最適なパフォーマンスを実現する C#35 での高速 OCR 構成

using IronOcr;
using System;
using System.Diagnostics;
using System.IO;

// --- Tesseract Engine Setup ---
var ocrTesseract = new IronTesseract();
ocrTesseract.Language = OcrLanguage.EnglishFast;
ocrTesseract.Configuration.ReadBarCodes = false;
ocrTesseract.Configuration.PageSegmentationMode = TesseractPageSegmentationMode.Auto;

// --- 1. Define folder and get files ---
string folderPath = @"images"; // IMPORTANT: Set this to your image directory
string filePattern = "*.png";    // Change to "*.jpg", "*.bmp", etc. as needed
string outputFilePath = "ocr_results.txt"; // The new results file

// Get all image files in the directory
var imageFiles = Directory.GetFiles(folderPath, filePattern);

Console.WriteLine($"Found {imageFiles.Length} total images to process...");
Console.WriteLine($"Results will be written to: {outputFilePath}");

// --- 2. Start timer and process images, writing to file ---
// Open the output file *before* the loop for efficiency
using (StreamWriter writer = new StreamWriter(outputFilePath))
{
    var stopwatch = Stopwatch.StartNew();

    foreach (var file in imageFiles)
    {
        string fileName = Path.GetFileName(file);

        using var ocrInput = new OcrInput();
        ocrInput.LoadImage(file);

        var ocrResult = ocrTesseract.Read(ocrInput);

        // Check if any text was actually found
        if (!string.IsNullOrEmpty(ocrResult.Text))
        {
            // Write to Console
            Console.WriteLine($"--- Text found in: {fileName} ---");
            Console.WriteLine(ocrResult.Text.Trim());
            Console.WriteLine("------------------------------------------");

            // Write to File
            writer.WriteLine($"--- Text found in: {fileName} ---");
            writer.WriteLine(ocrResult.Text.Trim());
            writer.WriteLine("------------------------------------------");
            writer.WriteLine(); // Add a blank line for readability
        }
        else
        {
            // Write to Console
            Console.WriteLine($"No text found in: {fileName}");

            // Write to File
            writer.WriteLine($"No text found in: {fileName}");
            writer.WriteLine();
        }
    }

    stopwatch.Stop();

    // --- 3. Print and write final benchmark summary ---
    string lineSeparator = "\n========================================";
    string title = "Batch OCR Processing Complete";
    string summary = $"Fast configuration took {stopwatch.Elapsed.TotalSeconds:F2} seconds";

    // Write summary to Console
    Console.WriteLine(lineSeparator);
    Console.WriteLine(title);
    Console.WriteLine("========================================");
    Console.WriteLine(summary);

    // Write summary to File
    writer.WriteLine(lineSeparator);
    writer.WriteLine(title);
    writer.WriteLine("========================================");
    writer.WriteLine(summary);

    if (imageFiles.Length > 0)
    {
        string avgTime = $"Average time per image: {(stopwatch.Elapsed.TotalSeconds / (double)imageFiles.Length):F3} seconds";
        Console.WriteLine(avgTime);
        writer.WriteLine(avgTime);
    }
}

Console.WriteLine($"\nSuccessfully saved results to {outputFilePath}");