JP2006190028A - Method for forming two-dimensional bar code to be displayed on television screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for forming a two-dimensional bar code to be displayed on a television screen, particularly, capable of displaying the two-dimensional bar code to an analog television receiver with a high recognition rate. <P>SOLUTION: The following processing 1, 2, 3 and 4 are performed. Processing 1: An error collection code level of two-dimensional bar code is set to 30%. Processing 2: The two-dimensional bar code is formed in a vector image. Processing 3: A margin is set to 8 cells or more. Processing 4: The background of the two-dimensional bar code is set to RGB (195, 195, 195). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for creating a two-dimensional barcode that can display a two-dimensional barcode with a high recognition rate when a two-dimensional barcode (for example, QR code: trademark) is displayed on a television screen.

Conventionally, a two-dimensional barcode is displayed on a paper medium centered on a printed matter, and the two-dimensional barcode is read by a camera function of a mobile phone to obtain a URL of the mobile homepage and obtain information from the mobile homepage. An information communication system which can be used is generally known.
As described above, by using the two-dimensional barcode, the trouble of inputting the URL to the mobile phone can be omitted, and the effect of improving the convenience of accessing the mobile homepage becomes very large.

  As a measure for expanding the use of such a two-dimensional barcode, in recent years, attention has been focused on television media, and information on displaying a two-dimensional barcode on the television screen with the display target of the two-dimensional barcode as a television screen. A communication system has been proposed (see Patent Document 1).

  However, when a two-dimensional barcode is displayed on a television screen, particularly when the display target is an analog television receiver, there is a problem that the recognition rate is low and the practical use has not been achieved.

In other words, in the current analog television receiver (CRT receiver), the structure in which 29.97 frames are displayed per second with 525 scanning lines is displayed in a jagged manner between the scanning lines. .
This is a cause of a significant reduction in the recognition rate for a two-dimensional barcode expressed by an aggregate of small points.
In addition, when reading a two-dimensional barcode with a mobile phone, the analysis is based on a still image from the attached CCD camera. Depending on the sampling speed at which the still image is extracted, the scanning line is reflected as a shadow, The shadow covers a part of the two-dimensional barcode, which hinders recognition.
JP 2004-192149 A

  The present invention has been made to solve the above-described problems, and is a two-dimensional barcode that can display a two-dimensional barcode with a high recognition rate even on a television screen, particularly an analog television receiver. It is an issue to provide a method for creating the.

In order to solve the above problems, the method for creating a two-dimensional barcode displayed on the television screen of the present invention is configured to perform the following processing 1, processing 2, processing 3, and processing 4.
Process 1: The error correction code level of the two-dimensional barcode is set to 30%.
Process 2: A two-dimensional barcode is created as a vector image.
Process 3: The margin is set to 8 cells or more.
Process 4: The background color of the two-dimensional barcode is changed to RGB (195, 195, 195).

In the present invention, by using an error correction code of a two-dimensional bar code and creating at the standard maximum level H (30%), data loss due to image disturbance or blurring in an analog television receiver is complemented.
The created two-dimensional barcode is created with a vector image that is resistant to machining in order to minimize the disturbance in the machining stage.
For the color blur on the screen, the margin area with the outside is expanded to 8 cells.
Further, the background color of the two-dimensional barcode is set to RGB (195, 195, 195) to lower the background luminance, thereby preventing a reduction in the misunderstanding rate due to the reflection of the scanning line of the television receiver.
Since it is a creation method that uses these processes in combination, a two-dimensional barcode can be displayed at a high recognition rate even in an analog television receiver.

FIG. 1 is an explanatory diagram of a manufacturing process showing an embodiment of a method for creating a two-dimensional barcode of the present invention.
Hereinafter, a description will be given with reference to FIG.
The manufacturing process of the embodiment includes a two-dimensional barcode creation process A, a two-dimensional barcode processing process B, and a two-dimensional barcode insertion process C.

In the two-dimensional barcode creation process A, the following conditions 1 and 2 are set as the creation conditions.
Condition 1: The error correction code level is set to the standard maximum level H (30%).
Condition 2: The cell size is 1 mm × 1 mm.

Two-dimensional barcodes that can be used on mobile phones are logistics management barcodes created for warehouse management, etc., and due to their characteristics, error correction using Reed-Solomon codes to deal with loss or contamination of the code itself. The sign is incorporated.
This Reed-Solomon code is one of the error correction codes that can detect and correct data errors. It is a mathematical error correction method that can correct consecutive errors (burst errors). Have correct correction ability.
Reed-Solomon codes are used in storage devices such as CDs, hard disks, DATs, and DVDs, and in communication fields such as ADSL and space communications.

