KR20100010196A - Method and apparatus for reproducing moving pictures - Google Patents

Abstract

PURPOSE: A video playing method skipping an audio or video frame based on a characteristic and a device thereof are provided to reduce searching time by enabling a user to rapidly search and select a scene from a moving picture file. CONSTITUTION: A decoder(30) decodes audio frames and video frames. If audio or video frames are received from the decoder, a skip determiner(40) compares characteristics of current audio or video frames with characteristics of previous audio or video frames. If characteristics are similar, the skip determiner skips video frames related to the current audio frames or the current video frames. A switch(72) performs switching between the decoder and display based on control of the skip determiner.

Description

METHOD AND APPARATUS FOR REPRODUCING MOVING PICTURES}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video playback method and apparatus, and more particularly, to a video playback method and a video playback apparatus for performing the same for easily and quickly searching a desired scene in a video file.

Recording media such as a video CD (Compact Disk) and a DVD (Digital Vedio Disk) are generally applied with a coding compression algorithm proposed by a moving picture engineer group (MPEG) to record moving image data. In the apparatus for reproducing the recording medium to which the encoding compression algorithm is applied, the encoded data is read from the recording medium and the original data is decoded from the encoded data to reproduce the moving picture recorded on the recording medium.

In the digital video player which plays back the recorded recording medium, a forward / reverse picture search function is provided to allow the user to easily search for a desired scene while playing the recording medium. This is provided. The forward / reverse screen search function sequentially displays screens preset in the selection direction corresponding to the forward or reverse selection keys selected by the user.

However, the screen search function as described above has a problem in that the user selects a screen direction in a forward or reverse direction and continues to watch even a scene that he or she does not want. In other words, while looking at the screen displayed in the forward or reverse direction from the current position had to find the scene you want. Because of this, the user had to bother to see even unwanted scenes, and it took some time to find the desired scene.

Accordingly, an object of the present invention is to provide a video reproducing method and a video reproducing apparatus for performing the same so that a desired scene can be easily and quickly searched in a video file.

An apparatus for playing a video file according to an aspect of the present invention for achieving the above object is a decoder for decoding an audio frame and a video frame, and receiving an audio frame or a video frame from the decoder, the current audio frame or the current video frame It is determined whether the predetermined feature of is similar to the predetermined feature of the previous audio frame or the previous video frame, and if similar, a skip determination unit for skipping the video frame or the current video frame related to the current audio frame is not output.

The video reproducing apparatus may further include a speaker for outputting the decoded audio frame and a display for outputting the decoded video frame.

The video reproducing apparatus may further include a switch configured to perform switching between the decoder and the display under the control of the skip determination unit.

Here, the predetermined feature of the video frame may be a color distribution of the video frame.

Here, the predetermined feature of the audio frame may be the sound size of the audio frame.

According to another aspect of the present invention, there is provided a method of playing a video file, which comprises: decoding an audio frame and a video frame, and predetermining a current audio frame or a current video frame. Determining whether the feature is similar to a predetermined feature of the previous audio frame or the previous video frame, and if similar, skipping the video frame or the current video frame associated with the current audio frame so that it is not output.

Here, the predetermined feature of the video frame may be a color distribution of the video frame.

Here, the predetermined feature of the audio frame may be the sound size of the audio frame.

Using the video playback method and apparatus according to the present invention as described above, the user can quickly search for a desired scene in the video file. In addition, according to the present invention, the user can immediately select the desired scene can be shortened the search time accordingly, avoiding the need to watch the unwanted scene.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

1 is a block diagram illustrating a video reproducing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the video playback apparatus 100 according to an embodiment of the present invention may include a controller 10, a memory 20, a decoder 30, a skip determination unit 40, a speaker 50, and a display ( 60).

The display 60 may be a liquid crystal display (LCD), an organic light emitting diode (OLED) panel, or the like.

The memory 20 stores a moving image file and may be configured as a recording medium such as a hard disk. At this time, the video file to be stored is composed of a header area, a data area, and an index area. In the case of the AVI format, video and audio data are alternately recorded in the data area of the video file. In addition, each data is stored in the memory 20 in record units. The controller 30 controls the operations of the decoder 30 and the skip determination unit 40 to implement the present invention.

