JPS6133530A - Coordinate reader - Google Patents

Abstract

PURPOSE:To improve the accuracy of reading by incorporating a CCD in a coordinate reader, detecting the coordinates of a current position by two or more detecting means or the like and operating and numerizing the parallel movement and turning angle of a cursor part. CONSTITUTION:The coordinate reader is provided with a reading part 3 on a linear graphic 2a drawn on a drawing 2 laid on a plane base plate 1. A transparent window 3a for the visual field of a camera is formed on the center part of the reading part 3 and detecting coils are embedded on its both the sides. A CCD camera 6 is arranged on the upper part of the transparent window 3a to convert the linear graphic 2a photoelectrically through a photoelectric converting element 8. Visual data through the camera 6 are numerized by a picture processing part 20. The positional information (the distance of parallel movement and the angle of rotation) of the camera 6 is obtained by the detecting coils 4, 5 and the coefficient of affine transformation is calculated by an arithmetic circuit 21. An output signal F corresponding to the coefficient and the numerized output signal B are operated by an arithmetic circuit 23 to obtain a conversion signal D every movement.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a line figure coordinate reading device for inputting a numerical value of a line figure for computer processing.

<Conventional technology> In recent years, technologies such as CAD/CAM have developed significantly, and in order to improve design efficiency, these technologies record conventional design data in computer memory, and when creating a new design, use that database. It's a method.

As is well known, computers store data as numerical data, and cannot store drawings in their original form. Therefore, it is necessary to read the coordinates of line figures drawn on the drawing. Digitizers and the like have traditionally been used as devices for this purpose, but these devices consist of a flat board on which drawings are placed, and a reading unit that specifies coordinate points and reads the coordinates. .As a reading section,
A stylus and cassole are provided. There are also mechanical and electromagnetic methods, but since these are known methods, their details will be omitted.

<Problems with conventional technology> But these disadvantages point to each coordinate point.

It is necessary to specify and read the points. For example, when inputting a line segment that has many curved points and two bent points, such as a hand-drawn figure, it is necessary to input each broken point, and for curved parts, it is necessary to input each line segment that can be regarded as a straight line. , and it requires a lot of effort.

<Objects and Structure of the Invention> In view of the above-mentioned drawbacks, the present invention aims to provide a coordinate reading device that can more easily digitize and read special numbers, handwritten figures, etc.

That is, the apparatus provided by the present invention digitizes the figure within the field of view of a CCD camera, synthesizes the created data for each camera field of view, and completes the entire figure data. Also, how to quantify figures within the camera field of view? Therefore, in the past, the camera field of view was always moved in parallel to the XY axis directions, but in the present invention, it is configured so that it can be rotated, and the coordinate positions on the flat substrate can be detected in at least two locations. The reading unit is equipped with a device capable of Hereinafter, the coordinate reading device of the present invention will be explained based on the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention. In other words, the coordinate reading device in FIG. A drawing 2 is placed on a substrate 1, and a reading section 3 is provided on a line figure 2a drawn on the drawing 2.

The flat substrate 1t is provided with wires that can be energized in the XY-axis directions and are laid out in the shape of a grid pattern.

Since this device has the same configuration as generally well-known digitizers and tablets, its explanation will be omitted here.

The reading unit 3 is provided with a substantially square transparent window 3a at the center □ as a camera field of view. On both sides of this transparent window 3m are coils 4.coils 4.coils 4.coils 4.coils 4.coils 4.coils.coils 4.coils 4.coils.coils 4.coils.coils 4.coils.coils 4.coils.coils 4.coils.
5 is buried. The center positions of the coils 4 and 5 have a known geometric distance from the center position of the transparent window 3m, that is, the cursor section.

This coil 4.5 corresponds to the cursor part when configuring a conventional digitizer, tablet, etc.
Furthermore, a camera 6 is provided above the transparent window 3Jl of the reading section, and a charging conversion element 8 provided in this camera 6 converts the line figure 2a drawn in FIG. 2 into light through a lens 7. Further, a support rod 9 for raising and lowering the camera 6 in order to focus the line figure 2a is also provided on the reading unit.

Note that 10 is an arm that supports the lamp 11 that illuminates the transparent window 38 portion, 12 is a group of operation switches, and 13 is an electric wire for transmitting signals to the arithmetic circuit unit and image processing unit, which will be explained later in FIG. 2. It is.

