JP7098131B2 - Authentication image acquisition device, authentication image acquisition system, and authentication image acquisition method - Google Patents

Description

The present invention relates to an authentication image acquisition device, an authentication image acquisition system, and an authentication image acquisition method. More specifically, the present invention acquires an authentication image for authentication using an image such as a product label. The present invention relates to an apparatus, an authentication image acquisition system, and an authentication image acquisition method.

Conventionally, a technique for individually identifying an article such as food, beverage, medicine, or agricultural product has been developed as a means for providing safety and security to consumers. For example, there is known a technique of photographing a drug placed on a drug placing portion and recognizing the identification information of the drug based on the image of the photographed drug (see Patent Document 1).

In recent years, in order to identify individual articles, ultra-high-definition techniques for distinguishing fine color shades of articles have been developed. With such a technique, it is possible to grasp a difference that cannot be discerned by the human eye from a specific area such as a label attached to the same product, and to identify an individual without attaching an IC tag or the like separately.

It is important to take a high-quality image in the identification of an individual based on an image, and a technique for obtaining a high-quality image from such a viewpoint has also been developed (see, for example, Patent Document 2).

JP-A-2017-158743 JP-A-2017-1837992

The shape of the individual article to be identified may consist of a curved surface, and a region on the curved surface may be used as the region to be identified. However, it is very difficult to capture a region on a curved surface with a high-definition image. For example, when an image is taken of a label attached to the side surface of an ampoule to identify an ampoule of a drug, there is a problem that blurring or out of focus are likely to occur.

The present invention has been made in view of such a problem, and an object thereof is an authentication image acquisition device capable of capturing an image on the surface of an article with improved fineness, and an authentication image. The purpose is to provide an acquisition system and a method for acquiring an image for authentication.

In order to solve such a problem, the authentication image acquisition device according to the present invention has a storage means that stores a template that defines an imaging position of the authentication image, and a predetermined area of an object captured by the imaging device. The image is compared with the template stored in the storage means to acquire the matching degree, and when the acquired matching degree is equal to or higher than the first threshold value, the captured image is used for authentication. As an image candidate, a holding means held in the storage means is provided.

Here, when the acquired matching degree exceeds the matching degree of the image held immediately before, the holding means shall overwrite the authentication image held immediately before with the newly captured image. Can be done.

Further, when the acquired matching degree becomes equal to or higher than the first threshold value and then becomes equal to or lower than the second threshold value, a file saving means for saving the held image as an authentication image in a file is further provided. Can be.

Further, when the degree of matching acquired by the comparison means is equal to or greater than the first threshold value, the holding means determines the moving distance and the degree of matching of two temporally continuous images among the captured images. When the determination means for determining the stationary state of the image and the determination means determine that the image is stationary at least twice in succession, the captured second and subsequent images are image candidates for authentication. Can be held as.

Further, the holding means prohibits holding the captured image as an authentication image candidate when the darkness of a predetermined region in the captured image is equal to or higher than the third threshold value. be able to.

Further, it may be further provided with a display means for displaying the captured image.

Further, the display means may be further provided with a control means for displaying the guide image for positioning the captured image on the captured image.

Further, the display means can change the displayed image in the first aspect when the acquired degree of matching is equal to or higher than the first threshold value.

Further, the display means shall change the displayed image in the second aspect when the acquired degree of matching becomes equal to or more than the first threshold value and then becomes equal to or less than the second threshold value. Can be done.

Further, the display means can change the displayed image in the third aspect when the darkness of the predetermined region in the captured image is equal to or higher than the third threshold value.

According to another aspect of the present invention, the authentication image acquisition system according to the present invention is an image pickup device that captures a predetermined area of an object and an authentication image acquisition device, and captures the authentication image. A storage means that stores a template that defines a position, a comparison means that compares an image of a predetermined area of an object captured by an imaging device with a template stored in the storage means, and obtains a degree of matching. When the acquired degree of matching is equal to or higher than the first threshold value, the device includes an authentication image acquisition device including a holding means for holding the captured image as an authentication image candidate in the storage means.

