WO2006126391A1 - コンテンツ処理装置及びコンテンツ処理方法、並びにコンピュータ・プログラム - Google Patents
コンテンツ処理装置及びコンテンツ処理方法、並びにコンピュータ・プログラム Download PDFInfo
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- WO2006126391A1 WO2006126391A1 PCT/JP2006/309378 JP2006309378W WO2006126391A1 WO 2006126391 A1 WO2006126391 A1 WO 2006126391A1 JP 2006309378 W JP2006309378 W JP 2006309378W WO 2006126391 A1 WO2006126391 A1 WO 2006126391A1
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Classifications
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
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- G06F16/78—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually
- G06F16/783—Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually using metadata automatically derived from the content
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Definitions
- the present invention relates to a content processing apparatus and content processing method for performing processing such as indexing on video content obtained by recording of television broadcast, and a computer program, in particular, and more particularly to recorded video content
- the present invention relates to a content processing apparatus and a content processing method for determining scene switching according to a topic (that is, a topic) taken up in a program and dividing or classifying each scene, and a computer program.
- a content processing apparatus for detecting switching of a video content's topic using telops included in video, dividing the content into topics, and indexing the content.
- the present invention relates to a content processing method and a computer program, and more particularly, to a content processing device and a content processing method for detecting a topic with a relatively small amount of processing while using telops included in video, and a computer program.
- Broadcast technology encompasses a wide range of technologies, including signal processing and transmission / reception, and audio and video information processing.
- the penetration rate of television is installed in almost all homes, and the broadcast content delivered from each broadcasting station is viewed by an unspecified number of people. Also, as another form of viewing broadcast content, the received content may be recorded once by the viewer side and played back at a desired time.
- HDDs node 'disks' drives
- PCs personal 'computers
- An HDD is a device capable of random 'access to recorded data. Therefore, when playing back recorded content, as in the case of conventional video 'tapes', it is not necessary to simply play back recorded programs in order of head power (or a specific program in a program) Scenes and specific corners) forces can also start playback directly.
- a receiver (TV or video recording / playback device) equipped with a large-capacity storage such as a disk device is used to receive broadcast content, temporarily store it in the receiver, and play back it in Called "type broadcast".
- a server type broadcast system a user who needs to watch in real time such as a normal television reception can watch a broadcast program at a time according to his convenience.
- a scene 'change detection method which detects that the scene of an image has changed when it is too large (see, for example, Patent Document 1).
- Patent Document 1 When creating a histogram, a certain number is distributed and added to the relevant level and the adjacent levels on both sides, and then the result of the new histogram is calculated by standardizing, and this new By detecting that the scene of the image of every two screens has changed using the calculated histogram, it is possible to detect the scene change correctly also for the faded image. [0009] While doing so, the scene 'change points are very numerous during the show.
- a proposal has been made for a broadcast program content menu creating apparatus that detects telops in a frame as a characteristic image part, extracts video data consisting of only telops, and automatically creates a menu indicating the contents of the broadcast program.
- a broadcast program content menu creating apparatus that detects telops in a frame as a characteristic image part, extracts video data consisting of only telops, and automatically creates a menu indicating the contents of the broadcast program.
- edge detection edge detection
- edge calculations are expensive.
- the amount of calculation becomes huge because edge calculation is performed in every frame.
- the same device can The main purpose is to automatically create a program menu of a news program using a telop, and the detected telop power also identifies changes in the topic of the program, and performs video indexing using the topic. is not. That is, how should video indexing be performed using the information of the telop detected from the frame, and solve the problem.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-282318
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-271741
- Patent Document 3 Japanese Patent Application Laid-Open No. 2004-364234
- the object of the present invention is to discriminate a scene change according to a topic (a topic) taken up in a program and recorded video content, and preferably perform video indexing by dividing it into scenes. It is an object of the present invention to provide an excellent content processing apparatus and content processing method, and a computer program that can
- An object of the present invention is to provide an excellent content processing apparatus and method, and a computer program.
- a further object of the present invention is to provide an excellent content processing apparatus and content processing method, and a computer capable of detecting a topic with a relatively small amount of processing while using a telop included in video. To provide the program.
