JP2012089089A - Image pattern creation method, creation apparatus and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create an accurate image pattern for obtaining, from texture drawn on a surface of a real solid object, the identical texture through transfer to a solid object having the same shape feature.SOLUTION: An image pattern creation method includes the steps of applying a reference pattern to a first solid object having the same shape feature and the same scale as a solid object, acquiring three-dimensional information and texture information for the first solid object, acquiring three-dimensional information and texture information for a second solid object which has the same shape feature as the first solid object and with which texture is drawn on the surface thereof, acquiring image conversion information for converting corresponding points between the reference pattern and the texture information for the first solid object, acquiring three-dimensional coordinate transform information for performing transformation between the three-dimensional information for the first solid object and the three-dimensional information for the second solid object, and using the acquired information to produce an image pattern by projecting the texture information for the second solid object on a plane having the same two-dimensional coordinate system as the reference pattern.

Description

  The present invention relates to an image pattern creation method, a creation apparatus, and a computer program to be applied to the surface of a three-dimensional object.

  Conventionally, various methods have been used to manufacture a three-dimensional object having a texture or a pattern on its surface.

  For example, in film molding, a film on which an image pattern is drawn is heated and softened, and this is press-molded by vacuum or compressed air to form a three-dimensional shape.

  In film insert molding, the film shape is adjusted and then inserted into a mold for resin molding to form an image pattern on the surface of the resin molded product.

  In in-mold molding, a film on which an image pattern is drawn is sandwiched in a mold for molding, a resin is injected into the mold to perform molding, and at the same time, the image pattern is transferred to the surface.

  In these methods, the film is pressed along the surface of the mold at the time of molding, but depending on the shape of the mold, the film stretches locally, so the surface of the three-dimensional object with the image pattern drawn on the film distorted Will be transferred.

  Therefore, it is necessary to prepare an image pattern of the film in consideration of deformation during transfer. The amount of deformation of this transfer pattern becomes very complicated depending on the combination of conditions such as the shape of the mold and the pressure and heat applied during transfer. Therefore, the pattern is deformed and the transfer is actually performed, and a transfer pattern in which a correction is made to a portion not intended is made again. Since it is necessary to repeat such operations many times before the transfer pattern is completed, a great amount of labor is required.

  On the other hand, a method for generating an image pattern on a film using a three-dimensional CAD has been proposed (Patent Document 1). According to this, in-mold molding is actually performed using the lattice pattern, and the lattice pattern transferred to the surface of the molded product is photographed. On the three-dimensional CAD, an image without distortion is superimposed on the captured lattice pattern, and the pattern is mapped onto the regular lattice pattern by taking correspondence between the lattice pattern and the pattern. The mapped pattern is used as an image pattern on the film.

Japanese Patent Laid-Open No. 2-242481

  However, in the case of the method disclosed in Patent Document 1, it is difficult to accurately match the position and orientation of the captured grid pattern and the picture, and it is accurate when transferred using the created image pattern. An image may not be obtained.

  That is, in the method of Cited Document 1, the correspondence between the image (grid pattern) obtained by photographing the surface of the molding and the image (picture) drawn on the three-dimensional CAD is based on the photographed position and orientation and the three-dimensional image. The premise is that the positions and orientations for displaying the transfer results of the pattern generated by CAD are the same. However, it is extremely difficult to accurately match the position and orientation with only the information of the two-dimensional image obtained by photographing.

  In addition, the design data on the 3D CAD and the three-dimensional object actually molded with resin are almost inconsistent with each other due to the effects of shrinkage and shrinkage of the resin, and it is inevitable that a slight deviation occurs. . Therefore, since it is necessary to consider such a shape difference in order to match the position and orientation, it is actually impossible to match the position and orientation.

  The method of Patent Document 1 is based on the premise that an image (picture) created by three-dimensional CAD is used as the target image pattern, and an image (texture) drawn on the real object cannot be used as a target. .

  The present invention has been made in view of the above-described problems, and is an accurate method for obtaining the same texture by transferring a texture (image) drawn on the surface of an actual three-dimensional object to a three-dimensional object having the same shape characteristics. The purpose is to create an image pattern.

  The method according to the present invention is a method of creating an image pattern to be applied to the surface of a three-dimensional object, the step of applying a reference pattern to a first three-dimensional object having the same shape characteristics and the same scale as the three-dimensional object; , Obtaining three-dimensional information and texture information about the first three-dimensional object to which the reference pattern is applied, and a second three-dimensional object having the same shape characteristics as the first three-dimensional object and having a texture drawn on the surface Obtaining three-dimensional information and texture information about an object; obtaining image conversion information for converting corresponding points between the reference pattern and texture information about the first three-dimensional object; A step of acquiring three-dimensional coordinate conversion information for performing conversion between three-dimensional information about the first three-dimensional object and three-dimensional information about the second three-dimensional object. Then, using the image conversion information and the three-dimensional coordinate conversion information, the texture information about the second three-dimensional object is projected onto a plane having the same two-dimensional coordinate system as the reference pattern to generate an image pattern And a step of performing.

  According to the present invention, it is possible to create an accurate image pattern for obtaining the same texture by transferring the texture drawn on the surface of the actual three-dimensional object to the three-dimensional object having the same shape characteristics.