According to another aspect of the present invention, the method for acquiring an image for authentication executed by the computer according to the present invention includes a step of storing a template defining an imaging position of the image for authentication in the storage unit of the computer and imaging. The step of comparing the image of a predetermined area of the object captured by the device with the template stored in the storage means to acquire the degree of matching, and the acquired degree of matching is equal to or higher than the first threshold value. In this case, the storage unit includes a step of holding the captured image as an image candidate for authentication.

According to another aspect of the present invention, the computer program according to the present invention causes the computer to function as the above-mentioned authentication image acquisition device.

According to another aspect of the present invention, the computer-readable recording medium according to the present invention causes the computer to function as the above-mentioned authentication image acquisition device.

According to the present invention, it is possible to take an image of a predetermined area on the surface of an article with improved definition in order to identify the article.

By displaying the guide image when taking an image of a predetermined area of the article, imaging becomes quick and easy.

It is a perspective view which shows the appearance structure of the image pickup device which concerns on one Embodiment of this invention. 2A is a perspective view of the external configuration of the image pickup device 100 in which the ampoule is installed, FIG. 2B is a side view seen from the direction of arrow A in FIG. 2A, and FIG. 2C is FIG. It is a side view seen from the arrow B direction of (a). It is a perspective view which shows the structure of the part of a camera unit. It is a block diagram which shows the functional structure of the image acquisition system for authentication which concerns on one Embodiment of this invention. It is a flowchart which shows the procedure of the acquisition method of the authentication image which concerns on one Embodiment of this invention. It is a figure which shows the example of the label attached to the surface of an ampoule. Here is an example of a template that is compared to a given area of the label. It is a figure which shows the example of the image captured by a camera, FIG. .. It is a figure explaining the outline of the operation of imaging a label while adjusting the position of an ampoule. It is a figure explaining the operation which prevents blurring of a subject which concerns on one Embodiment of this invention. It is a figure which shows the example of the captured image, (a) shows the example of a good image, (b) shows the example of a failed image. It is a figure which shows the display example of the guide image which concerns on one Embodiment of this invention. It is a figure which shows the image displayed on the PC which concerns on one Embodiment of this invention. It is a flowchart which shows the procedure of the acquisition method of the authentication image which concerns on one Embodiment of this invention. It is a figure for demonstrating the position of the subject photographed by the image pickup apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of the image of the label of an ample to be captured, (a) is the image which the shadow of the opening edge of a housing is not reflected on the label, (b) is the image of the opening edge of a housing on a label. It is a figure which shows the example of the image which a shadow is reflected. It is a graph which showed the average of the lightness with respect to the x coordinate (horizontal direction) of FIG. 16 in the image of the region which detects a shadow which concerns on one Embodiment of this invention. It is a figure for demonstrating how to obtain the determination value (darkness) for determining the presence or absence of a shadow which concerns on one Embodiment of this invention. It is a figure for demonstrating how to obtain the determination value (darkness) for determining the presence or absence of a shadow which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The authentication image acquisition device according to the present embodiment acquires an image used for authentication in the authentication system. The authentication system is attached to, for example, imprints of seals, signs, trademarks, logo marks, brand marks, identification marks printed on banknotes, marks made on three-dimensional objects by transfer paper, magnetic cards and IC cards. Marks for identification, etc., can be attached to the surface of thin pieces of paper, wood, cloth, resin, metal, etc., or three-dimensional objects, printed or drawn with ink such as pigments and dyes, and painted with paint. Includes objects that are subject to certification, such as flat objects or signs that are three-dimensional objects, to which a material that constitutes some color is fixed, such as being coated or molded from a resin containing a coloring material. Can be done.

In addition, the certification system is unique to the target extracted from image data taken under certain configuration conditions using a standard digital imaging device that does not require processing of the target to be certified and has a fixed configuration for the individual characteristics of the target. It can include a method for determining the identity of a target according to a principle regarding information, a unique information extraction method for extracting unique information from a scanned image, and a method for authenticating a target when necessary based on the extracted unique information.

The acquisition of the authentication image according to the present embodiment may be used when registering the authentication image, or may be used when acquiring the authentication image for collating with the registered image.