Next, the functions of the reading coordinate system having these configurations will be explained with reference to Figs. 2 to 4. Fig. 2 is a block diagram, and Fig. The position of the cursor section is shown, and FIG. 4 shows a processing flowchart.

1 to 4, the reading unit 3 is first set by manual operation at the starting point of the line figure 2m drawn on the drawing 2. As shown in FIGS.

Next, for example, 256
Camera visual field data consisting of a 6-bit pixel configuration is provided to the image processing section 20. In this image processing unit 20, the numerical value 0 is used to discriminate between white and black in the coordinate system of the camera field of view.
．． 1.266 data, that is, known numerical conversion such as thinning of raster data and connection after thinning is performed. here,
The advantages of converting raster information into numbers are as follows.

(1) For example, by setting the center of the camera field of view as the origin, each bit of the photoelectric conversion element 8 can be easily arranged in geometric correspondence.

(2) When performing coordinate Hairfin transformation of camera field of view white information on a flat board 1 system, digitized data is used rather than raster information.
In other words, vector data has more compressed information and a corresponding reduction in conversion time, making it possible to speed up the reading process.

Further, position information E indicating the position of the camera 6 with respect to the flat substrate 1 is provided to the arithmetic circuit 21 . This location information B is
Camera 6 obtained with at least two or more coils according to the invention, coils 4 and 5 in the figure
The amount of translation and rotation angle of is shown.

In the arithmetic circuit 21, affine transformation coefficients are calculated from coordinate information of two locations on the coil 4.5.

This makes it possible to detect the rotation angle of the camera field of view, which was previously impossible. In other words, the coordinates of the two points of the camera 6 position in the coordinate system on the planar substrate 1 are (Xa, 7)
, (Xk, %). This detection is carried out at symmetrical positions with respect to the center of the camera's field of view, with a constant distance between them. Also, the coordinates within the camera field of view (cg.

cy), the coordinates in the planar substrate 1 (”* *Ty
) is expressed as follows.

That is, in this ζ, Pl#P1a, Psx~Pmaro3 represent arbitrary affine constants, and PumPsmm(xh -xa
)/L, -Px*-Pgt=CYh-1m>/Le
PsswCxm+xh”)/2*Pss=Cya+yh
)/2.

Here, six values are obtained for the affine transformation coefficients, and they can be easily calculated by selecting L as a constant that is easy to calculate.

An output signal F corresponding to the missing number ζ and the affine transformation coefficient calculated by the arithmetic circuit 21 is given to the arithmetic circuit 22 .

In the arithmetic circuit 22, an output signal B of the coordinate system of the numerical ratio data in the camera visual field given from the image processing unit 20', 6),
A calculation is performed with the above-mentioned output signal F, and field-of-view data value conversion is performed to determine at which coordinate position the line figure 2a within the camera field of view is expressed in the coordinate system on the plane substrate 1. Then, the output signal C of the converted visual field data value is given to the arithmetic circuit 23#. Here, as shown in Fig. 3, it is determined whether the outermost frame within the camera field of view, that is, the field of view boundary data, is part of the data within the field of view that has already been obtained, and these lines are drawn. be exposed. This situation will be explained in detail based on FIGS. 3 and 4.

In Figures 3 and 4, 8a-1, 3a-s, 3
a-s indicates the camera field of view (hereinafter simply referred to as field of view), and P1 to pH indicate points at both ends of the line segment obtained with respect to the camera position.

In reading the line figure 2m shown in FIG. 1, boundary data Pa is first registered for the point Ptζ in the field of view 3m-, and a line segment 1K of PxPs is obtained.

Next, the camera field of view is sequentially translated and rotated to sequentially move to fields of view 3ss-x and 3a-s. At this time, the visual line segment C is obtained, the boundary data point P1 is registered with respect to the point P6 in the visual field, and the line segment C of P4Fg, P@P
A line segment 1- of y is obtained. Furthermore, for the first time in field of view 311,
The point PI@jd in the field of view and the point P6 and pH of the boundary data are gold and silver for the point P in the field of view, and the line segment ms of PsP.

A line segment sr of PsPxo and a line segment 1- of p·PH are obtained.

