JP4081033B2 - Watermark information embedding method, watermark information embedding device and medium, and three-dimensional shape model display method, three-dimensional shape model display device and medium - Google Patents

Description

  The present invention relates to a method, apparatus, and medium for embedding watermark information in a three-dimensional shape model, and a method, apparatus, and medium for extracting watermark information and displaying a three-dimensional shape model, and more particularly to parameters relating to display of a three-dimensional shape model. The present invention relates to embedding watermark information and displaying a three-dimensional shape model after extracting the watermark information from the display parameters.

  In recent years, since digital contents such as voice and images have become widespread, it has become possible to easily use tools that enable the distribution of these contents by electronic methods using the Internet or the like, and the copying and editing of these contents. . For this reason, a digital watermark technology has been devised to prevent unauthorized duplication, falsification, and theft and to protect the copyright of digital content, and copyright protection of digital content by this digital watermark technology has entered the practical stage.

  On the other hand, the use of three-dimensional shape models is spreading in various design fields including industrial products.

  Conventionally, three-dimensional shape data is mainly created by a system such as CAD, and has been limited to use among very specialized engineers such as a design department of a company. However, since the 3D shape data can be easily understood visually, the product is transmitted via the network with the development of network infrastructure and computer technology represented by the Internet, etc., or general consumers It came to be used for.

  The three-dimensional shape data has several characteristics. This is because the design departments of companies create 3D shape data, and the 3D shape data itself is often very sensitive information. Is costly.

  Furthermore, even if the copyright information is embedded in the 3D shape model as text in order to protect the copyright of the 3D shape data, it is not possible to prevent deletion or falsification of the text by a malicious third party.

  Therefore, as a method for directly embedding watermark information in three-dimensional shape data, an invention described in Japanese Patent Laid-Open No. 10-334272 is disclosed. The present invention embeds watermark information in the redundancy of geometric parameters defining a shape model. For example, watermark information is embedded by shifting the coordinate value of the vertex by a minute amount.

JP 10-334272 A

  However, the method of embedding watermark information in such three-dimensional shape data has the following problems. That is, the geometric parameters of the three-dimensional shape data created by CAD are extremely essential and important parameters, and often require precision after the decimal point. Therefore, changing the geometric parameters can lead to unintended results. For example, when the coordinate value is changed as a geometric parameter of a three-dimensional shape model in order to embed watermark information, it is possible that the intended calculation result cannot be obtained if the interference line is calculated. Alternatively, when the apparatus for displaying the three-dimensional shape data is changed, it is conceivable that the three-dimensional shape data that has been normally displayed until now is not displayed normally due to an error in an important geometric parameter.

  The present invention has been made in view of the above, and accurately displays three-dimensional shape data even if it is three-dimensional shape data in which watermark information is embedded, and embeds watermark information in a three-dimensional shape model. The purpose is to prevent unauthorized duplication, falsification or theft by unauthorized third parties.

In order to solve the above-described problems and achieve the object, the invention according to claim 1 relates to a geometric parameter that defines the shape of a three-dimensional shape model and a display mode of the three-dimensional shape model that is defined by the geometric parameter. A watermark information embedding method for embedding watermark information in the three-dimensional shape model information, wherein the embedding means sets a predetermined bit of the parameter relating to the display mode in the three-dimensional shape model information as watermark information. An embedding step for embedding watermark information in the three-dimensional shape model information by changing to numerical information obtained by the conversion is included .

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the parameter relating to the display mode defines an initial display state of the three-dimensional shape model.

The invention according to claim 3 is the invention according to claim 2, wherein the parameter relating to the display mode is viewpoint position coordinate information indicating a position coordinate of a viewpoint as information defining an initial display state of the three-dimensional shape model. , Gazing point position coordinate information indicating the position coordinates of the gazing point, display direction information that determines the display direction at the time of display, viewing angle information that defines the field of view from the viewpoint, distance information of the near clipping plane, distance of the far clipping plane Information, distance information between clipping planes, display magnification information indicating a display magnification, position coordinates of a light source, and light source color information of a light source are used .

The invention according to claim 4 is a method for extracting watermark information from a three-dimensional shape model , wherein the extracting means converts a predetermined bit value of a parameter relating to a display mode of the three-dimensional shape model into numerical information. extracting the watermark information being, characterized in that it comprises a.

The invention according to claim 5 is the invention according to claim 4, wherein the extraction step, the extraction means, the input attached three-dimensional shape model predetermined bit values of the parameters related to the display mode of the document From the above, watermark information converted into numerical information is extracted.

The invention according to claim 6 is the invention according to claim 4 or 5 , wherein the output processing means satisfies information included in the watermark information extracted by the extraction step satisfying a predetermined requirement. The image processing apparatus further includes a screen processing step for displaying a display editing screen for displaying or editing the three-dimensional shape model.

The invention according to claim 7 is the invention according to claim 6 , wherein the information collating means is associated in advance with the unique identification information included in the watermark information extracted by the extraction step and the unique identification information. the authentication step of performing authentication based on the authentication information to determine whether authorized to perform the screen processing, comprising further the screen processing step, the output processing means, performed by the authentication step A display editing screen for displaying or editing a three-dimensional shape model is displayed only when it is authenticated that screen processing is possible by authentication.

According to an eighth aspect of the present invention , the watermark is added to the three-dimensional shape model information having a geometric parameter defining the shape of the three-dimensional shape model and a parameter relating to a display mode of the three-dimensional shape model defined by the geometric parameter. A watermark information embedding device for embedding information , wherein a predetermined bit of a parameter relating to a display mode in the three-dimensional shape model is changed to numerical information obtained by converting the watermark information, whereby the watermark information is three-dimensionally An embedding means for embedding in the shape model information is provided.

The invention according to claim 9 is the invention according to claim 8 , wherein the parameter relating to the display mode defines an initial display state of the three-dimensional shape model.

The invention according to claim 10 is the invention according to claim 9 , wherein the parameter relating to the display mode is viewpoint position coordinate information indicating a position coordinate of the viewpoint as information defining an initial display state of the three-dimensional shape model. , Gazing point position coordinate information indicating the position coordinates of the gazing point, display direction information that determines the display direction at the time of display, viewing angle information that defines the field of view from the viewpoint, distance information of the near clipping plane, distance of the far clipping plane Information, distance information between clipping planes, display magnification information indicating a display magnification, position coordinates of a light source, and light source color information of a light source are used .

