WO2001043420A2 - A method and an apparatus for implementing a key frame - Google Patents
A method and an apparatus for implementing a key frame Download PDFInfo
- Publication number
- WO2001043420A2 WO2001043420A2 PCT/US2000/042486 US0042486W WO0143420A2 WO 2001043420 A2 WO2001043420 A2 WO 2001043420A2 US 0042486 W US0042486 W US 0042486W WO 0143420 A2 WO0143420 A2 WO 0143420A2
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- WO
- WIPO (PCT)
- Prior art keywords
- attribute
- keyframeds
- key frame
- key
- klv
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/81—Monomedia components thereof
- H04N21/8126—Monomedia components thereof involving additional data, e.g. news, sports, stocks, weather forecasts
- H04N21/8133—Monomedia components thereof involving additional data, e.g. news, sports, stocks, weather forecasts specifically related to the content, e.g. biography of the actors in a movie, detailed information about an article seen in a video program
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
Definitions
- This invention relates generally to describing and accessing of data. More specifically, the invention relates to mechanisms and techniques that enable data related to an audiovisual work to be described and accessed.
- Key frames have a variety of uses in terms of describing data pertaining to an audiovisual work.
- a key frame is a single frame that tags a plurality of frames related to a sequence of images that meet certain criteria designated by a user. For example, a description such as a title of a scene to a movie, or other information related to a particular scene may be recorded in a key frame. In this manner, the key frame is able to provide a summary of an audiovisual work that allows near random access to frames within the audiovisual work.
- key frames may also be used for comparing a video with another video or for reviewing a summary of the series of frames in a document that is generated from the key frame.
- a key frame is generally static. Once a key frame is made, the key frame generally cannot be updated. If the criteria for the key frame is changed, a new key frame must be created. Creating a new key frame is time consuming and expensive. It is therefore desirable to have a system that addresses this disadvantage.
- KeyFrameDS a key frame description scheme
- KeyFrameDS may be used to describe or summarize a work such as an audiovisual work based upon a criterion or criteria provided by, for example, a user.
- KeyFrameDS that includes a set of attributes such as other description schemes, describes changes that are to be made to the set of description schemes.
- KeyFrameDS may use attribute groups containing sets of attributes such as the key, length, and value (KLN) to accomplish this task.
- the KeyFrameDS may be updated in a variety of ways. In one embodiment, KeyFrameDS is updated by modifying an attribute such as the value attribute. In another embodiment, KeyFrameDS is updated by adding, deleting, or changing description schemes attached to the value attribute of a KLN attribute group. These methods for updating the KeyFrameDS allow a user to select, for example, another set of frames in an audiovisual work to provide another description or summary to the audiovisual work. Updating the KeyFrameDS may be accomplished by a sender (e.g., a server, a broadcast unit, etc.) sending a command such as a commandDS to a receiver (e.g., client, set-top box, etc.). CommandDS includes instructions such as to add, change, or delete one or more attributes or to add, change or delete a description scheme.
- a sender e.g., a server, a broadcast unit, etc.
- CommandDS includes instructions such as to add, change, or delete one or more attributes or to add,
- a KeyFrameDS that includes the attribute groups K j L j N j , may be used to provide a summary of these historical sites.
- the person may be interested in finding restaurants in the city.
- the person inputs information that changes the value attribute (N j ) in the K 1 L 1 N 1 attribute group in the KeyFrameDS that searches historical sites to restaurants.
- the length of bytes associated with the value attribute typically changes when the value attribute changes, so the attribute L ⁇ is modified to attribute L 2 .
- the remainder of the information in the KLN attribute group of the KeyFrameDS remains unchanged by the user such as the city in which the search is to be performed.
- the computer system executes this request and presents a list of restaurants to the user.
- KeyFrameDS involves placing entities such as other description schemes into the value attribute of a KLN attribute group in a KeyFrameDS in a universally recognizable format, such as in a description definition language (DDL).
- DDL description definition language
- the value attribute of the KeyFrameDS may be modified regardless of syntactic or semantic distinctions that may exist between, for example, semantic data that describes a syntactic audiovisual object.
- Figure 1 illustrates a block diagram of one embodiment of a computer system that includes servers
- Figure 2 illustrates a block diagram of one embodiment of another computer system related to a peer-to-peer system
- Figure 3 illustrates a block diagram of another embodiment of a computer system
- Figure 4 illustrates a flow diagram of one embodiment for updating a key frame.
- a description or a summary of portions of the audiovisual work that contain certain criteria designated by a person such as a user of a computer system.
- the criteria may be changed to incorporate different information.
- a key frame such as a key frame description scheme (KeyFrameDS)
- KeyFrameDS is a description scheme that includes other description schemes.
- the KeyFrameDS is updated.
- the KeyFrameDS includes a list of attribute groups.
- Each attribute group includes a key, length, and value attribute (KLN).
- the key attribute typically an object/class, describes other description schemes. For instance, the key attribute may indicate that the key frame relates to the rules of a soccer game that is to be broadcast.
- the length attribute generally refers to the number of bytes associated with the value attribute.
- the value attribute that includes one or more elements, is used to instantiate the object or class provided by the key attribute.
- the value attribute is where a set of description schemes attach thereto. Typically, the value attribute and the length attribute are modified whereas the key attribute generally remains unchanged when values are altered. If the description schemes themselves are altered, the key attribute changes to reflect the new description scheme name.
- Updating the KeyFrameDS includes adding, deleting, or modifying attributes in attribute groups contained in KeyFrameDS.
- the KeyFrameDS is updated.
- the value contained in a value attribute of a KLN attribute group of the KeyFrameDS may be modified.
- the value attribute may be modified by updating the description schemes contained in or pointed to by the value attribute.
- Updating the KeyFrameDS may be accomplished by a sender (e.g., a server, a broadcast unit, etc.) sending a command such as a commandDS to a receiver (e.g., client, set-top box, etc.).
- the commandDS contains information for making a change to at least one attribute of the KeyFrameDS or add, delete, or change a description scheme.
- the commandDS may require that the change occur at read time or any other suitable time.
- a user may update a KeyFrameDS during, for example, a broadcast of a sports program on a television. Additionally, the state of the descriptions may change to reflect a change to the underlying audiovisual content.
- Figures 1 through 3 illustrate computer systems that may implement various features of a KeyFrameDS to change attributes such as description schemes.
- a description scheme is a characteristic associated with the data and may be the value of a value attribute.
- attributes may include syntactic description schemes (e.g., arrangement of words), semantic description schemes (e.g., meanings of words), a mixture of these description schemes, or any other suitable characteristics of data.
- the attributes of the KeyFrameDS may be dynamically changed by a user, a server, a client, or any other suitable device.
- the KeyFrameDS includes attributes such as key, length, and value (KLV), grouped into the KLV attribute groups.
- Key attribute is a tag that uniquely identifies an object/class (e.g., a set of data with similar characteristics).
- a key attribute describes a description scheme and typically remains unchanged.
- Length attribute is the number of bytes associated with the value attribute. The length attribute may be skipped if a receiver (e.g., client, set- top box, etc.) of the KeyFrameDS does not recognize the object/ class thereby reducing the amount of time to process a KeyFrameDS.
- the value attribute is used to instantiate the object/ class.
- KeyFrameDS interactions may be implemented on a server-side through servers (2, 4) and on the client-side through clients (6, 8). Each of these implementations is discussed below.
- Computer system 1 includes servers (2, 4) and clients (6, 8).
- Clients (6, 8) are applications that operate on a personal computer or a workstation to input data used in key frames.
- Servers (2, 4) are computers or devices on a network that manage network resources.
- server 2 is a computer and storage device dedicated to the task of storing data and searching KeyFrameDS.