(First Embodiment)
In this embodiment, a pharmaceutical product is used as an example of an article to be certified. Further, in order to certify a drug, the label attached to the ampoule of the drug is used as an area for acquiring an image for authentication. In the image acquisition system for authentication, a template that serves as a reference for shooting is prepared in advance, and it is confirmed whether or not the template matches or is close to the template for each frame of the image captured (captured) by the camera. do. If it is determined that they match, imaging is automatically performed and the user is notified. The degree of matching is calculated as a comparison value, and when the comparison value is equal to or higher than a predetermined threshold value, it is stored in the memory as an image candidate for authentication.

FIG. 1 is a perspective view showing an external configuration of an image pickup device according to the present embodiment. The image pickup device 100 includes at least a camera unit 102, a camera holder / stand 104, and an ampoule rotation jig 106. The camera unit 102 is provided with a camera for photographing an ampoule supported by the ampoule rotation jig 106. The ampoule rotation jig 106 is fixed to the camera holder / stand 104, and the camera holder / stand 104 is formed so as to support the camera unit 102. Further, a handle formed so as to be grippable is provided on the upper portion of the camera holder / stand 104, and the user can hold the handle and carry the image pickup device 100.

2A is a perspective view of the external configuration of the image pickup device 100 in which the ampoule is installed, FIG. 2B is a side view seen from the direction of arrow A in FIG. 2A, and FIG. 2C is FIG. 2A. It is a side view seen from the arrow B direction. The ampoule 202 is inserted into the opening of the ampoule rotation jig 106. The user of the image pickup device 100 inserts the head of the ampoule 202 into the opening, pinches the body of the ampoule 202 with his fingers and moves it back and forth, or adjusts the image pickup position while rotating the ampoule 202 around its axis. do.

FIG. 3 is a diagram showing the configuration of the camera unit 102. A camera 306 composed of a CCD camera, a CMOS camera, or the like is provided on the back side of the substrate 302 arranged inside the camera unit 102. Further, a large number of LEDs 304 are arranged around the opening of the substrate, 16 of which are arranged side by side in the example shown in the figure, and are configured to illuminate the label of the ampoule installed near the opening 308. The housing of the camera unit 102 is formed in a taper shape from the position of the camera 306 toward the opening 308. The inside of this housing is preferably white. Further, by making fine irregularities on the inner wall of the housing like spray coating, the light emitted from the LED 304 is reflected as a whole, and the light passing through the opening is uniformly irradiated on the label.

FIG. 4 is a block diagram showing a functional configuration of the authentication image acquisition system according to the present embodiment. The authentication image acquisition system 400 is configured by connecting the image pickup device 100 and the PC406. The camera unit 102 of the image pickup device 100 executes a memory 405 that stores data such as captured images and a program for controlling the camera unit 102, a communication unit 404 for communicating with an external terminal, and the above program. It includes a control unit 402 that controls the entire camera unit 102. With this configuration, the lens 307 of the camera 306 whose imaging process is controlled by the control unit 402 is oriented to image the label of the ampoule arranged below the opening 308. The image taken by the camera 306 is stored in the memory 405 or transmitted to an external terminal through the communication unit 404.

The PC406 is an example of an external terminal, and functions as an authentication image acquisition device in the present embodiment. The PC 406 is composed of a processor 408 that executes a program to control the PC 406, a memory 410 that records various programs and data, a communication unit 412 for communicating with the image pickup device 100, a liquid crystal display for displaying an image, and the like. The display unit 414 is included. The operation according to the present embodiment is achieved by the processor 408 reading and executing the program recorded in the memory 410.

Next, with reference to the flowchart S500 of FIG. 5, a method of acquiring an authentication image executed by the image pickup device 100 and the PC406 according to the present embodiment will be described. First, as a premise of this method, the image of the template for comparison with the captured image is stored in advance in the memory 410 of the PC406. Further, an image storage threshold value T1 for comparing the degree of matching between the captured image and the template image and an image acquisition threshold value T2 are stored. The image storage threshold value T1 is used for determining to store the retained authentication image candidate as an authentication image. Further, the image acquisition threshold value T2 is used for determination for holding the captured image as an authentication image candidate.