The invention according to an eleventh aspect is characterized by comprising an extracting means for extracting watermark information converted into numerical information from a predetermined bit value of a parameter relating to a display mode of the three-dimensional shape model.

According to a twelfth aspect of the present invention, in the invention according to the eleventh aspect , the extracting means converts the predetermined bit value of the parameter relating to the display mode of the three-dimensional shape model attached to the input document into numerical information. The converted watermark information is extracted.

The invention according to claim 13 is the invention according to claim 11 or 12 , wherein the information included in the watermark information extracted by the extracting means satisfies a predetermined requirement. An output processing means for displaying a display editing screen on which the model is displayed or edited is further provided.

The invention according to claim 14 is the invention according to claim 13 , wherein the unique identification information included in the watermark information extracted by the extraction means and screen processing associated with the unique identification information in advance are performed. An information collating unit that performs authentication based on authentication information for determining whether or not the user has authority is further provided, and the output processing unit is authenticated to perform screen processing by the authentication performed by the authenticating unit. The display editing screen for displaying or editing the three-dimensional shape model is displayed only in the case where the three-dimensional shape model is displayed.

The invention according to claim 15 is characterized in that a program is recorded for causing a computer to execute the watermark information embedding method according to any one of claims 1 to 3 .

According to a sixteenth aspect of the present invention, a program is recorded for causing a computer to execute the three-dimensional shape model display method according to any one of the fourth to seventh aspects.

A watermark information embedding method according to the present invention (Claim 1) embeds watermark information by converting predetermined bits of a parameter relating to a display mode of a three-dimensional shape model included in the three-dimensional shape model information. Thus, there is an effect that it is possible to hold an accurate shape model of the three-dimensional shape model and to prevent unauthorized duplication, falsification or theft by an unauthorized third party by watermark information.

Further, the watermark information embedding method according to the present invention (Claim 2) converts a predetermined bit of the three-dimensional shape model defining the initial display state as a parameter relating to the display mode, and converts the watermark into a watermark. By embedding information, there is an effect that an accurate shape model of the three-dimensional shape model can be held, and unauthorized duplication, falsification, or theft by an unauthorized third party can be prevented by watermark information.

Further, the watermark information embedding method according to the present invention (Claim 3) is used as information defining the initial display state of the three-dimensional shape model . Gaze point position coordinate information that indicates position coordinates, display direction information that determines the display direction during display, viewing angle information that defines the field of view from the viewpoint, near clipping plane distance information, far clipping plane distance information, clipping plane By converting predetermined bits of any of the distance information, display magnification information indicating display magnification, light source position coordinates, and light source color information of the light source, and embedding watermark information, the three-dimensional shape model It is said that it is possible to maintain an accurate shape model and to prevent unauthorized duplication, falsification or theft by unauthorized third parties by watermark information. An effect.

Further, the 3D shape model display method according to the present invention (claim 4 ) extracts watermark information converted into numerical information from a predetermined bit value of a parameter relating to the display mode of the 3D shape model. The accurate model shape of the three-dimensional shape model can be accurately displayed, and the watermark information can prevent unauthorized duplication, falsification or theft by an unauthorized third party.

In the three-dimensional shape model display method according to the present invention (claim 5 ), a predetermined bit value of a parameter relating to a display mode of the three-dimensional shape model attached to the input document is converted into numerical information. Since the watermark information is extracted, it is possible to accurately display the accurate model shape of the three-dimensional shape model, and the watermark information can prevent unauthorized duplication, falsification, or theft by an unauthorized third party. Play.

  Further, according to the three-dimensional shape model display method of the present invention (claim 13), a display in which a three-dimensional shape model is displayed or edited when information included in the watermark information satisfies a predetermined requirement. Since the edit screen is displayed, the document or the three-dimensional shape model can be protected from unauthorized use.

  In the three-dimensional shape model display method according to the present invention (Claim 14), authentication is performed based on the unique identification information included in the watermark information and the authentication information previously associated with the unique identification information. There is an effect that it is possible to protect the document or the three-dimensional shape model from various uses.

The watermark information embedding device according to the present invention (Claim 8 ) converts a predetermined bit of a parameter relating to a display mode of the three-dimensional shape model included in the three-dimensional shape model information, and converts the watermark information into By embedding, there is an effect that an accurate shape model of the three-dimensional shape model is held, and unauthorized duplication, falsification, or theft by an unauthorized third party can be prevented by watermark information.

The watermark information embedding device according to the present invention (Claim 9 ) converts a predetermined bit of the three-dimensional shape model defining the initial display state as a parameter relating to the display mode, and converts the watermark into a watermark. By embedding information, there is an effect that an accurate shape model of the three-dimensional shape model can be held, and unauthorized duplication, falsification, or theft by an unauthorized third party can be prevented by watermark information.

In addition, the watermark information embedding device according to the present invention (claim 10 ) uses viewpoint position coordinate information indicating the position coordinates of the viewpoint, which is used as information defining the initial display state of the three-dimensional shape model , Gaze point position coordinate information that indicates position coordinates, display direction information that determines the display direction during display, viewing angle information that defines the field of view from the viewpoint, near clipping plane distance information, far clipping plane distance information, clipping plane By converting predetermined bits of any of the distance information, display magnification information indicating display magnification, light source position coordinates, and light source color information of the light source, and embedding watermark information, the three-dimensional shape model When it is possible to maintain an accurate shape model and to prevent unauthorized duplication, tampering or theft by unauthorized third parties with watermark information There is an effect.

Further, the three-dimensional shape model display apparatus according to the present invention (claim 11 ) extracts watermark information converted into numerical information from a predetermined bit value of a parameter relating to the display mode of the three-dimensional shape model. The accurate model shape of the three-dimensional shape model can be accurately displayed, and the watermark information can prevent unauthorized duplication, falsification or theft by an unauthorized third party.

