实例介绍
【实例简介】
VS C# OCR识别车牌实例
【实例截图】
【核心代码】
//----------------------------------------------------------------------------
// Copyright (C) 2004-2017 by EMGU Corporation. All rights reserved.
//----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Text;
using System.IO;
using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.Util;
using System.Diagnostics;
namespace Emgu.CV.OCR
{
/// <summary>
/// Library to invoke Tesseract OCR functions
/// </summary>
public static partial class OcrInvoke
{
static OcrInvoke()
{
//dummy code that is used to involve the static constructor of CvInvoke, if it has not already been called.
CvInvoke.CheckLibraryLoaded();
}
#region Tesseract
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern IntPtr TessBaseAPICreate();
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern int TessBaseAPIInit(
IntPtr ocr,
IntPtr dataPath,
IntPtr language,
OcrEngineMode mode);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIRelease(ref IntPtr ocr);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPISetImage(IntPtr ocr, IntPtr image);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPISetImagePix(IntPtr ocr, IntPtr pix);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIGetUTF8Text(
IntPtr ocr,
IntPtr text);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIGetHOCRText(IntPtr ocr, int pageNumber, IntPtr vectorOfByte);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIGetTSVText(IntPtr ocr, int pageNumber, IntPtr vectorOfByte);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIGetBoxText(IntPtr ocr, int pageNumber, IntPtr vectorOfByte);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIGetUNLVText(IntPtr ocr, IntPtr vectorOfByte);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIGetOsdText(IntPtr ocr, int pageNumber, IntPtr vectorOfByte);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPIExtractResult(IntPtr ocr, IntPtr charSeq, IntPtr resultSeq);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
[return: MarshalAs(CvInvoke.BoolMarshalType)]
internal static extern bool TessBaseAPIProcessPage(
IntPtr ocr,
IntPtr pix,
int pageIndex,
IntPtr filename,
IntPtr retryConfig,
int timeoutMillisec,
IntPtr renderer);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
[return: MarshalAs(CvInvoke.BoolMarshalType)]
internal static extern bool TessBaseAPISetVariable(
IntPtr ocr,
[MarshalAs(CvInvoke.StringMarshalType)]
String varName,
[MarshalAs(CvInvoke.StringMarshalType)]
String value);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern IntPtr TesseractGetVersion();
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessBaseAPISetPageSegMode(IntPtr ocr, PageSegMode mode);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern PageSegMode TessBaseAPIGetPageSegMode(IntPtr ocr);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern int TessBaseAPIGetOpenCLDevice(IntPtr ocr, ref IntPtr device);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern IntPtr TessBaseAPIAnalyseLayout(
IntPtr ocr,
[MarshalAs(CvInvoke.BoolMarshalType)]
bool mergeSimilarWords);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern int TessBaseAPIIsValidWord(
IntPtr ocr,
[MarshalAs(CvInvoke.StringMarshalType)]
String word);
#endregion
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessPageIteratorRelease(ref IntPtr iterator);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern void TessPageIteratorGetOrientation(IntPtr iterator, ref PageOrientation orientation, ref WritingDirection writingDirection, ref TextlineOrder order, ref float deskewAngle);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
[return: MarshalAs(CvInvoke.BoolMarshalType)]
internal static extern bool TessPageIteratorGetBaseLine(
IntPtr iterator,
PageIteratorLevel level,
ref int x1, ref int y1, ref int x2, ref int y2);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern OcrEngineMode TessBaseAPIGetOem(IntPtr ocr);
[DllImport(CvInvoke.ExternLibrary, CallingConvention = CvInvoke.CvCallingConvention)]
internal static extern int TessBaseAPIRecognize(IntPtr ocr);
}
}
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