Next, these line segments At-Im will be explained with reference to FIG.

When the camera head is moved from the field of view 3-1 to the field of view am-hawk, in step 2, the area of the triangle, that is, Δ
Ps@PsPa, ΔP**P4Pi, ΔPseP4Pg
, ΔpieP@Pv.

In step ①, it is determined whether the area is zero or not. And if it is zero in step ■,
I think there is an overlap between the lines, so I looked at it.

Two straight lines are generated for field 31-■. That is, when the subgon area generated by the point Px and one line segment is zero, the point Ps is on the line segment 1s.Therefore, two line segments Pars and P4 are generated.

At step Φ, the straight lines Psis, PIPa, PI
The longest straight line PrPa among P4 becomes a new line segment.

Note that the boundary data of the visual field 31-1 is within the visual field 3 and does not overlap with the boundary data of the visual field 3a-2. If the songs overlap, move the camera and view 3a-1.
The boundary data of is within the field of view 3 to 3.

Freezing, if the area is not zero at step ①, line segments As and Am are in the field of view 3a-2 at step 0.
Determine whether or not the boundary data is within the boundary data, and proceed to step ■
, we obtain a new line segment. In other words, point Pg and line segment jm
, point P! Since the areas of the triangles at the 142 point PR and the line segment entrance are not zero, the above line segment 1 is used as a new line segment.
3 to 18 remain as they are.

Also, in order to read data in the field of view 3a-3, step
is registered.

Next, when the camera head is moved from field of view 3 total 2 to field of view 3 to 3, calculations are performed sequentially from step ■ to step ■ as described above, and the straight line Psis bottle and line segment i
t, As is obtained and the point pH is registered.

Note that this device can also be used to read conventional line figures. For example, if the arrangement is made such that the coordinates of the midpoint of the two coils 4.5 indicate the center position of the cursor section,
The camera 6 is not required, and it is possible to read the points of the line figure.

Further, although the reading section 3 is provided with a coil 4.5 as means for detecting the current position of the reading section 3, any means may be used as long as the current position of the reading section 3 is known. Furthermore, the relationship between the dimensions of the line figure 2a and one dot of the photoelectric conversion element 8 is determined by changing the magnification of the lens 7 or the like. Also,
Even if a microprocessor or the like is used in the arithmetic circuit explained in FIG. 2, the above-mentioned functions can be fulfilled.

In this way, a signal that converts data such as a straight line into data based on the coordinate system on the flat substrate 1 each time the reading section 3 moves is sent to the arithmetic circuit 23. and stored in, for example, an electronic computer.

<Effects of the Invention> As explained above, according to the present invention, the coordinate reading device
In addition to incorporating a camera head consisting of a CD,
By providing means for detecting the coordinates of the current position in at least two locations, calculating the parallel movement and rotation angle of the cursor section, and converting them into numerical values, it is possible to solve the problem of reading curved sections, which previously required considerable effort. reduced. In addition, the cursor part previously only moved parallel to the X and Y axes, but by making it possible to rotate it, it is now possible to subdivide curved parts, which not only improves reading accuracy but also increases reading speed. The overall line figure reading time has been shortened.

Therefore, the coordinate reading device according to the present invention is extremely useful in practice because it is easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the coordinate reading device according to the present invention, FIG. 2 is a block diagram, FIG. 3 shows the position of a cursor section that moves along a line figure, and FIG. 4 shows processing. A flowchart is shown. DESCRIPTION OF SYMBOLS 1...Flat substrate, 2a...Line figure, Dan...reading part, 3a...Transparent window, 6...
...Camera, 8...Photoelectric conversion element.

Claims (1)

[Claims] A planar substrate for reading coordinates, a reading section that moves on the planar substrate, and the reading section includes a camera provided above a transparent window for reading line figures, and a photoelectric conversion element provided in the camera. , a device comprising means for detecting the coordinates of the current position of the reading section on the flat substrate at least at two or more locations on the reading section; At the same time, the current position of the reading section is calculated by calculating the amount of parallel movement and rotation angle with respect to the coordinate system on the planar substrate, and the data such as the straight line is converted into a numerical value for each movement of the reading section. A coordinate reading device characterized in that the figure in the field of view of the transparent window is synthesized by converting the data into data according to the above coordinate system each time the reading unit moves.