In the three-dimensional shape model display device according to the present invention (claim 12 ), a predetermined bit value of a parameter relating to a display mode of the three-dimensional shape model attached to the input document is converted into numerical information. Because watermark information is extracted, it is possible to accurately display the accurate model shape of the 3D shape model, and it is possible to prevent unauthorized duplication, falsification or theft by unauthorized third parties due to the watermark information. There is an effect.

Further, the three-dimensional shape model display apparatus according to the present invention (claim 13 ) displays the three-dimensional shape model when the information included in the watermark information satisfies a predetermined requirement. Since the edit screen is displayed, the document or the three-dimensional shape model can be protected from unauthorized use.

The three-dimensional shape model display device according to the present invention (Claim 14 ) authenticates based on the unique identification information included in the watermark information and the authentication information previously associated with the unique identification information. There is an effect that it is possible to protect the document or the three-dimensional shape model from various uses.

The recording medium according to the present invention (Claim 15 ) is the watermark information described in any one of Claims 1 to 3 by causing a computer to read and execute a program recorded on the recording medium. The embedding method can be realized by using a computer, and the same effects as those of the watermark information embedding methods can be obtained.

A recording medium according to the present invention (Claim 16 ) is a three-dimensional recording medium according to any one of Claims 4 to 7 , by causing a computer to read and execute a program recorded on the recording medium. The shape model display method can be realized by using a computer, and the same effects as those of the three-dimensional shape model display methods can be obtained.

  With reference to the accompanying drawings, a watermark information embedding method, a watermark information embedding device, a three-dimensional shape model display method embedded in a three-dimensional shape model, and a three-dimensional shape according to the present invention will be described below. The best mode of the model display device will be described in detail.

(First embodiment)
A watermark information embedding method, a watermark information embedding device, a three-dimensional shape model display method embedded in a three-dimensional shape model, and a watermark information embedding device according to the first embodiment The embedding device embeds watermark information using parameters related to the initial display of the three-dimensional model, and the three-dimensional shape model display device extracts the watermark information when displaying the three-dimensional shape model, and the watermark information Is also displayed. The parameter relating to the initial display is a parameter that defines how the 3D shape model is displayed when the viewer opens an electronic document including the 3D shape model.

  FIG. 1 is a block diagram showing the configuration of the watermark information embedding device according to the first embodiment of the present invention. As shown in FIG. 1, a watermark information embedding device 100 according to the present embodiment includes a data input processing unit 101, an output processing unit 102, a three-dimensional model acquisition unit 103, a watermark information embedding unit 104, and input control. Section 105 and a watermark information conversion processing section 106.

  The data input processing unit 101 performs input processing of 3D shape model data for the watermark information embedding device 100 to embed watermark information or an electronic document including the 3D shape model, and the input processed 3D shape model or electronic Information about the document is output to the output processing unit 102.

  The three-dimensional model acquisition unit 103 acquires only information related to the three-dimensional shape model from the three-dimensional shape model or the electronic document input from the data input processing unit 101. The acquired information of the three-dimensional shape model includes parameters relating to the initial display.

  The input control unit 105 controls information input by a user using an input device, outputs watermark information input by the user to the watermark information conversion processing unit 106, or an electronic document generated or updated by the user Is output to the output processing unit 102. Further, the user can set the initial display state of the three-dimensional shape model of the electronic document by setting parameters such as a viewpoint and a gazing point via the input control unit 105. However, in order to prevent missing of the watermark information, it is assumed that the lower bits, which are the embedding destination of the watermark information, cannot be changed.

  The watermark information conversion processing unit 106 converts the watermark information input from the input control unit 105 into numerical information for embedding in the three-dimensional shape model, and outputs the numerical information to the watermark information embedding unit 104. In the conversion method to numerical values in the present embodiment, a character string input by a user using an input device is converted into numerical information using an ASCII code.

The watermark information embedding unit 104 implements the embedding step in the present invention, and inputs from the watermark information conversion processing unit 106 the lower bits of the parameters related to the initial display of the three-dimensional shape model input from the three-dimensional model acquisition unit 103. By updating with the numerical information, the watermark information is embedded in the three-dimensional shape model, and the three-dimensional shape model in which the watermark information is embedded is output to the output processing unit 102. Since the parameter in which the watermark information is embedded is set as a parameter related to the initial display, the three-dimensional shape model is displayed accurately and the watermark information is added to the three-dimensional shape model. By embedding, it was possible to prevent unauthorized duplication, falsification or theft by unauthorized third parties.

  FIG. 2 is a diagram showing parameters for embedding numerical information obtained by converting the watermark information in the present embodiment. These parameters are used in the initial display of the three-dimensional shape model. In this figure, a gaze point, a viewpoint, a view-up vector, a viewing angle, a display magnification, a near clipping plane, a far clipping plane, and a light source position are shown as parameters relating to the initial display of the three-dimensional shape model. A detailed embedding procedure will be described later.

  FIG. 3 is a diagram illustrating a gaze point, a viewpoint, and a view-up vector among the parameters illustrated in FIG. The gazing point 32 is a center point ahead of the line of sight and is expressed as position coordinates (x1, y1, z1) in a three-dimensional space, and is a numerical value obtained by converting watermark information of the lower bits of each of these x1, y1, and z1. Update with information. The viewpoint 33 is a principal point serving as a viewpoint of the user used for processing in the watermark information embedding device 100, and is represented as position coordinates (x2, y2, z2) in a three-dimensional space. Each of these x2, y2, and z2 Is updated with numerical information obtained by converting the watermark information into the lower bits. The view-up vector 31 is a direction vector representing the upward direction when the three-dimensional shape model is displayed on the display, and is represented as a direction vector (x3, y3, z3) in a three-dimensional space, and these x3, y3, z3 Are updated with numerical information obtained by converting the watermark information into the lower-order bits.

  FIG. 4 is a diagram illustrating the viewing angle, the near clipping plane, and the far clipping plane among the parameters shown in FIG. The viewing angle 41 is an angle of view of the screen width when viewed from the viewpoint 33, is represented as an angle θ, and is updated with numerical information obtained by converting watermark information into lower bits of the angle θ. The near clipping plane 42 is the closest distance from the projection plane 34 to the display area to be displayed on the display, and is expressed as a distance dn from the projection plane 34. The near clipping plane 42 is updated with numerical information obtained by converting watermark information into lower bits of the distance dn. To do. The far clipping plane 43 is the farthest distance from the projection plane 34 to the display area to be displayed on the display, and is represented as a distance df from the projection plane 34, and is updated with numerical information obtained by converting watermark information into lower bits of the distance df. To do.