- Program instructions e.g., computer program, software, etc.
- Program instructions that may enhance techniques of the invention include a standard generalized markup language such as extensible markup language schemes (XML) and description definition language (DDL).
- Scheme XML uses two types of data items such as elements and attributes in order to change a description in, for example, a KeyFrameDS, related to an audiovisual work.
- KeyFrameDS involves placing the key frame in a universally recognizable format, such as in the DDL.
- an attribute group such as the value attribute group of the KeyFrameDS may be modified regardless of syntactic or semantic distinctions that may exist between, for example, semantic data that describes a syntactic audiovisual object.
- server 4 may be a file server, print server, or any other suitable server to perform certain functions.
- KeyFrameDS On the server-side, a mechanism is used for updating KeyFrameDS.
- KeyFrameDS is updated by modifying an attribute such as the value attribute.
- KeyFrameDS is updated by attaching, adding, deleting, or changing description schemes. Updating the KeyFrameDS may be accomplished by a sender such as server 4 sending a commandDS to a receiver such as server 2.
- CommandDS contains the information to update the KeyFrameDS.
- commandDS includes changes to at least one description scheme by indicating that a KLV attribute group, for instance, K J L J V J , should be changed to the KLV attribute group K j L 2 V 2 .
- CommandDS identifies that the key is K : which is the same as the key attribute in the original KLV attribute group in the original KeyFrameDS. This identifies the particular key frame (e.g., KeyFrameDS) to be updated and, in particular, the attribute to be updated in the KeyFrameDS.
- L 2 is the length of the new value attribute V 2 .
- CommandDS allows a receiver to add, change, or delete parts of a description (e.g., an audio description scheme related to descriptions of sound) dynamically based upon the user preferences (e.g., recordation of a title of a movie, important scenes in a movie, etc.) and or domain-specific attributes.
- the commandDS may also contain information for making the change during read time or at any other suitable time.
- the code for commandDS is as follows:
- commandDS the instructions include, for example, to add, change, or delete information associated with KeyFrameDS.
- CommandDS executed on server 2, may automatically update the KeyFrameDS and then search for data in a database such as that which is stored on server 2 that complies with the requirements established by the new KeyFrameDS.
- commandDS may require that an attribute for the KeyFrameDS be modified based upon a factor such as time (e.g., every fifteen seconds an attribute such as the value attribute automatically changes based upon program instructions executed on the server).
- the commandDS may require that an attribute or attributes (e.g., description schemes) attached to the KLV attribute group of a key frame such as KeyFrameDS change, for example, every fifteen seconds.
- a KeyFrameDS such as gameKeyFrameDS may be used in a sports program such as a soccer game. If a soccer game is being played, one screen of a split screen may be used to display information pertaining to the soccer players.
- GameKeyFrameDS may be used to automatically control the type of information displayed on, for example, a graphical user interface (GUI) of client 6.
- GUI graphical user interface
- GameKeyFrameDS may include a plurality of attributes such as a player description scheme (playerDS), soccer description scheme (soccerDS), audio description scheme (audioDS), and transcoding description scheme (transcoding DS). Each description scheme may appear on a GUI as a hyperlink.
- playerDS player description scheme
- stroccerDS soccer description scheme
- audioDS audio description scheme
- transcoding DS transcoding description scheme
- Each description scheme may appear on a GUI as a hyperlink.
- an attribute such as the playerDS may be used that links the player's name to information such as the player's age, height, weight, and a short summary of the player's career history.
- Other information that may be related to playerDS includes a color descriptor to describe the color of the player's uniform.
- Server 2 could automatically change the attribute such as playerDS every fifteen seconds by changing the name of a first player to the name of a second player player.
- the player's name may be changed by, for instance, the program instructions alphabetically rotating players last name every fifteen seconds.
- Information such as age, height, weight, and career history that is associated with the name of the player is automatically updated when the player's name is changed. This new information is then sent over interconnect 13 to client 6.