- a first aspect of the present invention is a content processing apparatus for processing video content which is a time-series force of an image frame, which is to be processed
- a scene change detection unit for detecting a scene change point at which a scene changes significantly due to switching of an image frame from video content
- a topic detection unit that detects, from video content to be processed, a section in which the same stationary telop appears across a plurality of continuous image frames;
- An index storage unit for storing index information related to the time of each section in which the same static telop appears, detected by the topic detection unit;
- a content processing apparatus comprising:
- a viewing mode in which broadcast content such as a television program is received and temporarily stored in a receiver for force reproduction is becoming common.
- broadcast content such as a television program
- server-based broadcasting system enables recording of programs for several tens of hours, only scenes where users are interested are searched for scenes.
- ⁇ style is effective. In order to perform scene search and digest viewing on such recorded content, it is necessary to index the video.
- the video content power has been generally indexed by detecting scene 'change points, but there are a large number of scene' change points in the program, which is desirable for the user. It is considered as a habit that is not suitable for indexing.
- a scene change point is detected from the video content to be processed, and the frame that goes back and forth at each scene change point is used to detect the scene change point. It detects whether the telop has appeared in the position. Then, when the appearance of the tick is detected, the section in which the same still tick is appearing is detected, thereby minimizing the opportunity of the edge detection processing for extracting the tick, and minimizing the tovik Processing load for detection can be reduced.
- the topic detection unit creates an average image of frames in front of and after a scene change point, for example, in 1 second, and performs telop detection on the average image. If the telop continues to be displayed before and after the scene change, by making the average image, the terror part will be clear and the other part will be blurred, so the telop detection accuracy is high. You can This telop detection can be performed by edge detection, for example.
- the topic detection unit compares the frame in front of the scene 'change point where the telop is detected with the telop area, and detects the position where the telop area disappears from the telop area as the start position of the topic. Do.
- the scene 'change point force where a telop is detected also compares the rear frame and the telop area, and also detects the position where the telop area disappears as the end position of the topic. Whether or not the telop area power has disappeared, for example, the average color for each color element in the telop area is calculated for each frame to be compared, and the Euclidean distance of these average colors between the frames is set to a predetermined threshold value. It can be determined with less processing load depending on whether it has exceeded. Of course, by using the same method as the well-known scene change detection in the telop area, it is possible to more precisely detect the disappearance position of the telop.
- an alternative is to use edge information to determine the presence or absence of a tape. That is, for each frame to be compared, an edge image in the telop area is determined, and the presence of the telop in the telop area is determined based on the comparison result of the edge images in the telop area between the frames. Specifically, for each frame to be compared, an edge image in the telop area is determined, and it is determined that the telop has disappeared when the number of pixels of the edge image detected in the telop area is sharply reduced. When the change in is small, it can be determined that the same telop continues to appear. Incidentally, it can be determined that a new telop has appeared when the number of pixels in the edge image has rapidly increased.
- the number of edge images does not change much even if the telop changes. Therefore, even if the change in the number of pixels of the edge image in the telop area is small between frames, the respective edge images are ANDed with each corresponding edge pixel, and the result image is obtained. If the number of edge pixels in the image is rapidly reduced (eg, one-third or less), it is possible to estimate that the telop has changed, that is, the start or end position of the telop.
- the topic detection unit may detect the telop start position and end position force detected by the topic detection unit.
- the false detection may be reduced by determining the appearance time of the tag and determining that it is a topic only when the appearance time of the telop is a predetermined time or more.
- the topic detection unit may determine whether the telop is a necessary telop based on the size or position information of the telop area in which the telop is detected in the frame.
- the telop detection is performed in consideration of the position information and the size at which the telop appears in the video frame. False positives can be reduced.
- a second aspect of the present invention is a computer program written in a computer readable form so as to execute processing on video content consisting of a time series of image frames on the computer system.
- a scene change detection procedure for detecting a scene change point at which a scene changes significantly due to switching of an image frame from video content to be processed
- the frame before and after the scene change point detected in the scene change detection procedure is used to detect whether a telop appears at the scene change point, and the scene change point at which the telop is detected
- An index accumulation procedure for accumulating index information related to the time of each section in which the same stationary telop appears, detected in the topic detection procedure
- a computer program characterized in that a reproduction procedure for reproducing and outputting, and allowing a computer to execute.
- a computer 'program' according to the second aspect of the present invention defines a computer 'program written in computer readable form so as to realize predetermined processing on the computer' system.
- the computer system by installing the computer program according to the second aspect of the present invention into the computer system, the computer system In this case, a cooperative action is exhibited, and the same action and effect as the content processing apparatus according to the first aspect of the present invention can be obtained.
