Question

我正在使用以下方法来检测图像中的文本。但是，一次执行此方法将在我的Azure仪表板中产生9个事务。如果我缺少什么可以请人指导吗？还是代码有什么问题？

public async Task<IActionResult> ConvertToText(string url)
        {
            string subscriptionKey = "jfh3879rhf4389terhkjy86";

            ComputerVisionClient computerVision = new ComputerVisionClient(
                new ApiKeyServiceClientCredentials(subscriptionKey),
                new System.Net.Http.DelegatingHandler[] { });

            // Specify the Azure region
            computerVision.Endpoint = "https://westcentralus.api.cognitive.microsoft.com";


            if (!Uri.IsWellFormedUriString(url, UriKind.Absolute))
            {
                return null;
            }

            TextRecognitionMode textRecognitionMode = TextRecognitionMode.Printed;
            int numberOfCharsInOperationId = 36;

            // Start the async process to recognize the text
            RecognizeTextHeaders textHeaders =
                await computerVision.RecognizeTextAsync(url, textRecognitionMode);

            // Retrieve the URI where the recognized text will be
            // stored from the Operation-Location header
            string operationId = textHeaders.OperationLocation.Substring(
                textHeaders.OperationLocation.Length - numberOfCharsInOperationId);

            TextOperationResult result =
                await computerVision.GetTextOperationResultAsync(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.GetTextOperationResultAsync(operationId);
            }

            // Display the results
            var lines = result.RecognitionResult.Lines;
            string details = "";

            foreach (Line line in lines)
            {
                details += line.Text + Environment.NewLine;
            }

            return Content(details);
        }

谢谢。

Answer 1

取自Cognitive Services pricing page：

什么是计算机视觉API的交易？
对于“识别文本”，每个POST调用都计为一个事务。用于查看异步服务结果的所有GET调用均计为事务，但免费。

我的猜测是，“问题”处于while语句中，因为您正在（可能）仍在运行作业时获得结果。在完成工作之前，您可能已经获得了几次状态。好东西：这些API调用是免费的。

我看到您的代码与Quickstart: Extract text using the Computer Vision SDK and C#中的代码相同，因此应该可以。

Azure认知服务-Vision API一次调用导致9笔交易

1 个答案: