JPS585606A - System for measuring slant amount of document - Google Patents

Abstract

PURPOSE:To measure the slant amount of document accurately even through it has irregular parts due to the work of perforation by obtaining the coordinates of the point from the read outputs corresponding to a plurality of detecting elements of an opticl detecting means which is arranged so as to cross the moving direction of the document. CONSTITUTION:On a segment AB of about 5mm. which is included in the running surface of the document 1 and forms a right angle with the running direction (shown by an arrow) of the document 1, 48 pieces of detecting elements with a diameter of 0.105mm. are closely arranged with two fixed points 12 and 13 as centers. The irregular parts 5 on a front side 4 of the document 1 have a width of 1mm. and a pitch of 6mm.. A scanning part 20 performs the main scanning in the direction at a right angle with the running direction of the document 10 (1) and the secondary scanning in the opposite running direction. The black and white data is converted into the binary data and stored in a picture memory 40 through a gate 30. A microprocessor 50 checks the stored contents bit by bit. The central coordinates of the main scanning line which detects the front side 4 comprising 24 bits or more are detected twice, and the slant amount of the document 10 is obtained regardless of the irregular parts 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an optical dial in an optical dial plate device. The present invention relates to a method for measuring the amount of inclination of a form in a paper reading device, etc.

For example, in an optical character reading device, a handwritten character or a printed character is generally written in a rectangular shape marked with i. The scanning direction is set as the scanning direction, and the scanning direction is set as the scanning direction f:''M.The scanning direction is set as the scanning direction.

Observation pattern obtained by scanning σ characters for one digit [- After mapping the page surface onto the memory, observation patterns for one character are sequentially cut out, and if necessary, preprocessing is performed on them. , that bang I! # Characters are continued by extracting # signs and comparing them with a reference pattern prepared in advance. prints a character entry frame for each character, and the person filling out the form writes the characters in such a way that they do not protrude from this frame, and
The optical character reading device uses the coordinate system on the form to store the positions and dimensions of all character frames in i'c1wI.

Prior to scanning the characters on the form, the running position and the amount of inclination of the form are measured, and these values are used to determine the cutting position of the observation pattern using i. Figure 1 is a field diagram of a conventional example of the form inclination measuring method. Two fixed points 2 and 3 are defined on a straight line included in the running surface of form P 1 and orthogonal to the running direction of form I (indicated by an arrow). .

The amount of inclination of the @ system is determined by substituting the running length of the book Jll while the side 4 of the book Jll passes through the fixed points 2 and 30 points t-s. This method is nothing but measuring the coordinates of two points on the form and determining the amount of inclination of the form.

However, the slit-like finish? As shown in FIG. 2, on the side of the @ tag that has been applied and separated, a large number of irregular portions 5 are present in regular patterns. This irregular portion 5 often has a convex shape, and its height may reach two dimensions.

When the front edge 4 of the form l is in the form shown in Fig. 1 and the front edge 4 of the form l is shaped as shown in Fig. 2, when the straight line part 6 passes through the deviation of the two points 2 and 3, the amount of inclination of the form l is can be determined accurately, but 9For example, if a straight section 6 passes through one fixed point 2 and an irregular section (convex) 5 passes through the other fixed point 3, it is difficult to correctly determine the amount of inclination of the form 1. No color. As a result, the problem that the observation pattern was not accurately cut out and therefore the characters could not be read accurately occurred.

The present invention has been made to solve such problems, and its purpose is to cut the edges of the @ tag with perforations and to cut it.
To provide an optical character reading device ft which can accurately measure the amount of inclination of a form and can also accurately read characters.

In order to achieve the above object, one aspect of the present invention is as follows.

In a form reading device, which has an elementary light detection means disposed so as to intersect with the moving direction of a relatively moving form, and an image memory that stores the read output of the light detection means, two points from the front edge of the form are detected from the edge reading output. The coordinates of each point are obtained from reading outputs corresponding to a plurality of detection elements of the light detection means when detecting the amount of inclination of the form.

The present invention will be explained in detail below using examples.