In step S502, the image pickup device 100 captures one frame of the image and transmits it to the PC406 (S504). Next, the PC406 compares the captured image with the image of the template stored in the memory 410, and acquires the degree of matching of the images. As a method for evaluating the degree of agreement, for example, an algorithm for matching such as SSD (Sum of Squared Difference), SAD (Sum of Absolute Difference), and normalized cross-correlation can be used.

Next, in step S506, it is determined whether the calculated degree of matching exceeds the image storage threshold value T1. If it is determined in this determination process that the degree of matching is equal to or less than the image storage threshold value T1, the process proceeds to step S518, and it is determined whether or not the image held as the authentication image candidate is already stored in the memory 410. .. If there is a retained image, it means that the acquired matching degree once becomes equal to or higher than the image acquisition threshold T2 and then becomes equal to or lower than the image storage threshold T1. In this case, the retained image is saved in a file as an authentication image (S520), and the process is terminated. In this way, when the acquired matching degree becomes equal to or less than the image acquisition threshold T2 and then becomes equal to or less than the image storage threshold T1, the retained image is automatically saved as an authentication image in a file. Will be done.

If it is determined in step S506 that the degree of matching exceeds the image storage threshold T1, the process proceeds to step S508, and it is determined whether the degree of matching is equal to or greater than the image acquisition threshold T2. Here, T2> T1. If it is determined in step S508 that the degree of coincidence is less than the image acquisition threshold value T2, the process returns to step S502 again and captures the next frame. On the other hand, if it is determined in step S508 that the degree of coincidence is equal to or higher than the image acquisition threshold value T2, the process proceeds to step S510, and it is confirmed whether or not there is an image already held as an authentication image candidate in the memory 410. If there is no image in the memory 410, the process proceeds to step S512, and the captured image is held in the memory 410 as an image candidate for authentication. In this way, when the acquired matching degree is equal to or higher than the image acquisition threshold value T2, a process of automatically holding the captured image as an authentication image candidate in the memory 410 is performed. Then, the process returns to step S502 to capture the next frame.

When it is determined in step S510 that there is an image retained as an image candidate for authentication, the degree of matching between the captured image and the template image is compared with the degree of matching between the retained image and the template image. do. If the degree of matching between the captured image and the image of the template is greater than the degree of matching between the captured image and the image of the template, the process proceeds to step S516, and the image already held in the memory 410 is newly added. Overwrite with the captured image. If it is determined in step S514 that the degree of matching of the captured images is equal to or less than the degree of matching of the retained images, the process returns to step S502 without overwriting with the newly captured image.

Next, the method of acquiring the authentication image of the present embodiment will be described with reference to an example of the image displayed on the PC406.

FIG. 6 shows an example of a label affixed to the surface of an ampoule. Further, FIG. 7 shows an example of a template that is previously stored in the memory 410 and compared with a predetermined area of the label. When the image captured in the predetermined area of FIG. 6 and the template match, or when the template is in a state close to matching, one frame of the image captured by the camera is placed on the memory 410 as an image candidate for authentication. Hold.

FIG. 8 shows an example of the image pickup device 100 and the captured image by the device. As shown in FIG. 8A, the camera holder / stand 104 of the image pickup device 100 is provided with a slit 802. As shown in FIG. 8B, from the slit 802, only the portion of the label affixed to the ampoule 202 that is in focus can be seen by the camera. The slit 820 makes it easier for the user to roughly align the position. In this way, the label of the ampoule 202 is captured only in the image of the portion of the slit 802.

FIG. 9 shows an outline of the operation of photographing the label while adjusting the position of the ampoule. The ampoule rotation state shown in the figure schematically shows the ampoule 202 and the camera 306 as seen from the arrow A in FIG. Here, the label 902 attached to the ampoule 202 is shown away from the ampoule 202 in order to explain the positional relationship.

