KR20130007346A - System for comparison processing of moving pictures - Google Patents

System for comparison processing of moving pictures Download PDF

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KR20130007346A
KR20130007346A KR1020110065435A KR20110065435A KR20130007346A KR 20130007346 A KR20130007346 A KR 20130007346A KR 1020110065435 A KR1020110065435 A KR 1020110065435A KR 20110065435 A KR20110065435 A KR 20110065435A KR 20130007346 A KR20130007346 A KR 20130007346A
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image
comparison
target object
processing apparatus
images
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KR101260862B1 (en
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김성읍
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김성읍
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31—User authentication
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/08—Payment architectures
    • G06Q20/14—Payment architectures specially adapted for billing systems
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q30/00—Commerce
    • G06Q30/06—Buying, selling or leasing transactions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/20—Analysis of motion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/30—Computing systems specially adapted for manufacturing

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Abstract

The present invention relates to an image comparison system. The image comparison system according to an embodiment of the present invention includes an image acquisition unit for acquiring an image of a target object moving in a preset pattern, and dividing the image into preset image sections. An image processing unit including an image processing unit inserting image section information into a header of an image frame corresponding to each image section, and the image section information of the images processed by the image processing apparatus at different times input from an authenticated member. Generate a comparison image synchronized with the user based on the; and if the comparison amount is transferred from the member's financial account when the comparison image is requested from the member, the comparison image is transmitted to the member through a video streaming or a download link. It includes a comparison image providing server to provide. Such an image comparison system according to the present invention can insert a synchronization signal into images photographing the operation of the same pattern to synchronize and compare images more easily.

Description

Image comparison system {SYSTEM FOR COMPARISON PROCESSING OF MOVING PICTURES}

The present invention relates to an image comparison system, and more particularly, to a technique for comparing and processing images photographed at different viewpoints of a target object moving in the same pattern.

Recently, with the development of high speed video recording technology, it is possible to analyze the athlete's movement more precisely in athletics. For example, in a baseball game, the player's posture is corrected by comparing the pitcher's throwing ball to the catcher in a wind-up position or by repeatedly shooting and swinging the batter hitting the pitcher's ball in the plate. It is widely used to In addition, if you swing in a stationary position such as golf, it is possible to shoot a swing video and compare it with the swinging motion of a famous professional player.

However, when comparing images photographing the operation of the same pattern, such as the golf swing operation, there is a problem that it is difficult to synchronize the image of the entire pattern because the same pattern operation is photographed at different times. In this case, even when trying to compare the images for posture correction, it is difficult to determine which posture of the movement is disturbed due to temporal mismatch. In addition, the user has an economic burden of purchasing expensive software in order to compare and analyze images captured at different time points. Therefore, there is a need for a technique for more easily synchronizing images photographing motions of the same pattern photographed at different viewpoints.

The technical problem to be achieved by the present invention, by inserting a synchronization signal to the images taken of the operation of the same pattern taken from different viewpoints to more easily synchronize the image to provide to the authenticated user, payment of the synchronized image It is to provide a video comparison system that generates revenue by providing the completed authenticated members through the Internet.

An image comparison system according to an embodiment of the present invention includes an image acquisition unit for acquiring an image of a target object moving in a preset pattern, and dividing the image into preset image sections, and a header of an image frame corresponding to each image section. An image processing unit including an image processing unit inserting the image section information into the image processing unit, and generating a comparison image by synchronizing the images processed by the image processing apparatus at different times input from an authenticated member based on the image section information; And a comparison image providing server providing the comparison image to the member through a video streaming or a download link when a predetermined amount is transferred from the member's financial account when the comparison image is requested from the member.

The image acquisition unit may be generated at a predetermined point of the pattern, based on a trigger signal set as a sensor attached to the target object or a preset sound signal generated when the target object moves in the pattern. The image of the target object may be stored at preset time intervals before and after the trigger signal is generated.

The image processing unit may include a background extracting unit extracting a background image of the image, a luminance analyzer analyzing the luminance difference of the background image generated while the target object moves in the pattern, for each of the image sections, and the background. It may include an information insertion unit for inserting the image section information in the header of the image frame in which the luminance difference of the image occurs.

The image providing server may further include an authentication unit for processing member authentication, an image input unit for receiving images processed by the image processing apparatus at different times input from an authenticated member, and an image input from an existing image input unit. A member image DB for storing the image, a comparison image generator for generating a comparison image by synchronizing the images stored in the member image DB based on the image section information, a comparison image DB for storing the generated comparison image, and a fusion server It may include a payment processing unit for checking whether a predetermined amount from the member's financial account is transferred from, and if the transfer is confirmed to provide the member with a comparison image stored in the comparison image DB.

