JPH02242480A - Correcting device for pattern film distortion - Google Patents

Abstract

PURPOSE:To correct the distortion in a short time with high quality by generating a pattern to be corrected by a CAD device, and supplying it to a distortion correction processing part and obtaining a pattern which is already corrected. CONSTITUTION:The CAD device 12 generates the pattern to be corrected and a pattern film where a reference pattern is printed is molded in conformity with a three-dimensional molding; and a distortion pattern is obtained by a distortion pattern image reader 11 and the distortion correction processing part 15 superposes the pattern to be corrected on this distortion pattern on a 1st three-dimensional coordinate system to obtain the mapping of the pattern on a 2nd two-dimensional coordinate system where the reference pattern is formed, thereby using this mapping as the pattern which is already corrected. Consequently, the correction of the pattern film, specially, the generation of the pattern which is already corrected is easily and accurately performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a picture film distortion correction device, particularly for correcting distortion of picture films used when adding pictures, characters, etc. to molded products having three-dimensional curved surfaces. Regarding equipment.

[Conventional technology]

In recent years, a simultaneous injection method has become popular, in which a printing film is placed in a mold at the same time as injection molding, and only the ink is transferred to the molded product. In this method, a pattern film with a pattern printed on it is prepared in advance, this pattern film is inserted between a male mold and a female mold, the pattern is aligned, and resin is injected from the male mold to form the mold. It generates things. The heat stretches the patterned film and deforms it along the female mold, and the pattern is transferred to the surface of the molded product at the same time as it is formed.

In such a simultaneous injection painting method, it is necessary to correct distortion of the pattern film. This is because, as described above, the patterned film stretches and deforms during molding, so that the pattern, characters, etc. on the patterned film are distorted and transferred onto the molded product. Conventionally, such distortion correction has been performed manually based on prototype products.

[Problem to be solved by the invention]

However, conventional manual distortion correction requires time and effort, resulting in high costs and does not allow for high-quality correction. In order to solve such problems, Japanese Patent Application No. 63-243545 and Japanese Patent Application No. 63-2
No. 90891 proposes a novel distortion correction device. It is an object of the present invention to further improve these distortion correction devices and to provide a picture film distortion correction device that can perform high-quality correction in a short period of time.

[Means to solve the problem]

The invention of Section 1 of the present application is a picture film distortion correction device in which when a two-dimensional picture film on which a reference pattern with a plurality of reference points is formed is molded into a three-dimensional shape to match a molded product, the reference pattern is a distortion pattern image reading device for reading an image of a distortion pattern obtained by distorting the molded product; A planar image input device that inputs the design to be added as a planar image, generates three-dimensional data representing the shape of the molded product, and assigns a planar image to the molded product based on this three-dimensional data and the planar image data. CAD that generates three-dimensional data representing the state, further projects the molded product to which a plane image has been allocated in a predetermined direction, and generates a pattern to be corrected based on this projected image.
a first coordinate system for recording the coordinate values of a reference point for the distortion pattern given by the device, the image processing unit, and the coordinate values of the pattern to be corrected given by the CAD device; A second coordinate system for recording the coordinate values of the reference points, and a mapping of the pattern on the first coordinate system to the second coordinate system based on the correspondence between the reference points in the distortion pattern and the reference points in the reference pattern. The present invention is provided with a mapping arithmetic device that calculates the mapping, and a corrected pattern output device that outputs the mapping determined on the second coordinate system as a corrected pattern.

The invention in Box 2 is a picture film distortion correcting device, when a two-dimensional picture film on which a reference pattern with a plurality of reference points is formed is molded into a three-dimensional shape to match a molded product, the reference pattern is a distortion pattern image reading device for reading an image of a distortion pattern obtained by the distortion of the molded product; an image processing unit that determines coordinate values of a reference point from the image read by the distortion pattern image reading device; A CAD device that generates three-dimensional data representing the layout of the pattern, projects the molded product with this pattern in a predetermined direction, and generates a pattern to be corrected based on this projected image, and image processing. a first coordinate system for recording the base and point coordinates for the distortion pattern given by the department and the coordinate values of the pattern to be corrected given from the CAD device; and the coordinates of the reference point for the reference pattern. a second coordinate system for recording values; and a mapping calculation device that calculates a mapping of the pattern on the first coordinate system to the second coordinate system based on the correspondence between the reference points in the distortion pattern and the reference points in the reference pattern. and a corrected pattern output device that outputs the mapping determined on the second coordinate system as a corrected pattern.