The PC 406 compares the image captured by the camera (camera capture) with the template for each frame, and when the degree of matching is equal to or higher than the threshold value, the captured image is held in the memory 410 as an image candidate for authentication. If the degree of matching exceeds the previously saved one during the rotation of the ampoule, the image already stored in the memory 410 is overwritten and saved. For operations 1, 2 and 4, label 902 is not located directly under camera 306 and the captured image does not match the template. In this case, the PC406 does not hold the image. On the other hand, in the case of operation 3, it corresponds to the case where the degree of matching between the captured image and the template image is equal to or higher than a predetermined threshold value, and the captured image is held in the memory 410 as an authentication image candidate. Here, when the image whose matching degree is equal to or higher than the threshold value is overwritten in the memory 410, it may be notified through the PC406 that the image is overwritten. This notification may be a message displayed by the display unit 414, or may be a change in the display mode such as blinking an image.

(Second Embodiment)
Next, a second embodiment of the present invention will be described, which detects that the object to be imaged has no movement (stationary state) and prevents blurring of the subject. In the present embodiment, in order to prevent blurring of the subject to be authenticated, it is determined whether or not the subject is moving by using three consecutive frames of images.

FIG. 10 is a diagram showing an operation according to the present embodiment. First, in the memory 410 of the PC 406, in addition to the image storage threshold T1 and the image acquisition threshold T2, the movement allowance threshold T3 for comparison with the mobility of the image is stored. The movement allowable threshold value T3 is used for determination for holding the captured image as an image candidate for authentication. When it is determined that the degree of matching between the captured image and the template exceeds the image acquisition threshold value T2, the following processing is performed on the continuously captured images. The PC406 compares the captured first frame image and the second frame image, and calculates the moving distance of the image. Next, the moving distance is calculated for the image in the second frame and the image in the third frame. Then, when the two calculated mobilities are both equal to or less than the movement allowable threshold T3 acquired from the memory 410, it is determined that there is no blurring of the subject, and the captured image in the second frame is used as an image candidate for authentication. It is held in the memory 410. If one of the two calculated mobilities exceeds the movement tolerance threshold T3, the captured image is not retained.

After that, when the matching degree of the images of adjacent frames in time is equal to or less than the image storage threshold value T1 while holding the authentication image candidate, the held image is used as the authentication image file. Save in memory 410. In this way, when it is determined at least twice in succession that the image is in a stationary state, a process of holding the captured second and subsequent images as authentication image candidates is performed.

Specifically, the processing of this embodiment is performed as follows.

1. 1. The user of the image pickup device 100 inserts the ampoule 202 into the camera holder / stand 104.

2. 2. Next, hold the body of the ampoule with your hand and rotate it to roughly align it. When the part of the label suitable for capturing the authentication image comes to the front of the lens of the camera, the label is automatically held in the memory 410 as an image candidate for authentication.

3. 3. After that, when the authentication image candidate is saved in the file as the authentication image, the PC406 notifies the user that the authentication image can be saved in the file. For example, the PC406 displays a message on the display unit 414 indicating that the authentication image has been captured. Alternatively, this notification may be a change in the display mode such as blinking the image displayed by the display unit 414.

4. The user pulls out the ampoule from the camera holder / stand 104.

5. The PC406 authenticates the ampoule based on the received authentication image.

(Third Embodiment)
Next, with reference to FIG. 11, a third embodiment of the present invention for displaying a guide image for arranging a subject at an appropriate position in a PC of an authentication image acquisition system will be described.

FIG. 11 shows an example of an image captured by the image pickup device 100. When the template is created according to the image shown in FIG. 11 (a), the captured image as shown in FIG. 11 (b) is excluded from the authentication image candidates because it is out of alignment with the template. However, it is difficult to adjust the position while manually rotating the ampoule so that the appropriate image shown in FIG. 11 (a) is captured. Therefore, in the present embodiment, the guide image is superimposed on the captured image and displayed on the display unit 414 of the PC406 to facilitate the position adjustment.

FIG. 12 shows an example of a screen displayed on the display unit 414 of the PC406 according to the present embodiment. As shown in the figure, the guide image is displayed at a fixed position on the screen. The PC406 continuously receives the frame images captured by the image pickup device 100, and the moving image of the frame image 1406 is displayed on the display unit 414. A guide image consisting of the frame line 1204 of the template image is superimposed and displayed on the captured moving image. The guide image may include a frame line 1202 indicating the boundary of the slit of the camera holder / stand 104. In this way, the user can move the ampoule while looking at the screen and position the contour of the captured label image so as to overlap the guide image. As a result, the acquisition of the authentication image can be performed quickly and easily.