- a user may then view the new gameKeyFrameDS and the data associated with the gameKeyFrameDS.
- Other attributes that may be automatically modified by the program instructions include other descriptive schemes such as soccer description scheme (soccerDS), audio description scheme (audioDS), transcoding description scheme (transcodingDS), and time description scheme (timeDS). Each of these descriptive schemes is described below.
- SoccerDS contains descriptions related to the rules associated with the game of soccer. For example, this attribute may indicate that the soccer ball must be hit by a player into an area defined by goal posts and a net in order for a point to be added to the team's score. Another rule may be that a soccer player cannot hold the soccer ball in his or her hands. Various other suitable rules may be incorporated into this attribute.
- AudioDS contains audio related descriptions for sound such as sound effects, instruments, speech recognition, music, or any other suitable audio description.
- audioDS may provide the voice of the sportscaster broadcasting the event.
- TranscodingDS contains descriptions related to the coding type of the audiovisual work such as a picture.
- transcoding may involve converting from a picture format to another format (e.g., Moving Picture Experts Group - 2 Standard (MPEG-2) to H. 263).
- MPEG-2 Moving Picture Experts Group - 2 Standard
- TimeDS is generally composed of two elements: the start time point and the duration of a particular segment.
- Time stamping is used to mark areas in a multimedia work.
- a time stamp may be used to mark a certain play in the soccer game in order to allow that play to be replayed for the audience. Any one of these description schemes may be automatically modified by server 2 as explained herein.
- another embodiment relates to weighting attributes of a KeyFrameDS.
- one attribute may be assigned a weight of "1" that means very important such as playerDS and timeDS while the weight of "5" is assigned to another attribute and means least important such as soccerDS.
- an attribute such as a group name may be considered very important. Therefore, this attribute is assigned a value of importance of "1" such as for the key and length code provided below.
- server 2 or a user of a computer system is able to dynamically determine, for example, the types of attributes that should be more frequently displayed to a user.
- KeyFrameDS may mark an audiovisual work through a reference identifier (ID) by using methods known in the art.
- a reference ID indicates a certain location in an audiovisual work.
- a reference ID may include a media or a medium locator to specify the "location" of a particular image, audio, or video segment by referencing the media data.
- medium locators such as the video segment locator, the audio segment locator, the image locator, and the sound locator. In this manner, a user may randomly access frames designated with a reference ID.
- Another implementation of updating the KeyFrameDS may be performed by a user inputting and sending changes using a commandDS through, for example, client 6 to a server of the computer system shown in Figure 1.
- Clients (6, 8) rely upon a server such as servers (2, 4) to perform certain operations such as to input a commandDS to update KeyFrameDS in order to access previously stored information related to the KeyFrameDS.
- Server 2 also allows or causes information to a KeyFrameDS to be added, changed, or deleted.
- the KeyFrameDS may be updated by having one of its attribute groups or weights changed such as the KLV (key, length, and value) attribute groups, or their corresponding weights.
- a user will modify a KLV attribute group by modifying the value attribute since the value attribute incorporates other attributes such as description schemes.
- information such as the shot identification, the scene identification, and key-frame building, or selecting parameters may be modified by the user through client 6.
- server 2 resegments the video, selects new key frames at the desired segment quantization level, and sends these KeyFrameDS to client 6.
- the user may input attributes such as description schemes that are semantic, syntactic, or a mixture of those attributes into a client such as clients (6, 8).
- One means for inputting this information is by a user sending from client 6 a command such as commandDS to server 2.
- Server 2 receives and executes these instructions such as commandDS from client 6.
- Server 2 then may access information that has been stored in server 2 or server 4 such as data that is responsive to the KeyFrameDS. For instance, a very large collection of frames that may include a variety of possible parameter settings may be stored and accessed on server 2.
