JP2006109071A - Electronic watermark verification method and system, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic watermark verification method and system, and a program capable of realizing an emulating means for reproducing characteristics unique to an image display medium and an image reading apparatus, confirming propriety of electronic watermark detection, evaluating a watermark embedded image displayed on the display medium without the need for using a real machine, and realizing functions of storing information knowable in the processes of setting and evaluation with respect to emulation used at the evaluation and an obtained evaluation value. <P>SOLUTION: The electronic watermark verification system includes: an environmental condition emulating means to which a detection environmental condition for detecting an electronic watermark is preset and for obtaining an effective value effected on detection by the detection environmental condition through arithmetic operations; an electronic watermark detection means for detecting the electronic watermark on the basis of the effect value obtained by the environmental condition emulating means to obtain a detection evaluation value; and a discrimination means for comparing the detected evaluation value for detecting the electronic watermark by the electronic watermark detection means with a prescribed threshold value to discriminate the detection propriety. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a service that reads an image with a digital watermark, detects a digital watermark from the image, and provides related information based on the detected digital watermark information. The present invention relates to a digital watermark verification method, system, and program for verifying that it is possible.

  The conventional digital watermark technology is mainly used for copyright protection and tampering judgment by detecting a digital watermark. In these detections, in addition to a method of directly detecting digital watermarks from digital data, a method of converting an image into digital data using a scanner and then reading the digital watermark is used.

  Also, in the service of printing an image with a digital watermark, reading the image with the camera attached to the mobile terminal, and guiding the user to the information source based on the read information, the accuracy of reading the digital watermark is important. I had.

  In such services, it is common to assume multiple types of portable cameras as devices that can use the service, and perform a detection confirmation test using all these models, or determine a standard model and confirm the detection. A test is being conducted.

In addition, the process of creating an image with digital watermark → printing → detection confirmation test is performed, and if necessary, the process of creating an image with a modified watermark strength is repeated, and consistent detection confirmation test conditions are maintained. There is a need (see Patent Documents 1 to 3).
Japanese Patent Laid-Open No. 2001-236344 “Special Document Management System, Special Document Management Method, and Recording Medium Recording Special Document Management Method Program” JP, 2001-313822, A "Image processing apparatus, image processing method, and storage medium" JP, 10-308870, A "Image processing system, apparatus suitable for the system, storage medium, and printed matter"

  However, in the conventional technology, when an image is read by a scanner, although there is a function that corrects the rotation direction caused by the positional relationship of the document, it is based on a camera attached to another reading device, for example, a portable terminal. No correction means for image input was provided.

  The present invention has been made in view of the above points, and can realize an emulating means for reproducing characteristics unique to an image display medium or an image reading apparatus, and it is possible to easily confirm whether or not a digital watermark can be detected by the emulating means. The watermarked image displayed on the display medium can be evaluated without using an actual device, and the information and information obtained during the setting and evaluation process related to the emulation used during the evaluation can be obtained. Another object of the present invention is to provide a digital watermark verification method, system, and program capable of realizing the function of storing evaluation values.

  The present invention according to claim 1 is a digital watermark verification method for verifying the quality of detection of a digital watermark embedded in an image, and a detection environment for detecting the digital watermark by an environmental condition emulating unit. A condition is set in advance, and an influence value of the detection environment condition on the detection is calculated, and the digital watermark is detected based on the influence value obtained by the environmental condition emulation means by the digital watermark detection means The detection evaluation value is obtained, and the detection evaluation value obtained by detecting the digital watermark by the digital watermark detection means by the determination means is compared with a predetermined threshold value to determine whether the detection is good or bad.

  Further, the present invention according to claim 2 is the input image shaping means for extracting the range in which the electronic watermark to be detected is embedded from the image, wherein the environmental condition emulating means is based on the first aspect. Is provided.