  FIG. 5 is a diagram for explaining the display magnification ratio among the parameters shown in FIG. The display magnification 51 is a magnification when the three-dimensional shape model projected on the projection plane 34 is actually displayed on the display. The display magnification 51 is represented as a magnification f, and watermark information is converted into lower bits of the magnification f. Update with numerical information.

  Further, there is a light source position as a parameter other than those described above and shown in FIG. The light source position refers to the position of the light source that illuminates the three-dimensional shape model, and is represented as position coordinates (x4, y4, z4) in a three-dimensional space. The watermark information is converted into the lower bits of each of these x4, y4, and z4. Update with the numerical information.

  In addition, the parameter to be updated with the updated numerical information, the order of the parameter to be updated, and the number of lower-order bits to be updated in the parameter need to be determined in advance. In the present embodiment, watermark information is embedded by converting numerical information in the order of a gazing point, a viewpoint, a view-up vector, a viewing angle, a display magnification, a near clipping plane, a far clipping plane, and a light source position. The number of lower bits to be updated in these parameters is from the fifth decimal place to the sixth decimal place. It should be noted that the present invention is not limited to the parameters to be embedded in the numerical information obtained by converting the watermark information in the present invention, the order of parameters to be embedded, and the number of digits to be embedded in the parameters.

  The output processing unit 102 realizes the attachment step in the present invention, attaches the three-dimensional shape model output from the watermark information embedding unit 104 to the electronic document, and attaches the attached three-dimensional shape model to the display area of the electronic document. An electronic document to which a three-dimensional shape model is attached is stored in a file so as to be displayed in a part of the display area or in a part of the display area. The electronic document to which the three-dimensional shape model is attached may be an electronic document input from the data input processing unit 101 or an electronic document generated by the user via the input control unit 105. Further, when displaying the three-dimensional shape model on the display, the three-dimensional shape model is displayed according to the parameters relating to the initial display in which the watermark information is embedded. The output processing unit 102 attaches the three-dimensional shape model in which the watermark information is embedded to the electronic document, so that the watermark information embedded in the electronic document can be changed without changing the parameters included in the electronic document. This makes it possible to prevent unauthorized duplication, falsification or theft by unauthorized third parties.

  FIG. 6 is a block diagram showing a configuration of the three-dimensional shape model display apparatus according to the first embodiment of the present invention. As illustrated in FIG. 6, the three-dimensional shape model display apparatus 600 according to the present embodiment includes a document input processing unit 601, an output processing unit 602, a three-dimensional model acquisition unit 603, an information extraction unit 604, and an information conversion unit. 605.

  The document input processing unit 601 performs electronic document input processing and outputs the input electronic document to the output processing unit 602.

  When the electronic document input by the document input processing unit 601 includes a 3D shape model, the 3D model acquisition unit 603 acquires the 3D shape model and stores the acquired 3D shape model as information. The data is output to the extraction unit 604.

  The information extraction unit 604 realizes the extraction step of the present invention, extracts numerical information from the lower bits of the parameters related to the initial display of the input three-dimensional shape model, and outputs the extracted numerical information to the information conversion unit 605. . The parameters relating to the initial display to be extracted, the order of the parameters to be extracted, and the number of digits of the lower bits to be extracted are set in advance. Specifically, the watermark information embedding unit 104 of the watermark information embedding device 100 needs to correspond to preset parameters to be updated, the order of parameters to be updated, and the number of lower-order bits embedded with numerical information. is there. That is, in this embodiment, numerical values from the fifth decimal place to the sixth decimal place of each parameter in the order of gazing point, viewpoint, view-up vector, viewing angle, display magnification, near clipping plane, far clipping plane, and light source position. Extract information. By extracting in this way, watermark information can be extracted from the three-dimensional shape model, and the three-dimensional shape model can be accurately displayed. In the present invention, the parameter that is the source of extraction of numerical information obtained by converting watermark information in the present invention, the order of parameters to be extracted, and the number of digits to be embedded in the parameters are not limited. It is necessary to keep.

  The information conversion unit 605 converts the numerical information extracted from the information extraction unit 604 into watermark information. In the present embodiment, the extracted numerical information is converted into a character string indicating watermark information by the ASCII code.

  The output processing unit 602 displays the electronic document input from the document input processing unit 601 and the watermark information input from the information conversion unit 605 on a display.

  Although not shown in FIG. 6, an input control unit that controls the input device is provided to enable the user to change the viewpoint and the viewing angle, and the three-dimensional shape is determined according to the viewpoint and the field of view desired by the user. The model may be displayed. Since the watermark information is embedded in the parameters related to the initial display, the watermark information can be displayed appropriately even when the user changes the viewpoint or viewing angle after the three-dimensional shape model is first displayed. Is possible.

  Next, processing until the electronic document including the three-dimensional shape model in which the watermark information is embedded in the watermark information embedding device 100 according to the present embodiment configured as described above will be described. FIG. 7 is a flowchart showing a procedure of the above-described processing in the watermark information embedding device 100 according to the present embodiment. The three-dimensional shape model needs to be generated in advance using another device or program.

  First, the data input processing unit 101 performs an input process of an electronic document or 3D shape model data including a 3D shape model input to the watermark information embedding device 100 (step S701). Then, the three-dimensional model acquisition unit 103 acquires a three-dimensional shape model from the electronic document or the three-dimensional shape model data including the three-dimensional shape model that has been input by the data input processing unit 101 (step S702).

  When the three-dimensional model acquisition unit 103 acquires the three-dimensional shape model, watermark information can be input, and the user inputs a character string serving as watermark information from the input device. The input control unit 105 performs input processing of a character string that serves as input watermark information (step S703). In this processing procedure, the character string input as watermark information is “PATENT2004”.

