DataMatrix Recognizer - Help

Version 1.000

Introduction

Program DataMatrix Recognizer is intended for recognition, decoding and coding of codes DataMatrix. Support of graphics formats JPEG, GIF, BMP is carried out. Possibility of recognition of graphics files which turn out, for example, at shooting of the camera of a mobile phone is realised. In the presence of graphics files generated by encoders DataMatrix, they are simply decoded without usage of functions of recognition. Realised coding DataMatrix, covers all modes and the accessible sizes.

1. Description of the standard DataMatrix

Technology 2D DataMatrix codes allows to code before 1556 bytes, 2335 symbols of the latin alphabet and 3116 digital units. Exist 24 sizes square symbol and 6 sizes rectangle symbol DataMatrix with adjustment error Reed-Solomon, providing possibility of the damage of the code from 28 before 62%.

Tab. 1 - Square symbols DataMatrix

Nubmer	Size	Data Capacity			% Error correction
		Num.	Alpha num.	Byte
1	10x10	6	3	1	62.5
2	12x12	10	6	3	58.3
3	14x14	16	10	6	55.6
4	16x16	24	16	10	50
5	18x18	36	25	16	43.8
6	20x20	44	31	20	45
7	22x22	60	43	28	40
8	24x24	72	52	34	40
9	26x26	88	64	42	38.9
10	32x32	124	91	60	36.7
11	36x36	172	127	84	32.8
12	40x40	228	169	112	29.6
13	44x44	288	214	142	28
14	48x48	348	259	172	28.1
15	52x52	408	304	202	29.2
16	64x64	560	418	277	28.6
17	72x72	736	550	365	28.1
18	80x80	912	682	453	29.6
19	88x88	1152	862	573	28
20	96x96	1392	1042	693	28.1
21	104x104	1632	1222	813	29.2
22	120x120	2100	1573	1047	28
23	132x132	2608	1954	1301	27.6
24	144x144	3116	2335	1556	28.5

Tab. 2 - Rectangle symbols DataMatrix

Nubmer	Size	Data Capacity			% Error correction
		Num.	Alpha num.	Byte
25	8x18	10	6	3	58.3
26	8x32	20	13	8	52.4
27	12x26	32	22	14	46.7
28	12x36	44	31	20	45.0
29	16x36	64	46	30	42.9
30	16x48	98	72	47	36.4

The High level of the coding DataMatrix supports 6 different modes, herewith ASCII mode consists of 3 sub-mode.

Tab. 3 - Modes of the coding DataMatrix

Number	Mode	Comment
0	ASCII standard ASCII extended ASCII numeric	ASCII character 0-127 ASCII character 128-255 Digits
1	C40	Character 0-127
2	TEXT	Character 0-127
3	X12	Character 13, 32, 42, 48-57, 62, 65-90
4	EDIFACT	Character 32-94
5	BASE256	Character 0-255

2. The description of functions of the program DataMatrix Recognizer

2.1. Interface

The basic working window of the program is presented in drawing 1:

Fig. 1 – The basic working window of the program DataMatrix Recognizer

As a whole it is visible that the program consists of following blocks: the menu (1), blocks of recognition (2), decoding (3) and encodings (4), graphic blocks (5) and (6), the block of input-output of the text (7), status line (8).

The menu contains a few items which, nevertheless, cover all necessary operations:

«File → Open» – causes a window of opening of graphic files of formats JPEG, GIF, BMP. Successfully open file is loaded into the graphic block (5). At failure the error stands out.

«File → Save» – calls a window of saving of a graphics file in format BMP which transfers control of the function saving the maps of the graphics block (6). The result of recognition or coding can be the map in this block.

«File → Options» – causes a window of options of the program (fig. 2). Here only two options – language switching (Russian, English), a choice of the size of an element of a matrix at performance of operation of coding. The size of a cell of a matrix should lie in limits from 1 to 50 pixels.

Fig. 2 – Window of options of the program

Other elements of the menu are clear and do not represent interest. Blocks of recognition, decoding and coding will be described more low. It is necessary to notice, what a badge «?» in corners of each block by pressing it translates the user to a brief information window, for example fig. 3.

Fig.3 – Brief information window

Graphics blocks are intended for mapping: (5) – the entry graphics information; (6) – the output graphics information. The graphics files which received by means of operations of coding or have been removed by a videocamera concern the entry graphics information (for example, a mobile phone). Double click on each graphics block allows to change map scale – expanded or total size.

The block of input-output of the text (7) is intended for text entering for coding, and also output of the decoded text. The ToolTip shows quantity of characters in this block. The status bar (8) is intended for informing of the user on made operations and errors.

2.2. Recognition mode

The given mode supports recognition of any way turned images of code DataMatrix received by the chamber under a various corner with a plane. At recognition the width of a cell of a matrix should equal or exceed 3 pixels. The algorithm does not provide possibility to turn colour, to change black for the white. Procedure provides reception of the monochrome image in which great value has the task of level of the brightness dividing dark and light. Use of a mode of automatic definition of brightness in most cases suffices. If code DataMatrix is not found out, you can choose a mode of brightness or in general, to set him. In fig. 4 results of recognition are presented.

Fig. 4 – Results of recognition

2.3. Decoding mode

The decoding mode is intended for decoding of the vertical codes DataMatrix generated by this or other programs. The example is resulted in a figure 5.

Fig. 5 – Decoding DataMatrix

2.4. Encoding mode

The coding mode supports all described encodings and the sizes. At coding you can set them, for example, we will encode «Hello World» coding C40 (Fig. 6).

Fig. 6 – Encoding example