  In addition, according to a third aspect of the present invention, in any one of the first or second aspects, the environmental condition emulating means determines whether or not the image has an image size suitable for the detected environmental condition. Input image size determination means.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the environmental condition emulation means detects the digital watermark from an image captured by a camera capable of recording the captured image as digital data. Can be set as the environmental condition, and at least, conversion processing to the captured image size, rotation according to the position of the camera, distortion due to the shooting from an oblique direction, distortion characteristics inherent to the lens of the camera Addition of noise due to defocusing or camera shake, dust adhering to the camera lens, change in contrast due to characteristics of the camera, change in luminance, hue, and saturation, when the camera stores the captured image in a storage medium Any of the effects of data compression to be applied can be set as a calculation parameter of the calculation.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the environmental condition emulating means is caused by performing image processing based on the influence value for the image. Background information complementing means for filling the blank portion by executing complementation based on background information included in the image with respect to the blank portion on the image.

  Further, in the present invention described in claim 6, in any one of claims 1 to 5, the electronic watermark detection unit obtains position information of edges and frames of the image obtained along with the detection evaluation value, Evaluation value for displaying one of a watermark detection target image extracted based on the position information, a converted image information image obtained by normalizing the watermark detection target image, and a numerical value of the detection evaluation value Calculation basis display means is provided.

  Further, in the present invention described in claim 7, in any one of claims 1 to 6, the digital watermark detection unit obtains position information of edges and frames of the image obtained along with the detection evaluation value, Storage means for storing any one of a watermark detection target image extracted based on the position information, a converted image information image obtained by normalizing the watermark detection target image, and a numerical value of the detection evaluation value Is provided.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the detection environment condition is an image reading device for reading the image.

  According to a ninth aspect of the present invention, in the eighth aspect, the image reading apparatus has the configuration described in the first to seventh aspects.

  According to a tenth aspect of the present invention, there is provided a digital watermark verification system for verifying the quality of detection of a digital watermark embedded in an image, wherein a detection environment condition for detecting the digital watermark is set in advance. And an environmental condition emulating unit for calculating an influence value of the detected environmental condition on the detection by calculation, and detecting and detecting the digital watermark based on the influence value obtained by the environmental condition emulating unit. A digital watermark detection unit for obtaining an evaluation value; and a determination unit for comparing the detection evaluation value obtained by detecting the digital watermark by the digital watermark detection unit with a predetermined threshold to determine whether the detection is good or bad.

  The present invention described in claim 11 is the input image shaping means for extracting the range in which the electronic watermark to be detected is embedded from the image, wherein the environmental condition emulating means is based on the claim 10. Is provided.

  Further, according to a twelfth aspect of the present invention, in any one of the tenth or eleventh aspects, the environmental condition emulating means determines whether or not the image has an image size suitable for the detected environmental condition. Input image size determination means.

  Further, in the present invention described in claim 13, in any one of claims 10 to 12, the environmental condition emulation unit detects the digital watermark from an image captured by a camera capable of recording the captured image as digital data. Can be set as the environmental condition, and at least, conversion processing to the captured image size, rotation according to the position of the camera, distortion due to the shooting from an oblique direction, distortion characteristics inherent to the lens of the camera Addition of noise due to defocusing or camera shake, dust adhering to the camera lens, change in contrast due to characteristics of the camera, change in luminance, hue, and saturation, when the camera stores the captured image in a storage medium Any of the effects of data compression to be applied can be set as a calculation parameter of the calculation.

  Further, the present invention according to claim 14 is the method according to any one of claims 10 to 13, wherein the environmental condition emulating unit is caused by execution of image processing based on the influence value with respect to the image. Background information complementing means for filling the blank portion by executing complementation based on background information included in the image with respect to the blank portion on the image.

  Further, in the present invention described in claim 15, in any one of claims 10 to 14, the digital watermark detection unit obtains position information of edges and frames of the image obtained along with the detection evaluation value, Evaluation value for displaying one of a watermark detection target image extracted based on the position information, a converted image information image obtained by normalizing the watermark detection target image, and a numerical value of the detection evaluation value Calculation basis display means is provided.

