Migrating from Google Cloud Vision OCR to IronOCR

// PaddleSharp: Backend selection sprawls into application startup
// Simplified — see Sdcb.PaddleInference documentation for full API
using Sdcb.PaddleInference;
using Sdcb.PaddleOCR;

// CPU-only deployment
var config = PaddleConfig.FromModelDir("models/det");
config.SetCpuMathLibraryNumThreads(4);

// GPU deployment — different package, different init path
// var config = PaddleConfig.FromModelDir("models/det");
// config.EnableGpu(500, 0);  // memoryMB, deviceId

// OpenVINO deployment — third conditional branch
// config.EnableMkldnn();

// Application code now owns the hardware topology decision

Imports Sdcb.PaddleInference
Imports Sdcb.PaddleOCR

' PaddleSharp: Backend selection sprawls into application startup
' Simplified — see Sdcb.PaddleInference documentation for full API

' CPU-only deployment
Dim config = PaddleConfig.FromModelDir("models/det")
config.SetCpuMathLibraryNumThreads(4)

' GPU deployment — different package, different init path
' Dim config = PaddleConfig.FromModelDir("models/det")
' config.EnableGpu(500, 0)  ' memoryMB, deviceId

' OpenVINO deployment — third conditional branch
' config.EnableMkldnn()

' Application code now owns the hardware topology decision

// IronOCR: なし backend selection. なし config objects. Zero hardware decisions.
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

var result = new IronTesseract().Read("document.jpg");
Console.WriteLine(result.Text);
// Runs on CPU, Linux, Docker, or ARM without a code change

Imports IronOcr

' IronOCR: なし backend selection. なし config objects. Zero hardware decisions.
IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY"

Dim result = New IronTesseract().Read("document.jpg")
Console.WriteLine(result.Text)
' Runs on CPU, Linux, Docker, or ARM without a code change

dotnet remove package Sdcb.PaddleOCR
dotnet remove package Sdcb.PaddleInference
dotnet remove package OpenCvSharp4
dotnet remove package OpenCvSharp4.runtime.win

// Before (PaddleSharp)
using Sdcb.PaddleOCR;
using Sdcb.PaddleOCR.Models;
using Sdcb.PaddleInference;
using OpenCvSharp;

// After (IronOCR)
using IronOcr;

Imports IronOcr

IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY";

IronOcr.License.LicenseKey = "YOUR-LICENSE-KEY"

// Simplified — see Sdcb.PaddleOCR documentation for full API
using Sdcb.PaddleOCR;
using Sdcb.PaddleOCR.Models;
using OpenCvSharp;
using Microsoft.Extensions.DependencyInjection;

// Expensive: loads 3 model files from disk on construction (~300–800ms)
public class PaddleOcrEngine : IDisposable
{
    private readonly PaddleOcrAll _ocr;
    private bool _disposed;

    public PaddleOcrEngine()
    {
        var detModel = LocalFullModels.ChineseV3.DetectionModel;
        var clsModel = LocalFullModels.ChineseV3.ClassifierModel;
        var recModel = LocalFullModels.ChineseV3.RecognitionModel;

        // Must be singleton — cannot afford per-request construction
        _ocr = new PaddleOcrAll(detModel, clsModel, recModel);
    }

    public string Read(string imagePath)
    {
        using var mat = Cv2.ImRead(imagePath); // OpenCV required even for a file path
        var result = _ocr.Run(mat);
        return string.Join(" ", result.Regions.Select(r => r.Text));
    }

    public void Dispose()
    {
        if (!_disposed)
        {
            _ocr?.Dispose();
            _disposed = true;
        }
    }
}

// Startup.cs — forced singleton because of construction cost
services.AddSingleton<PaddleOcrEngine>();

Imports Sdcb.PaddleOCR
Imports Sdcb.PaddleOCR.Models
Imports OpenCvSharp
Imports Microsoft.Extensions.DependencyInjection

' Expensive: loads 3 model files from disk on construction (~300–800ms)
Public Class PaddleOcrEngine
    Implements IDisposable

    Private ReadOnly _ocr As PaddleOcrAll
    Private _disposed As Boolean

    Public Sub New()
        Dim detModel = LocalFullModels.ChineseV3.DetectionModel
        Dim clsModel = LocalFullModels.ChineseV3.ClassifierModel
        Dim recModel = LocalFullModels.ChineseV3.RecognitionModel

