JPH0362291A - Bar code test pattern - Google Patents

Abstract

PURPOSE:To quantitatively evaluate the characteristic of a bar code scanner against the soil and the omission of white of a bar code by displaying a spot consisting of a thin black line in a space of a bar code symbol in parallel to a bar. CONSTITUTION:A bar code test pattern A contains a spot 2 consisting of a thin black line shown in a space 1 (between bars) of a bar code symbol and is used for check of the anti-spot characteristic. Meanwhile a bar code test pattern B contains a void 4 consisting of thin white line put on a bar 3 of the bar code symbol and is used to check the anti-void characteristic. Such patterns A and B are prepared with the thickness of the spot and void lines 2 and 4 varied in several steps. Then these bar codes are read by a bar code scanner. Thus it is possible to check and evaluate the performance of the bar code scanner in accordance with a fact whether the scanner can surely read the test patterns or not.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to barcode test patterns for evaluating the performance of barcode scanners.

(Prior Art) Since barcodes must be read optically by a scanner, if there are black stains (spots) or voids in the barcode, it may cause misreading. Barcodes can be printed on labels and the like by various means, but when printed with a thermal transfer or wire tod printer, white voids are likely to occur, and with a laser printer, black stains (spots) are likely to occur.

Conventionally, in order to inspect and evaluate the barcode scanner's characteristics with respect to barcode spots and voids, we prepared several types of barcodes with stains and white spots that could actually occur, and used these evaluation charts. This was done by actually having the students read it.

(Problem to be Solved by the Invention) However, such evaluation charts cannot express specifications quantitatively, and therefore lack universality and reproducibility. Also, scan! − characteristics cannot be quantitatively evaluated.

An object of the present invention is to provide a universal barcode test pattern that can quantitatively evaluate the characteristics of a barcode scanner with respect to barcode stains and white spots.

(Means for Solving the Problems) In the barcode test pattern of the present invention, a spot consisting of a thin black line within the space of a barcode symbol or a void consisting of a thin white line above the bar is parallel to the bar. is displayed.

Note that this barcode test pattern is preferably composed of a series of barcode symbols of the same code in which the thickness of the black line as a spot or the white line as a void changes in stages.

(Example) FIG. 1 shows a barcode test pattern A for checking spot 4e properties. In this one, a spot 2 consisting of a thin black border is included in space 1 (between the bars) of the barcode symbol.

FIG. 2 is a barcode test pattern B for checking void resistance characteristics, in which a void 4 consisting of a thin white line is included above the bar 3 of the barcode symbol. The code is the first
It is a92345t, the same as the one in the figure. Note that FIGS. 1 and 2 show the barcode symbol enlarged so that the thin lines 2 and 4 of spots and voids can be clearly seen.

Prepare such barcode test patterns A and B with different thicknesses of spot and void lines 2 and 4, and read these barcodes with a barcode scanner. Inspect and evaluate barcode scanner performance against , voids, and spots.

Figure 3 is a barcode test chart that is actually used, and the center column shows the thickness of the black line 2 of the spot and the white line 4 of the void from 0°03 to 0.07m, respectively.
Five test patterns A and B are displayed, each with a pitch of 0.5mm and 0.01mm.

The convergence of the space 1 where the spot is located and the thickness of the bar 3 where the void is located are both 0.6 mm.

In the left column of the test chart of FIG. 3, a series of barcodes C are displayed that are enlarged or reduced versions of the same pattern in order to see the effect of barcode symbol size. In the right column, a series of barcodes D with varying line widths are displayed to show the resolution of the scanner.

(Effects of the Invention) In the barcode test pattern of the present invention, a spot consisting of a thin black line within the space of the barcode symbol or a void consisting of a thin white line above the bar is displayed parallel to the bar. The barcode scanner's spot/void characteristics can be inspected and evaluated based on whether it can be read correctly.

If you send a barcode test pattern from a series of barcodes in which the thickness of the black line (spot) or the white line (void) changes in stages, you can easily see how far it can be read correctly, making it easy to use. becomes.

[Brief explanation of drawings]

FIG. 1 is an enlarged view of a barcode test pattern for spot evaluation, FIG. 2 is an enlarged view of a barcode test pattern for void evaluation, and FIG. 3 is a barcode test chart.

Claims (1)

[Claims] 1. A barcode test pattern in which a spot (2) consisting of a thin black line is displayed in the space (1) of a barcode symbol parallel to a bar (3). 2. A barcode test pattern in which a void (4) consisting of a thin white line is displayed above the bar (3) of the barcode symbol in parallel to the bar (3). 3. The barcode test pattern according to claim 1, comprising a series of barcode symbols A in which the thickness of the black line (2), which is a spot, changes in stages. 4. The barcode test pattern according to claim 2, comprising a series of barcode symbols B in which the thickness of the white line (4), which is a void, changes in stages.