  Further, in the present invention described in claim 16, in any one of claims 10 to 15, the electronic watermark detection unit obtains position information of edges and frames of the image obtained along with the detection evaluation value, Storage means for storing any one of a watermark detection target image extracted based on the position information, a converted image information image obtained by normalizing the watermark detection target image, and a numerical value of the detection evaluation value Is provided.

  According to a seventeenth aspect of the present invention, in any one of the tenth to sixteenth aspects, the detection environment condition is an image reading device for reading the image.

  According to an eighteenth aspect of the present invention, in the seventeenth aspect, the image reading apparatus has the configuration described in the tenth to sixteenth aspects.

  The present invention according to claim 19 is a digital watermark verification program for verifying the quality of detection of a digital watermark embedded in an image, wherein the digital watermark is detected by an environmental condition emulation means. A detection environment condition is set in advance, and an influence value of the detection environment condition on the detection is obtained by calculation, and the digital watermark is based on the influence value obtained by the environmental condition emulation means by the digital watermark detection means. And detecting a detection evaluation value and comparing the detection evaluation value obtained by detecting the digital watermark by the digital watermark detection means with a predetermined threshold by the determination means and determining whether the detection is good or bad.

  The present invention according to claim 20 is the input image shaping means for extracting the range in which the electronic watermark to be detected is embedded from the image according to claim 19, wherein the environmental condition emulation means extracts the range in which the electronic watermark to be detected is embedded. Is provided.

  Further, in the present invention described in claim 21, in any one of claims 19 and 20, the environmental condition emulation means determines whether or not the image has an image size suitable for the detected environmental condition. Input image size determination means.

  According to a twenty-second aspect of the present invention, in any one of the nineteenth to twenty-first aspects, the environmental condition emulating unit detects the digital watermark from an image captured by a camera capable of recording the captured image as digital data. Can be set as the environmental condition, and at least, conversion processing to the captured image size, rotation according to the position of the camera, distortion due to the shooting from an oblique direction, distortion characteristics inherent to the lens of the camera Addition of noise due to defocusing or camera shake, dust adhering to the camera lens, change in contrast due to characteristics of the camera, change in luminance, hue, and saturation, when the camera stores the captured image in a storage medium Any of the effects of data compression to be applied can be set as a calculation parameter of the calculation.

  Further, the present invention described in claim 23 is, in any one of claims 19 to 22, wherein the environmental condition emulating means is caused by performing image processing based on the influence value for the image. Background information complementing means for filling the blank portion by executing complementation based on background information included in the image with respect to the blank portion on the image.

  Further, in the present invention described in claim 24, in any one of claims 19 to 23, the digital watermark detection means obtains position information of edges and frames of the image obtained along with the detection evaluation value, Evaluation value for displaying one of a watermark detection target image extracted based on the position information, a converted image information image obtained by normalizing the watermark detection target image, and a numerical value of the detection evaluation value Calculation basis display means is provided.

  Further, in the present invention described in claim 25, in any one of claims 19 to 24, the electronic watermark detection means obtains position information of edges and frames of the image obtained along with the detection evaluation value, Storage means for storing any one of a watermark detection target image extracted based on the position information, a converted image information image obtained by normalizing the watermark detection target image, and a numerical value of the detection evaluation value Is provided.

  According to a twenty-sixth aspect of the present invention, in any one of the nineteenth to twenty-fifth aspects, the detection environment condition is an image reading device for reading the image.

  According to a twenty-seventh aspect of the present invention, in the twenty-sixth aspect, the image reading device has the configuration described in the nineteenth to twenty-fifth aspects.