[For production]

According to the present invention, first, three-dimensional shape data of a molded product is generated by a CAD device, three-dimensional data in which a pattern is allocated to this molded product is generated, and further, based on this three-dimensional data, the pattern to be corrected is is generated. Subsequently, the pattern film on which the reference pattern is printed is molded to match the molded product. As a result, the pattern on the picture film becomes distorted. Therefore, the undistorted picture to be corrected is superimposed on this distorted pattern on the first coordinate system.

In the case of the present invention, this pattern to be corrected is given from a CAD device. On the other hand, a regular reference pattern is created on the second coordinate system. Then, based on the positional relationship of the corresponding reference points of both patterns created on the Ryoza Taneito,
A mapping of the picture on the first coordinate system is obtained on the second coordinate system. The image thus obtained is printed on a patterned film. The pattern on the pattern film is distorted as it is, but
If the pattern film is molded to match the molded product, the pattern applied will be a regular pattern without distortion, instead of the pattern film being distorted.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Basic Configuration of the Apparatus The present invention will be described below based on illustrated embodiments. 1st
The figure is a block diagram showing the configuration of a picture film distortion correction device according to an embodiment of the invention in Box 1 of the present application. The distortion pattern image reading device 11 is a device for inputting a distortion pattern as an image, and is composed of a COD camera, an ITV camera, or the like. As will be described in detail later, the CAD device 12 receives a planar image as a pattern from the planar image input device 12a, and
This is a device that generates a pattern to be corrected based on this.

The arithmetic processing device 13 is a device that corrects a pattern based on data input from these devices, and includes an image processing section 14 and a distortion correction processing section 15.

The image processing unit 14 has a function of extracting the position coordinates of each reference point based on the pattern input from the distorted pattern image reading device 11. The distortion correction processing section 15 includes the image processing section 1
It has a function of correcting the picture input from the CAD device 12 based on the data given from the CAD device 4. A storage device 16 such as a magnetic disk or magnetic tape is externally connected to the distortion correction processing section 1.5, and can store data created by an eccentric person, data calculated, and the like. The storage bag 16 may be incorporated inside the arithmetic processing unit 3. The corrected picture corrected by the distortion correction processing section 15 is outputted by the corrected picture output device 17. As this corrected picture output device 17, devices such as a plotter, dot impact printer, inkjet printer, thermal transfer printer, film recorder, etc. can be used. It is also possible to temporarily output the pig to a storage medium such as a floppy disk or magnetic tape, and then transmit it offline to another output device. In this case, the corrected pattern output device 1
7 is a drive device for each storage medium.

Basic principle of the device Next, the basic principle of this device will be explained.

As shown in FIG. 2, when the transfer film 2 is molded to match the molded article 8, the pattern is distorted as shown in FIG. 3. Therefore, as shown in FIG. 4(a), a square lattice pattern is printed on the transfer film 2, and the molded product 8 is
If this is actually molded according to the pattern, the transfer film 2 will stretch, and this pattern will be distorted as shown in FIG. 3(b).

The same effect can be obtained even if only the transfer film 2 is molded by suction into a female mold without actually creating a molded product. Here, an example using a square lattice pattern is shown, but any pattern may be used as long as it has a plurality of reference points. In the case of a square lattice pattern, each intersection of the lattice, that is, the quadratic point or reference point of each square.

The operator inputs a distortion pattern as shown in FIG. 4(b) using the distortion pattern image reading device 11. The read image data is subjected to image processing such as binarization processing and thinning processing in the image processing unit 14, and each intersection point (
The position of the grid point) can be detected. On the other hand, the operator is CA
The D device 12 generates data of a pattern to be applied to a molded product (a pattern to be corrected).