It is a block diagram which shows the schematic structure of the image pattern production apparatus of this embodiment. It is a block diagram which shows the example of a structure of a process part. It is a flowchart which shows the flow of in-mold shaping | molding. It is a figure which shows the state of the metal mold | die in in-mold molding. It is a figure which shows the example of the image pattern formed in the film. It is a figure which shows the molded product by two types of metal molds from which a shape differs, and each. It is a figure which shows the example of the target texture and the image pattern correct | amended for it. It is a flowchart which shows the flow of the production method of the image pattern of this embodiment. It is a figure which shows the flow of the production method of the image pattern of this embodiment. It is a figure which shows the flow of the production method of the image pattern of this embodiment. It is a figure which shows the example of the lattice point of a reference | standard pattern. It is a figure which shows the example of the lattice point of the texture of a 1st solid object. It is a figure which shows the example of image conversion information. It is a figure explaining the example of the process which produces | generates an image pattern. It is a figure which shows the example of an image pattern and the texture of a molded article. It is a figure which shows the other example of the target texture and the image pattern correct | amended for it. It is a figure which shows the example of the method of measuring the elongation amount of a film. It is a figure which shows typically the mode of the color fading by the elongation of a film. It is a figure which shows the polygon which comprises the surface of a solid object.

  In the present embodiment, a three-dimensional object (three-dimensional object RR) having the same shape characteristics from a texture (including images, designs, patterns, designs, designs, etc.) drawn on the surface of the actual three-dimensional object (second three-dimensional object RB). A method and apparatus for creating an accurate image pattern for obtaining the same texture by transferring to () will be described.

  The image pattern created according to the present embodiment takes into account the deformation of the texture due to transfer during in-mold molding or the like.

  Further, by obtaining the elongation amount of the film for transfer from the three-dimensional distance between the lattice points of the reference pattern, the image density of the image pattern formed on the film can be adjusted in advance. This corrects that the color becomes lighter due to elongation (decrease in density) and reproduces the correct color.

  According to this embodiment, a mockup (original model, model) created by designing a texture on the surface of a three-dimensional object by a designer or the like can be used as a model to mass-produce a replica (replica). The mockup is the second three-dimensional object RB, and the replica is a three-dimensional object RR that is mass-produced. That is, a large number of three-dimensional objects RR having the same texture as the second three-dimensional object RB can be manufactured.

  Here, the first three-dimensional object RA has the same shape characteristics as the mass-produced three-dimensional object RR, and data for generating an image pattern GP, that is, image conversion information (trans2D3D) and three-dimensional coordinate conversion information described later. Created to get (trans3D).

  The mold used to create the first three-dimensional object RA can be manufactured using the second three-dimensional object RB as a three-dimensional model, and CAD data for manufacturing the mold of the second three-dimensional object RB. It is also possible to manufacture based on

  By making the scale (size) of the first three-dimensional object RA the same as that of the three-dimensional object RR to be mass-produced, the shrinkage and shrinkage of the resin are equivalent, and the same mold can be used. Since the conditions can be matched with each other, the accuracy of the image pattern GP can be improved.

  Further, the mock-up and the replica may have the same scale (size) or different scales. That is, for example, a mockup may be created as a model smaller than a mass-produced product.

  That is, in this embodiment, as shown in FIGS. 1, 2, and 8 to 14, the method for creating the image pattern GP to be applied to the surface of the three-dimensional object RR has the same shape characteristics and the same as the three-dimensional object RR. Applying a reference pattern PK to a first three-dimensional object RA having the same scale, obtaining three-dimensional information DRA and texture information TRA about the first three-dimensional object RA to which the reference pattern PK is applied, Obtaining the three-dimensional information DRB and the texture information TRB for the second three-dimensional object RB having the same shape characteristics as the three-dimensional object RA and having the texture drawn on the surface, the reference pattern PK and the first three-dimensional object RA Acquiring image conversion information (trans2D3D) for converting corresponding points between the texture information TRA and the first information Obtaining three-dimensional coordinate conversion information (trans3D) for converting between the three-dimensional information DRA about the object RA and the three-dimensional information DRB about the second three-dimensional object RB; and image conversion information (trans2D3D) The texture information TRB for the second three-dimensional object RB is projected onto the plane HM having the same two-dimensional coordinate system as that of the reference pattern PK using the three-dimensional coordinate conversion information (trans3D) and the image pattern GP is generated. Steps.

  The first three-dimensional object RA and the second three-dimensional object RB may have different scales. In that case, for example, the three-dimensional coordinate conversion information (trans3D) is acquired based on at least three points designated as corresponding points for the first three-dimensional object RA and the second three-dimensional object RB, and the first Based on the distance between at least three points designated for the three-dimensional object RA and the distance between at least three points designated for the second three-dimensional object RB. Information for converting the difference in scale with the three-dimensional object RB can be included in the three-dimensional coordinate conversion information (trans3D).

  Further, the method includes a step of acquiring an elongation amount of each part when the reference pattern PK is applied to the first three-dimensional object RA based on the reference pattern PK and the texture information TRA about the first three-dimensional object RA. For the image pattern GP obtained by projecting the texture information TRB for the second three-dimensional object RB, the density may be increased according to the amount of elongation.