        ' Must be singleton — cannot afford per-request construction
        _ocr = New PaddleOcrAll(detModel, clsModel, recModel)
    End Sub

    Public Function Read(imagePath As String) As String
        Using mat = Cv2.ImRead(imagePath) ' OpenCV required even for a file path
            Dim result = _ocr.Run(mat)
            Return String.Join(" ", result.Regions.Select(Function(r) r.Text))
        End Using
    End Function

    Public Sub Dispose() Implements IDisposable.Dispose
        If Not _disposed Then
            _ocr?.Dispose()
            _disposed = True
        End If
    End Sub
End Class

' Startup.vb — forced singleton because of construction cost
services.AddSingleton(Of PaddleOcrEngine)()

using IronOcr;
using Microsoft.Extensions.DependencyInjection;

// IronTesseract has lightweight initialization — no model loading on construction
public class OcrEngine
{
    public string Read(string imagePath)
    {
        return new IronTesseract().Read(imagePath).Text;
    }
}

// Flexible registration — singleton, scoped, or transient all work
services.AddTransient<OcrEngine>();

// Or skip the wrapper entirely and inject IronTesseract directly
services.AddTransient<IronTesseract>();

Imports IronOcr
Imports Microsoft.Extensions.DependencyInjection

' IronTesseract has lightweight initialization — no model loading on construction
Public Class OcrEngine
    Public Function Read(imagePath As String) As String
        Return New IronTesseract().Read(imagePath).Text
    End Function
End Class

' Flexible registration — singleton, scoped, or transient all work
services.AddTransient(Of OcrEngine)()

' Or skip the wrapper entirely and inject IronTesseract directly
services.AddTransient(Of IronTesseract)()

// Simplified — see OpenCvSharp documentation for full API
using OpenCvSharp;
using Sdcb.PaddleOCR;

public string ReadWithPreprocessing(string imagePath, PaddleOcrAll ocr)
{
    using var original = Cv2.ImRead(imagePath);

    // Step 1: Grayscale conversion
    using var gray = new Mat();
    Cv2.CvtColor(original, gray, ColorConversionCodes.BGR2GRAY);

    // Step 2: Denoise (Gaussian blur to reduce noise)
    using var denoised = new Mat();
    Cv2.GaussianBlur(gray, denoised, new Size(3, 3), 0);

    // Step 3: Adaptive threshold for binarization
    using var binary = new Mat();
    Cv2.AdaptiveThreshold(denoised, binary, 255,
        AdaptiveThresholdTypes.GaussianC, ThresholdTypes.Binary, 11, 2);

    // Step 4: Deskew — requires custom rotation detection logic (not shown)
    // Several dozen lines of custom Mat operations

    var result = ocr.Run(binary);
    return string.Join(" ", result.Regions.Select(r => r.Text));
    // Each Mat must be disposed; missing a using block leaks native memory
}

Imports OpenCvSharp
Imports Sdcb.PaddleOCR

Public Function ReadWithPreprocessing(imagePath As String, ocr As PaddleOcrAll) As String
    Using original As Mat = Cv2.ImRead(imagePath)

        ' Step 1: Grayscale conversion
        Using gray As New Mat()
            Cv2.CvtColor(original, gray, ColorConversionCodes.BGR2GRAY)

            ' Step 2: Denoise (Gaussian blur to reduce noise)
            Using denoised As New Mat()
                Cv2.GaussianBlur(gray, denoised, New Size(3, 3), 0)

                ' Step 3: Adaptive threshold for binarization
                Using binary As New Mat()
                    Cv2.AdaptiveThreshold(denoised, binary, 255, AdaptiveThresholdTypes.GaussianC, ThresholdTypes.Binary, 11, 2)

                    ' Step 4: Deskew — requires custom rotation detection logic (not shown)
                    ' Several dozen lines of custom Mat operations

                    Dim result = ocr.Run(binary)
                    Return String.Join(" ", result.Regions.Select(Function(r) r.Text))
                End Using
            End Using
        End Using
    End Using
End Function

using IronOcr;

public string ReadWithPreprocessing(string imagePath)
{
    using var input = new OcrInput();
    input.LoadImage(imagePath);

    // Named operations replace OpenCV knowledge requirements
    input.Deskew();
    input.DeNoise();
    input.Contrast();
    input.Binarize();

    var result = new IronTesseract().Read(input);
    return result.Text;
    // OcrInput implements IDisposable; using block handles cleanup
}

