JP2017191420A - Two-dimensional code storage medium and two-dimensional code reading method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve recognizability of an image cutout marker by mixing cells having different dot constitutions for one cell.SOLUTION: In a two-dimensional code having an information data cell in which single color cells are arranged in a matrix, and an image cutout marker for identifying positions of the information data cells as components, classification between an image cutout marker part and an information data part may be easily performed by representing the dot constitution of the cell displaying the image cutout marker and the dot constitution of the cell displaying the information data cell to be different, and the image cutout marker can be immediately classified and recognized.SELECTED DRAWING: Figure 1

Description

The present invention relates to a recording medium capable of increasing the recording speed of a two-dimensional code by increasing the recognition speed of a two-dimensional code, and a method for reading the two-dimensional code.

In the case of a conventional two-dimensional code reading procedure, a plurality of image cutout markers are searched for in image recognition from images captured by an area sensor, and from the size of the image cutout markers and the positional relationship between them, Estimate the existence range of two-dimensional code. That is, the range and size of the corresponding two-dimensional barcode pattern are estimated, and the range is segmented. Then, from the read contents of each segment, a procedure is taken to confirm that the two-dimensional code exists there.

In the conventional two-dimensional code expressed in monochrome (black and white), the dot configuration of the cell expressing the data area (information data cell) and the cell expressing the cutout marker portion is expressed by exactly the same number of dots. When the recording capacity in the cell increases, the density of the cells constituting the two-dimensional code itself increases, and there is a problem that it takes time to recognize the cutout marker due to the closeness of the cutout marker portion and the information cell portion.

For example, in Patent Document 1 below, if the same type of pattern exists in a two-dimensional code, the feature recognition is delayed and feature recognition is delayed. From the 4-dot configuration, the configuration of the number of dots that make up one cell is set to 3 dots or less to prevent the cells from being combined during printing and to prevent the generation of the same type of pattern.

Further, in Patent Document 2 below, there are various methods for converting electronic data into an information code, and for recording on a code display medium using the information code and decoding them, as black and white limitations. Has been advocated. For example, several one-dimensional barcodes and two-dimensional barcodes that express information in a monochrome (black and white) pattern have been proposed. However, it is stated that barcodes that express information in white and black patterns cannot handle electronic data such as documents, images, or audio with a large amount of data because the data recording density per display area is low. Yes.

Certainly, various two-dimensional codes developed following the two-dimensional code algorithm developed in the United States in the 1980s have inherited the header information (symbol structure), which is the design philosophy of the two-dimensional code. Multilingual support and security concept are technologies at the time of development in the United States, and are not designed as a structure for recording a large amount of images and sounds.

However, two-dimensional codes capable of recording documents, sounds, and images as described in Patent Reference 1 have been developed as a result of technological innovations in recent years and higher-speed area sensors and higher-speed CPUs that analyze images.

Also, as in Patent Document 2 and Patent Document 3 below, attempts have been made to increase the number of cells and reduce the size of the cells in order to express electronic data in a two-dimensional color code at a high density.

However, since the two-dimensional color code increases the number of colors used, it tends to cause erroneous determination of cell color due to color change due to color change such as fading, printing unevenness, illumination light, dirt, etc. Compared to monochrome (black and white) two-dimensional code.

Many types of two-dimensional codes have been developed so far, but the problem of recognition speed and security still remains as issues.

JP2015-114680A JP 2011-186613 A Patent No. 3996520

The problem to be solved is that the conventional 2D barcode image cutout method has a technical problem that the image cutout pattern cannot be cut out if the image cutout pattern cannot be recognized quickly. It has become.

As a result, when the image cutout marker is adjacent to the information data cell so as to be indistinguishable, it takes time to cut out the specified 2D code image from the background image captured by the area sensor. Yes.

In addition, when the number of dots constituting one cell is recorded with a print configuration of 4 dots (FIG. 2) as a conventional cell representation of a two-dimensional code, the information capacity per area range of the two-dimensional code is small and the recording capacity is increased. Then, the area of the symbol becomes large, and there is a problem that it is difficult to read the two-dimensional code.

The present invention is expressed by differentiating the number of dots constituting one cell of the image cutout marker portion from the number of dots constituting one cell of the information data cell, and the number of dots constituting one cell of the image cutout marker portion is expressed as follows. By expressing as 4 dots (Fig. 2) and expressing the number of dots constituting one cell of the data area (information data cell) as 3 dots (Fig. 3) or 2 dots (Fig. 4), an image cutout marker The effect of highlighting the four-dot expression is facilitated, the distinction of the image cutout markers is facilitated, and the symbol recognition time can be greatly shortened.

As described above, according to the present invention, the number of dots constituting one cell of the marker part of the image cutout and one cell of the information data cell are constituted so that the two-dimensional code image cutout marker can be recognized immediately and distinctly. The number of dots to be displayed is expressed differently, and the number of dots constituting one cell of the data area (information data cell) portion is expressed as 3 dots (FIG. 3) or 2 dots (FIG. 4), thereby cutting out an image. The effect of highlighting the marker part of the image appears, and the marker for image cutout can be recognized immediately and distinctly on the image, and the recognition of the two-dimensional code is accelerated, enabling efficient operation. Become.

Further, the fact that the number of dots constituting one cell of the data area (information data cell) portion is small means an increase in the amount of information, and a two-dimensional code that can be efficiently operated can be provided. .