In addition, when the money transfer information of the member is confirmed from the financial server, an amount of money that is allocated at a predetermined rate may be transferred from the financial server to the financial account of the image processing apparatus and the image providing server.

Such an image comparison system according to the present invention can insert a synchronization signal into images photographing the operation of the same pattern to synchronize and compare images more easily. In addition, since the synchronization signal can be detected and compared with a plurality of images without installing a separate software for synchronizing the images on the PC, it is possible to reduce the economic burden on the user. In addition, by providing the synchronized image to the authenticated member who has completed payment through the Internet, it is possible to generate revenue of operators operating the image comparison system.

1 is a block diagram of an image comparison system according to an embodiment of the present invention;
2 is a flowchart illustrating an image processing method according to FIG. 1;
3 is a flowchart illustrating a method of generating a comparison image according to FIG. 1;
4 is an exemplary diagram for describing an implementation of the image comparison system according to FIG. 1 in the form of a kiosk;
5 is an exemplary diagram for describing setting a range of an image to be stored using a trigger signal in the image acquisition unit according to FIG. 1;
6A and 6B are exemplary diagrams for describing dividing an image section by the image processor of FIG. 1;
FIG. 7 is an exemplary diagram for describing generating a comparison image by the comparison image generator of FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms used are terms selected in consideration of the functions in the embodiments, and the meaning of the terms may vary depending on the user, the intention or the precedent of the operator, and the like. Therefore, the meaning of the terms used in the following embodiments is defined according to the definition when specifically defined in this specification, and unless otherwise defined, it should be interpreted in a sense generally recognized by those skilled in the art.

1 is a configuration diagram of an image comparison system according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining an image processing method according to FIG. 1, and FIG. 3 is for explaining a comparison image generation method according to FIG. 1. It is a flow chart.

The image comparison system 100 of the present invention includes an image processing apparatus 110 and a comparison image providing server 130. In addition, the image processing apparatus 110 may include an image acquisition unit 111 and an image processing unit 112, and the image processing unit 112 may include a background extractor 113, a luminance analyzer 114, and an information insertion unit 115. ). The image acquirer 111 acquires an image of a target object moving in a preset pattern (S200). For example, the image acquisition unit 111 is a high-speed camera module, it is possible to obtain an image of 50 to 100 scenes or more per second by the intermittent shooting method, the rotating prism method, the rotating drum method, the rotating reflector method, It is not necessarily limited in this manner. The target object included in the image acquired by the image acquirer 111 includes a person or an object, and the target object is moved by an operation of a pattern preset by a user. For example, it is preferable to photograph a motion showing a certain pattern in the movement, such as a motion of a batter swinging a baseball player or a golf player swinging a baseball player.

In addition, the image acquisition unit 111 may acquire an image from a plurality of cameras equipped with a motion sensor. For example, an image of the front, rear, side, and top of the target object is input to the image acquisition unit 111 while the target object is moving. In addition, a sensor may be attached to a target object to detect a movement.

In addition, the image acquisition unit 111 may display an image of the target object at a predetermined time interval before and after the occurrence of the trigger signal based on a trigger signal generated at a predetermined point among the movement patterns of the target object (not shown). ). In this case, the trigger signal is set to a preset sound signal generated when a sensor or a target object attached to the trigger generator or the target object moves in a pattern. The trigger signal is generated outside the image processing apparatus 110. For example, in the case of a golf swing, a trigger may occur at a moment when a target object impacts a golf ball. In addition, the sound generated during impact can be detected by the acoustic sensor to generate a trigger signal.

When the trigger signal is detected, the image acquisition unit 111 stores the captured images before and after the trigger signal in the image DB at predetermined time intervals. In this case, the length of the stored image may be set differently according to the user's setting. For example, when the target object makes a golf swing, when the trigger occurrence time is set as the impact moment, the time from the address to the impact and the finish after the impact By storing the time up to), the moving image of the target object photographed during the time from the address to the finish is stored in the image DB. Accordingly, the length of the video can be made constant. The image acquirer 111 outputs the image stored in the image DB to the image processor 112.

Next, the background extractor 113 of the image processor 112 extracts a background image excluding the target object in the image (S210). In this case, the extracted background may be set differently by user's setting. The background image is hardly changed while the target object moves in the patterned image in a preset pattern motion. Therefore, the background image serves as a criterion for determining a change in movement of the target object. The background extractor 113 outputs the extracted background image to the luminance analyzer 114.