, 313 is a principle diagram of an embodiment of the present invention, in which two fixed points 12 and 13 on a straight line included in the running surface of the form 1 and orthogonal to the running direction (indicated by an arrow) of the form 1 are fixed on each O fixed point. Line segments AIl and CDj that are centered and intersect with the document running direction:
Each 484d4O@intelligence element is arranged in a row. The diameter of the detection element is 0.105 m1''e6, and the length of each line segment is about 5 M.On the other hand, the front end side 4 of the form l to be used
The width of the irregularity -5 existing in Tol) is 11, and the irregularity 6865 occurs at a pitch of 611II11. However, the length of each line segment on which the sensing elements are arranged is more than twice the width of the irregular portion 5 and shorter than the pitch at which the irregular portion occurs. In general, as in the above example, the width of the irregular part 50 that occurs on the side 4 of the form 1 which has been perforated and separated is about 10 times the diameter of the sensing element] and 5 times the length of the straight part 6. one part
That's about it. Therefore, if a detection element is provided under the above conditions, as long as the angle between the line segment and the front edge of the form is not very large, there will be t-2 or more irregularities on each line segment. without passing through.

Therefore, the range through which the irregular portion passes does not occupy more than half of the length of each line segment. With the detection elements arranged in this way, about half of the detection elements on one line segment
The amount of inclination of the form is measured by measuring the running length of the form from when the edge of the layer Q is detected until about half of the sensing elements on the other line segment detect the edge of the as# end. I can do that.

The above has been explained using the principle diagram of the present invention. This will be explained in detail. Essay 4
The figure is a block diagram showing Ill deposition of a specific embodiment. The scanning unit 20 scans 1f while the form is running, with the main scanning direction being perpendicular to the running direction of @Yo, and the direction opposite to the form running direction being the secondary direction.

Convert black and white information 1 to 211 fit information, goo) 30'i
The image data is stored in the image memory 40 via the image data. The microprocessor 50 reads the contents of the image memory 40 and the scanning unit 20.
When the main scan has been completed a predetermined number of times, the dart 30 is covered and the form feeding motor 70 is stopped via the free system run #11 gear 60 to stop the running of the form 100. As a result, I am home! On the sled 40, two measurements are made of the front and rear sides of the front edge of the form. The scanning unit 20 has 2,048 photodetecting elements arranged in a one-dimensional manner, which allows for main scanning with a maximum length of 211 sU.
The length of 0.105 m in the main scanning direction corresponds to one element of the photodetector. Also - scan is 0.1051! It is performed at a pitch of l. Therefore **7F! Line direction is α1
Divided into 06 square grids, each with one section!' This is different from the explanatory diagram of the 3rd generation described above, which corresponds to the O1 bit on the memory. .

The pattern of the front edge of the form stored on the fifth WJFi image memory 40? 11 is an explanatory diagram of a scanning pattern performed by the 1l-i microprocessor 50. FIG. In the following explanation, VcF! on the m-image memory will be described. , the white part of the form is stored as Fii, and the part outside the form is stored as O. The microprocessor 50 stores the storage content t- with a width of 48 bits centered on [MUU' t-, which is parallel to the direction corresponding to the form scanning direction (indicated by the arrow), and the direction perpendicular to UU is the main scanning direction.
The UU direction is scanned as the sub-scanning direction, and the stored content t-
Examine each bit one by one, and find the center X of the first main scanning line where l of 24 bits or more is detected in one main scanning.

The stored contents of the 48-bit width centering on the next busy line*UU' at a certain distance mvv' t- are scanned in the same way24
Find the center Y of the first main scanning line to be detected. Find the amount of inclination of the form from the X and YO data obtained in this way. In the example of FIG.
Although the irregularity s5 is included in the 48-bit width centered at , the position of Y coincides with the intersection of the straight line portion 6 and the straight line vv.

As described above, the present invention has the advantage that even if there is an irregular part due to perforation on the side where the amount of inclination of the form is to be detected, the amount of inclination of the form can be accurately measured.

[Brief explanation of the drawing]

Figure 1 is a diagram of the principle of the conventional example, and Figure 2 is a diagram of the defect that occurs on the side of the lla ticket. 1. FIG. 3 is a principle diagram of an actual example of the present invention, and FIG. 4 is a block diagram of the configuration of an embodiment of the present invention. 10 is a form, 20 is a storage section, and 30 is a game) , 40ti
An image memory, 50 a microprocessor, 60 a form running control section, and 70 a form feeding motor. Further, FIG. 5 is an explanatory diagram of the non-inventive implementation sequence. Dice 1 Kojudo Zuto 3 Sen%47 d power

Claims (1)

[Claims] A light detection means arranged so as to intersect with the direction of movement of a relatively moving form, and an Im that stores the reading method of the light detection means.
Elephant mesori and fbMM reading equipment! In order to determine the amount of inclination of #1JII by detecting the coordinates of two points at the front end of the form from the am output, the coordinates of each point are obtained from the reading method corresponding to the plurality of detection elements of the light detection means. Kotot-Featured book Jll! Inclination measurement method.