  An apparatus for creating an image pattern for application to the surface of a three-dimensional object has the same shape characteristics as the first three-dimensional object and the first three-dimensional object having the same shape characteristics as the three-dimensional object and the reference pattern applied to the surface. Between the reference device and the texture information about the first three-dimensional object, and the measuring device (three-dimensional measuring machine 13) for acquiring the three-dimensional information and the texture information about the second three-dimensional object with the texture drawn on the surface. Between image conversion means (image conversion unit 33) for acquiring image conversion information for converting corresponding points of the three-dimensional information, and three-dimensional information about the first three-dimensional object and three-dimensional information about the second three-dimensional object The texture of the second three-dimensional object using the three-dimensional coordinate conversion means (three-dimensional coordinate conversion unit 36) for acquiring the three-dimensional coordinate conversion information for performing the conversion, the image conversion information and the three-dimensional coordinate conversion information information Has been projected onto a plane having the same two-dimensional coordinate system with the reference pattern and the pattern generating means for generating an image pattern (pattern generation unit 37), the.

  Further, based on the reference pattern and the texture information about the first three-dimensional object, an elongation amount acquisition unit (elongation amount acquisition unit 34) acquires the elongation amount of each part when the reference pattern is applied to the first three-dimensional object. And a density adjusting means (density adjusting unit 35) that increases the density according to the amount of elongation of the image pattern obtained by projecting the texture information about the second three-dimensional object. .

  In the present embodiment, “application” to the surface of the three-dimensional object R such as the image pattern GP or the reference pattern PK is shown by an example of “transfer” at the time of in-mold molding, but by other methods. Also good. For example, “printing” or “projecting” on the surface of the molded three-dimensional object R may be performed.

  FIG. 1 shows a schematic configuration of an image pattern creating apparatus 1 of the present embodiment.

  In FIG. 1, an image pattern creating apparatus 1 includes a processing unit 10, a display unit 11, an input unit 12 such as a keyboard 12a and a mouse 12b, a three-dimensional measuring machine 13, and the like.

  The processing unit 10 includes a CPU, ROM, RAM, other peripheral circuit elements, various hardware circuits, and the like. Various computer programs are stored in the ROM or RAM and executed by the CPU. In the present embodiment, the function of the image pattern creation device 1 is realized by the CPU executing a computer program for this purpose. Such a computer program can be downloaded via the Internet NWT, and can also be installed from a recording medium (not shown) using a device driving apparatus.

  The processing unit 10 controls the three-dimensional measuring machine 13, outputs a measurement operation command by the three-dimensional measuring machine 13, stores the three-dimensional information DR and the texture information TR output from the three-dimensional measuring machine 13, and Various calculations and corrections are performed on them.

  Although not shown in the figure, the processing unit 10 is provided with an interface for outputting the created image pattern GP, for example, a LAN, a flexible disk drive, a CD drive, a USB, and the like.

  The display unit 11 is a liquid crystal display (LCD) or the like, and displays input data input from the input unit 12, measurement results measured by the three-dimensional measuring machine 13, various processing results processed by the processing unit 10, and the like. Is done.

  The input unit 12 is used for the user to input various data and commands. For example, the corresponding point between the reference pattern and the texture information about the first three-dimensional object and the corresponding point for the first three-dimensional object and the second three-dimensional object are used by the user to instruct and input. .

  The three-dimensional measuring machine 13 can measure the surface shape and texture of a target object (three-dimensional object) R in a non-contact manner. By measuring the three-dimensional object R with the three-dimensional measuring machine 13, three-dimensional information DR indicating the three-dimensional shape of the three-dimensional object R and texture information TR indicating the state of the surface texture are acquired.

  The three-dimensional information DR is information indicating the three-dimensional coordinates of each point on the surface of the three-dimensional object R. The texture information TR is two-dimensional information indicating the texture of the surface of the three-dimensional object R, and includes color information and density information. Note that the texture information TR can exist as color information about, for example, a polygon that is the three-dimensional information DR or a plurality of polygons obtained from the three-dimensional information DR.

  The relationship between the three-dimensional information DR and the texture information TR will be described in detail later with reference to FIG.

  In the three-dimensional measuring machine 13, it is not always necessary to measure the three-dimensional information DR and the texture information TR at the same time, and they may be measured at different timings. Alternatively, the three-dimensional information DR and the texture information TR may be measured using separate measuring machines, and the obtained data may be combined later.

  Such a three-dimensional measuring machine 13 may scan the surface of a three-dimensional object by, for example, a light cutting method and obtain the three-dimensional coordinates of each point by the principle of triangulation. The format can be used. It is also possible to use a contact type three-dimensional measuring machine instead of a non-contact type.

  In FIG. 1, as the three-dimensional object R, a first three-dimensional object RA having a reference pattern transferred on the surface and a second three-dimensional object RB having a texture drawn on the surface are shown. By measuring these with the three-dimensional measuring machine 13, the three-dimensional information DRA and the texture information TRA for the first three-dimensional object RA, and the three-dimensional information DRB and the texture information TRB for the second three-dimensional object RB, respectively. To be acquired.

  The three-dimensional information DRA and the texture information TRA for the first three-dimensional object RA are “Data-A”, the three-dimensional information DRB and the texture information TRB for the second three-dimensional object RB are “Data-B”, respectively. May be described. In Data-A, 3D information DRA and texture information TRA are associated with each other, and in Data-B, 3D information DRB and texture information TRB are associated with each other.

  FIG. 2 shows an example of the configuration of functions implemented in the processing unit 10.