Next, the luminance analyzer 114 analyzes the luminance change of the background image generated when the target object moves in the image input from the background extractor 113 for each preset image section (S220). For example, in the case of a golf swing image, the position of the golf club is changed as the target object makes a golf swing. As the golf club rotates, the luminance of the surrounding background image is changed. The luminance analyzer 114 analyzes a portion of the background image including each image section in which the luminance change occurs, and outputs the information to the information inserter 115.

Next, the information insertion unit 115 inserts the image section information into the header of the image frame in which the luminance difference of the background image occurs using the luminance change information input from the luminance analyzer 114 (S230). An image frame of a portion of the image in which the luminance of the background is changed is an image corresponding to the same image section. The information insertion unit 115 inserts image section information into each image frame. The image section information includes information on an image section to which each frame belongs and a frame counter number. In addition, when there are several establishments using the image processing apparatus 110, a device code may be received from a user who operates the image comparison system 100, and the corresponding code information may be inserted into the image. The device code information may be used later to synchronize the images in the image providing server 130, or check the source of the image.

The image processing apparatus 110 according to an embodiment of the present invention further includes an authentication unit 116 and a payment processing unit 117. The authenticator 116 is a connection interface through which the user accesses the image processing apparatus 110 through the user terminal 120 to process member authentication. The user may access the image processing apparatus 110 and obtain an image in which segment information is inserted into an image of a dynamically moving target object. When the authenticated member wants to receive the image processing service, the payment processor 117 determines whether the predetermined amount is transferred to the financial account of the image processing apparatus 110 through the financial server 140 and provides the image processing service. Do it.

On the other hand, the image processing apparatus 110 of the present invention may be implemented as a smartphone, a notebook, a tablet PC, etc. equipped with a camera module. In addition, the image processing algorithm in the image processing unit 112 may be provided as an application and installed in the user's portable terminal device. For example, a user pays a predetermined amount of money and downloads and installs an application provided by the image processing apparatus 110 on his smart phone in an Internet market, and executes the corresponding application to obtain an image using a camera module. The image processing apparatus 110 may transmit the data to the image processing apparatus 110 to store and manage the data, and download the image when necessary.

Meanwhile, the comparison image providing server 130 includes an authentication unit 131, an image input unit 132, a comparison image generation unit 134, and a payment processing unit 136. The comparison image providing server 130 may receive an image processed by the image processing apparatus 110 from the user terminal 120 or may receive an image processed directly from the image processing apparatus 110. In addition, the image processing apparatus 110 and the comparison image providing server 130 may be configured as one server according to a user's setting.

The authentication unit 131 accesses the comparison image providing server 130 through the user terminal 120 and processes member authentication through the member information input through the access interface (S300). Next, the image input unit 132 receives an image input by the authenticated member through the authentication unit 131 and stores it in the member image DB 133 (S310). In this case, the image input unit 132 may directly receive an image from the image processing apparatus 110 or may receive an image stored in the user terminal 120. The input image is stored in the member image DB 133 corresponding to the member information.

Next, the comparison image generator 134 receives images of target objects photographed at different times, analyzes image section information included in image frames of images to be compared, and synchronizes the images to generate the comparison images. The image is stored in the comparison image DB 135 (S320). The image input to the comparison image generator 134 is an image having the same pattern of motion, and includes image section information in a header of each image frame.

In addition, the comparison image generator 134 selects an image input in the same pattern as the reference image and synchronizes it with the reference image when the reference image as the reference image is set. In this case, the video section information of the frame header of the video synchronized with the reference video is preferably set in the same format. For example, in the case of a golf swing image, an address, a back swing, a top of the swing, and a down swing are used to compare a golfer's swing motion with a golfer's video. The swing posture of the professional golfer and the public may be compared using information of an image section divided into down swing, impact, follow throw, and finish postures.

In addition, the comparison image generator 134 may sequentially compare images input from the same target object. For example, a person practicing golf alone can record his golf swing posture at different times and compare them. Thus, the user can compare his or her posture that changes according to a specific point in time.

Next, when there is a request for a comparison image from the authenticated member, the payment processing unit 136 provides a comparison image to the member through a video streaming or a download link when a predetermined amount is transferred from the member's financial account (S330). . The comparison image providing server 130 is connected to the financial server 140 that processes the financial settlement, and the user terminal 120 accesses the financial server 140 to request the financial settlement. When the member transfers a predetermined amount, the payment processing unit 136 streams the comparison video in real time on the web through a video providing interface to provide the member. In addition, the payment processing unit 136 provides the member with a download link address, and the member may access the corresponding link address and download the comparison image that he / she wants.

