JPH0831132B2 - Print position measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A method for measuring the position of a printed character on a medium, wherein character projection processing means performs projection processing in character units for each character line and character string of image data read by a reading means, Counting means for counting the number of bits between the center positions of the projection data of the projected characters, calculation for converting the counted number of bits into a dimension, and producing a difference in the dimension between the center positions of the character projection data By providing the means, the position of the printed character can be automatically measured.

[Industrial applications]

The present invention relates to a printing character position measuring method on a medium, and more particularly to a character spacing determining method capable of automatically measuring a printing position using image data of printing read from a medium.

Printing position of characters printed by printer, inclination of characters,
There is a demand for a method capable of accurately and easily obtaining the character shift and the like.

[Problems to be solved by conventional technology and invention]

As a method of measuring the printing position of characters printed on the medium by a printer, the inclination of the characters, and the character deviation, the distance from the edge of the medium to the printing start character, the skew of the printing line, etc. are measured by a scale. Sometimes, a method of measuring with a magnifying glass is used.

According to the above conventional method, there is a problem that not only the measurement is troublesome and time-consuming, but also the measurement accuracy cannot be obtained. Therefore, a method for automating these measurements to improve the working efficiency and the measurement accuracy is demanded. There is.

An object of the present invention is to provide a character position measuring method capable of measuring a print position by using print image data read from a medium.

[Means for solving problems]

 FIG. 1 is a block diagram of the principle of the present invention.

In the figure, 7 is a character line of image data read from a medium, and character projection processing means for performing a projection process for each character string on a character string basis. Counting means for counting the number of bits between the center positions, the reference position on the medium, and the number of bits between the center positions of the projection data of the characters closest to the reference position, and 9 is the dimension of the number of bits counted by the counting means 8. It is a calculating unit that calculates and calculates the difference in size between the center positions.

[Action]

The image data read from the medium by the character projection processing unit 7 is subjected to a projection process for each character line and each character string to obtain the center position of each character.

Next, the counting means 8 counts the number of bits between each center position, the reference position on the medium, and the number of bits between the center positions of the projection data of the characters closest to the reference position.

Then, the counted number of bits is converted into a dimension by the computing means 9, and the dimension difference between the center positions is computed and output. In this way, it is possible to accurately and automatically measure the position of the printed character on the medium.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. The same reference numerals denote the same objects throughout the drawings. In FIG. 2, the ones corresponding to those in FIG. 1 are shown surrounded by a one-dot chain line.

In FIG. 2, the reading unit 2 includes a positioning / conveying mechanism 3 for setting and conveying the medium 1, an image sensor S, and an analog / digital (hereinafter referred to as A / D) conversion unit 4, and the medium 1 is printed. Read the image data of the characters and convert it to A / D.

The binarization circuit 5 binarizes the multi-tone image data sent from the reading unit 2, separates the medium surface from the printing unit, and removes noise by a median filter (not shown).

The image buffer 6 stores binarized image data.

The character projection processing unit 7a performs a projection process on a character-by-character basis for each character line and character string of the image data, and obtains the center position of the projection data of each character.

The pixel counting unit 8a detects the number of bits between the center positions of the character projection data, the reference position of the medium 1, for example, the end face positioned by the positioning and transporting mechanism 3 and the character closest to the end face, that is, the first embossing of the line. Then, the number of bits between the center positions of the projection data of the character is counted.

The calculation unit 9a converts the number of bits counted by the pixel counting unit 8a into mm based on the conversion count stored in the conversion data memory 10 and calculates the difference in distance between the center positions of the character projection data.

Further, 11 is a display (hereinafter referred to as CRT), 12 is a printer, and 13 is a control unit.

With such a configuration and function, as shown in FIG. 3, characters H are printed on the medium 1 in rows and columns, and the upper, lower, left, and right end ejection positions a _{1 to} d _{1 of} this character H are printed. , A ₂ ~
d _2, character spacing e, line spacing f, character vertical deviation g, will be described with reference to the flowchart of FIG. 4 the effect of the case of measuring the inclination i of the print line.