  In FIG. 2, the processing unit 10 includes a reference pattern storage unit 31, a measurement data storage unit 32, an image conversion unit 33, an elongation amount acquisition unit 34, a density adjustment unit 35, a three-dimensional coordinate conversion unit 36, a pattern generation unit 37, And an output unit 38 and the like.

  The reference pattern storage unit 31 stores one or a plurality of reference patterns PK created or prepared in advance. The reference pattern PK is for associating a point on the surface of the three-dimensional object R with a point on the film. As the reference pattern PK, for example, a pattern in which elements for specifying corresponding points are evenly arranged on a two-dimensional plane, such as a lattice pattern in which cells are arranged vertically and horizontally, or a dot pattern in which dots are arranged in a matrix Can be suitably used. The reference pattern PK may be created in the processing unit 10 or may be input from the outside.

  The reference pattern PK also includes information for specifying the coordinate position (two-dimensional coordinate position) of each point in the reference pattern PK, for example, a cell or a dot, which is recognized by the processing unit 10. Is possible. Further, the scale (magnification) of the reference pattern PK can be changed in the processing unit 10 and used.

  One of the reference patterns PK stored in the reference pattern storage unit 31 is selected, and an image of the selected reference pattern PK is formed on the transfer film. Further, a two-dimensional plane HM having a coordinate system having the same scale as that of the reference pattern PK is used for projecting the image pattern GP.

  The measurement data storage unit 32 stores the three-dimensional information DR and the texture information TR output from the three-dimensional measuring machine 13. It is possible to store a plurality of such data.

  The image conversion unit 33 acquires image conversion information (trans2D3D) for converting corresponding points between the reference pattern PK and the texture information TRA for the first three-dimensional object RA.

  That is, the image conversion unit 33 obtains the same portion of the reference pattern PK and the texture information TRA, and outputs image conversion information (trans2D3D) that is data indicating the correspondence between them.

  Note that the method for specifying the corresponding points between the reference pattern PK and the texture information TR is manually specified and input by the user using the mouse 12b, for example. It is also possible to use known techniques such as SAD, SSD, and POC.

  The elongation amount acquisition unit 34 acquires the elongation amount NR of each part when the reference pattern PK is applied to the first three-dimensional object RA based on the reference pattern PK and the texture information TRA.

  The density adjusting unit 35 controls the image pattern obtained by projecting the texture information TRB for the second three-dimensional object RB to perform a process of increasing the density according to the elongation amount NR.

  The three-dimensional coordinate conversion unit 36 performs three-dimensional coordinate conversion information (trans3D) for performing conversion between the three-dimensional information DRA about the first three-dimensional object RA and the three-dimensional information DRB about the second three-dimensional object RB. To get.

  That is, the three-dimensional coordinate conversion unit 36 uses the respective three-dimensional shape features for the three-dimensional information DRA and the three-dimensional information DRB, and converts each other's position coordinate information so that the same shape portion overlaps. 3D coordinate conversion information (trans3D), which is data to be used, is output.

  Since the first three-dimensional object RA and the second three-dimensional object RB have the same shape characteristics, basically, three-dimensional coordinate conversion information (trans3D) is obtained by designating three corresponding points. The three-dimensional coordinate conversion information (trans3D) can be represented, for example, as a 4 × 4 matrix operation expression.

  In addition, about the designation | designated method of the corresponding point of 3D information DRA and 3D information DRB, a user designates and inputs manually, for example. Also, known techniques such as click registration, marker registration, and IPC (Iterative Closest Point) can be used. If the coordinate system is determined by an object, a datum or the like can also be used.

  The pattern generation unit 37 uses the image conversion information (trans2D3D) and the three-dimensional coordinate conversion information (trans3D) to convert the texture information TRB for the second three-dimensional object RB into a plane having the same two-dimensional coordinate system as that of the reference pattern PK. The image pattern GP is generated by projecting the image onto the top.

  That is, the pattern generation unit 37 uses the image conversion information (trans2D3D) and the three-dimensional coordinate conversion information (trans3D), and the three-dimensional information DRB and the texture of the second three-dimensional object RB measured by the three-dimensional measuring machine 13. For the information TRB, a design design (texture GXB) at the same position as each point on the first three-dimensional object RA on which the reference pattern PK is formed is specified, and the specified design design is the same as the reference pattern PK Project onto the plane of placement. As a result, a corrected image pattern GP is generated.

  Note that, as described above, density adjustment is performed when or after the design design is projected. The density adjustment will be described in detail later. A method for generating the image pattern GP will be described later in detail.

  Next, in-mold molding applied in the present embodiment will be described. Note that the present invention can also be applied to film molding or film insert molding.

  FIG. 3 shows a flow of in-mold molding by a flowchart, and FIG. 4 shows a state of a mold in in-mold molding.

  3 and 4, first, the molds 21a and 21b are opened, and the position of the design design to which the film (roll film) 22 is fed and transferred is aligned [# 101 in FIG. 3, FIG. 4 (A)]. .

  Next, simultaneously with closing the molds 21a and 21b, the film 22 is fixed [# 102 in FIG. 3, FIG. 4 (B)].

  In this state, molten resin YJ is injected from the injection hole 21c of the mold 21b [# 103 in FIG. 3, FIG. 4 (C)]. The injected resin YJ flows into the gaps in the molds 21a and 21b and is molded into the designed shape. At the same time, the design design (image pattern GPX) on the surface of the film 22 is separated from the film 22 by the heat and pressure of the resin YJ that has flowed in and transferred to the surface of the molded resin YJ.