FIG. 13 shows an example of a screen displayed on the display unit 414 by a program that executes the authentication image acquisition method according to the present embodiment on the PC406. As shown in the figure, the template image 1302, the captured image 1304, and the authentication image 1306 are displayed side by side on the screen. Here, the captured image 1304 displayed in the center includes the guide images 1308, 1310, and 1312.

(Fourth Embodiment)
Next, with reference to the flowchart S500'in FIG. 14, the operation executed by the authentication image acquisition system 400 according to the fourth embodiment of the present invention will be described.

The flowchart shown in FIG. 14 includes a notification process to the user by the PC406 in the flowchart of FIG. First, before step S502, the PC406 causes the display unit 414 to display the guide image (step S501). In step S502, the image pickup device 100 captures one frame of the image and transmits it to the PC406. The PC406 displays the received image (step S503).

Next, when it is determined in step S506 that the calculated degree of matching exceeds the image storage threshold value T1, the PC406 notifies the display unit 414 that the position of the ampoule is close to an appropriate position (step S507). ). This process may be performed when it is determined in step S508 that the degree of coincidence exceeds the image acquisition threshold value T2. For example, the color of the guide image may be changed or blinked.

Further, in step S512, when the captured image is held in the memory 405 as an image candidate for authentication, or in step S516, when the image already held in the memory 405 is overwritten with the newly captured image. The PC 406 may notify that the authentication image candidate has been acquired (step S517). In this notification process, for example, an image in which the camera shutter opens and closes may be displayed on the display unit 414 on the entire screen. When displaying the image of the camera shutter, the camera shutter sound may be output.

(Fifth Embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 15 to 18.

One of the factors that affect the authentication accuracy is the distance from the tip of the camera lens to the subject, that is, the working distance. In order to remove the influence of this change in working distance, the image pickup device 100 is designed so that the working distance is always constant. However, in the case of curved products such as ampoules, even if the subject (shooting location) is placed in the center of the viewfinder of the camera, it will not be in focus as the distance from the camera increases.

FIG. 15 is a diagram for explaining the position of a subject photographed by the image pickup device 100. The ampoule 202 inserted in the ampoule rotation jig 106 may move in the axial direction or the circumferential direction of the ampoule, or may move so as to change the distance from the camera as shown by the arrow in the figure. Then, an appropriate authentication image cannot be obtained when the subject is submerged, that is, when the subject moves away from the camera along the Z-axis direction. In order to authenticate accurately on a curved surface, it is necessary to always shoot the subject at the same position.

In the case of the example shown in FIG. 15, since the LED light is emitted from the camera side toward the label in the camera unit 102, the shadow of the edge of the opening 308 of the housing of the camera unit 102 is reflected on the label. Include. Therefore, in the present embodiment, a shadow reflected in the captured image is used in order to detect a state in which the subject is sunk.

FIG. 16 shows an example of an image of the ampoule label being captured. As shown in FIGS. 16A and 16B, the camera captures up to the edge of the opening 308 of the housing of the camera unit. In the present embodiment, the areas included in the circles in FIGS. 16A and 16B are used in order to detect the shadow reflected on the label. The area includes a boundary portion between the edge of the opening 308 of the housing and the label. In FIG. 16A, the ampoule is arranged close to the opening of the housing of the camera unit 102, and no shadow is shown in the image. On the other hand, in FIG. 16B, the ampoule is in a depressed state, moves from an appropriate position in the Z-axis direction, and is separated from the camera unit 102. Therefore, a gap is formed between the ampoule and the opening 308 of the housing of the camera unit 102, and the shadow of the opening 308 is reflected in the image of the label. As a result, in the image of the label, the brightness of the circled portion is reduced. The memory 410 of the PC406 stores a darkness threshold value T4 to be compared with the brightness of this image. The darkness threshold value T4 is used for determination for prohibiting holding the captured image as an authentication image candidate.