The image data read from the medium 1 and binarized is stored in the image buffer 6.

The character projection processing unit 7a performs the projection processing of the projection ranges Xs and Ys shown in FIG. 5 (a) to obtain the horizontal / vertical character center positions from the projection data. FIG. 5 (b) shows an example of projection data of the projection range Xs.

Therefore, the pixel count 8a obtains the character interval e from the character center position of the projection range Xs, and converts it into the dimension by the calculation unit 9a.

In addition, the projection positions a ₁ and b ₁ on the right and left edges of the upper row are projected ranges, respectively.
It is calculated from the left end character center position of Xs and the left end surface of medium 1, and the right end character center position and the right end surface of medium 1, and converted into dimensions.

In addition, the projection positions c ₁ and d ₁ at the upper and lower ends of the left end are projected ranges, respectively.
The size is calculated from the upper end surface of the medium 1 at the upper end character center position of Ys, the lower end character center position and the lower end surface of the medium 1, and converted into dimensions.

Next, the projection range Ye from the center position of the last character of the projection range Xs
Is performed to obtain the character center position.

Furthermore, from the center position of the second character in the projection range Ys, the projection range X ₂
Is projected to find the center position.

Next, the projection range from the last character center position of the projection range Ys
Perform the Xe projection process to find the center position.

Therefore, the pixel coefficient part 8a is the lower right and left end ejection positions a ₂ ,
b ₂ is calculated from the left end character center position of the projection range Xe and the left end face of the medium 1, and the right end character center position and the right end face of the medium 1, respectively.
The calculation unit 9a converts the dimensions.

In addition, the projection positions c ₂ and d ₂ at the upper and lower ends of the right end are projected ranges, respectively.
It is calculated from the upper end character center position of Ye and the upper end surface of the medium 1, and the lower end character center position and the lower end surface of the medium 1, and converted into dimensions.

The line spacing f is obtained from the character center position of the projection range Ys and converted into dimensions.

The calculator 9a obtains the inclination i of the character string from the difference between the character center positions of the projection ranges Ys and Ye.

The projection of the character digit shift g range Xs, obtained from the difference between the character center position of each of X _2.

Up / down / left / right embossing positions a _{1 to} d ₁ , a _{2 to} d ₂ , character spacing e,
Line spacing f, print inclination i, and character up / down deviation g
And output to the printer 12.

6 (a) and 6 (b) show different embodiments. The difference from the above embodiments is that a reference line, for example, a print range frame is printed on the medium 1 and the character position is measured with this frame as a reference. That is the way to do it.

That is, the pixel counting unit 8a is controlled to count the distance from the print range frame to the character center position.

Therefore, the character position and the like can be measured without the need to recognize the end surface of the medium 1.

In this way, the printing position and the like of the medium 1 can be automatically and accurately measured.

〔The invention's effect〕

As described above, according to the present invention, there is an effect that the character position of printing on the medium can be automatically and accurately measured.

[Brief description of drawings]

1 is a block diagram showing the principle of the present invention, FIG. 2 is a block diagram showing an embodiment according to the present invention, FIG. 3 is an explanatory view of the embodiment, FIG. 4 is a flowchart of the embodiment, and FIG. FIG. 6 is an explanatory view showing a measuring method of a different embodiment. In the figure, 1 is a medium, 2 is a reading unit, 7 is a character projection processing unit, 7a is a character projection processing unit, 8 is a counting unit, 8a is a pixel counting unit, 9 is a computing unit, 9a is a computing unit, and 10 is a conversion unit. Indicates a data memory.

Claims (1)

[Claims] 1. A character projection processing means (7) for reading characters printed on a medium by a reading means and projecting character lines and character strings of the read image data on a character-by-character basis, and the character projection processing. A count for counting the number of bits between the central positions of the projection data of the characters projected by the means (7), the reference position on the medium, and the number of bits between the central positions of the projection data of the characters closest to the reference position. Printing comprising means (8) and operation means (9) for converting the number of bits counted by the counting means (8) into a size and calculating a size difference between the center positions Position measurement method.