The distortion correction processing unit 15 generates a corrected pattern based on the data processed by the image processing unit 14, the data of the pattern to be corrected given from the CAD device 12, and the square grid pattern without distortion stored in advance. do. This principle is shown in FIG. The distortion correction processing section 15 is provided with two coordinate systems. The first coordinate system is given a distortion pattern P given by the image processing section 14, as shown in FIG. 5(a).

In reality, this distortion pattern P consists of intersection points (for example, Pl)
It is given as data consisting of a set of coordinate values. On the other hand, as shown in FIG. 5(b), the second coordinate system is given a regular square lattice pattern Q without distortion that has been stored in advance. This square lattice pattern Q is also given as data consisting of a set of coordinate values of intersection points (for example, Q□). Subsequently, in the first coordinate system, as shown in FIG. 5(a), a pattern to be corrected PP (letter "A" in this example) is superimposed on the distortion pattern P. This corrected picture PP is given from the CAD device 12. Here, a mapping calculation is performed to obtain a mapping QQ of the pattern PP to be corrected on the second coordinate system. This mapping operation can be performed based on the correspondence between the reference points of the distortion pattern P and the square lattice pattern Q. For example, reference points A-D in FIG. 5(a) correspond to reference points E-G in FIG. 5(b). Using this correspondence relationship, it is possible to find a corresponding point like point Q2 in Figure 5(b) even for a single point that is not a reference point, such as point P2 in Figure 5(a). can. In this way, for any point on the first coordinate system, its corresponding point can be found on the second coordinate system. "A")
can be found.

When the corrected picture QQ is determined in this way, the corrected picture output device 17 outputs it as a block copy. Based on this block copy, the distorted letters rAJ are printed on the transfer film 2.
As shown in FIG. 2, if molding and transfer are performed under the same conditions as before, the transfer film 2 will stretch under the same conditions as before, so the surface of the printed molded product 9 will be free from distortion. The letters rAJ will be transcribed.

Regarding the above processing, please refer to Japanese Patent Application No. 63-24354.
Since it is detailed in the specification of No. 5, please refer to that specification for the detailed contents.

Function of CAD device The feature of the present invention is that the pattern to be corrected is generated by the CAD device 12. This is very effective when the molded product has a more three-dimensional shape and a pattern is to be three-dimensionally allocated on the surface of the molded product. CAD device 12
For this purpose, it is sufficient to use a very simple boat fishing device. The operator uses this CAD device 12 to perform the following processing.

Now, we will explain the case of assigning a flat image such as a logo to a molded product whose three-dimensional shape has been determined as an example. First, the operator defines the three-dimensional shape of the molded product to the CAD device 12. In other words, three-dimensional data representing the shape of the molded product is generated within the CAD device.
For example, as shown in FIG. 6, an image 21 of a molded article is formed in a CAD device.

Next, the operator inputs a planar image such as a logo from the planar image input device 12a. This flat image input device 1
2a is an image input device for the CAD device 2;
Specifically, it is a device such as a scanner, a COD camera, or an ITV camera, and the distortion pattern image reading device 11 can also be used.

Subsequently, within the CAD device 12, this planar image is allocated to the image 21 of the molded product. This can be done, for example, as follows. First, a line of sight vector 22 is defined in a predetermined direction with respect to the image 21 of the molded product. This line-of-sight vector 22 may be determined to be the direction in which the molded product is most commonly viewed, that is, the direction that can be said to be the front of the molded product. Then, the input planar image 23 is brought into a plane perpendicular to this line-of-sight vector 22, and the pattern on this plane image 23 is projected onto the surface of the image 21 of the molded product along the direction of the line-of-sight vector 22. That's what I do. In this way, an image of a molded product with a pattern on its surface is created. Also, line of sight vector 2
2 and the plane image 23 are not necessarily perpendicular,
It may be changed to any angle. Of course, this is CA
This is performed as a calculation within the D device 12, and in reality, three-dimensional data representing a state in which a plane image is allocated to a molded product is generated.

The advantage of this device is that it can display molded product images with patterns assigned on a display, and can also be used in CAD
The point is that the device 12 can output in hard copy form. The operator can check the status of the pattern layout by looking at the display or hard copy.

Furthermore, if the pattern is prepared in advance (flat image 23) or has a very complex shape, it is easier to input the entire pattern as a raster image and assign it, rather than manually drawing each line in CAD. becomes easier.