Imports IronOcr

Public Function ReadWithPreprocessing(imagePath As String) As String
    Using input As New OcrInput()
        input.LoadImage(imagePath)

        ' Named operations replace OpenCV knowledge requirements
        input.Deskew()
        input.DeNoise()
        input.Contrast()
        input.Binarize()

        Dim result = New IronTesseract().Read(input)
        Return result.Text
        ' OcrInput implements IDisposable; using block handles cleanup
    End Using
End Function

// Simplified — see Sdcb.PaddleInference documentation for full API
using Sdcb.PaddleInference;
using Sdcb.PaddleOCR;

public PaddleOcrAll CreateOcrEngine(string backendMode)
{
    // Each backend requires a different NuGet runtime package installed
    switch (backendMode)
    {
        case "gpu":
            // Requires: Sdcb.PaddleInference.runtime.win64.cuda
            // Requires: CUDA toolkit + cuDNN installed on host
            var gpuConfig = PaddleConfig.FromModelDir("models/");
            gpuConfig.EnableGpu(500, deviceId: 0); // Simplified
            break;

        case "openvino":
            // Requires: Sdcb.PaddleInference.runtime.win64.mkl
            var oviConfig = PaddleConfig.FromModelDir("models/");
            oviConfig.EnableMkldnn(); // Simplified
            break;

        default:
            // CPU-only — still requires platform-specific runtime package
            var cpuConfig = PaddleConfig.FromModelDir("models/");
            cpuConfig.SetCpuMathLibraryNumThreads(Environment.ProcessorCount);
            break;
    }

    // Backend-specific config passed to model constructors — Simplified
    var detModel = LocalFullModels.ChineseV3.DetectionModel;
    var clsModel = LocalFullModels.ChineseV3.ClassifierModel;
    var recModel = LocalFullModels.ChineseV3.RecognitionModel;
    return new PaddleOcrAll(detModel, clsModel, recModel);
}

Imports Sdcb.PaddleInference
Imports Sdcb.PaddleOCR

Public Function CreateOcrEngine(ByVal backendMode As String) As PaddleOcrAll
    ' Each backend requires a different NuGet runtime package installed
    Select Case backendMode
        Case "gpu"
            ' Requires: Sdcb.PaddleInference.runtime.win64.cuda
            ' Requires: CUDA toolkit + cuDNN installed on host
            Dim gpuConfig As PaddleConfig = PaddleConfig.FromModelDir("models/")
            gpuConfig.EnableGpu(500, deviceId:=0) ' Simplified

        Case "openvino"
            ' Requires: Sdcb.PaddleInference.runtime.win64.mkl
            Dim oviConfig As PaddleConfig = PaddleConfig.FromModelDir("models/")
            oviConfig.EnableMkldnn() ' Simplified

        Case Else
            ' CPU-only — still requires platform-specific runtime package
            Dim cpuConfig As PaddleConfig = PaddleConfig.FromModelDir("models/")
            cpuConfig.SetCpuMathLibraryNumThreads(Environment.ProcessorCount)
    End Select

    ' Backend-specific config passed to model constructors — Simplified
    Dim detModel = LocalFullModels.ChineseV3.DetectionModel
    Dim clsModel = LocalFullModels.ChineseV3.ClassifierModel
    Dim recModel = LocalFullModels.ChineseV3.RecognitionModel
    Return New PaddleOcrAll(detModel, clsModel, recModel)
End Function

using IronOcr;

// なし backend selection. なし switch statement. なし environment variable check.
// The same code runs on CPU-only VMs, GPU workstations, and ARM devices.
public IronTesseract CreateOcrEngine()
{
    return new IronTesseract();
}

// Parallel processing across CPU cores — no GPU configuration required
public IEnumerable<string> ReadBatch(IEnumerable<string> imagePaths)
{
    var results = new System.Collections.Concurrent.ConcurrentBag<string>();
    Parallel.ForEach(imagePaths, path =>
    {
        var result = new IronTesseract().Read(path);
        results.Add(result.Text);
    });
    return results;
}

Imports IronOcr
Imports System.Collections.Concurrent
Imports System.Threading.Tasks

' なし backend selection. なし switch statement. なし environment variable check.
' The same code runs on CPU-only VMs, GPU workstations, and ARM devices.
Public Function CreateOcrEngine() As IronTesseract
    Return New IronTesseract()
End Function

