Important Update
The code displayed below will guide you to install an C++ app to set image preprocessing filters with barcode reader sdk. ByteScout Data Extraction Suite is the set that includes 3 SDK products for data extraction from PDF, scans, images and from spreadsheets: PDF Extractor SDK, Data Extraction SDK, Barcode Reader SDK. It can be applied to set image preprocessing filters with barcode reader sdk using C++.
Want to save time? You will save a lot of time on writing and testing code as you may just take the C++ code from ByteScout Data Extraction Suite for set image preprocessing filters with barcode reader sdk below and use it in your application. Follow the instructions from scratch to work and copy the C++ code. If you want to use these C++ sample examples in one or many applications then they can be used easily.
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#include "stdafx.h"
///
/// This example demonstrates the use of image filters to improve the decoding confidence or speed.
///
#import "c:\\Program Files\\Bytescout BarCode Reader SDK\\net2.00\\Bytescout.BarCodeReader.tlb" raw_interfaces_only
using namespace Bytescout_BarCodeReader;
void PrintFoundBarcodes(IReaderPtr pIReader);
int _tmain(int argc, _TCHAR* argv[])
{
// Initialize COM.
HRESULT hr = CoInitialize(NULL);
// Create the interface pointer.
IReaderPtr pIReader(__uuidof(Reader));
// set the registration name and key
_bstr_t registrationName(L"DEMO");
pIReader->put_RegistrationName(registrationName);
_bstr_t registrationKey(L"DEMO");
pIReader->put_RegistrationKey(registrationKey);
// Set barcode type to find
_BarcodeTypeSelectorPtr pBarcodeTypesToFind;
pIReader->get_BarcodeTypesToFind(&pBarcodeTypesToFind);
pBarcodeTypesToFind->put_Code128(VARIANT_TRUE);
// Get image filters collection
_ImagePreprocessingFiltersCollection* pIImageFilters;
pIReader->get_ImagePreprocessingFilters(&pIImageFilters);
// WORKING WITH LOW CONTRAST BARCODE IMAGES
pIImageFilters->AddContrast(40);
// Add contrast adjustment for low-contrast image
_bstr_t sampleFile1(L".\\low-contrast-barcode.png");
wprintf(L"Image \"%s\"\n", static_cast<wchar_t*>(sampleFile1));
pIReader->ReadFromFile(sampleFile1);
PrintFoundBarcodes(pIReader);
pIImageFilters->Clear();
// WORKING WITH NOISY BARCODE IMAGES
// Add median filter to lower a noise
pIImageFilters->AddMedian();
_bstr_t sampleFile2(L".\\noisy-barcode.png");
wprintf(L"Image \"%s\"\n", static_cast<wchar_t*>(sampleFile2));
pIReader->ReadFromFile(sampleFile2);
PrintFoundBarcodes(pIReader);
pIImageFilters->Clear();
// WORKING WITH DENSE AND ILLEGIBLE BARCODES
// Add the scale filter to enlarge the barcode to make gaps between bars more distinguishable
pIImageFilters->AddScale_2(2.0);
_bstr_t sampleFile3(L".\\too-dense-barcode.png");
wprintf(L"Image \"%s\"\n", static_cast<wchar_t*>(sampleFile3));
pIReader->ReadFromFile(sampleFile3);
PrintFoundBarcodes(pIReader);
pIImageFilters->Clear();
// REMOVE EMPTY MARGINS FROM IMAGE TO SPEED UP THE PROCESSING
// Add the crop filter to cut off empty margins from the image.
// This will not improve the recognition quality but may speed up the processing
// if you enabled multiple barcode types to search.
pIImageFilters->AddCropDark();
_bstr_t sampleFile4(L".\\barcode-with-large-margins.png");
wprintf(L"Image \"%s\"\n", static_cast<wchar_t*>(sampleFile4));
pIReader->ReadFromFile(sampleFile4);
PrintFoundBarcodes(pIReader);
pIImageFilters->Clear();
// Uninitialize COM.
CoUninitialize();
// Wait until user press any key
system("pause");
return 0;
}
void PrintFoundBarcodes(IReaderPtr pIReader)
{
// Get found barcode count
long count;
pIReader->get_FoundCount(&count);
// Get found barcode information
for (int i = 0; i < count; i++)
{
SymbologyType type;
pIReader->GetFoundBarcodeType(i, &type);
wprintf(L"Barcode type: %d\n", type);
float confidence;
pIReader->GetFoundBarcodeConfidence(i, &confidence);
wprintf(L"Barcode confidence: %f\n", confidence);
BSTR bstrValue;
pIReader->GetFoundBarcodeValue(i, &bstrValue);
wprintf(L"Barcode value: %s\n", bstrValue);
::SysFreeString(bstrValue);
wprintf(L"\n");
}
if (count == 0)
{
wprintf(L"No barcodes found.\n");
}
}
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// stdafx.cpp : source file that includes just the standard includes
// CPPExample.pch will be the pre-compiled header
// stdafx.obj will contain the pre-compiled type information
#include "stdafx.h"
// TODO: reference any additional headers you need in STDAFX.H
// and not in this file
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// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#pragma once
#include "targetver.h"
#include <stdio.h>
#include <tchar.h>
// TODO: reference additional headers your program requires here
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#pragma once
// Including SDKDDKVer.h defines the highest available Windows platform.
// If you wish to build your application for a previous Windows platform, include WinSDKVer.h and
// set the _WIN32_WINNT macro to the platform you wish to support before including SDKDDKVer.h.
#include <SDKDDKVer.h>
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Explore ByteScout Data Extraction Suite Documentation
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60 Day Free Trial or Visit ByteScout Data Extraction Suite Home Page
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