  Finally, the molds 21a and 21b are opened, and the molded resin YJ is taken out [# 104 in FIG. 3, FIG. 4 (D)].

  Next, how the pattern transferred at the time of in-mold molding is deformed on the resin surface will be described.

  FIG. 5 shows an example of an image pattern GPX formed on a film, and FIG. 6 shows two types of molds having different shapes and molded products (three-dimensional objects).

  In FIG. 5, an image pattern GPX to be transferred is formed on the film 22. The image pattern GPX is composed of a plurality of parallel straight lines.

  The mold 21A shown in FIG. 6A has a smooth surface shape in the mold and a constant curvature. The mold 21B shown in FIG. 6B has a corner portion where the surface shape in the mold suddenly changes, and the curvature greatly changes.

  When in-mold molding is performed using the image pattern GPX illustrated in FIG. 5 and the mold 21A illustrated in FIG. 6A, a molded product RXA illustrated in FIG. 6C is obtained. When in-mold molding is performed using the image pattern GPX illustrated in FIG. 5 and the mold 21B illustrated in FIG. 6B, a molded product RXB illustrated in FIG. 6D is obtained.

  That is, when the molten resin is injected into the molds 21A and 21B, the film 22 is pressed against the surface of the mold. When the curvature of the surface in the mold is constant as in the mold 21A shown in FIG. 6A, heat and pressure are uniformly applied to the entire film 22, so that no uneven elongation occurs in the film 22. . As a result, the image pattern GPX is transferred without being deformed, and the texture GXJA is formed.

  On the other hand, when there is a complicated change in curvature on the surface in the mold as in the mold 21B shown in FIG. 6B, heat and pressure are reduced when the injected resin is filled. It will be added uniformly. Therefore, the film 22 is partially expanded, and the image pattern GPX is also transferred in a deformed state. As a result, as shown in FIG. 6D, the line of the image pattern GPX extends and becomes thin, and a texture GXJB having unevenness in the line thickness is formed.

  Therefore, if the portion where the image pattern GP is deformed at the time of in-mold molding is known, the target texture can be formed by deforming the image pattern GP formed on the film 22 in reverse. .

  FIG. 7A shows the target texture GXC1. When performing in-mold molding using the mold 21B shown in FIG. 6 (B), the corners of the mold extend and the lines become thin. Therefore, as shown in FIG. The image pattern GPXC1 having a larger line width may be used.

  Since the example of FIG. 7 has a very simple shape, the image pattern GP can be corrected relatively easily. However, since the shape change is complicated in the case of an actual molded product, the position to be corrected It is difficult to adjust the amount. Therefore, in order to obtain an accurately corrected image pattern GP, it has conventionally been necessary to repeatedly correct and prototype the image pattern GP many times.

  Next, a method for creating the image pattern GP in the present embodiment will be described in detail.

  FIG. 8 is a flowchart showing the flow of an image pattern creation method according to the present embodiment, and FIGS. 9 and 10 schematically show the flow of the image pattern creation method.

  8 to 10, first, a reference pattern PK is prepared [# 111 in FIG. 8, FIG. 9A]. Here, a lattice pattern PKK is used as the reference pattern PK. The reference pattern PK is formed as an image pattern GPXK on the film 22 [# 112 in FIG. 8, FIG. 9B].

  In-mold molding is performed using the film 22 on which the image pattern GPXK is formed. The resin-molded first three-dimensional object RA has a texture GXK added to its surface by transferring the image pattern GPXK of the film 22 [# 113 in FIG. 8, FIG. 9 (C)].

  The three-dimensional measuring device 13 measures the first three-dimensional object RA, and acquires three-dimensional information DRA and texture information TRA about the first three-dimensional object RA [# 114 in FIG. 8, FIG. 9 (D)].

  In addition, in order to obtain the texture information TRA and the three-dimensional information DRA, measurement is performed a plurality of times so that data about the entire circumference of the first three-dimensional object RA is obtained. By integrating the measurement data obtained by measuring from different directions, the texture information TR and the three-dimensional information DR of the entire surface of the first three-dimensional object RA are acquired.

  In addition, about the texture information TRA, when the texture GXK is added to only a part of the surface of the first three-dimensional object RA, only the part may be measured.

  On the other hand, a second three-dimensional object RB serving as a mass production model is created (# 115 in FIG. 8). A texture GXB is formed on the surface of the second three-dimensional object RB.

  The second three-dimensional object RB is measured using the three-dimensional measuring device 13 as in the case of the first three-dimensional object RA, and three-dimensional information DRB and texture information TRB are acquired [# 116 in FIG. 8, FIG. (E)].

  Obtain three-dimensional coordinate conversion information (trans3D) for performing conversion between the three-dimensional information DRA about the first three-dimensional object RA and the three-dimensional information DRB about the second three-dimensional object RB [# in FIG. 117, FIG. 10 (F)].

  In addition, for example, at the same time as matching the positions based on the three points designated as the corresponding points of the three-dimensional information DRA and the three-dimensional information DRB, at the same time, the shape inspection to detect the portions where the shapes do not match It is also possible to do this. In that case, if the two shapes are significantly different, a message such as a warning may be displayed so that the user can determine whether or not to suspend the subsequent processing.