' Parallel processing across CPU cores — no GPU configuration required
Public Function ReadBatch(imagePaths As IEnumerable(Of String)) As IEnumerable(Of String)
    Dim results As New ConcurrentBag(Of String)()
    Parallel.ForEach(imagePaths, Sub(path)
                                     Dim result = New IronTesseract().Read(path)
                                     results.Add(result.Text)
                                 End Sub)
    Return results
End Function

// Simplified — see Sdcb.PaddleOCR documentation for full API
using Sdcb.PaddleOCR;
using Sdcb.PaddleOCR.Models;
using OpenCvSharp;

public class TableRecognitionService
{
    // Standard OCR engine — 3 models
    private readonly PaddleOcrAll _textOcr;

    // Table engine — 4th model, separate initialization
    // private readonly PaddleOcrTable _tableOcr; // Simplified

    public TableRecognitionService()
    {
        var detModel = LocalFullModels.ChineseV3.DetectionModel;
        var clsModel = LocalFullModels.ChineseV3.ClassifierModel;
        var recModel = LocalFullModels.ChineseV3.RecognitionModel;
        _textOcr = new PaddleOcrAll(detModel, clsModel, recModel);

        // Table model: separate download, separate version tracking
        // var tableModel = LocalFullModels.TableEnV2.Model; // Simplified
        // _tableOcr = new PaddleOcrTable(tableModel); // Simplified
    }

    public void ProcessDocument(string imagePath)
    {
        using var image = Cv2.ImRead(imagePath);

        // Text extraction path
        var textResult = _textOcr.Run(image);
        var text = string.Join(" ", textResult.Regions.Select(r => r.Text));

        // Table extraction path — different API, different result structure
        // var tableResult = _tableOcr.Run(image); // Simplified
        // foreach (var cell in tableResult.Cells) { ... } // Simplified
    }
}

Imports Sdcb.PaddleOCR
Imports Sdcb.PaddleOCR.Models
Imports OpenCvSharp

Public Class TableRecognitionService
    ' Standard OCR engine — 3 models
    Private ReadOnly _textOcr As PaddleOcrAll

    ' Table engine — 4th model, separate initialization
    ' Private ReadOnly _tableOcr As PaddleOcrTable ' Simplified

    Public Sub New()
        Dim detModel = LocalFullModels.ChineseV3.DetectionModel
        Dim clsModel = LocalFullModels.ChineseV3.ClassifierModel
        Dim recModel = LocalFullModels.ChineseV3.RecognitionModel
        _textOcr = New PaddleOcrAll(detModel, clsModel, recModel)

        ' Table model: separate download, separate version tracking
        ' Dim tableModel = LocalFullModels.TableEnV2.Model ' Simplified
        ' _tableOcr = New PaddleOcrTable(tableModel) ' Simplified
    End Sub

    Public Sub ProcessDocument(imagePath As String)
        Using image = Cv2.ImRead(imagePath)
            ' Text extraction path
            Dim textResult = _textOcr.Run(image)
            Dim text = String.Join(" ", textResult.Regions.Select(Function(r) r.Text))

            ' Table extraction path — different API, different result structure
            ' Dim tableResult = _tableOcr.Run(image) ' Simplified
            ' For Each cell In tableResult.Cells ' Simplified
            ' ... 
            ' Next
        End Using
    End Sub
End Class

using IronOcr;

public class TableRecognitionService
{
    // One engine handles both text and table regions
    public void ProcessDocument(string imagePath)
    {
        var ocr = new IronTesseract();
        var result = ocr.Read(imagePath);

        // Structured hierarchy: pages → paragraphs → lines → words
        foreach (var page in result.Pages)
        {
            foreach (var paragraph in page.Paragraphs)
            {
                Console.WriteLine($"Block at ({paragraph.X},{paragraph.Y}): {paragraph.Text}");
            }
        }

        Console.WriteLine($"Full document text: {result.Text}");
    }
}

Imports IronOcr

Public Class TableRecognitionService
    ' One engine handles both text and table regions
    Public Sub ProcessDocument(imagePath As String)
        Dim ocr As New IronTesseract()
        Dim result = ocr.Read(imagePath)

