
// }
public async Task <List <string> > BatchReadFileUrl(ComputerVisionClient client, string urlImage)
{
String fullTextResultList = "";
// Read text from URL
var textHeaders = await client.BatchReadFileAsync(urlImage);
// After the request, get the operation location (operation ID)
string operationLocation = textHeaders.OperationLocation;
const int numberOfCharsInOperationId = 36;
string operationId = operationLocation.Substring(operationLocation.Length - numberOfCharsInOperationId);
// Extract the text
// Delay is between iterations and tries a maximum of 10 times.
int i = 0;
int maxRetries = 10;
ReadOperationResult results;
do
{
results = await client.GetReadOperationResultAsync(operationId);
Console.WriteLine("Server status: {0}, waiting {1} seconds...", results.Status, i);
await Task.Delay(1000);
if (i == 9)
{
Console.WriteLine("Server timed out.");
}
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries);
var textRecognitionLocalFileResults = results.RecognitionResults;
foreach (TextRecognitionResult recResult in textRecognitionLocalFileResults)
{
foreach (Line line in recResult.Lines)
{
fullTextResultList += line.Text + " ";
}
}
var cleanResults = resultCleanUp(fullTextResultList);
return(cleanResults);
}
public static async Task <string> ExtractText(ComputerVisionClient client, string urlImage)
{
// Read text from URL
BatchReadFileHeaders textHeaders = await client.BatchReadFileAsync(urlImage);
// After the request, get the operation location (operation ID)
string operationLocation = textHeaders.OperationLocation;
// Retrieve the URI where the recognized text will be stored from the Operation-Location header.
// We only need the ID and not the full URL
const int numberOfCharsInOperationId = 36;
string operationId = operationLocation.Substring(operationLocation.Length - numberOfCharsInOperationId);
// Extract the text
// Delay is between iterations and tries a maximum of 10 times.
int i = 0;
int maxRetries = 10;
ReadOperationResult results;
Console.WriteLine($"Extracting text from URL image {System.IO.Path.GetFileName(urlImage)}...");
Console.WriteLine();
do
{
results = await client.GetReadOperationResultAsync(operationId);
Console.WriteLine("Server status: {0}, waiting {1} seconds...", results.Status, i);
await Task.Delay(1000);
}while ((results.Status == TextOperationStatusCodes.Running ||
results.Status == TextOperationStatusCodes.NotStarted) && i++ < maxRetries);
// Display the found text.
Console.WriteLine();
var recognitionResults = results.RecognitionResults;
string content = string.Empty;
foreach (TextRecognitionResult result in recognitionResults)
{
foreach (Microsoft.Azure.CognitiveServices.Vision.ComputerVision.Models.Line line in result.Lines)
{
Console.WriteLine(line.Text);
content += line.Text + Environment.NewLine;
}
}
Console.WriteLine();
return(content);
}
// Read text from a remote image
private static async Task ExtractRemoteTextAsync(
ComputerVisionClient computerVision, string imageUrl)
{
if (!Uri.IsWellFormedUriString(imageUrl, UriKind.Absolute))
{
Console.WriteLine(
"\nInvalid remoteImageUrl:\n{0} \n", imageUrl);
return;
}
// Start the async process to read the text
BatchReadFileHeaders textHeaders =
await computerVision.BatchReadFileAsync(
imageUrl);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
public async Task <string> ScanDocumentAndGetResultsAsync(string documentUrl)
{
BatchReadFileHeaders batchReadFileHeaders = await _computerVisionClient.BatchReadFileAsync(documentUrl);
string operationId = GetScanOperationResultId(batchReadFileHeaders.OperationLocation);
var readOperationResult = await ReadDocumentScanResult(operationId);
StringBuilder sb = new StringBuilder();
foreach (var recognitionResult in readOperationResult.RecognitionResults)
{
foreach (var line in recognitionResult.Lines)
{
sb.AppendLine(line.Text);
}
}
return(sb.ToString());
}
public async Task ExtractText(string data, bool flag)
{
ComputerVisionClient computerVision = new ComputerVisionClient(new ApiKeyServiceClientCredentials(subscriptionKey), new System.Net.Http.DelegatingHandler[] { });
//Endpoint
computerVision.Endpoint = Endpoint;
if (flag)
{
if (!Uri.IsWellFormedUriString(data, UriKind.Absolute))
{
Error = "Invalid remoteImageUrl: " + data;
}
//Starting the async process to read the text
BatchReadFileHeaders textHeaders = await computerVision.BatchReadFileAsync(data, textRecognitionMode);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
else
{
//Image data to Byte Array
byte[] imageBytes = Convert.FromBase64String(data);
//Byte Array To Stream
Stream stream = new MemoryStream(imageBytes);
try
{
//Starting the async process to recognize the text
BatchReadFileInStreamHeaders textHeaders = await computerVision.BatchReadFileInStreamAsync(stream, textRecognitionMode);
await GetTextAsync(computerVision, textHeaders.OperationLocation);
}
catch (Exception e)
{
Error = e.Message;
}
}
}
public async Task <string> GetTextFromImage(string imageUrl)
{
var textHeaders = await client.BatchReadFileAsync(imageUrl, TextRecognitionMode.Handwritten);
return(await GetOcrResults(textHeaders.OperationLocation));
}
public async Task <ConvertResponse> ExtractTextBatchRead(ConvertResponse response)
{
try
{
var key = _config["computerVision:key"];
var endpoint = _config["computerVision:endpoint"];
ComputerVisionClient computerVision = new ComputerVisionClient(new ApiKeyServiceClientCredentials(key))
{
Endpoint = endpoint
};
var operationInfo = await computerVision.BatchReadFileAsync(response.Request.UploadBlobUrl + _config["storage:sas"]);
var result = new ReadOperationResult();
var operationId = operationInfo.OperationLocation.Split('/').Last();
while (result.Status != TextOperationStatusCodes.Failed && result.Status != TextOperationStatusCodes.Succeeded)
{
await Task.Delay(500);
result = await computerVision.GetReadOperationResultAsync(operationId);
}
if (result.Status == TextOperationStatusCodes.Failed)
{
response.ErrorMessage = $"Text translation failed.";
return(response);
}
var text = new StringBuilder();
foreach (var page in result.RecognitionResults)
{
Line lastLine = null;
foreach (var line in page.Lines)
{
// if (lastLine?.Words.Count >= 4)
// {
// text.Append($" {line.Text}");
// }
// else
// {
text.Append(Environment.NewLine + line.Text);
// }
lastLine = line;
}
}
Console.WriteLine();
Console.WriteLine(text.ToString());
var transcriptBlobName = Path.GetFileNameWithoutExtension(response.Request.BlobName) + ".txt";
var blobClient = new BlobStorageClient(_config);
var textBlob = blobClient.GetBlobBlock("transcripts", transcriptBlobName);
response.TranscriptBlobUrl = textBlob.Uri.AbsoluteUri;
response.Transcript = text.ToString().Trim();
await textBlob.UploadTextAsync(response.Transcript);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
Console.WriteLine(ex.Message);
response.ErrorMessage = ex.ToString();
}
return(response);
}
