ByteScout Premium Suite – C++ – Set image preprocessing filters with barcode reader sdk

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ByteScout Premium Suite – C++ – Set image preprocessing filters with barcode reader sdk

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How to set image preprocessing filters with barcode reader sdk in C++ using ByteScout Premium Suite

If you want to learn more then this tutorial will show how to set image preprocessing filters with barcode reader sdk in C++

The sample source code below will teach you how to set image preprocessing filters with barcode reader sdk in C++. ByteScout Premium Suite: the bundle that includes twelve SDK products from ByteScout including tools and components for PDF, barcodes, spreadsheets, screen video recording. It can set image preprocessing filters with barcode reader sdk in C++.

The SDK samples given below describe how to quickly make your application do set image preprocessing filters with barcode reader sdk in C++ with the help of ByteScout Premium Suite. Simply copy and paste in your C++ project or application you and then run your app! Use of ByteScout Premium Suite in C++ is also described in the documentation included along with the product.

Our website gives trial version of ByteScout Premium Suite for free. It also includes documentation and source code samples.

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ImagePreprocessingFilters.cpp

      #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

      // 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

      // 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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targetver.h

      #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>