JP2017182108A - Two-dimensional code reading method and two-dimensional code recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an image cutout marker to be immediately distinguished and recognized by varying a dot depth of the image cutout marker and information data cell.SOLUTION: In the secondary code which defines information data cells arrayed in the matrix of single color cells and the image cutout marker for specifying the positions of those information data cells as constituent elements, the depth of the single color image cutout marker and the single color dot of the information data cell are expressed different from each other, thereby defining them to be gray scale data and allowing the information data cell to have the gradation scale, and thus, the image cutout marker can be immediately distinguished and recognized.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method for reading a two-dimensional code that facilitates cutting out a two-dimensional code and increases the recognition speed, and a two-dimensional code recording medium thereof.

In the case of a conventional two-dimensional code reading procedure, a plurality of specific patterns (“cutout markers”) are searched for from an image captured by an area sensor in terms of image recognition. The existence range of the two-dimensional code is estimated from the positional relationship between them. 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 a conventional two-dimensional code expressed in monochrome gradation (black and white), the data area (information data cell) and the cutout marker portion are expressed with exactly the same dot depth, and the recording capacity to the information data cell increases. The density of cells constituting the two-dimensional code itself is increased, 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, there are various methods for converting electronic data into an information code and recording the code on a code display medium using the information code and decoding them as “black and white limits”. A method has been proposed. For example, several one-dimensional barcodes and two-dimensional barcodes that express information in a monochrome two-tone (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, the various two-dimensional codes developed following the two-dimensional code algorithm developed in the United States in the 1980s have inherited the symbolic structure that is the design philosophy of the two-dimensional code. The security concept is a technology at the time of development in the United States, and is 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 have been developed as shown in Patent Reference 2 below, due to recent technological innovations and higher precision of area sensors and faster CPUs for analyzing images.

In addition, as in Patent Document 1 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. It is lower than the monochrome two-gradation (monochrome) 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.

2011-186613 JP 2011-70477 A Patent No. 3996520

The problem to be solved is that the conventional 2D barcode extraction method has a technical problem that the image of the 2D code cannot be extracted unless the extraction pattern can be recognized quickly. Yes.

As a result, when the cutout markers are adjacent so as to be indistinguishable from the information data cells, there is a problem that it takes time to specify and cut out the image from the background image captured by the area sensor.

The present invention is expressed by differentiating the dot depth of the marker of the image cutout and the information data cell, the dot depth of the cutout marker portion is expressed as black of 1, and the data area (information data cell) is represented by the dot depth. By expressing the data as 8 monochrome two-gradation grayscale data, the symbol recognition time can be greatly shortened so that the image cutout marker can be recognized immediately and distinctly.

As described above, according to the present invention, two-dimensional code image cutout markers are expressed with different depths of single color image cutout markers and information data cell dots so that they can be recognized immediately and distinctly. In addition, it is expressed as monochrome two-grayscale grayscale data with gradation by changing the dot depth of the information data cell, so that the marker for image cropping can be recognized immediately and distinctly on the image. By speeding up the code recognition, it is possible to provide a two-dimensional code that can be operated efficiently.

One form of design example of two-dimensional code according to the present invention A form of 2D code design One form of 2D code design with internal cutout markers 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.

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 Two-dimensional code recording, which is a code, in which markers 1, 2, 3, and 4 for image cutout are represented by a dot depth of 1, and an information data cell 5 is represented by a gray scale of two-tone monochrome with a dot depth of 8 It is a medium.

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

A reader with a built-in area sensor is programmed in advance to recognize a black image with a dot depth of 1 in advance, thereby quickly recognizing the two-dimensional code image and using the distortion correction technology to obtain the two-dimensional code image. Correct the angle.

The cut out image is then scanned in the information data cell area (grayscale area).

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 above invention, the same operation can be performed with the two-dimensional code in the form of FIGS. 2 and 3 by shortening the image cutting time by making the dot depth of the cutting marker and the information data cell region different. Therefore, it can be applied to information transmission of two-dimensional code.

DESCRIPTION OF SYMBOLS 1 Cutout marker 2 Cutout marker 3 Cutout marker 4 Cutout marker 5 Information data cell 6 Cutout marker 7 Cutout marker 8 Cutout marker 9 Information data cell 10 Cutout marker 11 Information data cell

Claims (4)

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 Two-dimensional code reading method and two-dimensional code recording characterized in that a single-color dot in an information data cell is expressed with different depths and expressed as a gray scale with gradation in the information data cell Medium. The position of the information data cell is specified by using information data cells in which monochrome two-tone cells are arranged in a matrix and markers for image extraction for specifying the positions of the information data cells as constituent elements. In the two-dimensional code in which information data cells arranged in a matrix are placed inside the outer periphery of the two-dimensional code, and the marker for image clipping is placed on the outer periphery of the two-dimensional code. 2. The two-dimensional representation according to claim 1, wherein the depth is expressed in black of 1 and expressed in gray scale of monochrome two gradations of dot depth 8 of information data cells arranged in a matrix arranged inside. Code reading method and two-dimensional code recording medium thereof. The position of the information data cell is specified by using information data cells in which monochrome two-tone cells are arranged in a matrix and markers for image extraction for specifying the positions of the information data cells as constituent elements. In the two-dimensional code in which the marker for image clipping is installed inside the two-dimensional code and the information data cells arranged in a matrix are arranged in the outer peripheral portion, the dot depth of the image clipping marker installed inside The two-dimensional representation according to claim 1, wherein the two-dimensional representation is expressed in black of 1 and the dot depth 8 of the information data cells arranged in a matrix arranged on the outer periphery is expressed in gray scale of monochrome two gradations. Code reading method and two-dimensional code recording medium An information data cell having a single color cell arranged in a matrix and a marker for extracting an image for specifying the position of the information data cell are used as constituent elements for specifying the position of the information data cell. In the two-dimensional code in which the marker for image segmentation is installed inside the two-dimensional code and the information data cells arranged in a matrix are arranged on the outer periphery, the dot depth of the image segmentation marker installed inside is set to 1 2. The two-dimensional code reading method and the two-dimensional code recording medium according to claim 1, wherein the dot depth of information data cells arranged in a matrix is set to 32 as a black expression.

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