  The watermark information conversion processing unit 106 converts the watermark information input by the input control unit 105 from a character string that is watermark information to numerical information (step S704). “PATENT2004” becomes “80658469788432303034” in order to convert the character string input by the user into numerical information by ASCII code.

  The watermark information embedding unit 104 updates the lower bits of the parameters related to the initial display of the three-dimensional shape model acquired by the three-dimensional model acquisition unit 103 with the numerical information converted by the watermark information conversion processing unit 106, thereby providing a watermark. The information is embedded and a three-dimensional shape model is output to the output processing unit 102 (step S705).

  FIG. 8 is a diagram showing an aspect from updating the parameters related to the initial display from the input character string to embedding watermark information. The character string shown in FIG. 8A is the character string input by the user in step S703, and the numerical information shown in FIG. 8B is the numerical information converted from the character string in step S704. is there. In FIG. 8C, the bits from the fifth decimal place to the sixth decimal place of the parameter relating to the initial display of the three-dimensional shape model are updated by the numerical information obtained by the conversion. As described above, the initial display parameters and the order to be updated are performed in the order of the gazing point, the viewpoint, the view-up vector, and the viewing angle. Since all the numerical information is embedded with these parameters, other parameters relating to the initial display are not updated. However, if the number of characters in the embedded character string increases, naturally, other initial display parameters are also updated.

  Returning to FIG. 7, the output processing unit 102 attaches the three-dimensional shape model input by the watermark information embedding unit 104 to the electronic document input from the data input processing unit 101 (step S706). When only 3D shape model data is input from the data input processing unit 101, the 3D shape model is attached to the electronic document generated by the user via the input control unit 105 from the input device. Then, the output processing unit 102 displays the electronic document attached with the three-dimensional shape model or stores it as a file. (Step S707).

  By embedding watermark information according to the processing procedure shown in FIG. 7, an accurate shape model of the three-dimensional shape model is retained, and unauthorized duplication, falsification, or plagiarism by an unauthorized third party is performed using the watermark information. It becomes possible to prevent.

  FIG. 9 is a diagram illustrating a change in display of an electronic document including a three-dimensional shape model before and after embedding watermark information. As shown in this figure, by embedding watermark information in parameters related to initial display, the 3D shape model is displayed in a different manner from before embedding by changing the gaze point, viewpoint, view-up vector, and viewing angle. However, the shape of the three-dimensional shape model is accurately displayed. In addition, in order to facilitate understanding in this figure, the change of the viewpoint etc. is expressed in an easy-to-understand manner, and in fact, since it is embedded in the lower bits of the parameter, in the display of the 3D shape model before and after embedding the watermark information, The distinction by the user's visual recognition becomes difficult.

  Next, in the three-dimensional shape model display apparatus 600 according to the present embodiment configured as described above, after an electronic document including a three-dimensional shape model is input, watermark information and an electronic document including the three-dimensional shape model are input. A process until the display is displayed will be described. In this procedure, the watermark information is extracted from the electronic document including the three-dimensional shape model in which the watermark information is embedded by the above-described embedding procedure. FIG. 10 is a flowchart showing the procedure of the extraction process described above in the three-dimensional shape model display apparatus 600 according to the present embodiment. The electronic document used in this processing procedure is an electronic document in which watermark information is embedded by the processing procedure of FIG.

  First, the document input processing unit 601 performs input processing of the input electronic document (step S1001). Next, when the input electronic document includes a three-dimensional shape model, the three-dimensional model acquisition unit 603 acquires the three-dimensional shape model (step S1002).

  From the three-dimensional shape model acquired by the three-dimensional model acquisition unit 603, the information extraction unit 604 determines whether or not numerical information is included, and extracts numerical information when determining that numerical information is included. (Step S1003). Specifically, the 3D model acquisition unit 603 performs the following operations in the order of gazing point, viewpoint, view-up vector, viewing angle, display magnification, near clipping plane, far clipping plane, and light source position, from the fifth decimal place to the sixth decimal place. It is determined whether or not numerical information is included with reference to the place bits, and when it is determined that numerical information is included, the numerical information is extracted. Since the electronic document used in this procedure includes numerical information up to the gazing point, viewpoint, view-up vector, and viewing angle, the numerical information is extracted from these parameters. The extracted numerical information is “80658469788432303034”.

  From the numerical information extracted by the information extraction unit 604, the information conversion unit 605 converts it into a character string indicating watermark information (step S1004). Specifically, the information extraction unit 604 converts the extracted numerical information “80658469788432303034” into a character string “PATENT2004” using an ASCII code, and outputs a character string indicating watermark information to the output processing unit 602.

  The output processing unit 602 displays the watermark information input from the information conversion unit 605 together with the electronic document input from the document input processing unit 601 (step S1005). Specifically, the output processing unit 602 displays an electronic document including the three-dimensional shape model input from the document input processing unit 601 and a character string “PATENT2004” indicating watermark information input from the information conversion unit 605.

  By extracting the watermark information by the processing procedure shown in FIG. 10 as described above, it is possible to accurately display the accurate model shape of the three-dimensional shape model, and unauthorized duplication by an unauthorized third party using the watermark information. It is possible to prevent tampering or theft.

  FIG. 11 is a diagram in which watermark information is displayed together with the electronic document input by the output processing unit 602. As shown in the figure, when displaying an electronic document including the input three-dimensional shape model, “PATENT2004” which is a character string indicating watermark information is displayed. The position where “PATENT2004” is displayed is not limited to the display range of the three-dimensional shape model, and may be a document display area of an electronic document, for example.

  FIG. 12 is a diagram illustrating a hardware configuration example of the watermark information embedding device or the three-dimensional shape model display device according to the embodiment. The information embedding device or the three-dimensional shape model display device described above can be realized by executing a program prepared in advance on a computer system such as a personal computer or a workstation. The entire computer is controlled by a CPU (Central Processing Unit) 1201. A memory 1203, a storage device 1207, an output control device 1206, and an input control device 1204 are connected to the CPU 1201 via a bus 1205. The memory 1203 stores at least a part of an OS (Operating System) program and application programs to be executed by the CPU 1201. The memory 1203 stores various data necessary for processing by the CPU 1201. The storage device 1207 stores an OS, various driver programs, application programs, detected data, and the like. Furthermore, the communication control device 1202 realizes data transmission / reception with the outside of the computer.