  According to the present invention, it is possible to realize an emulating unit for reproducing characteristics specific to an image display medium or an image reading device, and it is possible to easily confirm whether or not a digital watermark can be detected by using the emulating unit, and use an actual device. The watermarked image displayed on the display medium can be evaluated without any problem, and the function for saving the settings related to the emulation used during the evaluation and the information obtained during the evaluation process and the obtained evaluation values A possible digital watermark verification method, system, and program can be provided.

  The digital watermark verification method, system, and program of the present invention will be described below with reference to the drawings. It should be noted that the following embodiments are merely for explaining the present invention, and do not limit the scope of the present invention. Therefore, those skilled in the art can employ various embodiments including each or all of these elements, and these embodiments are also included in the scope of the present invention.

  FIG. 1 is an explanatory diagram for explaining an overall configuration according to an embodiment of a digital watermark verification method and system and program of the present invention.

  FIG. 1 shows a control function 1 for controlling the operation of the entire system, an image input function 2, a watermark information function 3, an input image shaping function 4, an image size determination function 5, and an image reading device emulator. Rate function 6, background information complementing function 7, digital watermark detection function 8, digital watermark detection result display function 9, detection result image storage function 10, watermark information range setting function 11, and image size determination threshold setting function 12, an image reading device emulation setting / saving function 13, and a threshold setting function 14 are shown.

  Each of the configurations shown in FIG. 1 is a function necessary for configuring the digital watermark embedding method according to the embodiment of the present invention. These functions are realized, for example, by a program that can be installed and executed in a computer, or can be realized by a system that is a combination of information processing apparatuses having the respective functions.

  Furthermore, these functions may be configured as a computer program, and installed and executed on a server arranged connected to a network such as the Internet.

  In the embodiment of the present invention referred to in FIG. 1 having such a configuration, digital watermark embedding is executed by the information processing flow shown in FIGS.

  First, in the pre-processing means 20 in FIG. 2, a printed material that is an image (original image) to be embedded with a digital watermark is scanned (S1). The scanned image is stored as digital data (S2).

  When an image with a digital watermark is used as a part of a component of a printed matter, the image including the digital watermark or its vicinity is cut out using a scanner or the like and stored as electronic data.

  Next, the processed image ((B) in FIG. 2) processed by the pre-processing means 20 is input to the detection confirmation means 21 as an input image by the image input function 2 referred to in FIG. 1 (S3). ).

  First, the image input to the detection confirmation means 21 by the image input function 2 is correctly cut out again along the outer periphery of the image when the input image shaping is instructed (S4). The shaping of the input image is executed by the input image shaping function 4 in accordance with the contents instructed in the input image shaping instruction (S14).

  The input image shaping instruction executes an instruction as to whether or not to correctly re-cut the data created by the scanner or the like along the outer periphery of the image. The purpose of this instruction is as follows.

  First, when the cutout is not performed along the outer periphery, the influence of the image reading device emulation function 6 also acts on the boundary information between the image neighborhood information (hereinafter referred to as the background) and the image itself. When the digital watermark is detected, the process of identifying the target image from the background can be affected.

  Further, when the cutout is performed along the outer periphery, the target image is cut out from the background before being affected by the image reading device emulation function 6, so that the image reading device emulation function 6 affects only the target image. It is possible to determine whether or not the digital watermark can be read from the target image in a pure frame.

  Next, in the image size determination (S5) executed by the image size determination function 5, the input image size (vertical and horizontal lengths) based on the scanning dpi value designated by the image size determination threshold value / scan dpi value (S15). At the same time, the size of the input image is determined according to the determination threshold, and if the image size is less than the threshold, a warning is displayed.

  Note that the image size determination threshold value / scan dpi value (S15) is executed by the image size determination threshold value / scan dpi value function 12, and when it is assumed that a watermarked image on a printed material is captured using a portable camera, When the image size (length and width) is small, it is necessary to shoot with a portable camera close to the paper surface. Some portable cameras do not have a close-up function. Set to issue a warning. In addition, a dpi value at the time of scanning required for calculating the image size is also indicated.

