High performance and reliable barcode decoding. It reads torn, crumpled barcodes and also barcodes corrupted in other ways. Decodes barcodes printed on various surfaces - plastic surfaces, distorted surfaces, etc.

Can search only part of image for barcodes.

Reads all barcodes from an image at a once independently of the orientation and location of the barcode.

Does not require the barcode to have a quiet zone. That is why it can read incorrectly positioned barcodes.

Can read barcodes from noisy and blurred images.

It can find barcodes that cannot be recognized.

Decodes images that have distortions typical of scanned images and images received by fax.

Processes low resolution and dithering images.

Decodes barcodes with human-introduced artifacts (signatures, marks, etc.).

Requirements

The DataSymbol SDK library has the following system requirements:

· Windows Phone 8

· Visual Studio 2012

Installation

Copy the SDK in any folder of your machine.

Directory Structure

DataSymbol SDK is a Windows Phone component written on С++. You should add reference on BarcodeReader.winmd into your project.

The DataSymbol SDK contains the following directories and files:

/ BarcodeReaderLib /ARM	ARM processor BarcodeReader.dll BarcodeReader.winmd
/ BarcodeReaderLib /Win32	x86 (32-bit) processor BarcodeReader.dll BarcodeReader.winmd
/Examples	Examples folder
/ Examples/PhoneApp1	C# example

Technical Specifications

Decodes all popular barcode types.

Linear:

Interleaved 2/5, Industrial 2/5, Code 39, Code 39 Extended, Codabar, Code 11, Code 128, Code 128 Extended, EAN/UCC 128, UPC-E, UPC-A, EAN-8, EAN-13, Code 93, Code 93 Extended, DataBar Omnidirectional (RSS-14), DataBar Truncated (RSS-14 Truncated), DataBar Limited (RSS Limited), DataBar Stacked, DataBar Expanded, DataBar Expanded Stacked.

2D: PDF417 (PDF417 Compact), QRCode, DataMatrix, Aztec (Aztec Compact)

Decodes any oriented barcodes.

Decoding time: depends from many factors (library settings, image size, barcode count, etc.) but usually up to 50ms on 2 GHz machine on 840x480 image.

Approximately barcode resolution (minimal module size) in pixel

Linear: 0.7 px

PDF417: 1.3 px

DataMatrix: 2 px

QRCode: 1.6 px

AztecCode: 1.6 px

Getting Started

Create new Phone 8 project.

Add reference to the BarcodeReader.winmd file.

Now you can use the DataSymbol Decoder.

The usage of the library is very simple. Here below, please, find the typical sample of the library usage.

//create decoder object

BarcodeDecoder dec = new BarcodeDecoder();

//set decoder params

DW_DECODEPARAMS par = new DW_DECODEPARAMS();

par.BarcodeTypes |= (uint)DW_BARTYPES.DW_ST_QRCODE; //add QRCode decoding

dec.SetDecoderParams(par);

//allocate frame buffer

byte[] buffer = new byte[(int)camera.PreviewResolution.Width *

(int)camera.PreviewResolution.Height];

//Copies the current viewfinder frame into a buffer for further decoding.

camera.GetPreviewBufferY(buffer);

//decode frame

DW_RECT rect = new DW_RECT();

rect.left = 0; rect.right = 0; //decode whole frame

DW_ERRORS res = dec.Decode(buffer, (int)camera.PreviewResolution.Width,

(int)camera.PreviewResolution.Height, rect);

//results

if (res == DW_ERRORS.DW_OK)

{

for (uint i = 0; i < dec.barcodes.length; ++i)

{

MessageBox(dec.barcodes.item(i).Text);

}

BarcodeDecoder class

Namespace: BarcodeReader

Methods

Decode

Decodes one frame. The frame is a byte matrix. Each byte has the value from 0 to 255 and represents one image pixel. 0 means a black pixel, 255 means a white pixel. Pixels are placed from the left to the right, from top to bottom, row by row.

The matrix is passed to the Decode method as a one-dimensional array. The first upper line of the image is sent first, then comes the second line and so on.

See the picture below for explanation.