The image pickup device 100 obtains a value (darkness) for determining "darkness" from the difference in brightness between the brightness of the opening 308 and the area marked with a circle, and if the darkness is equal to or higher than the darkness threshold value T4, a shadow is obtained. Judge that there is. Then, when it is determined that there is a shadow, the image pickup device 100 prohibits the holding of the authentication image candidate. In this way, when the darkness of a predetermined region in the captured image is equal to or higher than the darkness threshold value T4, a process for prohibiting holding the captured image as an authentication image candidate is performed.

Here, the image pickup device 100 transmits a signal indicating that the holding of the authentication image is prohibited to the PC406. The PC406 notifies the user that the authentication image cannot be retained in response to the reception of this signal. This notification may be, for example, changing the display color of the guide image or displaying a message to adjust the position of the ampoule in the Z-axis direction.

FIG. 17 is a graph showing the brightness with respect to the x-coordinate (horizontal direction) of FIG. 16 in the image of the region for detecting the shadow. The value on the Y-axis is the average brightness of the image at a specific x-coordinate. As shown in the figure, there is a difference in the average brightness between the case with shadow and the case without shadow. Therefore, by using this difference in brightness, it is possible to detect the state in which the ampol is submerged.

FIG. 18 is a diagram showing an example of a region for determining the presence or absence of a shadow. Brightness is acquired at the width of the inner wall portion of the housing of the camera unit (camera frame brightness determination width), and this brightness is used as a reference.

FIG. 19 is a diagram showing how to obtain the darkness using the graph shown in FIG. As described above, the reference brightness obtained in the camera frame brightness determination width is shown as a straight line in the horizontal direction in the figure. On the other hand, the curve drawn below the reference indicates the brightness of the captured image with respect to the position on the x-coordinate. The average of this criterion and the captured image and the lightness difference over the x-coordinate can be used as the darkness. The PC406 prohibits the holding of the authentication image candidate when the darkness is equal to or higher than the predetermined darkness threshold value T4.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and other modifications and modifications deviate from the scope of the present invention defined by the claims. Note that it can be done by one of ordinary skill in the art without.

100 Imaging device 102 Camera unit 104 Camera holder and stand 106 Ampoule rotation jig 202 Ampoule 302 Board 304 LED
306 CCD camera 308 Aperture 400 Authentication image acquisition system 402 Control unit 404 Communication unit 405 Memory 406 PC
408 Processor 410 Memory 412 Communication unit 414 Display unit

Claims (15)