  Next, in order to actually emulate reading by the image reading apparatus, the image processing by the image reading apparatus emulation (S6) is executed in the image reading apparatus emulation function 6.

  This image reading device emulation (S6) is executed by the image reading device emulation setting / storing function 13 to determine an image reading device emulation setting value (S16). Note that when an image with a digital watermark displayed on a display medium is read by an image reading device such as a camera of a mobile terminal, the captured image is enlarged / reduced or viewed from an oblique direction depending on the positional relationship between the display medium and the camera. Deformation (projection), skew, or rotation of the entire image occurs. In anticipation of such a phenomenon, a range of deformation allowed when shooting with these cameras is set.

  In addition, characteristics of the reading device itself such as a camera or a scanner affect the captured image. For example, distortion of the lens, camera shake and blur at the time of shooting, changes in contrast due to the characteristics of the receiving element, changes in brightness, hue, and saturation, dust adhering to the lens, image compression when saving the scanned image as a file There is a possibility of deterioration due to. In anticipation of such a phenomenon, setting values for emulating these characteristics are designated.

  Next, when background information complementation is instructed by the background information complement instruction (S17) executed by the background information complementation function 7, the newly generated background is the same as the original background based on the original background information. Background information complementation (S7) is performed. In addition, when it is set not to perform re-cutout along the outer periphery of the target image by the background information complement instruction, when the image is rotated or deformed by the image reading device emulation (S6), the image including the background is processed. Therefore, a new background is generated outside the original background portion.

  For this reason, when detecting a digital watermark, the background and the target image are distinguished, but it is difficult to distinguish the new background from the original background and the target image. Create a new background based on the information so that it is the same as the original background.

  Next, digital watermark reading is performed on the image data created by the background information complement (S7) by the digital watermark detection function 8 using the watermark key given by the watermark information range setting (S18) (S8).

  In the watermark information range setting (S18) performed by the watermark information range setting function 11 and the watermark information function 3, in order to prevent unauthorized use of information embedded in the digital watermark, The value of the business operator identification code permitted for each business operator who uses the ID, the range thereof, the period during which the input of the value is permitted, and the watermark key used when embedding the digital watermark are designated. In order to increase security, this setting value can be handled as encrypted information.

  Next, threshold evaluation (S9) of the evaluation value is executed based on the evaluation value obtained when reading the digital watermark and the threshold for determination (S19) set by the threshold setting function 14. Note that the determination threshold value (S19) is determined based on the evaluation value obtained when the digital watermark is detected, and the threshold value for the determination is specified.

  In this evaluation value threshold determination (S9), regardless of whether the threshold value is equal to or higher than the threshold value or lower than the threshold value, the detection result (the digital watermark detection evaluation value is obtained from the information obtained in the process of reading the digital watermark). One of the position information of the edge and frame of the image obtained in the calculation process, the watermark detection target image extracted based on the information, the converted image information image that has been normalized, and the detection evaluation value Or, a plurality) is displayed by the digital watermark detection result display function 9 (S12).

  Further, after the digital watermark detection result is displayed (S12), image output (S13) is executed.

  If the result of the threshold value determination (S9) of the evaluation value is less than the threshold value, “less than threshold value” is displayed (S10). If it is greater than or equal to the threshold, it is displayed that “it is greater than or equal to the threshold” (S11).

  Next, information obtained in the process of reading the digital watermark (information on the edge and frame of the image obtained in the process of calculating the detection evaluation value of the digital watermark, and the watermark detection target image extracted based on the information The converted image information image that has been normalized and one or more of the detection evaluation values) are stored by the detection result image storage function 10.