  Further, when the scales of the first three-dimensional object RA and the second three-dimensional object RB are different, for example, the three-dimensional information DRA or the three-dimensional information DRB is enlarged or reduced by a scale corresponding to the same size. You may make it designate a corresponding point after making it.

  Image conversion information (trans2D3D) for converting corresponding points between the reference pattern PK and the texture information TRA for the first three-dimensional object RA is acquired [# 118 in FIG. 8, FIG. 10 (G)]. Note that, when acquiring the image conversion information (trans2D3D), not only the texture information TRA but also the three-dimensional information DRA is used.

  Then, using the image conversion information (trans2D3D) and the three-dimensional coordinate conversion information (trans3D), the texture information TRB for the second three-dimensional object RB is projected onto the plane HM having the same two-dimensional coordinate system as the reference pattern PK. As a result, an image pattern GP is generated [# 119 in FIG. 8, FIG. 10 (H)].

  That is, when the texture information TRB is projected onto the plane HM, the projection position is converted by the image conversion information (trans2D3D) and the three-dimensional coordinate conversion information (trans3D), and thereby the image pattern corrected corresponding to the texture GXB. GP is obtained.

  FIG. 10G shows a state in which the first three-dimensional object RA is viewed from above so that the entire texture GXK is displayed. However, when the entire texture GXK is not displayed at the same time, the necessary texture GXK may be displayed by rotating the first three-dimensional object RA, that is, the three-dimensional information DRA.

  That is, when the shape of the first three-dimensional object RA is complicated, the texture GXK may not be seen as a shadow only from one direction. In Data-B, since the three-dimensional information DRA and the texture GXKA of the same part are associated with each other, the posture of the three-dimensional information DR may be changed so that the part of the texture GXK that needs to be displayed is in front.

  Next, an example of a method for creating image conversion information (trans2D3D) will be described. Here, a case where the user manually associates will be described.

  Here, only the intersection (grid point) of the lattice pattern PKK is used as the corresponding point. Corresponding to the lattice points (p11, p12, p13,...) Of the reference pattern PK shown in FIG. 11, the user visually observes the lattice points of the texture GXK of the first three-dimensional object RA shown in FIG. Instruct. Thereby, the processing unit 10 sequentially obtains the three-dimensional coordinates (P11, P12, P13,.

  At this time, when the first three-dimensional object RA is displayed as viewed from the side as shown in FIG. 12A, for example, the lattice points P32 and P33 are hidden behind and cannot be seen. In this case, the first three-dimensional object RA is rotated and displayed as viewed from above as shown in FIG. 12B, so that the hidden lattice points P32 and P33 can be seen.

  Since Data-A holds the three-dimensional information DRA and the texture information TRA in association with each other, the three-dimensional coordinates of the corresponding part can be obtained by designating the lattice points of the surface texture GXK.

  By repeating this operation, a correspondence table TT as shown in FIG. 13 is generated.

  In FIG. 13, the correspondence table TT shows the correspondence between the point p on the reference pattern PK and the point P in the three-dimensional information DR of the first three-dimensional object RA. The correspondence table TT is an example of image conversion information (trans2D3D).

  Note that the texture GXK also exists between the lattice points of the reference pattern PK, but these points can be obtained by an interpolation method such as bilinear interpolation or cubic convolution.

  Next, an example of processing for generating the image pattern GP in the pattern generation unit 37 will be described in detail.

  In FIG. 14, a three-dimensional position, which is a transfer position to the surface on Data-A of the first three-dimensional object RA, for one point designated on the reference pattern PK is obtained using image conversion information (trans2D3D). (# 201).

  The three-dimensional position on Data-B of the second three-dimensional object RB corresponding to the three-dimensional position on Data-A obtained in Step # 201 is obtained using the three-dimensional coordinate conversion information (trans3D) (# 202 ).

  The texture information TRB at the three-dimensional position on Data-B obtained at step # 202 is projected onto the plane HM having the same two-dimensional coordinate system as the reference pattern PK (# 203).

  An image pattern GP to be formed on the film 22 is generated by repeating these steps # 201 to 203 with a resolution fine enough to form an image on the film 22.

  In this way, the image conversion information (trans2D3D) and the three-dimensional coordinate conversion information (trans3D) are acquired using the first three-dimensional object RA to which the reference pattern PK is transferred and the actually created second three-dimensional object RB. Since the image pattern GP is formed using the image conversion information (trans2D3D) and the three-dimensional coordinate conversion information (trans3D), an accurate image pattern GP can be created.

  In particular, since the first three-dimensional object RA actually transferred with the reference pattern PK and the second three-dimensional object RB actually created as a model are used, the actual three-dimensional object (second The same exact texture (texture GXB) can be obtained by transferring the texture GXB drawn on the surface of the three-dimensional object RB) to the three-dimensional object (three-dimensional object RR) having the same shape characteristics.

  Further, since the image pattern GP is corrected including the effects of expansion of the mold and the like due to heat, shrinkage and shrinkage of the resin, an accurate replica of the second three-dimensional object RB is obtained by using the image pattern GP. (Three-dimensional object RR) can be mass-produced.

  Next, the density adjustment process in the density adjustment unit 35 will be described in detail.

  As shown in FIGS. 6B and 6D, the density of the texture GX changes at the corners of the mold.