The decoder 30 decodes the audio frame and the video frame of the video file. In addition, the decoder 30 is connected to the speaker 50 through the first switch 70 and to the display 60 through the second switch 72. The first switch 70 performs switching between the decoder 30 and the speaker 50 under the control of the skip determination unit 40. The second switch 72 performs switching between the decoder 30 and the display 60 under the control of the skip determination unit 40.

 The decoder 30 outputs the decoded audio frame to the speaker 50 through the first switch 70 and outputs the decoded video frame to the display 60 through the second switch 72. In addition, the decoder 30 outputs the decoded audio frame and the video frame to the skip determination unit 40.

The skip determination unit 40 receives the audio frame and the video frame decoded by the decoder, and controls the first and second switches 70 and 72 connected to the decoder 30.

Specifically, the skip determination unit 40 allows the video frames to be selectively output so that the user can quickly search for a desired screen or scene according to the present invention. That is, the user wants to quickly search for a desired screen or scene when playing a video. For example, a user may want to fast forward to a location where sound is output when a video file is played.

The present invention skips and outputs a portion having similar characteristics among video frames so that a user can easily search for a desired playback position or scene. This is based on the video being a collection of consecutive frames. That is, since video is a set of consecutive frames, similarity between adjacent frames is strong in a continuous scene, and similarity between frames is relatively weak in a part where a scene is changed.

Therefore, to extract the scene transition, the continuity of the feature is calculated using the difference between frames for a certain feature of the video, and the discontinuous point is regarded as the scene change.

Accordingly, the skip determination unit 40 grasps the continuity of the predetermined feature of the audio frame or the video frame. That is, the skip determination unit 40 determines whether the predetermined features of the audio frame or the video frame are similar in succession.

The skip determination unit 40 controls the first and second switches 70 and 72 to skip an output of a video frame related to an audio frame having similar characteristics to the previous audio frame or a video frame having similar characteristics to the previous video frame. do.

According to an embodiment, when the skip determination unit 40 receives the video frame output from the decoder 30, the skip determination unit 40 compares the color distribution of the received current video frame with the color distribution of the previous video frame. As a result of the comparison, if the color distribution of the current video frame is similar to the color distribution of the previous video frame, for example, if the difference between the color distribution of the current video frame and the color distribution of the previous video frame is within a threshold range, the skip determination unit 40 Controls the second switch 72 so that the video frame is not output to the display 60.

According to another embodiment, when the skip determination unit 40 receives the audio frame output from the decoder 30, the skip determination unit 40 compares the sound size of the received current audio frame with the sound size of the previous audio frame. As a result of the comparison, if the sound size of the current audio frame is similar to the sound size of the previous audio frame, for example, if the difference between the sound size of the current audio frame and the sound size of the previous video frame is within a threshold range, the skip determination unit 40 The second controller 72 controls the second switch 72 so that the video frame corresponding to the corresponding audio frame is not output to the display 60.

In other words, the skip determination unit 40 outputs a video frame related to an audio frame having a different feature from the previous audio frame or a video frame having a different feature from the previous video frame to the display 60.

In this case, the skip determination unit 40 includes a video frame including a corresponding video frame when a video frame related to an audio frame having a different feature from the previous audio frame or a video frame having a different feature from the previous video frame is output from the decoder 30. Video frames may be output to the display 60 in succession. The number of the plurality of video frames should be such that the user can recognize a scene related to the video frame. Accordingly, the user can select normal playback by stopping the fast forwarding after seeing the portion with the scene change.

In addition, the skip determination unit 40 may selectively output an audio frame corresponding to the video frame to the speaker 50 while selectively outputting the video frame to the display 60. That is, although the audio frame is described as not being output in the embodiment of the present invention, it is apparent that the audio frame may be output according to the setting of the manufacturer or the user who manufactures the video reproducing apparatus.

Embodiments of the present invention illustrate color distribution as a feature of video frames, and sound size as a feature of audio frames. However, the present invention is not limited thereto, and the feature comparison of a video frame may include a difference comparison of a histogram, a difference comparison between pixels, an edge change comparison, a compression correlation coefficient comparison, a similarity measure, and a motion vector comparison. The histogram-based method calculates the histogram difference between each frame using the property that the color distribution of the frames to be classified as the same scene is almost similar, and judges the scene transition when it exceeds the predetermined threshold. In addition, feature comparison of the audio frame may include a comparison of sound wave features of the sound.