- Server 2 selects segments from the stored KeyFrameDS that represent those segments and that fit the parameters inputted by a user. Server 2 then sends this new KeyFrameDS and data corresponding to the new KeyFrameDS to client 6.
- the process reselects the KeyFrameDS for each segment and sends these KeyFrameDS' to client 6. If a query is processed, the KeyFrameDS are not in temporal order and the reordering of the KeyFrameDS is assumed.
- the KeyFrameDS structure that uses DDL, provides greater flexibility by allowing attributes such as semantic, syntactic, a mixture of semantic and syntactic attributes, or any other suitable characteristics of data to be added, changed, or deleted by automatically modifying the attribute groups in the
- KeyFrameDS or by a user sending a commandDS that instructs that certain changes be made. It will be appreciated that the KeyFrameDS structure and the use of commandDS to change a content of the key frame structure may also be extended to define other description schemes with similar requirements.
- Peer-to-peer system 3 is a type of network in which each workstation such as servers (14, 15) have equivalent capabilities and responsibilities. For example, there may be two peer computers or servers on the same network. This differs from client /server architectures, in which some computers are dedicated to serving the others. Peer-to-peer networks are generally simpler and less expensive, but they usually do not offer the same performance under heavy loads.
- servers (14, 15) are coupled through interconnect
- Client 6 may access the KeyFrameDS to add, delete, or change a value for an attribute or an element for an attribute in KeyFrameDS.
- a commandDS may be sent to client 6 from server 14 to update KeyFrameDS.
- client 6 Once client 6 has the initial list, updates such as in the form of adding, deleting, or modifying a KeyFrameDS may be sent from client 6 to server 14.
- Server 14 then updates or changes the description scheme(s) as described above.
- FIG. 3 illustrates an embodiment of another computer system 100 that implements the principles of the invention.
- Computer system 100 includes a stand alone or portable computing device.
- Computer system 100 comprises a processor 170, a storage device 180, and interconnect 150 such as a bus or a point-to-point link.
- Processor 170 is coupled to the storage device 180 by interconnect 150.
- a number of user input/output devices such as a keyboard 120 and display 125, are coupled to chip set (not shown) which is then connected to processor 170.
- the chipset (not shown) is typically connected to processor 170 using an interconnect that is different from interconnect 150.
- Processor 170 represents a central processing unit of any type of architecture (e.g., the Intel architecture, Hewlett Packard architecture, Sun Microsystems architecture, IBM architecture, etc.), or hybrid architecture. In addition, processor 170 could be implemented on one or more chips.
- Storage device 180 represents one or more mechanisms for storing data such as the plurality of elements that make up an attribute which may be incorporated into a key frame such as KeyFrameDS. Storage device 180 may include read only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, and /or other machine- readable media.
- Interconnect 150 represents one or more buses (e.g., accelerated graphics port bus, peripheral component interconnect bus, industry standard architecture bus, X-Bus, video electronics standards association related to buses, etc.) and bridges (also termed as bus controllers).
- FIG. 3 also illustrates that the storage device 180 has stored therein data 135 and program instructions (e.g., software, computer program, etc.) 136.
- Data 135 represents data stored in one or more of the formats described herein.
- Program instructions 136 represents the necessary code for performing any and /or all of the techniques described with reference to Figures 1, 2, and 4. It will be recognized by one of ordinary skill in the art that the storage device 180 preferably contains additional software (not shown), which is not necessary to understanding the invention.
- FIG. 3 additionally illustrates that the processor 170 includes decoder 140.
- Decoder 140 is used for decoding instructions received by processor 170 into control signals and /or microcode entry points. In response to these control signals and /or microcode entry points, decoder 140 performs the appropriate operations.
- Figure 4 illustrates a flow diagram of one embodiment for updating a key frame.
- At block 200 at least one attribute group, a set of attribute groups, or information pertaining to at least one description scheme is provided for an attribute such as KeyFrameDS. Attributes such as description schemes are attached to the value attribute to the KeyFrameDS. Attributes may be in the form of semantic, syntactic, or any other suitable characteristic of data.