  There are four levels of error correction code levels for two-dimensional barcodes: Level L (7%), Level M (15%), Level Q (25%), Level H (30%), and printed materials (magazines and advertisements)・ When a business card is displayed, an error correction code corresponding to 7% (error correction level L) or 15% (error correction level M) is generally added because there is no need to consider a large loss. Often to do.

This is because if the error correction code level is increased, the amount of data and the amount of processing will increase dramatically, the barcode itself will become very precise, and if it is made a recognizable cell size, it will require a lot of space. It is.
However, simply increasing the error correction code increases the recognition rate of a two-dimensional barcode in an analog television receiver only by 10 to 15%, and it is difficult to combine without other measures.

  Regarding the cell size, it is better to be as large as possible in order to cope with the blurring of the TV screen. Therefore, the standard was 1.0 mm × 1.0 mm.

The output at the time of creation is output as a vector image.
A vector image is an image format with only a linear definition that connects the contact points, and it is an image in processing rather than an image that defines an image in a collection of points like a commonly used bitmap image. Therefore, it is possible to minimize the deterioration of the image in the subsequent processing stage.

When the number of cells of the two-dimensional barcode produced in this two-dimensional barcode creation process A is 50 cells × 50 cells or more, the two-dimensional barcode is divided and the maximum two-dimensional barcode size is 50 mm. X50 mm.
This is for the same reason as described in the cell size condition section above, but to make the size of the two-dimensional barcode itself constant.

Next, the two-dimensional barcode processing step B will be described.
First, in order to align the design and the reading distance at the time of broadcasting on TV, the two-dimensional barcode size is set to 50 mm × 50 mm and the sizes are aligned.
The size of the two-dimensional barcode is preferably larger in order to cope with distortion and bleeding, but when reading with a mobile phone, it is necessary to increase the distance from the television receiver, and the ambient light, etc. It becomes easy to be affected.
In addition, when the shadow of the scanning line occurs in a band shape, the possibility that the shadow covers the two-dimensional barcode is increased, which causes a reduction in the recognition rate.
As a result of the proof experiment in consideration of this point, the 50 mm square was the best result.

Next, as a background, the color in the frame is RGB (195, 195, 195), and a square frame having a size output using Formula 1 below is created.
Then, the two-dimensional barcode is arranged in black at the center of the frame created in this way and synthesized.

<Formula 1: Background size>
(50 cells ÷ 2D barcode number × 66 mm) square Normally, the background has a margin (margin) of 4 cells from the 2D barcode, but in analog television receivers the surrounding colors are It oozes and narrows the margin. Therefore, in order to prevent the reading failure, the margin of 8 cells is set as a standard in the present invention.

The reason why the background color is RGB (195, 195, 195) is that the camera functions of mobile phones in recent years have been enhanced, and the function to adjust the brightness by changing the sampling speed while fixing the aperture is increasing. .
Therefore, by setting the background color of the two-dimensional bar code to RGB (195, 195, 195), the illusion that the bar code base was photographed in the dark with white is used, and the sampling speed of the camera is reduced to 1 / By guiding it to 30 seconds or less, the shadow of the scanning line is prevented from appearing in a strip shape as much as possible.

  A two-dimensional barcode telop is created by synthesizing the above two materials and outputting in an image format that can be inserted into a moving image.

In the two-dimensional barcode insertion step C, the generated two-dimensional barcode telop is inserted into a packaging VTR using editing software (for example, Illustrator: trademark) by a personal computer or the like.
Adjust the insertion size to approximately 5cm x 5cm on a 20-inch TV by using the enlargement / reduction function of the editing PC software, and arrange it at two or more locations on the screen, for example, display it at two locations above and below. ing.

It is manufacturing process explanatory drawing which shows the Example of the preparation method of the two-dimensional barcode of this invention.

Explanation of symbols

A 2D barcode creation process B 2D barcode processing process C 2D barcode insertion process

Claims (1)

A method for creating a two-dimensional barcode to be displayed on a television screen, wherein the following processing 1, processing 2, processing 3, and processing 4 are performed.
Process 1: The error correction code level of the two-dimensional barcode is set to 30%.
Process 2: A two-dimensional barcode is created as a vector image.
Process 3: The margin is set to 8 cells or more.
Process 4: The background color of the two-dimensional barcode is changed to RGB (195, 195, 195).

Images