  In the embodiment of the present invention described above, there is provided a digital watermark verification system for verifying the quality of detection of a digital watermark embedded in an image, wherein a detection environment condition for detecting the digital watermark is set in advance. An environmental condition emulating means for calculating the influence value of the detected environmental condition on the detection, and detecting a digital watermark based on the influence value obtained by the environmental condition emulating means to obtain a detection evaluation value And a determination means for determining whether the detection is good or not by comparing a detection evaluation value obtained by detecting the digital watermark by the digital watermark detection means with a predetermined threshold value.

  The environmental condition emulation means includes input image shaping means for extracting a range in which a digital watermark to be detected is embedded from an image.

  The environmental condition emulation means includes input image size determination means for determining whether or not the image has an image size suitable for the detection environmental condition.

  In addition, the environmental condition emulation means can set a case where a digital watermark is detected from an image captured by a camera capable of recording the captured image as digital data, and at least the conversion processing to the captured image size is possible. , Rotation due to camera position, distortion due to oblique shooting, distortion characteristics inherent to camera lens, defocusing and camera shake, addition of noise due to dust attached to camera lens, contrast change due to camera characteristics, brightness / Any one of a change in hue / saturation and an effect of data compression performed when the camera stores a captured image in a storage medium can be set as a calculation parameter of the calculation.

  In addition, the environmental condition emulating means performs a blank based on background information included in the image for a blank portion on the image generated by the execution of the image processing based on the influence value on the image. A background information complementing means for filling the part is provided.

  In addition, the digital watermark detection means performs normalization processing on the position information of the edges and frames of the image obtained along with the detection evaluation value, the watermark detection target image extracted based on the position information, and the watermark detection target image. Evaluation value calculation basis display means for displaying any one of the converted image information image and the numerical value of the detected evaluation value.

  In addition, the digital watermark detection means performs normalization processing on the position information of the edges and frames of the image obtained along with the detection evaluation value, the watermark detection target image extracted based on the position information, and the watermark detection target image. Storage means for storing any one of the converted image information image and the numerical value of the detected evaluation value.

  The detection environment condition is an image reading device for reading an image.

  According to the embodiment of the present invention described above, lens distortion, focus accuracy, contrast change, JPEG compression method unique to a portable camera, and events occurring during shooting include image deformation, camera shake, By emulating defocus, lens dirt, etc., it can contribute to the improvement of reproducibility and working efficiency especially during retesting.

  In addition, it has a function to store settings related to emulation used during evaluation, information obtained during the evaluation process (geometric transformation images, identification point information, etc. implemented for watermark detection), and obtained evaluation values. Therefore, by positioning these as work trails, they can be used as data for guaranteeing the quality of the created digital watermarked image data.

  Furthermore, by collecting and analyzing a large amount of these data and feeding back the obtained know-how to the digital watermark embedding process, it is possible to contribute to the creation of a higher quality digital watermark embedded image.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram for explaining an overall configuration according to an embodiment of a digital watermark verification method and system and a program of the present invention. 1 is a flowchart for explaining data processing steps according to an embodiment of a digital watermark verification method and system and a program of the present invention. 1 is a flowchart for explaining data processing steps according to an embodiment of a digital watermark verification method and system and a program of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control function 2 Image input function 3 Watermark information function 4 Input image shaping function 5 Image size determination function 6 Image reader emulation function 7 Background information complementation function 8 Digital watermark detection function 9 Digital watermark detection result display function 10 Detection result image storage Function 11 Watermark information range setting function 12 Image size determination threshold setting function 13 Image reading device emulation setting / saving function 14 Threshold setting function 20 Preprocessing means 21 Detection confirmation means

Claims (27)