Syntax

DW_ERRORS Decode(byte[] img, int width, int height, DW_RECT rect);

Parameters

img	Array of bytes that contains the frame
width	frame width
height	frame height
rect	scanning zone rectangle, if right and left are null then scan whole frame

Return Value

Error code.

Decode

Decodes .pgm file.

Syntax

DW_ERRORS Decode(byte[] PGM, DW_RECT rect);

Parameters

PGM	Contents of PGM file
width	frame width
height	frame height
rect	scanning zone rectangle, if right and left are null then scan whole file

Return Value

Error code.

SetDecoderParams

Sets all decoder properties.

Syntax

DW_ERRORS SetDecoderParams(DW_DECODEPARAMS decParams);

Parameters

decParams

DW_DECODEPARAMS class

Return Value

Error code.

Properties

barcodes

Returns decoded barcodes list.

Property value

Type: BarcodeList

BarcodeList class

Namespace: BarcodeReader

Methods

item

Returns Barcode object.

Syntax

Barcode item(uint32 index);

Parameters

index

Number of the barcode you want to get.

Return Value

Barcode object.

Properties

length

Returns the quantity of barcodes which were found.

Property value

Type: uint32

Barcode class

Namespace: BarcodeReader

Properties

BarcodeType

Returns the quantity of barcodes which were found.

Property value

Type: DW_BARTYPES

Text

Returns human readable data (barcode string).

Property value

Type: string

Data

Returns raw barcode data. Some barcode types (PDF417, Code128, QRCode, etc.) can contain binary data that is why to get this barcode you should better use this method instead of Text property.

Property value

Type: byte[]

Location

Returns barcode coordinates.

Property value

Type: DW_POINT[]

Reliability

Returns barcode decoding reliability (decoding quality). Possible values 0…100. Decoding quality less than 30 is considered as bad. This parameter is actual for 2D barcodes (PDF417, DataMatrix, QRCode, Aztec).

Property value

Type: uint8

DW_DECODEPARAMS class

Namespace: BarcodeReader

Properties

BarcodeTypes	Sets what types of barcodes should be decoded. Each barcode type has specified integer value. The barcodeTypes property can consist of any combination of these values, you should use the OR for that. Example: BarcodeTypes = DW_ST_PDF417\|DW_ST_QRCODE;
InverseType	Sets what barcodes should be decoded (darks on light or lights on dark).
Decoder Settings (Linear)
LinearShowSymbologyID	Sets the value determining whether to add Symbology ID to the barcode text or not.
LinearFindBarcodes	Sets how many Linear barcodes should be decoded on the image. An image may contain one or several barcodes. Works only in Professional edition, Standard decodes only one barcode.
LinearVerifyCheckDigit	Sets the value determining whether to verify the optional check digit in barcodes where this check digit is optional.
LinearShowCheckDigit	Show the check digit or not.
LinearShowStartStop	Show the start/stop characters or not. Some barcode types have start/stop characters (for example, Code39).
LinearCode39EnableExtended	Decode Code 39 as Code 39 Extended or not.
LinearUPCE2UPCA	Convert a UPC-E barcode to UPC-A or not.
LinearInterl25MinLen	The minimum length of an Interleaved 2/5 barcode. If the length of a read barcode is less than this value, the barcode is considered unrecognized.
LinearInterl25MaxLen	The maximum length of an Interleaved 2/5 barcode.
LinearIndustr25MinLen	The minimum length of an Industrial 2/5 barcode.
LinearIndustr25MaxLen	The maximum length of an Industrial 2/5 barcode.
LinearCode11MinLen	The minimum length of a Code11 barcode.
LinearCode11MaxLen	The maximum length of a Code11 barcode.
LinearCode39MinLen	The minimum length of a Code39 barcode.
LinearCode39MaxLen	The maximum length of a Code39 barcode.
LinearCode128MinLen	The minimum length of a Code128 barcode.
LinearCode128MaxLen	The maximum length of a Code128 barcode.
LinearCodabarMinLen	The minimum length of a Codabar barcode.
LinearCodabarMaxLen	The maximum length of a Codabar barcode.
LinearCode93MinLen	The minimum length of a Code93 barcode.
LinearCode93MaxLen	The maximum length of a Code93 barcode.
LinearDecSpeed	Linear barcode reading speed. Possible values: · 0 - Normal · 1 - Fast · 2 - Slow
LinearVerify	Verify linear barcode after decoding. Improves reliability linear barcode reading.
Decoder Settings (PDF417)
PDF417FindBarcodes	Sets how many PDF417 barcodes should be decoded on the image.
PDF417DecSpeed	PDF417 barcode reading speed.
PDF417SymbologyID	Show the PDF417 symbology ID.
Decoder Settings (DataMatrix)
DataMatrixFindBarcodes	Sets how many DataMatrix barcodes should be decoded on the image.
DataMatrixDecSpeed	DataMatrix barcode reading speed
DataMatrixSymbologyID	Show the DataMatrix symbology ID.
DataMatrixInverseType	what barcodes should be decoded (darks on light or lights on dark).
DataMatrixSupportECI	support or not ECI (Extended Channel Interpretation)
Decoder Settings (QRCode)
QRCodeFindBarcodes	Sets how many QRCode barcodes should be decoded on the image.
QRCodeDecSpeed	QRCode barcode reading speed
QRCodeSymbologyID	Show the QRCode symbology ID.
Decoder Settings (AztecCode)
AztecCodeFindBarcodes	Sets how many AztecCode barcodes should be decoded on the image.
AztecCodeDecSpeed	AztecCode barcode reading speed
AztecCodeSymbologyID	Show the AztecCode symbology ID.