Next, a method for creating a pattern to be corrected to be input into the first coordinate system will be explained. First, if the molded product 9 shown in FIG. 2 is relatively thin and has no pattern on the side, you only need to consider the pattern seen from the top.
In image 21 of the molded product shown in the figure, since it has a more three-dimensional shape, the design is also assigned to the side, and when considering the design seen from the top, the design on the side is reduced in one direction. Therefore, accurate display is not possible and is insufficient.

Therefore, the pattern assigned to the surface of the image 21 of this molded product is projected onto several surfaces. In this example,
The image 21 of the molded product as shown in FIG. 7(a) is
three directions AA, BB, CC.

Project to DD and EE. For example, by projecting in the direction BB, a projected image on the projection plane TB is obtained, and this projected image best represents the pattern on the surface B. In the end, five projection images are obtained using five projection planes T A - T E (only TB is shown in the figure). Note that the projection planes do not necessarily have to be orthogonal; for example, it is also possible to take a projection plane parallel to the plane B and project it in the direction BB2, as in the projection plane TB2 in FIG. 7(b). It is. The five projection images obtained in this way are each separately provided to the distortion correction processing section 15 as a pattern to be corrected. On the other hand, the distortion pattern image reading device 11 projects distortion patterns on the same five projection planes for an actual molded product, and inputs the five distortion patterns. In this manner, the distortion correction processing unit 15 separately performs distortion correction on the five sets of distortion patterns and the pattern to be corrected, thereby obtaining five corrected patterns. Finally, by combining these five corrected patterns, a final corrected pattern is obtained. This synthesis process is detailed in the specification of Japanese Patent Application No. 33-290891, so please refer to that specification for details.

The invention of Section 2 of the present application The invention of Section 1 of the present application has been described above with reference to one embodiment. Next, the invention of Section 2 of the present application will be explained. The invention of Section 2 of the present application is
This configuration is obtained by removing the planar image input device 12a from the configuration shown in FIG. In the invention of Section 1 of the present application, a pattern such as a logo is captured by the plane image human-powered device 12a and processed by the CAD device 12, but in the invention of Section 2 of the present application, the pattern itself is created by the CAD device 2. become. The picture created in this way can be confirmed on a display or hard copy, as described above. Two specific examples of effective pattern creation methods will be described below.

(1) Method of using the line of intersection of two planes Generally, when two planes are defined, a CAD device is provided with a function to find the line of intersection of the two planes. If you use this function to generate a pattern, you can generate a pattern very easily. Now, as shown in FIG. 8, let us consider a case where an image 24 of a molded product is defined inside the CAD device 12, and an operator uses the CAD device to buzzer-print a pattern on the surface of the molded product. In this case, if the patterns were designed separately for the surface A and surface A2, the patterns would not connect well at the connection line m of the surfaces, and the design would tend to be unnatural.

Therefore, surface B is defined, and this surface B and each surface A (n=1.
2. ), you can easily create a natural design by using the intersection line m. In particular, if we take a plane as surface B, place a viewpoint at any point on this surface B, and observe the image 24 of the molded product from this viewpoint,
The intersection lines rn 1 and m 2 are always on a straight line, and there is an effect that the two connecting points R look natural without becoming a broken line. In the example in Figure 8, plane A and plane A2 are in contact at the connecting line m, but this effect becomes more pronounced when plane A1 is connected to plane A2 by a gently curved surface. . Many of the designs applied to the surface of products have line motifs, such as striped patterns, and if the design is based on one intersection line m ] -, m 2 , ..., it will look natural. Patterns can be easily created. You will understand that by moving plane B in parallel, you can easily create a striped pattern. Although plane B may be defined in any direction, it is preferable to define plane B along the line of sight in which the product (molded product) is most commonly observed. This is because the design will look most natural when viewed from the direction in which it is most commonly viewed.

(2) Method of utilizing the shape of the molded product If the molded product has a characteristic shape such as grooves or edges,
By generating a pattern using that shape, you can create a natural-looking design very easily.

For example, as shown in FIG. 9, if a circular groove 26 is formed in the image 25 of the molded product, this circular groove 26
If the pattern 27 is applied according to the pattern 27, it will be easy to design and the design will look very natural.