On the other hand, the image comparison system 100 according to an embodiment of the present invention, if the user operating the image processing device 110 and the user operating the image providing server 130 is different, the overall image comparison system 100 When the member is managed and the funds transfer information of the member is confirmed from the financial server 140, the amount transferred by the member from the financial server 140 to the financial account of the image processing apparatus 110 and the image providing server 130 is previously displayed. It can be set to transfer at a set rate. Accordingly, a user operating an image processing apparatus 110 for acquiring and processing an image of a target object by installing a high-speed camera and an image providing server 130 for computer processing the image processed by the image processing apparatus 110 are provided. In the case of different operating users, revenue for the users operating each server can be guaranteed.

4 is an exemplary diagram for describing an implementation of the image comparison system according to FIG. 1 in the form of a kiosk.

Referring to FIG. 4, the image comparison system 100 of the present invention may be implemented using a mobile phone, a notebook computer, a tablet PC, a kiosk, and the like including a high speed camera. In the case of FIG. 4, the image comparison system 100 is implemented in the form of a kiosk. The image comparison system 100 implemented as a kiosk photographs the pattern movement of the target object through the high speed camera module and processes the authentication through information input from the user through the display. In addition, the image comparison system 100 may be provided with an RF reader to scan the barcode information of the membership card provided to the member to process member authentication. In addition, when the payment processing is completed by the user with a card reader or a banknote inserter to generate the photographed images as a comparison image and output on the display. In addition, the image comparison system 100 may transmit a file to a USB or a web hard by which a user inserts a comparison image having a USB port or connected to the Internet.

FIG. 5 is an exemplary diagram for describing setting a range of an image to be stored using a trigger signal in the image acquisition unit according to FIG. 1.

Referring to FIG. 5, when a target object moves in a golf swing pattern, for example, a trigger signal may be set to occur at an impact moment. When a trigger occurs, an image photographed for a time equal to Ta, which is a preset time before the trigger generation, and Tb, which is a preset time after the trigger generation, is stored in the image acquisition unit 111. The time of Ta and Tb can be changed by user's setting. To generate a trigger, the sensor may be set to generate a trigger as soon as the golf ball leaves the set position.

In addition, a sound sensor may be installed around the golf ball, and a trigger signal may be generated by detecting a sound generated when the target object hits the golf ball with a golf club. By matching the time lengths of the images to be analyzed using the trigger signal, the plurality of images can be easily compared.

6A and 6B are exemplary diagrams for describing segmentation of an image section in the image processor of FIG. 1.

Referring to FIG. 6A, when the target object makes a golf swing, the image acquirer 111 may divide the image section into seven operations, which are the basic operations of golf described above, and may further segment the image section. have. In this case, the image acquisition unit 111 may assume the swing trajectory of the golf club as a circle in order to divide the image section, and may divide it into several arcs. After dividing the image section, the background extractor 113 extracts the background image from the image as shown in FIG. 6B. Referring to FIG. 4B, the background image may be set as a path in which a golf club moves as an image that does not include a target object. The luminance analyzer 114 may determine that the luminance of the zone set as each image setting reference zone is changed and set the frame of the corresponding image to have the same image section. These zones are used to detect the motion of the target object and to segment the image section in which each motion occurs.

For example, in an image in which a target object poses a back swing in a golf swing, a change in luminance of an image section 1 is detected due to a golf club. Therefore, the video section information and the frame counter number corresponding to the video section ① are set in the header of the video frame in which the brightness of the video section ① is changed. Subsequently, when frame number ① of the existing image is detected by analyzing the frame header of the image photographed at different time points, the two images are compared with each other by synchronizing with the image photographed in the image section ① of the existing image. Can be. Therefore, the user can analyze the swing of his golf swing by comparing the images swinged in the same pattern without the separate image processing for the captured image.

FIG. 7 is an exemplary diagram for describing generating a comparison image by the comparison image generator of FIG. 1.

Referring to FIG. 7, the comparison image generator 134 may synchronize and reproduce a plurality of images. When the reference image exists, the comparison image generator 134 may provide an image compared to the reference image with respect to an image input later. When the reference image does not exist, the comparison image generator 134 may sequentially input the images. A comparison image may be generated. In addition, a comparison image may be generated with respect to images arbitrarily selected by a user's setting. In the method of providing a comparison image by the comparison image generating unit 134, a plurality of images may be set to contrast still images for each image frame, and the plurality of images are merged to display a separate identification mark for a portion that does not match. It is also possible to set.