One form of design example of two-dimensional code according to the present invention A form of cell in which one cell is expressed by 4 dots One form of cell in which one cell is expressed by 3 dots A form of cell in which one cell is expressed by 2 dots It is a flow schematic diagram showing reading of the two-dimensional code concerning the present invention.

Embodiments of the claimed invention will be described with reference to FIGS. 1 and 5.

A two-dimensional structure comprising information data cells 5 in which cells of a single color are arranged in a matrix and markers 1, 2, 3, 4 for image cutout for specifying the positions of the information data cells The image clipping markers 1, 2, 3, and 4 are represented by 4 dots (FIG. 2) constituting one cell, and the information data cell 5 is represented by 3 dots (1 dot). This is a two-dimensional code recording medium expressed in FIG.

The reading is performed by capturing a raw image of the two-dimensional code with an area sensor.

The reader with the built-in area sensor is programmed in advance to recognize the image of the image cutout marker first, so that the two-dimensional code image can be recognized quickly and the two-dimensional code image can be obtained using distortion correction technology. Correct the angle.

In the cut-out two-dimensional code, the dot configuration of the marker portion and the information data portion is recorded in basic header information (symbol structure), and information scanning is performed based on the header information (symbol structure).

The distortion correction technology is used to correct the angle of the cropped image.

The data portion scanned and taken out is subjected to error correction (ECC) processing and compression / decompression processing.

The information extracted as described above is output as information of the associated information means (speech, text, etc.).

According to the present invention, the number of dots constituting one cell of the image cutout marker portion is different from the number of dots constituting one cell of the information data cell so that the two-dimensional code image cutout marker can be recognized immediately and distinctly. By expressing the number of dots constituting one cell of the data area (information data cell) portion as 3 dots (FIG. 3) or 2 dots (FIG. 4), the information amount of the two-dimensional code is increased and The effect of highlighting the image segmentation marker appears, and the image segmentation marker can be recognized immediately and distinctly on the image, and the recognition of the two-dimensional code has been accelerated. Possible two-dimensional codes can be provided.

DESCRIPTION OF SYMBOLS 1 Cutout marker 2 Cutout marker 3 Cutout marker 4 Cutout marker 5 Information data cell 6 Dot composition of the cell of FIG. 1 Cell outline diagram when the number of dots constituting 1 cell is 4 8 The number of dots constituting 1 cell is 4 Dot at the time of dot 9 Cell outline diagram when the number of dots constituting 1 cell is 3 dots Figure 10 Cell outline diagram when the number of dots constituting 1 cell is 3 dots 11 When the number of dots constituting 1 cell is 2 dots 12 Dot when the number of dots constituting one cell is 2

Claims (5)

In a two-dimensional code comprising information data cells in which cells of a single color are arranged in a matrix and markers for image extraction for specifying the positions of the information data cells, markers for image extraction are used. A two-dimensional code recording medium and a two-dimensional code reading method characterized in that the dot number configuration constituting one cell to be expressed is different from the dot number configuration constituting one cell expressing information data. An image cutout marker for specifying the position of an information data cell, which is composed of information data cells in which cells of a single color are arranged in a matrix and an image cutout marker for specifying the position of those information data cells. Is the number of dots constituting one cell representing the image cutout marker placed on the outer periphery of the two-dimensional code in which the information data cells arranged in a matrix are placed inside the two-dimensional code. Is expressed by a printing configuration of 4 dots or more, and expressed by a printing configuration in which the number of dots constituting one cell of information data arranged in a matrix arranged inside is 3 dots or less. A two-dimensional code recording medium and a two-dimensional code reading method. An image cutout marker for specifying the position of an information data cell, which is composed of information data cells in which cells of a single color are arranged in a matrix and an image cutout marker for specifying the position of those information data cells. Is set inside the two-dimensional code, and in the two-dimensional code where the information data cells arranged in a matrix are arranged on the outer periphery, the number of dots constituting one cell represented by the image cutout marker installed inside is The number of dots constituting one cell of information data arranged in a matrix arranged on the outer peripheral portion is expressed by a printing configuration of 3 dots or less. A two-dimensional code recording medium and a two-dimensional code reading method. An image cutout marker for specifying the position of an information data cell, which is composed of information data cells in which cells of a single color are arranged in a matrix and an image cutout marker for specifying the position of those information data cells. Is the number of dots constituting one cell representing the image cutout marker placed on the outer periphery of the two-dimensional code in which the information data cells arranged in a matrix are placed inside the two-dimensional code. Is expressed by a print configuration of 4 dots or more, and expressed by a print configuration of dots that can change the number of dots that make up one cell of information data arranged in a matrix arranged inside, a two-dimensional code dot 2. The two-dimensional code recording medium according to claim 1, wherein the design can be changed so that various designs can be expressed by information data cells. And a two-dimensional code reading method. In a two-dimensional code comprising information data cells in which cells of a single color are arranged in a matrix and markers for image extraction for specifying the positions of the information data cells, markers for image extraction are used. The number of dots constituting one cell and the number of dots constituting one cell representing information data are expressed differently, and the number of dots constituting one cell in the marker section for image clipping and information data A two-dimensional code recording medium characterized in that the number of dots constituting one cell of a part is recorded in header information (symbol structure) of a two-dimensional code.

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