  That is, when in-mold molding is performed using the image pattern GPX2 shown in FIG. 15A, a molded product RXC shown in FIG. 15B is obtained. Also in this case, if there is a portion with a sharp curvature change on the surface of the mold, the film 22 is locally stretched by heat and pressure during resin injection, and the image pattern GPX2 applied to that portion is also stretched.

  Then, when the image pattern GPX2 having a certain area is transferred as shown in FIG. 15A, the density of the stretched portion of the image pattern GPX2 becomes light.

  When performing in-mold molding, if the part of the image pattern GP to be deformed is known in advance, the image pattern GP formed on the film 22 may be deformed in the opposite direction in advance.

  Therefore, for example, in order to obtain the texture GXD1 having the uniform density (color) shown in FIG. 16A in the three-dimensional object RR shown in FIG. 15B, the density of the extending portion as shown in FIG. An image pattern GPXD1 with a high height may be used.

  In that case, it is possible to predict from what the known image pattern is deformed how much the density of which part should be changed.

  For example, when the lattice pattern GPK2 shown in FIG. 17A is used as a known image pattern, a molded product RXD2 shown in FIG. 17B, for example, is obtained by in-mold molding.

  In the lattice pattern GPK2, the distances between the lattices are all L, but in the texture GXD2 of the molded product RXD2, the lateral distance between the lattices is partially increased and changed to L1. That is, the film 22 extends at a portion where the curvature of the molded product RXD2 is increased, and the distance L1 of the portion satisfies L1> L.

  If it does so, the area S of the part which the film 22 extended becomes larger than another part, and a color becomes light so much.

  FIG. 18 schematically shows the state of color fading due to the elongation of the film 22.

  In the film 22 shown in FIG. 18A, a predetermined amount of the coating component TS is uniformly adhered within the range of the distance L between the lattices. In the texture GXD2 of the molded product RXD2 that has been in-mold molded using the film 22, as shown in FIG. 18B, the same amount as the film 22 within the range in which the film 22 is stretched and the distance is L1. The coating component TS spreads and adheres. Therefore, the density of the portion of the texture GXD2 is lowered and the color is lightened.

  As described above, when the interval between the coating components TS on the film 22 is expanded by transfer, the color becomes light. Accordingly, an amount of the coating component TS sufficient to realize the color density desired to be expressed on the molded product RXD2 in accordance with the expansion and contraction of the film 22 due to the transfer may be applied on the film 22 in advance.

  In the examples shown in FIGS. 17 and 18, only the extension in the horizontal direction is shown, but the extension in the vertical direction may be considered.

  Therefore, if the area of the stretched portion is S1, and the area of the non-stretched portion is S, the stretched portion has an area (S1 / S) times.

Therefore, with respect to the image pattern GP formed on the film 22, the density of the stretched part is less than the density of the stretched part.
α = a (S1 / S)
It is only necessary to darken the magnification indicated by. Here, a is a coefficient.

  The distance L1 between the lattices in the texture GXD2 of the molded product RXD2 can be measured by the three-dimensional measuring machine 13. For example, what is necessary is just to obtain | require the length of the curve on the three-dimensional space along the surface of the molded article RXD2.

  Further, in the examples shown in FIGS. 17 and 18, the lattice interval L of the lattice pattern GPK2 is shown to be excessively large with respect to the curved portion of the surface of the molded product RXD2, but by appropriately reducing the lattice interval L The elongation of the film 22 can be detected at fine intervals.

  Next, the relationship between the three-dimensional information DR and the texture information TR will be described.

  19B and 19C, the surface of the first three-dimensional object RA is formed in the vicinity of the lattice point P42 of the texture GXK based on the lattice pattern for the first three-dimensional object RA shown in FIG. 19A. A polygon PG is shown.

  As shown in FIGS. 19B and 19C, the surface of the first three-dimensional object RA is constituted by a set of polygons PG defined by three points Q1, Q2, and Q3, respectively. Each point Q1, Q2, Q3 has a three-dimensional coordinate (X, Y, Z) acquired by the three-dimensional measuring machine 13, respectively.

  Each point Q1, Q2, Q3 has color information (R, G, B) acquired by the three-dimensional measuring machine 13, respectively. As the color information (R, G, B) of one point Q, for example, the color information of one or a plurality of polygons PG including the point Q or the average value thereof can be used.

  Accordingly, in this example, a set of three-dimensional coordinates (X, Y, Z) of each point Q constituting each polygon PG can be used as the three-dimensional information DRA, and the color information (R, G, The set of B) can be texture information TRA.

  In addition, a set of three-dimensional coordinates of each polygon PG or a plurality of polygons PG can be used as three-dimensional information DRA, and a set of color information of each polygon PG or a plurality of polygons PG can be used as texture information TRA. . In this case, based on the three-dimensional coordinates (X, Y, Z) and color information (R, G, B) of the points constituting the polygon PG, the average thereof is used to determine the three-dimensional coordinates and color of the polygon PG. Information can be obtained by calculation.

  In the embodiment described above, the shapes and textures GXK and the like of the three-dimensional object RR, the first three-dimensional object RA, and the second three-dimensional object RB can be various other than those described above.

  Further, the contents, format, and the like of the three-dimensional information DR, texture information TR, three-dimensional coordinate conversion information (trans3D), and image conversion information (trans2D3D) can be various other than those described above.