        ' Structured hierarchy: pages → paragraphs → lines → words
        For Each page In result.Pages
            For Each paragraph In page.Paragraphs
                Console.WriteLine($"Block at ({paragraph.X},{paragraph.Y}): {paragraph.Text}")
            Next
        Next

        Console.WriteLine($"Full document text: {result.Text}")
    End Sub
End Class

using IronOcr;

var ocr = new IronTesseract();
using var input = new OcrInput();
input.LoadImage("invoice-with-table.jpg");

var result = ocr.Read(input);

// Access structured page layout for table region extraction
foreach (var page in result.Pages)
{
    foreach (var line in page.Lines)
    {
        // Lines within a table region preserve spatial ordering
        Console.WriteLine($"Row text: {line.Text} | Y position: {line.Y}");
        foreach (var word in line.Words)
        {
            Console.WriteLine($"  Cell: '{word.Text}' at X={word.X}");
        }
    }
}

Imports IronOcr

Dim ocr As New IronTesseract()
Using input As New OcrInput()
    input.LoadImage("invoice-with-table.jpg")

    Dim result = ocr.Read(input)

    ' Access structured page layout for table region extraction
    For Each page In result.Pages
        For Each line In page.Lines
            ' Lines within a table region preserve spatial ordering
            Console.WriteLine($"Row text: {line.Text} | Y position: {line.Y}")
            For Each word In line.Words
                Console.WriteLine($"  Cell: '{word.Text}' at X={word.X}")
            Next
        Next
    Next
End Using

// Simplified — PaddleSharp has no PDF output. Requires a separate PDF library.
// Example of what teams typically build:

// using Sdcb.PaddleOCR;
// using SomePdfLibrary; // Third dependency to produce searchable PDF

public void ArchiveScannedDocument(string imagePath, string outputPdfPath)
{
    // Step 1: OCR via PaddleSharp — produces text only
    // var text = _ocr.Run(Cv2.ImRead(imagePath));

    // Step 2: Build a PDF with text overlay using a separate PDF library
    // Requires: text positions mapped to PDF coordinate space
    // Requires: image embedded as background
    // Requires: invisible text layer positioned over image
    // ~50–100 lines of PDF construction code
    throw new NotImplementedException("Requires a separate PDF library");
}

Public Sub ArchiveScannedDocument(imagePath As String, outputPdfPath As String)
    ' Step 1: OCR via PaddleSharp — produces text only
    ' Dim text = _ocr.Run(Cv2.ImRead(imagePath))

    ' Step 2: Build a PDF with text overlay using a separate PDF library
    ' Requires: text positions mapped to PDF coordinate space
    ' Requires: image embedded as background
    ' Requires: invisible text layer positioned over image
    ' ~50–100 lines of PDF construction code
    Throw New NotImplementedException("Requires a separate PDF library")
End Sub

using IronOcr;

public void ArchiveScannedDocument(string imagePath, string outputPdfPath)
{
    using var input = new OcrInput();
    input.LoadImage(imagePath);
    input.Deskew();   // Straighten scan before archiving
    input.DeNoise();  // Clean up scan artifacts

    var ocr = new IronTesseract();
    var result = ocr.Read(input);

    // One call: OCR + searchable PDF with text layer + image background
    result.SaveAsSearchablePdf(outputPdfPath);
}

// Multi-page document — same pattern
public void ArchiveMultiPageDocument(string[] imageFiles, string outputPdfPath)
{
    using var input = new OcrInput();
    foreach (var file in imageFiles)
        input.LoadImage(file);

    var result = new IronTesseract().Read(input);
    result.SaveAsSearchablePdf(outputPdfPath);
}

Imports IronOcr

Public Sub ArchiveScannedDocument(imagePath As String, outputPdfPath As String)
    Using input As New OcrInput()
        input.LoadImage(imagePath)
        input.Deskew()   ' Straighten scan before archiving
        input.DeNoise()  ' Clean up scan artifacts

        Dim ocr As New IronTesseract()
        Dim result = ocr.Read(input)

        ' One call: OCR + searchable PDF with text layer + image background
        result.SaveAsSearchablePdf(outputPdfPath)
    End Using
End Sub

' Multi-page document — same pattern
Public Sub ArchiveMultiPageDocument(imageFiles As String(), outputPdfPath As String)
    Using input As New OcrInput()
        For Each file In imageFiles
            input.LoadImage(file)
        Next

        Dim result = New IronTesseract().Read(input)
        result.SaveAsSearchablePdf(outputPdfPath)
    End Using
End Sub

dotnet remove package OpenCvSharp4
dotnet remove package OpenCvSharp4.runtime.win
dotnet clean
dotnet build

# Locate model directory references in application code
grep -r "LocalFullModels\|ModelPath\|models/" --include="*.cs" .
grep -r "DetectionModel\|RecognitionModel\|ClassifierModel" --include="*.cs" .