- the present invention it is possible to detect topic switching of video content using telops included in video, divide the content for each topic, and preferably perform video indexing.
- An excellent content processing apparatus and content processing method, and a computer program can be provided.
- the present invention for example, it becomes possible to divide a recorded television program into topics.
- users can efficiently view programs such as digest viewing.
- the user can, for example, look at the beginning of a topic to confirm when playing back recorded content, and can easily skip to the next topic if not interested.
- editing work such as cutting out only the topic that you want to keep.
- FIG. 1 is a view schematically showing a functional configuration of a video content processing apparatus 10 according to an embodiment of the present invention.
- FIG. 2 is a view showing an example of a screen configuration of a television program including a telop area.
- FIG. 3 is a flowchart showing a procedure of topic detection processing for detecting a section in which the same static telop appears from video content.
- FIG. 4 is a diagram for explaining a mechanism for detecting a telop as well as an average image strength before and after a scene change point.
- Fig. 5 shows a mechanism to detect telops of average image power before and after the scene change point. It is a figure for demonstrating.
- FIG. 6 is a view for explaining a mechanism for detecting a telop as well as an average image strength before and after a scene change point.
- FIG. 7 is a view for explaining a mechanism for detecting a telop as well as an average image strength before and after a scene change point.
- FIG. 8 is a diagram showing a configuration example of a telop detection area in a video frame having an aspect ratio of 720 ⁇ 480 pixels.
- FIG. 9 is a diagram showing detection of the start position of a topic from a frame 'sequence.
- FIG. 10 is a flow chart showing a processing procedure for detecting the start position of a topic from a frame 'sequence.
- FIG. 11 is a diagram showing how a topic end position is detected from a frame sequence.
- FIG. 12 is a flow chart showing a processing procedure for detecting the end position of the topic from the frame sequence.
- FIG. 1 schematically shows a functional configuration of a video content processing apparatus 10 according to an embodiment of the present invention.
- the illustrated video content processing apparatus 10 includes a video storage unit 11, a scene change detection unit 12, a topic detection unit 13, an index storage unit 14, and a reproduction unit 15.
- the video storage unit 11 demodulates and stores a broadcast wave, and stores video content downloaded from an information resource via the Internet.
- the video storage unit 11 can be configured using a hard disk recorder or the like.
- the scene change detection unit 12 takes out video content to be subject to topic detection from the video storage unit 11 and tracks a scene (scene or scene) in successive image frames.
- the scene change detection unit 11 can be configured by applying the scene change detection method disclosed in Japanese Patent Application Laid-Open No. 2004-282318, which is already assigned to the present applicant.
- the histogram of the components that make up the image is created for the images of two screens in one continuous field or one frame, and the sum of the differences is calculated and greater than the set threshold Detect a scene change point due to a scene change in the image.
- the topic detection unit 12 detects a section in which the same static tape appears from the video content to be subjected to topic detection, and outputs the section as a section in which the same topic is continued in the same video content. .
- the telop displayed in a frame is important in specifying or estimating the topic of the broadcast program in the display section.
- the number of frames to be edge-detected is minimized as much as possible based on the scene change point where the video content force is detected, and the section in which the same stationary telop appears is detected.
- the section in which the same stationary telop appears can be regarded as a period during which the same topic continues in the broadcast program, and it can be treated as one block with division of the video content or with the video index. Be considered suitable for digest viewing. Details of the topic detection process will be given later.
- the index storage unit 14 stores time information related to each section in which the same stationary telop appears, which is detected by the topic detection unit 11.
- the following table shows an example of the configuration of time information stored in the index storage unit 14.
- a record is provided for each detected section, and the title of the topic corresponding to the section and the start time and end time of the section are recorded in the record.
- index information can be described using a general structural description language such as XML (extensible Markup Language).
- the topic title can be the title of the video content (or broadcast program) or the text information of the displayed telop.
- the playback unit 15 takes out the video content instructed to be played back from the video storage unit 11, decodes it, demodulates it, and outputs video and sound.
- the playback unit 15 acquires appropriate index information by the content name of the index storage unit 14 at the time of content playback and associates the index information with the content. For example, when a certain topic is selected from the index information managed in the index storage unit 14, the corresponding video content is extracted from the video storage unit 11 and is described as index information. The section up to the end time is reproduced and output.