  A display device 1208 is connected to the output control device 1206. The output control device 1206 displays an image on the screen of the display device 1208 in accordance with a command from the CPU 1201. A keyboard 1209 and a pointing device 1210 are connected to the input control device 1204. The input control device 1204 transmits a signal sent from the keyboard 1209 or the pointing device 1210 to the CPU 1201 via the bus 1205.

  With the hardware configuration as described above, the processing functions of the present embodiment can be realized. In order to realize the present embodiment on a computer, a driver program is mounted on the computer.

  The watermark information embedding program executed by the watermark information embedding device of this embodiment or the three-dimensional shape display program executed by the three-dimensional shape model display device is a file in an installable format or an executable format. And recorded on a computer-readable recording medium such as a CD-ROM, floppy (R) disk, DVD or the like.

  Further, the watermark information embedding program or the three-dimensional shape display program of the present embodiment may be provided and distributed by storing it on a computer connected to a network such as the Internet and downloading it via the network. good.

  FIG. 13 is a diagram showing an example of an aspect from production to distribution and provision of an electronic document including a three-dimensional shape model embedded with watermark information created by the electronic document generation device 1301 that implements the watermark information embedding device. It is. After an electronic document including a three-dimensional shape model embedded with watermark information created by the electronic document generation apparatus 1301 is registered on the Web server 1302 and provided via the Internet, or stored in an electronic medium 1303 such as a CD or a DVD , Distributed to general users. Thereafter, a user who has acquired an electronic document from the Web server 1302 or the electronic medium 1303 implements a three-dimensional shape model display device by using an electronic document browsing program on each of the computers 1304a to n owned by the user. Allows viewing of documents.

  In the present embodiment, the watermark information embedding device 100 outputs an electronic document including a three-dimensional shape model. However, the present invention is not limited to this, and CAD including data including a three-dimensional shape model, for example, three-dimensional shape model data. Even for data, it is possible to embed and extract the watermark information of the present invention.

  Further, the parameters relating to the display of the three-dimensional shape model into which the watermark information is embedded are not limited to the above-described parameters. For example, the light source color (R), the light source color (G), and the light source color (B) Alternatively, watermark information may be embedded in parameters such as the distance between clipping planes. When the light source color is used as the watermark information embedding destination parameter, in the case of 24-bit color, 8 bits each of the light source color (R), the light source color (G), and the light source color (B) are allocated. For example, a bit may be used as a watermark information embedding destination. Furthermore, the parameter for embedding watermark information is not limited to the parameter related to the initial display of the three-dimensional shape model, and may be a parameter related to the display of the three-dimensional shape model.

  The watermark information embedding device 100 according to the present embodiment is not limited to generating a three-dimensional shape model in advance by another device or the like, and the watermark information embedding device 100 generates a three-dimensional shape model. It may be possible.

  In the present embodiment, the process of converting a character string into numerical information in the watermark information conversion processing unit 106 of the watermark information embedding device 100 or the numerical information in the information conversion unit 605 of the three-dimensional shape model display device 600 is converted into a character string. The process of converting to is not limited to the conversion process using the ASCII code, and may be performed using Unicode or the like. By using Unicode, it is possible to use 2-byte characters such as Japanese as watermark information. Moreover, when converting, it does not restrict | limit to codes based on standards, such as an ASCII code and Unicode, You may convert based on an original conversion table. In the case of conversion based on a unique conversion table, it is possible to further prevent unauthorized alteration by a third party. In addition, when the standard code is used, if it is necessary to keep the watermark information secret from the user, it is necessary to shield what the conversion rule is. There is no particular limitation on the shielding method. For example, it is conceivable that a character string is encrypted and converted into numerical information. As a result, when another user changes a part of the parameters, the information conversion unit 605 of the three-dimensional shape model display device 600 described later cannot be converted into watermark information, so the other user changes the watermark information. You can easily identify what you did.

(Second Embodiment)
In the three-dimensional shape model display apparatus according to the first embodiment, after the watermark information is extracted, the extracted watermark information is only displayed together with the electronic document. In such a three-dimensional shape model display device, the extracted watermark information is transmitted to an externally installed distribution server, whether or not it is appropriate is received from the distribution server, and the watermark information is received only when it is received as appropriate. And display electronic documents.

  Therefore, when watermark information is embedded in a three-dimensional shape model by the watermark information embedding device, a unique information and an address of a distribution server are added as watermark information for each viewer, and the watermark information for each viewer is embedded. The electronic text including the shape model is distributed by the distribution server. In the database provided in the distribution server, the unique information corresponding to the viewer and the address of the viewer serving as the distribution destination are associated and managed in an integrated manner. The configuration of the watermark information embedding device according to the second embodiment is the same as that of the watermark information embedding device according to the first embodiment, and the description of the watermark information embedding device is omitted. In addition, the total number of characters of the unique information and the address of the distribution destination does not exceed the maximum number of characters that can be embedded, which is determined from the number of parameters and the number of digits as the embedding destination.

  FIG. 14 is a block diagram showing a configuration of a three-dimensional shape model display device embedded in a three-dimensional shape model according to the second embodiment of the present invention. As illustrated in FIG. 14, the three-dimensional shape model display device 1400 according to the present embodiment includes a document input processing unit 601, an output processing unit 1403, a three-dimensional model acquisition unit 603, an information extraction unit 604, and an information conversion unit. 605, an information collation unit 1401, and a communication control unit 1402. In the following description, the same components as those of the above-described three-dimensional shape model display apparatus 600 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The information collation unit 1401 realizes the authentication step of the present invention, and a character string indicating watermark information is input from the information conversion unit 605, and the address of the distribution server 1404 and unique information of the viewer are acquired from the input character string. The unique information of the viewer is transmitted to the address of the distribution server 1404 via the communication control unit 1402, the authentication result by the distribution server 1404 is received via the communication control unit 1402, and the received authentication result is output together with the watermark information. The data is output to the processing unit 1403. Further, the unique information of the viewer corresponds to the unique identification information of the present invention.

  The communication control unit 1402 controls data communication between the three-dimensional shape model display device and the distribution server 1404.