An electronic watermark verification method for verifying the quality of detection of an electronic watermark embedded in an image,
Presetting a detection environment condition for detecting the digital watermark by an environmental condition emulating means, and calculating an influence value of the detection environment condition on the detection;
Detecting a digital watermark based on the influence value obtained by the environmental condition emulation means by a digital watermark detection means to obtain a detection evaluation value;
Comparing the detection evaluation value obtained by detecting the digital watermark by the digital watermark detection unit with a predetermined threshold by the determination unit to determine whether the detection is good or bad;
An electronic watermark verification method comprising: The environmental condition emulation means includes:
2. The digital watermark verification method according to claim 1, further comprising an input image shaping unit for extracting a range in which the digital watermark to be detected is embedded from the image. The environmental condition emulation means includes:
3. The digital watermark verification method according to claim 1, further comprising input image size determination means for determining whether or not the image has an image size suitable for the detection environment condition. The environmental condition emulation means includes:
A case where the electronic watermark is detected from an image captured by a camera capable of recording a captured image as digital data can be set as the environmental condition,
At least conversion processing to the photographed image size, rotation according to the position of the camera, distortion due to the photographing from an oblique direction, distortion characteristics inherent to the camera lens, defocusing and camera shake, dust adhering to the camera lens Any of the noise addition due to, the change in contrast due to the characteristics of the camera, the change in brightness, hue, and saturation, the effect of data compression performed when the camera stores the captured image in the storage medium, The digital watermark verification method according to claim 1, wherein the digital watermark verification method can be set as a calculation parameter of the calculation. The environmental condition emulation means includes:
Filling the blank portion by performing complementation based on background information included in the image with respect to the blank portion on the image caused by execution of image processing based on the influence value on the image 5. The digital watermark verification method according to claim 1, further comprising background information complementing means. The digital watermark detection means includes
Position information of edges and frames of the image obtained along with the detection evaluation value, watermark detection target image extracted based on the position information, and converted image information subjected to normalization processing of the watermark detection target image The digital watermark verification method according to claim 1, further comprising an evaluation value calculation basis display means for displaying any one of an image and a numerical value of the detected evaluation value. The digital watermark detection means includes
Position information of edges and frames of the image obtained along with the detection evaluation value, watermark detection target image extracted based on the position information, and converted image information subjected to normalization processing of the watermark detection target image The digital watermark verification method according to claim 1, further comprising storage means for storing any one of an image and a numerical value of the detection evaluation value. The detection environmental conditions are:
The digital watermark verification method according to claim 1, wherein the digital watermark verification method is an image reading device for reading the image. The image reading device includes:
The digital watermark verification method according to claim 8, comprising the configuration according to claim 1. A digital watermark verification system for verifying the quality of detection of a digital watermark embedded in an image,
A detection environment condition for detecting the digital watermark is set in advance, and an environmental condition emulation means for calculating an influence value of the detection environment condition on the detection by calculation,
Digital watermark detection means for detecting the digital watermark based on the influence value obtained by the environmental condition emulation means to obtain a detection evaluation value;
A determination means for determining the quality of detection by comparing a detection evaluation value obtained by detecting the digital watermark with the digital watermark detection means with a predetermined threshold;
An electronic watermark verification system comprising: The environmental condition emulation means includes:
The digital watermark verification system according to claim 10, further comprising an input image shaping unit for extracting a range in which the digital watermark to be detected is embedded from the image. The environmental condition emulation means includes:
12. The digital watermark verification system according to claim 10, further comprising input image size determination means for determining whether or not the image has an image size suitable for the detection environment condition. The environmental condition emulation means includes:
A case where the electronic watermark is detected from an image captured by a camera capable of recording a captured image as digital data can be set as the environmental condition,
At least conversion processing to the photographed image size, rotation according to the position of the camera, distortion due to the photographing from an oblique direction, distortion characteristics inherent to the camera lens, defocusing and camera shake, dust adhering to the camera lens Any of the noise addition due to, the change in contrast due to the characteristics of the camera, the change in brightness, hue, and saturation, the effect of data compression performed when the camera stores the captured image in the storage medium, The digital watermark verification system according to claim 10, wherein the digital watermark verification system can be set as a calculation parameter of the calculation. The environmental condition emulation means includes:
Filling the blank portion by performing complementation based on background information included in the image with respect to the blank portion on the image caused by execution of image processing based on the influence value on the image The digital watermark verification system according to claim 10, further comprising background information complementing means. The digital watermark detection means includes
Position information of edges and frames of the image obtained along with the detection evaluation value, watermark detection target image extracted based on the position information, and converted image information subjected to normalization processing of the watermark detection target image 15. The digital watermark verification system according to claim 10, further comprising an evaluation value calculation basis display means for displaying any one of an image and a numerical value of the detected evaluation value. The digital watermark detection means includes
Position information of edges and frames of the image obtained along with the detection evaluation value, watermark detection target image extracted based on the position information, and converted image information subjected to normalization processing of the watermark detection target image 16. The digital watermark verification system according to claim 10, further comprising storage means for storing any one of an image and a numerical value of the detection evaluation value. The detection environmental conditions are:
The digital watermark verification system according to claim 10, wherein the digital watermark verification system is an image reading device for reading the image. The image reading device includes:
The digital watermark verification system according to claim 17, comprising the configuration according to claim 10. An electronic watermark verification program for verifying the quality of detection of an electronic watermark embedded in an image,
Presetting a detection environment condition for detecting the digital watermark by an environmental condition emulating means, and calculating an influence value of the detection environment condition on the detection;
Detecting a digital watermark based on the influence value obtained by the environmental condition emulation means by a digital watermark detection means to obtain a detection evaluation value;
Comparing the detection evaluation value obtained by detecting the digital watermark by the digital watermark detection unit with a predetermined threshold by the determination unit to determine whether the detection is good or bad;
A digital watermark verification program characterized by comprising: The environmental condition emulation means includes:
20. The digital watermark verification program according to claim 19, further comprising input image shaping means for extracting a range in which the digital watermark to be detected is embedded from the image. The environmental condition emulation means includes:
21. The digital watermark verification program according to claim 19, further comprising input image size determination means for determining whether or not the image has an image size suitable for the detection environment condition. The environmental condition emulation means includes:
A case where the electronic watermark is detected from an image captured by a camera capable of recording a captured image as digital data can be set as the environmental condition,
At least conversion processing to the photographed image size, rotation by the position of the camera, distortion due to the photographing from an oblique direction, distortion characteristics inherent to the lens of the camera, defocus and camera shake, dust attached to the lens of the camera Any one of the following: addition of noise due to, change in contrast due to characteristics of the camera, change in luminance, hue, and saturation, influence of data compression performed when the camera stores the captured image in the storage medium, The digital watermark verification program according to any one of claims 19 to 21, wherein the digital watermark verification program can be set as a calculation parameter of a calculation. The environmental condition emulation means includes:
Filling the blank portion by performing complementation based on background information included in the image with respect to the blank portion on the image caused by execution of image processing based on the influence value on the image The digital watermark verification program according to claim 19, further comprising background information complementing means. The digital watermark detection means includes
Position information of edges and frames of the image obtained along with the detection evaluation value, watermark detection target image extracted based on the position information, and converted image information subjected to normalization processing of the watermark detection target image The digital watermark verification program according to any one of claims 19 to 23, further comprising evaluation value calculation basis display means for displaying any one of an image and a numerical value of the detected evaluation value. The digital watermark detection means includes
Position information of edges and frames of the image obtained along with the detection evaluation value, watermark detection target image extracted based on the position information, and converted image information subjected to normalization processing of the watermark detection target image The digital watermark verification program according to any one of claims 19 to 24, further comprising storage means for storing any one of an image and a numerical value of the detection evaluation value. The detection environmental conditions are:
The digital watermark verification program according to any one of claims 19 to 25, wherein the digital watermark verification program is an image reading device for reading the image. The image reading device includes:
27. The electronic watermark verification program according to claim 26, comprising the configuration described in any one of claims 19 to 25.

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