- the present embodiment it is determined whether a telop appears at the corresponding position using frames that precede and follow at each scene change point detected by the scene change detection unit 12. To detect Then, when the appearance of the telop is detected, the section in which the same stationary telop appears is detected, so the opportunity of the edge detection processing for extracting the telop is minimized and the topic detection is performed. Processing load can be reduced.
- the topic detection unit 13 detects an interval in which such a static telop appears, and indexes the detected interval as one topic.
- FIG. 3 illustrates, in the form of a flowchart, a procedure of topic detection processing for detecting, from the video content, a section in which the same static telop appears, in the topic detection unit 13.
- the frame at the first scene change point is extracted (step S1), and an average image of a frame one second after the scene change point and a frame one second before the scene change point Are generated (step S2), and telop detection is performed on this average image (step S3).
- step S1 the frame at the first scene change point is extracted (step S1), and an average image of a frame one second after the scene change point and a frame one second before the scene change point Are generated (step S2), and telop detection is performed on this average image (step S3).
- the frame used to create the average image is not limited to the frame one second before and after the scene change point. It's important that the scene is a frame before and after the change point, and you want to use more frames to create an average image.
- FIG. 4 to 6 illustrate how a telop is detected from an average image before and after a scene change point. Since the scene changes greatly between the frames before and after the scene change point, averaging causes the images to overlap with each other and blurs as if it were alpha-blended. On the other hand, when the same static telop continues to appear before and after the scene change point, the telop part remains clear, and as shown in FIG. Relatively emphasized. Therefore, it is possible to extract the telop area with high accuracy by the edge detection process. On the other hand, when the telop area appears only before or after the scene change point (or when the stationary tep changes), as shown in FIG. Since the telop area is also blurred, it is not necessary to detect the telop erroneously.
- telops are characterized in that their luminance is higher than that of the background. Therefore, it is possible to apply a method for detecting telops using edge information. For example, ⁇ UV conversion is performed on the input image, and edge calculation is performed on the ⁇ component.
- edge calculation technique for example, a telop information processing method described in Japanese Patent Laid-Open No. 2004-343352 already assigned to the present applicant, or an artificial picture described in Japanese Patent Laid-Open No. 2004-318256. An image extraction method can be applied.
- step S4 when the average image power can also detect a telop (step S4), among the detected rectangular areas, those which satisfy the following conditions, for example, are extracted as a telop area.
- FIG. 8 shows a configuration example of a telop detection area in a video frame having an aspect ratio of 720 ⁇ 480 pixels.
- FIG. 9 illustrates how the start position of the topic is detected from the frame 'sequence in step S5.
- the telop areas are compared by sequentially going back one frame at a time. Then, when a frame in which the telop area strength disappears is detected, a frame immediately behind it is detected as the start position of the topic.
- FIG. 10 shows, in the form of a flowchart, a processing procedure for detecting the start position of the topic from the frame sequence in step S5.
- step S21 the frame is obtained (step S22), and the telop areas are compared between the frames (step S23). Then, if there is no change in the telop area (No in step S24), since the telop continues to appear, the process returns to step S21, and the same process as described above is repeated. If there is a change in the telop area (Yes in step S24), it means that the telop has disappeared, so the frame immediately before that is output as the start position of the topic, and the processing routine is ended.
- the telop area is compared in the procedure with respect to the frame following the scene 'change point where the telop is detected, and the telop area force is also one time earlier than the frame where the telop has disappeared.
- the frame of is detected as the end position of the topic (step S6).
- FIG. 11 illustrates how a topic's end position is detected from a frame 'sequence.
- the telop areas are compared by advancing sequentially for each frame. Then, when the telop area force also detects a frame in which the telop has disappeared, a frame immediately before that is detected as the end position of the topic.
- FIG. 12 illustrates, in the form of a flowchart, a processing procedure for detecting the end position of the topic from the frame sequence in step S6.
- step S31 if there is a frame behind the current frame position (step S31), that frame is taken. Then, the telop area is compared between the frames (step S33). Then, if there is no change in the telop area (No in step S34), since the telop continues to appear, the process returns to step S31, and the same process as described above is repeated. Also, if there is a change in the telop area (Yes in step S34), it means that the telop has disappeared, so that the frame one frame after that is output as the end position of the topic, and the processing routine is ended.
- the front and rear of the scene change point is set as the start position.