    The output processing unit 1403 realizes the screen processing step of the present invention, determines whether or not it is appropriate based on the authentication result input from the information matching unit 1401 together with the watermark information, and only when it is appropriate, the document input processing unit The electronic document input from 601 is displayed on the display.

  The distribution server 1404 acquires the unique information of the viewer that has been transmitted, and the address of the sender of the information unique to the viewer matches the address of the distribution destination of the electronic text associated with the information unique to the database. Authentication is performed depending on whether or not to perform the authentication, and the authentication result is transmitted to the three-dimensional shape model display device 1400 indicated by the transmission source address.

  Next, after an electronic document including a 3D shape model is input in the 3D shape model display apparatus 1400 according to the present embodiment configured as described above, an electronic document including a watermark information and a 3D shape model is input. Processing until display is described. FIG. 15 is a flowchart showing the above-described processing procedure in the three-dimensional shape model display apparatus 1400 according to the present embodiment.

  First, similarly to steps S1001 to S1004 in FIG. 10 of the first embodiment, the process from the input process of the electronic document to the acquisition of the character string indicating the watermark information is performed (steps S1501 to S1504). Naturally, the character string acquired is different from the first embodiment, and is an address that identifies the unique information of the viewer and the distribution server 1404.

  The information matching unit 1401 transmits the acquired unique information of the viewer to the distribution server 1404 whose address is specified by the watermark information via the communication control unit 1402 (step S1505). At that time, in order to receive the authentication result from the distribution server 1404, the address of the three-dimensional shape model display device 1400 is attached to the transmission content.

  When the distribution server 1404 receives the unique information of the viewer, the distribution server 1404 performs authentication based on whether or not the transmission source address matches the distribution destination address associated with the specific information acquired in the database ( Step S1506). If they match, it is transmitted to the three-dimensional shape model display device 1400 indicated by the address of the transmission source.

  The information matching unit 1401 receives the authentication result from the distribution server 1404 via the communication control unit 1402, and outputs the received authentication result to the output processing unit 1403 (step S1507).

  The output processing unit 1403 determines whether the use is valid based on the authentication result input from the information matching unit 1401 (step S1508). If the authentication result indicates that the user is an appropriate viewer, it is recognized as valid use (step S1509), and an electronic document is displayed. If the authentication result indicates that the viewer is not appropriate, it is recognized that the use is not valid and the electronic document is not displayed (step S1510).

  If information other than the viewer's unique information and the address of the distribution server 1404 is also included as watermark information, the information matching unit 1401 outputs the included information to the output processing unit 1403, and the electronic document Watermark information may be displayed inside.

  In this embodiment, the 3D shape model is displayed accurately and the electronic document can be displayed or hidden depending on the authentication result, even though the viewer's unique information is included in the 3D shape model. As a result, electronic documents can be browsed only by viewers who have legitimate rights. That is, it becomes possible to protect the document or the three-dimensional shape model from unauthorized use.

  Further, the address of the distribution server 1404 that performs transmission / reception is not limited to being included in the watermark information, but may be described in the electronic text or set in the 3D shape model display device 1400 in advance. Further, the authentication of the browser by the distribution server 1404 is not limited to whether the addresses match, but may be, for example, authentication based on whether or not the viewer has already performed a charging procedure.

  In this embodiment, the electronic document is displayed only when the authentication result is appropriate. However, the processing based on the authentication result is not limited to display or not, and the viewer is charged. It is also possible to perform processing that causes the procedure to be taken.

  Further, the 3D shape model display device 1400 can only select display or non-display of the electronic text including the 3D shape model. However, the 3D shape model display device 1400 includes an input control unit that controls the input device, and the output processing unit When the electronic document can be edited with a function that can be stored, only the user who is recognized as the right holder by the authentication result may be permitted to edit the electronic document.

  As described above, the watermark information embedding method and watermark information embedding device according to the present invention embed watermark information, and the 3D shape model display method, the 3D shape model display device extracts the watermark information, and This is useful for displaying a model, and is particularly suitable for embedding or extracting watermark information using parameters related to the display of a three-dimensional shape model.

It is a figure which shows the functional block structure in 1st Embodiment of the watermark information embedding device concerning this invention. It is a figure which shows the parameter for the initial display of the three-dimensional shape model used in order to embed watermark information in 1st Embodiment concerning this invention. It is explanatory drawing of the viewpoint, gaze point, and view-up vector which are the parameters which embed watermark information in 1st Embodiment concerning this invention. It is explanatory drawing of the viewing angle which is the parameter which embeds watermark information in the 1st Embodiment concerning this invention, a near clipping plane, and a far clipping plane. It is explanatory drawing of the display magnification which is a parameter which embeds watermark information in 1st Embodiment concerning this invention. It is a figure which shows the functional block structure in 1st Embodiment of the three-dimensional shape model display apparatus concerning this invention. FIG. 6 shows a processing procedure from when an electronic document including a three-dimensional shape model in the first embodiment of the watermark information embedding device according to the present invention is input to when watermark information is embedded in the electronic document and then output. It is a flowchart. It is the figure which updated the parameter regarding initial display from the input character string in the 1st Embodiment of the watermark information embedding device concerning this invention, and showed the aspect until it embeds watermark information. It is the figure which showed the change of the display of the electronic document containing the three-dimensional shape model before embedding of the watermark information in 1st Embodiment of the watermark information embedding apparatus concerning this invention. Processing procedure from input of an electronic document including a 3D shape model in the first embodiment of the 3D shape model display device according to the present invention to display of an electronic document including watermark information and the 3D shape model It is the flowchart which showed. It is the figure which displayed the electronic document containing the 3D shape model in which the watermark information was embedded in 1st Embodiment of the 3D shape model display apparatus concerning this invention. It is a figure which shows the hardware structural example in 1st Embodiment of the watermark information embedding apparatus concerning this invention or a three-dimensional shape model display apparatus. From production to distribution and provision of an electronic document including a three-dimensional shape model in which watermark information created by a watermark information embedding device in the first embodiment of the three-dimensional shape model display device according to the present invention is embedded It is a figure which shows the example of an aspect. It is a figure which shows the functional block structure in 2nd Embodiment of the three-dimensional shape model display apparatus concerning this invention. Processing procedure from input of an electronic document including a three-dimensional shape model in the second embodiment of the three-dimensional shape model display device according to the present invention to display of an electronic document including watermark information and the three-dimensional shape model It is the flowchart which showed.