- attribute groups are inserted into a key frame such as the KeyFrameDS.
- attributes such as other description schemes are attached to an attribute group such as the value attribute .
- a universally recognizable format such as DDL is used to insert the attributes into a KeyFrameDS.
- the KeyFrameDS may be modified, for example, by a server, a user, a client, or other suitable device.
- a command such as a commandDS is sent to, for instance, a server that requires the server to process the KeyFrameDS to change information about the KeyFrameDS.
- at least one attribute group of the KeyFrameDS may be updated.
- the value attribute or the length attribute are modified whereas the key attribute that describes the other description schemes generally remains unchanged, unless one is changing the description scheme to which the KLV attribute group refers.
- at least one attribute is added, deleted, or changed that is attached to the KeyFrameDS.
- a key frame such as KeyFrameDS is processed.
- the server or processor accesses stored information pertaining to the KeyFrameDS. This information may be stored in a storage medium or media such as a database or any other suitable means. In another embodiment, the server may connect to a network such as the Internet to access information.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU45133/01A AU4513301A (en) | 1999-11-30 | 2000-11-30 | A method and an apparatus for implementing a key frame |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
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US16843399P | 1999-11-30 | 1999-11-30 | |
US60/168,433 | 1999-11-30 | ||
US24228400P | 2000-10-20 | 2000-10-20 | |
US60/242,284 | 2000-10-20 | ||
US09/727,317 US6845487B1 (en) | 1999-11-30 | 2000-11-28 | Method and an apparatus for implementing a key frame |
US09/727,317 | 2000-11-28 |
Publications (2)
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WO2001043420A2 true WO2001043420A2 (en) | 2001-06-14 |
WO2001043420A3 WO2001043420A3 (en) | 2001-11-01 |
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PCT/US2000/042486 WO2001043420A2 (en) | 1999-11-30 | 2000-11-30 | A method and an apparatus for implementing a key frame |
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AU (1) | AU4513301A (en) |
WO (1) | WO2001043420A2 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5579471A (en) * | 1992-11-09 | 1996-11-26 | International Business Machines Corporation | Image query system and method |
US5915250A (en) * | 1996-03-29 | 1999-06-22 | Virage, Inc. | Threshold-based comparison |
US5982438A (en) * | 1996-03-22 | 1999-11-09 | Microsoft Corporation | Overlapped motion compensation for object coding |
US6075875A (en) * | 1996-09-30 | 2000-06-13 | Microsoft Corporation | Segmentation of image features using hierarchical analysis of multi-valued image data and weighted averaging of segmentation results |
US6144956A (en) * | 1994-03-18 | 2000-11-07 | Hitachi, Ltd. | Methods for retrieving text information in a database through image information and a program stored on a computer-readable storage medium for performing such a method |
-
2000
- 2000-11-30 AU AU45133/01A patent/AU4513301A/en not_active Abandoned
- 2000-11-30 WO PCT/US2000/042486 patent/WO2001043420A2/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US5579471A (en) * | 1992-11-09 | 1996-11-26 | International Business Machines Corporation | Image query system and method |
US6144956A (en) * | 1994-03-18 | 2000-11-07 | Hitachi, Ltd. | Methods for retrieving text information in a database through image information and a program stored on a computer-readable storage medium for performing such a method |
US5982438A (en) * | 1996-03-22 | 1999-11-09 | Microsoft Corporation | Overlapped motion compensation for object coding |
US5915250A (en) * | 1996-03-29 | 1999-06-22 | Virage, Inc. | Threshold-based comparison |
US6075875A (en) * | 1996-09-30 | 2000-06-13 | Microsoft Corporation | Segmentation of image features using hierarchical analysis of multi-valued image data and weighted averaging of segmentation results |
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WO2001043420A3 (en) | 2001-11-01 |
AU4513301A (en) | 2001-06-18 |
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