- the position where the telop has disappeared can be detected precisely. Or, in order to reduce the processing, let's try to detect the approximate telop loss position by the following method.
- the telop area force also determines whether the telop has disappeared. For example, for each frame to be compared, the average color of each element of RGB in the telop area is calculated, and the Euclidean distance of these average colors between the frames. It can be determined with less processing load depending on whether the force exceeds a predetermined threshold. That is, let RO, GO, and BO be the average color (average of each element of RGB) of the region of the frame of the scene 'change point, that is, the scene'
- Scene 'change point force satisfying equation (1) It is determined that the telop disappears at the nth frame forward or backward.
- the threshold value is, for example, 60.
- an edge image in the telop area is determined for each frame to be compared, and it can be determined that the telop has disappeared when the number of pixels of the edge image detected in the telop area is rapidly reduced. Conversely, when the number of pixels increases rapidly, it can also be determined that a telop has appeared. Also, when the edge has a small change in the number of pixels in the image, it can be determined that the same terrorist continues to appear.
- step S23 in the flowchart shown in FIG. 10 and step S33 in the flowchart shown in FIG. 12 the number of edge points (number of pixels) of Ed gelmgl and EdgelmgN is compared, and the number of edge points is abrupt. If it decreases (for example, one third or less), it can be estimated that the telop has disappeared (and conversely, if it increases rapidly, it can be assumed that the telop has appeared).
- the detection accuracy can be enhanced by estimating the telop change, ie, the start or end position of the telop.
- the telop end position force obtained in step S6 is also subtracted from the telop start position obtained in step S5 to obtain the appearance time of the telop.
- the false detection can be reduced by determining that the topic is a topic only when the appearance time of this telop is equal to or longer than a fixed time (step S7).
- program genre information from an EPG (Electric Program Guide) and change the threshold of appearance time according to the genre. For example, in the case of news, tickers appear for a relatively long time, so 30 seconds can be used for variety, and 10 seconds for variety.
- step S7 the start position and the end position of the telop detected as a topic are stored in the index information storage unit 14 (step S8).
- the topic detection unit 13 inquires of the scene change detection unit 12 to check whether or not there is a scene change point after the telop end position detected in step S6 in the video content (step S9). ). If there is no longer a scene change point after the telop end position, the entire processing routine is ended. On the other hand, if there is a scene change point after the end point of the teleop, move to the frame of the next scene change point (step S10), return to step S2, and detect the above-mentioned topic.
- the topic detection unit 13 inquires of the scene change change unit 12 that the video content is to be displayed. Check if there is a next scene change point (step Sl l). If the next scene change point is no longer present, the entire processing routine is ended. On the other hand, if there is the next scene change point, the process moves to the frame of the next scene change point (step S10), returns to step S2, and repeats the above-described topic detection process.
- the telop detection process is performed on the premise that telop areas are present at the four corners of the television image.
- telop areas are present at the four corners of the television image.
- the same telop may appear again several seconds after the telop has disappeared from the screen.
- the telop display is interrupted or temporarily interrupted, if the following conditions are satisfied, the telop is treated as continuous (that is, the topic continues). It is possible not to generate useless indexes.
- genre information of a television program may be acquired from the EPG, and the threshold value of the interruption time may be changed according to the genre such as news and variety.
- the content processing apparatus can preferably index various video contents produced and edited for purposes other than television broadcasting and including telop areas representing topics.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Library & Information Science (AREA)
- Data Mining & Analysis (AREA)
- Databases & Information Systems (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Television Signal Processing For Recording (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
Description
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KR1020077001835A KR101237229B1 (ko) | 2005-05-26 | 2006-05-10 | 콘텐츠 처리 장치 및 콘텐츠 처리 방법 |
US11/658,507 US20090066845A1 (en) | 2005-05-26 | 2006-05-10 | Content Processing Apparatus, Method of Processing Content, and Computer Program |
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JP2006108310A JP4613867B2 (ja) | 2005-05-26 | 2006-04-11 | コンテンツ処理装置及びコンテンツ処理方法、並びにコンピュータ・プログラム |
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Also Published As
Publication number | Publication date |
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KR101237229B1 (ko) | 2013-02-26 |
JP4613867B2 (ja) | 2011-01-19 |
KR20080007424A (ko) | 2008-01-21 |
US20090066845A1 (en) | 2009-03-12 |
JP2007006454A (ja) | 2007-01-11 |
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