For example, in FIG. 7, when image 1 is a reference image, the image 2 captured at a different point in time from the image 1 is synchronized with the image 1 to compare the images at the points where the image sections coincide with each other. The difference is marked with a marker. Therefore, the user can easily grasp not only the difference in the movement for the pattern movement of his own but also the difference in the movement for the pattern movement with the professional athlete.

The image comparison system 100 according to the present invention can insert a synchronization signal into images photographing the operation of the same pattern to synchronize and compare images more easily. In addition, since the synchronization signal can be detected and compared with a plurality of images without installing a separate software for synchronizing the images on the PC, it is possible to reduce the economic burden on the user.

Meanwhile, embodiments of the present invention can be implemented by computer readable codes on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device and the like, and also a carrier wave (for example, transmission via the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. And functional programs, codes, and code segments for implementing the present invention can be easily deduced by programmers skilled in the art to which the present invention pertains.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, Therefore, the present invention should be construed as a description of the claims which are intended to cover obvious variations that can be derived from the described embodiments.

100: image comparison system 110: image processing device
111: image acquisition unit 112: image processing unit
113: background extraction unit 114: luminance analyzer
115: information insertion unit 116: authentication unit
117: payment processing unit 120: user terminal
130: comparison image providing server 131: authentication unit
132: video input unit 133: member video DB
134: comparison image generation unit 135: comparison image DB
136: payment processing unit 140: financial server

Claims (5)

An image acquisition unit for acquiring an image of a target object moving in a preset pattern, and an image processing unit for dividing the image into preset image sections and inserting image section information into a header of an image frame corresponding to each image section. Image processing apparatus; And
Generate a comparison image by synchronizing images processed by the image processing apparatus based on the image section information at different times input from an authenticated member, and requesting the comparison image from the member. And a comparison image providing server which provides the comparison image to the member through a video streaming or a download link when a predetermined amount of money is transferred from the member. The method of claim 1, wherein the image acquisition unit,
Generated at a predetermined point of the pattern, based on a trigger signal set as a sensor attached to the target object or a preset sound signal generated when the target object moves in the pattern, before and after the occurrence of the trigger signal. And an image comparison system storing the image of the target object at a preset time interval. The image processing apparatus of claim 1, wherein the image processor comprises:
A background extractor extracting a background image of the image, a luminance analyzer analyzing the luminance difference of the background image generated by moving the target object in the pattern for each image section, and an image frame in which the luminance difference of the background image occurs And an image insertion unit for inserting the image section information into a header of the image processing unit. The method of claim 1, wherein the image providing server,
An authentication unit for processing member authentication;
An image input unit configured to receive images processed by the image processing apparatus at different times input from an authenticated member;
Member image DB for storing the image input from the image input unit;
A comparison image generator configured to generate a comparison image by synchronizing the images stored in the member image DB based on the image section information;
A comparison image DB for storing the generated comparison image; And
And a payment processing unit that checks whether a predetermined amount is transferred from the financial account of the member from the financial server, and provides the member with a comparison image stored in the comparison image DB when the transfer is confirmed. 5. The method of claim 4,
And when the money transfer information of the member is confirmed from the financial server, an amount of money allocated from the financial server to a financial account of the image processing apparatus and the image providing server at a predetermined ratio is transferred.
KR1020110065435A 2011-07-01 2011-07-01 System for comparison processing of moving pictures KR101260862B1 (en)

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GB2575486A (en) * 2018-07-12 2020-01-15 Douwe Egberts Bv Drip filter head and method
KR20220037107A (en) * 2020-09-17 2022-03-24 주식회사 지누소프트 Method and apparatus of coaching home training service

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Publication number Priority date Publication date Assignee Title
JP3925466B2 (en) * 2003-06-10 2007-06-06 株式会社日立製作所 Stream data editing method and apparatus
KR100685221B1 (en) * 2005-05-06 2007-02-22 주식회사 시큐인포 Golf swing motion analysis system and operation method thereof
KR100772497B1 (en) * 2006-10-09 2007-11-01 박찬애 Golf clinic system and application method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2575486A (en) * 2018-07-12 2020-01-15 Douwe Egberts Bv Drip filter head and method
GB2575486B (en) * 2018-07-12 2023-02-01 Douwe Egberts Bv Drip filter head and method
KR20220037107A (en) * 2020-09-17 2022-03-24 주식회사 지누소프트 Method and apparatus of coaching home training service

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