DW_BARTYPES Enumerator

Namespace: BarcodeReader

Specifies barcode type.

Barcode Type	Value	Constant
Code 128	0x00000001	DW_ST_CODE128
Code 39	0x00000002	DW_ST_CODE39
Interleaved 2/5	0x00000004	DW_ST_INTERL25
EAN-13	0x00000008	DW_ST_EAN13
EAN-8	0x00000010	DW_ST_EAN8
Codabar	0x00000020	DW_ST_CODABAR
Code 11	0x00000040	DW_ST_CODE11
UPC-A	0x00000080	DW_ST_UPCA
UPC-E	0x00000100	DW_ST_UPCE
Industrial 2/5	0x00000200	DW_ST_INDUSTR25
Code 93	0x00000400	DW_ST_CODE93
DataBar omnidirectional, DataBar Truncated	0x00000800	DW_ST_DATABAR_OMNI
DataBar limited	0x00001000	DW_ST_DATABAR_LIM
DataBar stacked	0x00002000	DW_ST_DATABAR_STACKED
DataBar Expanded	0x00004000	DW_ST_DATABAR_EXP
DataBar Expanded stacked	0x00008000	DW_ST_DATABAR_EXP_STACKED
unrecognized linear	0x01000000	DW_ST_LINEAR_UNDEC
unrecognized PDF417	0x02000000	DW_ST_PDF417_UNDEC
unrecognized DataMatrix	0x04000000	DW_ST_DATAMATRIX_UNDEC
unrecognized QRCode	0x08000000	DW_ST_QRCODE_UNDEC
unrecognized AztecCode	0x00100000	DW_ST_AZTECCODE_UNDEC
DataMatrix	0x10000000	DW_ST_DATAMATRIX
PDF417	0x20000000	DW_ST_PDF417
QRCode	0x40000000	DW_ST_QRCODE
AztecCode	0x80000000	DW_ST_AZTECCODE

DW_ERRORS Enumerator

Namespace: BarcodeReader

Specifies error codes.

DW_OK	Ok
DW_ERROR	Error
DW_ERR_IN_PARAM	invalid input parameter
DW_CANT_ALLOC_MEM	can't allocate memory
DW_LIB_NOT_INIT	library doesn't initialized
DW_ERR_RES_IDX	invalid decoding result index

DW_DECSPEED Enumerator

Namespace: BarcodeReader

Specifies decoding speed.

DWS_NORMAL	Normal
DWS_FAST	Fast
DWS_SLOW	Slow