Explanation of symbols

31 View-up vector 32 Gaze point 33 View point 34 Projection plane 41 Viewing angle 42 Near clipping plane 43 Far clipping plane 51 Display magnification 100 Watermark information embedding device 101 Data input processing unit 102 Output processing unit 103 3D model acquisition unit 104 Watermark information Embedding unit 105 Input control unit 106 Watermark information conversion processing unit 600 Three-dimensional shape model display device 601 Document input processing unit 602 Output processing unit 603 Three-dimensional model acquisition unit 604 Watermark information extraction unit 605 Watermark information conversion unit 1201 CPU
1202 Communication control device 1203 Memory 1204 Input control device 1205 Bus 1206 Output control device 1207 Storage device 1208 Display device 1209 Keyboard 1210 Pointing device 1301 Electronic document generation device 1302 Web server 1303 Electronic medium 1304a to n Computer 1400 Three-dimensional shape model display device 1401 Information matching unit 1402 Communication control unit 1403 Output processing unit 1404 Distribution server

Claims (16)

A watermark information embedding method for embedding watermark information in three-dimensional shape model information having a geometric parameter that defines the shape of the three-dimensional shape model and a parameter relating to a display mode of the three-dimensional shape model defined by the geometric parameter. And
The embedding unit embeds the watermark information in the three-dimensional shape model information by changing predetermined bits of the parameter relating to the display mode in the three-dimensional shape model information to numerical information obtained by converting the watermark information. Embedding step,
Including a watermark information embedding method. The watermark information embedding method according to claim 1 , wherein the parameter relating to the display mode defines an initial display state of the three-dimensional shape model. The parameters related to the display mode are information defining the initial display state of the three-dimensional shape model, viewpoint position coordinate information indicating the position coordinates of the viewpoint, gazing point position coordinate information indicating the position coordinates of the gazing point, and display at the time of display Display direction information that determines the direction, viewing angle information that defines the field of view from the viewpoint, distance information of the near clipping plane, distance information of the far clipping plane, distance information between the clipping planes, display magnification information that indicates the display magnification, light source The watermark information embedding method according to claim 2, wherein any one of the position coordinates and the light source color information of the light source is used . A method of extracting watermark information from a three-dimensional shape model and then displaying the three-dimensional shape model,
Extracting step extracting means for extracting a predetermined bit value of the parameter related to the display mode of the three-dimensional shape model, the watermark information has been converted into numerical information,
3-dimensional shape model display method, which comprises a. In the extracting step, the extracting unit extracts watermark information converted into numerical information from a predetermined bit value of a parameter relating to a display mode of a three-dimensional shape model attached to an input document. The three-dimensional shape model display method according to claim 4 . A screen for displaying a display editing screen on which the output processing means displays or edits the three-dimensional shape model when the information included in the watermark information extracted in the extraction step satisfies a predetermined requirement 3-dimensional shape model display method according to claim 4 or 5, characterized in that the processing step further comprises. Unique identification information included in the watermark information extracted in the extraction step, and authentication information for determining whether or not the information collating unit has an authority to perform screen processing associated with the unique identification information in advance. an authentication step of performing authentication based on, further comprise,
The screen processing step displays a display editing screen on which display or editing of the three-dimensional shape model is performed only when the output processing means is authenticated that the screen processing is possible by the authentication performed in the authentication step. The three-dimensional shape model display method according to claim 6 . A watermark information embedding device that embeds watermark information in three-dimensional shape model information having a geometric parameter that defines the shape of the three-dimensional shape model and a parameter relating to a display mode of the three-dimensional shape model defined by the geometric parameter. And
An embedding unit that embeds watermark information in three-dimensional shape model information by changing predetermined bits of a parameter relating to a display mode in the three-dimensional shape model to numerical information obtained by converting watermark information;
A watermark information embedding device comprising: The watermark information embedding apparatus according to claim 8 , wherein the parameter relating to the display mode defines an initial display state of the three-dimensional shape model. The parameters related to the display mode are information defining the initial display state of the three-dimensional shape model, viewpoint position coordinate information indicating the position coordinates of the viewpoint, gazing point position coordinate information indicating the position coordinates of the gazing point, and display at the time of display Display direction information that determines the direction, viewing angle information that defines the field of view from the viewpoint, near clipping plane distance information, far clipping plane distance information, distance information between clipping planes, display magnification information that indicates display magnification, and light source The watermark information embedding apparatus according to claim 9, wherein any one of position coordinates of the light source and light source color information of the light source is used . An apparatus for displaying a 3D shape model after extracting watermark information from the 3D shape model,
Extraction means for extracting watermark information converted into numerical information from a predetermined bit value of a parameter relating to a display mode of the three-dimensional shape model;
A three-dimensional shape model display device comprising: Said extraction means from a predetermined bit value of parameters relating to the display mode of the three-dimensional shape model that is attached to the inputted document, to claim 11, characterized in that extracting the watermark information has been converted into numerical information The three-dimensional shape model display device described. An output processing means for displaying a display editing screen for displaying or editing a three-dimensional shape model when information included in the watermark information extracted by the extracting means satisfies a predetermined requirement; The three-dimensional shape model display device according to claim 11 or 12 , further comprising: Authentication is performed based on the unique identification information included in the watermark information extracted by the extraction means and authentication information for determining whether or not the user has the authority to perform screen processing associated with the unique identification information in advance. Further comprising information collating means to perform,
The output processing means displays a display edit screen on which a three-dimensional shape model is displayed or edited only when it is authenticated that screen processing is possible by the authentication performed by the authentication means. Item 14. The three-dimensional shape model display device according to Item 13 . A computer-readable medium having a program recorded thereon for causing the computer to execute the watermark information embedding method according to any one of claims 1 to 3 . A computer readable medium characterized by recording a program for executing a three-dimensional shape model display method on a computer according to any one of claims 4-7.

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