The present invention has been described above with reference to several embodiments, but in short, the main point of the present invention is that a pattern to be corrected is generated by a CAD device, and this is fed to a distortion correction processing section to obtain a corrected pattern. Various other embodiments are also possible.

〔Effect of the invention〕

As described above, according to the present invention, a pattern to be corrected is generated by a CAD device, a pattern film on which a reference pattern is printed is molded to match a molded product to obtain a distortion pattern, and a pattern to be corrected is added to this distortion pattern. Superimposed on the first coordinate system,
A mapping of the pattern on the first coordinate system is obtained on the second coordinate system in which the reference pattern is created, and this mapping is used as the corrected pattern, making it easy to correct the pattern film, especially to create the pattern to be corrected. , and be able to do it accurately.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of a pattern film distortion correction device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the simultaneous injection painting method, and FIG. 3 is a diagram showing the distortion caused by simultaneous injection painting. It is a figure showing a transfer film. Fig. 4 is a diagram showing how the reference pattern is distorted by the simultaneous injection painting method, Fig. 5 is a diagram showing the principle of distortion correction processing by the device of the present invention, and Fig. 6 is a diagram showing how the standard pattern is distorted by the simultaneous injection painting method. FIG. 7 is a diagram showing a method for generating three-dimensional data of a molded product, which is performed in the CAD device used in the apparatus of the present invention, and FIG. FIG. 9 is a diagram showing a design method using intersection lines performed in the CAD device used, and FIG. 9 is a diagram showing a design method using the shape of a molded product performed in the CAD device used in the device of the present invention. 21... Image of molded product, 22... Line of sight vector, 23... Planar image, 24... Image of molded product, 2
5. Image of molded product, 26. Groove, 27. Pattern, P. Distortion pattern, Q. Reference pattern, PP.
・Corrected picture, QQ...Corrected picture. []

Claims (2)

[Claims] (1) An image of a distorted pattern obtained when the reference pattern is distorted when a two-dimensional patterned film on which a reference pattern with multiple reference points is formed is molded into a three-dimensional shape to match a molded product. a distortion pattern image reading device for reading the distortion pattern image reading device; an image processing unit that determines the coordinate values of the reference point from the image read by the distortion pattern image reading device; and a plane for inputting a pattern to be applied to the molded product as a planar image. an image input device, generating three-dimensional data representing the shape of the molded product, and generating three-dimensional data representing a state in which the flat image is allocated to the molded product based on the three-dimensional data and the data of the flat image; a CAD device that further projects the molded product to which the planar image is allocated in a predetermined direction and generates a pattern to be corrected based on the projected image; a first coordinate system for recording coordinate values of a reference point and coordinate values of a pattern to be corrected given from the CAD device; and a second coordinate system for recording coordinate values of a reference point for the reference pattern. a mapping calculation device that calculates a mapping of a picture on the first coordinate system to the second coordinate system based on the correspondence between a reference point in the distortion pattern and a reference point in the reference pattern; A picture film distortion correction device comprising: a corrected picture output device that outputs a mapping determined on a two-coordinate system as a corrected picture. (2) When a two-dimensional patterned film on which a reference pattern with multiple reference points is formed is molded into a three-dimensional three-dimensional shape to match a molded product, an image of a distortion pattern obtained when the reference pattern is distorted. a distortion pattern image reading device for reading the distortion pattern image reading device; an image processing unit that determines the coordinate values of the reference point from the image read by the distortion pattern image reading device; and a state in which a predetermined pattern is allocated to the surface of the molded product. A CAD device that generates three-dimensional data, projects a molded product to which this pattern is assigned in a predetermined direction, and generates a pattern to be corrected based on this projected image; a first coordinate system for recording coordinate values of a reference point and coordinate values of a pattern to be corrected given from the CAD device; and a second coordinate system for recording coordinate values of a reference point for the reference pattern. a mapping calculation device that calculates a mapping of a picture on the first coordinate system to the second coordinate system based on the correspondence between a reference point in the distortion pattern and a reference point in the reference pattern; A picture film distortion correction device comprising: a corrected picture output device that outputs a mapping determined on a two-coordinate system as a corrected picture.