It is an image acquisition device for authentication.
A storage means that stores a template that defines the image capture position of the authentication image, and
A comparison means for obtaining a degree of agreement by comparing an image of a predetermined area of an object captured by an imaging device with a template stored in the storage means.
When the acquired degree of matching is equal to or higher than the first threshold value, the holding means for holding the captured image as an authentication image candidate in the storage means, and the holding means.
When the acquired matching degree becomes equal to or higher than the first threshold value and then becomes equal to or lower than the second threshold value, a file saving means for saving the image held by the holding means in a file as an authentication image, and a file saving means. An image acquisition device for authentication, which is characterized by being equipped with. It is an image acquisition device for authentication.
A storage means that stores a template that defines the image capture position of the authentication image, and
A comparison means for obtaining a degree of agreement by comparing an image of a predetermined area of an object captured by an imaging device with a template stored in the storage means.
When the acquired degree of matching is equal to or higher than the first threshold value, a holding means for holding the captured image as an authentication image candidate in the storage means is provided.
The holding means is
When the degree of matching obtained by the comparison means is equal to or higher than the first threshold value,
A determination means for determining the stationary state of the image based on the movement distance and the degree of coincidence of two temporally continuous images of the captured images.
An authentication image acquisition device comprising holding the captured second and subsequent images as authentication image candidates when it is determined by the determination means to be in a stationary state at least twice in succession. The claim is characterized in that when the acquired matching degree exceeds the matching degree of the immediately held image, the holding means overwrites the authentication image held immediately before with the newly captured image. The authentication image acquisition device according to 1 or 2 . The holding means is characterized in that when the darkness of a predetermined region in the captured image is equal to or greater than a third threshold value, the captured image is prohibited from being retained as an image candidate for authentication. The authentication image acquisition device according to any one of claims 1 to 3 . The authentication image acquisition device according to claim 1 or 2 , further comprising a display means for displaying the captured image. The authentication image according to claim 5 , wherein the display means further includes a control means for displaying a guide image for positioning the captured image on the captured image. Acquisition device. The authentication image according to claim 5 or 6 , wherein the display means changes the displayed image in the first aspect when the acquired degree of matching is equal to or higher than the first threshold value. Acquisition device. The display means is characterized in that when the acquired degree of coincidence becomes equal to or greater than the first threshold value and then becomes equal to or less than a second threshold value, the displayed image is changed in the second aspect. Item 5. The image acquisition device for authentication according to any one of Items 5 to 7 . The display means is characterized in that, when the darkness of a predetermined area in the captured image is equal to or greater than a third threshold value, the displayed image is changed in the third aspect. An image acquisition device for authentication described in any of the above. It is an image acquisition system for authentication.
An imaging device that captures a predetermined area of an object, and
It is an image acquisition device for authentication.
A storage means that stores a template that defines the image capture position of the authentication image, and
A comparison means for obtaining a degree of agreement by comparing an image of a predetermined area of an object captured by an imaging device with a template stored in the storage means.
When the acquired degree of matching is equal to or higher than the first threshold value, the holding means for holding the captured image as an authentication image candidate in the storage means, and the holding means.
When the acquired matching degree becomes equal to or higher than the first threshold value and then becomes equal to or lower than the second threshold value, a file saving means for saving the image held by the holding means in a file as an authentication image, and a file saving means. Image acquisition device for authentication , including
An image acquisition system for authentication, which is characterized by being equipped with. It is an image acquisition system for authentication.
An imaging device that captures a predetermined area of an object, and
It is an image acquisition device for authentication.
A storage means that stores a template that defines the image capture position of the authentication image, and
A comparison means for obtaining a degree of agreement by comparing an image of a predetermined area of an object captured by an imaging device with a template stored in the storage means.
When the acquired matching degree is equal to or higher than the first threshold value, a holding means for holding the captured image as an authentication image candidate in the storage means, and an authentication image acquisition device including the holding means are provided.
The holding means is
When the degree of matching obtained by the comparison means is equal to or higher than the first threshold value,
A determination means for determining the stationary state of the image based on the movement distance and the degree of coincidence of two temporally continuous images in the captured image is provided.
When the determination means determines that the image is in a stationary state at least twice in succession, the captured second and subsequent images are retained as authentication image candidates.
An image acquisition system for authentication, which is characterized by this. A method of acquiring authentication images performed by a computer.
A step of storing a template for defining an imaging position of an authentication image in the storage unit of the computer, and a step of storing the template.
A step of comparing an image of a predetermined area of an object captured by an imaging device with a template stored in the storage unit to obtain a degree of agreement, and
When the acquired degree of matching is equal to or higher than the first threshold value, the step of holding the captured image as an authentication image candidate in the storage unit, and the step of holding the captured image in the storage unit .
When the acquired matching degree becomes equal to or greater than the first threshold value and then becomes equal to or lower than the second threshold value, the step of saving the image held in the holding step as an authentication image in a file is performed. A method of acquiring an image for authentication, which is characterized by being prepared. A method of acquiring authentication images performed by a computer.
A step of storing a template for defining an imaging position of an authentication image in the storage unit of the computer, and a step of storing the template.
A step of comparing an image of a predetermined area of an object captured by an imaging device with a template stored in the storage unit to obtain a degree of agreement, and
When the acquired degree of matching is equal to or higher than the first threshold value, the step of holding the captured image as an authentication image candidate in the storage unit is included.
The holding step is
When the acquired degree of matching is equal to or higher than the first threshold value,
A step of determining the stationary state of the image based on the movement distance and the degree of coincidence of two temporally continuous images in the captured image is included.
A method for acquiring an authentication image, which comprises holding the captured second and subsequent images as authentication image candidates when it is determined at least twice in succession by the determination step. .. A computer program that causes a computer to function as an authentication image acquisition device according to any one of claims 1 to 9 . A computer-readable recording medium on which a computer program that causes a computer to function as an authentication image acquisition device according to any one of claims 1 to 9 is recorded.

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