// PaddleSharp — forced singleton due to construction cost
services.AddSingleton<PaddleOcrAll>(sp =>
{
    var det = LocalFullModels.ChineseV3.DetectionModel;  // Simplified
    var cls = LocalFullModels.ChineseV3.ClassifierModel; // Simplified
    var rec = LocalFullModels.ChineseV3.RecognitionModel; // Simplified
    return new PaddleOcrAll(det, cls, rec);
});

// IronOCR — transient works; no expensive construction
services.AddTransient<IronTesseract>();

Imports Microsoft.Extensions.DependencyInjection

' PaddleSharp — forced singleton due to construction cost
services.AddSingleton(Of PaddleOcrAll)(Function(sp)
    Dim det = LocalFullModels.ChineseV3.DetectionModel ' Simplified
    Dim cls = LocalFullModels.ChineseV3.ClassifierModel ' Simplified
    Dim rec = LocalFullModels.ChineseV3.RecognitionModel ' Simplified
    Return New PaddleOcrAll(det, cls, rec)
End Function)

' IronOCR — transient works; no expensive construction
services.AddTransient(Of IronTesseract)()

// PaddleSharp — manual reading-order sort required
var text = string.Join("\n", result.Regions
    .OrderBy(r => r.Rect.Center.Y)
    .ThenBy(r => r.Rect.Center.X)
    .Select(r => r.Text));

// IronOCR — result.Text is already in reading order; no sort needed
var text = result.Text;

// For word-level access with position, use the structured hierarchy directly
foreach (var word in result.Pages[0].Words)
{
    Console.WriteLine($"{word.Text} at ({word.X},{word.Y})");
}

Imports System
Imports System.Linq

' PaddleSharp — manual reading-order sort required
Dim text = String.Join(vbCrLf, result.Regions _
    .OrderBy(Function(r) r.Rect.Center.Y) _
    .ThenBy(Function(r) r.Rect.Center.X) _
    .Select(Function(r) r.Text))

' IronOCR — result.Text is already in reading order; no sort needed
text = result.Text

' For word-level access with position, use the structured hierarchy directly
For Each word In result.Pages(0).Words
    Console.WriteLine($"{word.Text} at ({word.X},{word.Y})")
Next

grep -n "Sdcb\|OpenCvSharp\|PaddleInference" *.csproj

using IronOcr;

// Target specific table cells by region instead of full-page table detection
var totalAmountRegion = new CropRectangle(400, 600, 200, 30); // x, y, width, height
using var input = new OcrInput();
input.LoadImage("invoice.jpg", totalAmountRegion);

var result = new IronTesseract().Read(input);
Console.WriteLine($"Total: {result.Text}");

Imports IronOcr

' Target specific table cells by region instead of full-page table detection
Dim totalAmountRegion As New CropRectangle(400, 600, 200, 30) ' x, y, width, height
Using input As New OcrInput()
    input.LoadImage("invoice.jpg", totalAmountRegion)

    Dim result = New IronTesseract().Read(input)
    Console.WriteLine($"Total: {result.Text}")
End Using

# Find all PaddleSharp and PaddleInference usages
grep -rn "Sdcb\.PaddleOCR\|Sdcb\.PaddleInference" --include="*.cs" .

# Find OpenCV usages that will need replacement
grep -rn "OpenCvSharp\|Cv2\.\|using var.*Mat\b" --include="*.cs" .

# Find model path references and configuration
grep -rn "LocalFullModels\|ModelDir\|DetectionModel\|RecognitionModel\|ClassifierModel" --include="*.cs" .

# Find backend selection logic
grep -rn "EnableGpu\|EnableMkldnn\|PaddleConfig\|SetCpuMath" --include="*.cs" .

# Find table recognition usages
grep -rn "PaddleOcrTable\|TableModel\|table.*ocr\|ocr.*table" --include="*.cs" .

# Find result region access patterns that need updating
grep -rn "\.Regions\b\|Rect\.Center\|region\.Text" --include="*.cs" .