  In addition, the film 22, the image conversion unit 33, the stretch amount acquisition unit 34, the density adjustment unit 35, the three-dimensional coordinate conversion unit 36, the pattern generation unit 37, the processing unit 10, the display unit 11, the input unit 12, and the three-dimensional measuring machine 13 Alternatively, the configuration, structure, circuit, processing content, processing order, shape, number, arrangement, and the like of each part or the whole of the image pattern creation device 1 can be appropriately changed in accordance with the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Image pattern production apparatus 10 Processing part 11 Display part 12 Input part 13 Three-dimensional measuring machine (measuring device)
22 Film 33 Image converter (image converter)
34 Elongation acquisition unit (Elongation acquisition means)
35 Density adjustment unit (Density adjustment means)
36 3D coordinate conversion unit (3D coordinate conversion means)
37 Pattern generator (pattern generator)
38 Output part R, RR Three-dimensional object RA First three-dimensional object RB Second three-dimensional object RX Molded product (three-dimensional object)
GP image pattern PK reference pattern PKK lattice pattern (reference pattern)
GX, GXK Texture TR Texture information DR 3D information trans2D3D Image conversion information trans3D 3D coordinate conversion information HM Planar NR Elongation amount

Claims (8)

A method of creating an image pattern to be applied to the surface of a three-dimensional object,
Applying a reference pattern to a first three-dimensional object having the same shape characteristics and scale as the three-dimensional object;
Obtaining three-dimensional information and texture information about the first three-dimensional object to which the reference pattern is applied;
Obtaining three-dimensional information and texture information about a second three-dimensional object having the same shape characteristics as the first three-dimensional object and having a texture drawn on the surface;
Obtaining image conversion information for converting corresponding points between the reference pattern and texture information about the first three-dimensional object;
Obtaining three-dimensional coordinate conversion information for performing conversion between three-dimensional information about the first three-dimensional object and three-dimensional information about the second three-dimensional object;
Projecting texture information about the second three-dimensional object on a plane having the same two-dimensional coordinate system as the reference pattern using the image conversion information and the three-dimensional coordinate conversion information to generate an image pattern When,
A method of creating an image pattern for application to the surface of a three-dimensional object characterized by comprising: The first three-dimensional object and the second three-dimensional object have different scales.
The method of creating an image pattern according to claim 1. Obtaining the three-dimensional coordinate transformation information based on at least three points respectively designated as corresponding points for the first three-dimensional object and the second three-dimensional object;
Based on the distance between at least three points designated for the first solid object and the distance between at least three points designated for the second solid object, the first solid object and the Information for converting the difference in scale with the second three-dimensional object is included in the three-dimensional coordinate conversion information.
The method of creating an image pattern according to claim 2. Based on the reference pattern and the texture information about the first three-dimensional object, obtaining an elongation amount of each part when the reference pattern is applied to the first three-dimensional object;
For the image pattern obtained by projecting the texture information about the second three-dimensional object, the density is increased according to the amount of elongation.
4. A method for creating an image pattern according to claim 1. An apparatus for creating an image pattern for application to the surface of a three-dimensional object,
A first three-dimensional object having the same shape characteristics as the three-dimensional object and having a reference pattern applied to the surface, and a second three-dimensional object having the same shape characteristics as the first three-dimensional object and having a texture drawn on the surface A measuring device for obtaining the three-dimensional information and texture information of
Image conversion means for acquiring image conversion information for converting corresponding points between the reference pattern and the texture information about the first three-dimensional object;
Three-dimensional coordinate conversion means for acquiring three-dimensional coordinate conversion information for performing conversion between the three-dimensional information about the first three-dimensional object and the three-dimensional information about the second three-dimensional object;
A pattern for generating an image pattern by projecting texture information about the second three-dimensional object onto a plane having the same two-dimensional coordinate system as the reference pattern, using the image conversion information and the three-dimensional coordinate conversion information. Generating means;
A device for creating an image pattern characterized by comprising: Based on the reference pattern and the texture information about the first three-dimensional object, an elongation amount acquisition unit that acquires an elongation amount of each part when the reference pattern is applied to the first three-dimensional object;
A density adjusting means for increasing the density according to the amount of elongation with respect to an image pattern obtained by projecting texture information about the second three-dimensional object;
The image pattern creating apparatus according to claim 5. A computer program executed in an apparatus for creating an image pattern for application to the surface of a three-dimensional object,
When executed in the creation device,
Obtain image conversion information for converting corresponding points between a reference pattern and texture information about a first three-dimensional object having the same shape characteristics as the three-dimensional object and having the reference pattern applied to the surface. Image conversion means;
Convert between the three-dimensional information about the first three-dimensional object and the three-dimensional information about the second three-dimensional object having the same shape characteristics as the first three-dimensional object and having a texture drawn on the surface. Three-dimensional coordinate conversion means for acquiring three-dimensional coordinate conversion information for
A pattern for generating an image pattern by projecting texture information about the second three-dimensional object onto a plane having the same two-dimensional coordinate system as the reference pattern, using the image conversion information and the three-dimensional coordinate conversion information. Generating means;
Is realized in the creating apparatus. When executed in the creation device,
Furthermore, based on the reference pattern and the texture information about the first three-dimensional object, an elongation amount acquisition unit that acquires an elongation amount of each part when the reference pattern is applied to the first three-dimensional object;
A density adjusting means for increasing the density according to the amount of elongation with respect to an image pattern obtained by projecting texture information about the second three-dimensional object;
The computer program according to claim 7, which is realized in the creation device.

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