In the method of comparing the difference between pixels, the pixels of the screen are compared with the pixels of each frame by using the property that the change is small in the same scene as in the histogram, and when the difference exceeds the threshold, the scene is changed between the frames. Similarity measurement is not a method of comparing individual pixels, but a method of comparing statistical values of corresponding regions in successive frames.In an edge-based method, by identifying key component edges and performing edge-by-frame comparisons between frames, Determine if the object is included in the next frame or how the change is made. In the comparison method of the compression correlation coefficient, a difference between DCT coefficients of consecutive frames is obtained, and a scene change is detected by using the difference. The motion vector comparison method uses a motion vector obtained from MPEG data to recognize scene changes by not only analyzing the motion of a moving object but also recognizing camera movements such as zoom or panning. Detect accurately

The skip determination unit 40 having the above configuration may be integrated into the control unit 10, which is obvious to those skilled in the art.

2 is a flowchart illustrating a video reproducing method for quickly and easily searching for a desired scene among video files in a video reproducing apparatus according to an embodiment of the present invention.

Referring to FIG. 2, when the fast forward mode is executed by the user, the video reproducing apparatus decodes a video frame of the video file in step 210. Subsequently, the video reproducing apparatus compares the production distribution of the current video frame decoded in step 220 with the color distribution of the previous video frame, and determines whether the color distribution of the current video frame is similar to the color distribution of the previous video frame in step 230.

As a result of the determination, if the color distribution of the current video frame is similar to the color distribution of the previous video frame, for example, if the difference between the color distribution of the current video frame and the color distribution of the previous video frame is within the threshold range, the video reproducing apparatus is step 240. Does not output by skipping that video frame.

If the color distribution of the current video frame is different from the color distribution of the previous video frame, for example, if the difference between the color distribution of the current video frame and the color distribution of the previous video frame is out of the threshold range, the video playback device may proceed to step 250. Outputs the corresponding video frame. In this case, the moving picture reproducing apparatus may continuously output a plurality of video frames from video frames having different characteristics from previous video frames. This is because, if only the current video frame which is different from the previous video frame is output, the user cannot recognize the video scene.

3 shows video frames for explaining an embodiment of the present invention. Although only a few frames are shown in FIG. 3 for ease of explanation and illustration, there are typically dozens of video frames corresponding to one second of playback time.

Referring to FIG. 3, first to eighth frames 8 are shown. The first frame 1, the second frame 2, the fourth frame 4, the fifth frame 5, the seventh frame 7 and the eighth frame 8 have similar color distributions.

According to an embodiment of the present invention, the video reproducing apparatus skips and outputs the second frame 2, the fifth frame 5, and the eighth frame 8, which are frames having a color distribution similar to that of the previous frame. I never do that.

Referring back to FIG. 2, the video reproducing apparatus determines whether the fast forward mode has ended in step 260. The movie playback apparatus returns to step 210 if the fast forward mode is not terminated.

In addition, the user may select normal playback by stopping the fast forwarding by looking at the output video frame, that is, the part having a scene change. If the user exits the fast forward mode, the video player may play the video file at a normal speed.

4 is a flowchart illustrating a video reproducing method for quickly and easily searching for a desired scene of a video file in a video reproducing apparatus according to another embodiment of the present invention.

Referring to FIG. 4, when the fast forward mode is executed by the user, the video reproducing apparatus decodes an audio frame of the video file in step 410. In this case, the video reproducing apparatus decodes not only audio frames but also video frames.

Subsequently, the video reproducing apparatus compares the sound size of the current audio frame decoded in step 420 with the sound size of the previous audio frame, and determines whether the sound size of the current audio frame is similar to the sound size of the previous audio frame in step 430.

If it is determined that the sound size of the current audio frame is similar to the sound size of the previous audio frame, for example, if the difference between the sound size of the current audio frame and the sound size of the previous audio frame is within a threshold range, the video playback device may proceed to step 440. Does not output by skipping a video frame corresponding to the corresponding audio frame.

If the sound size of the current audio frame is different from the sound size of the previous audio frame, for example, if the difference between the sound size of the current audio frame and the sound size of the previous audio frame is outside the threshold range, the video playback device may proceed to step 450. Outputs a video frame corresponding to the corresponding audio frame. In this case, the video reproducing apparatus may continuously output a plurality of video frames from video frames corresponding to audio frames having different characteristics from previous audio frames.

FIG. 5 is a diagram illustrating a sound volume over time of audio frames for explaining another embodiment of the present invention.

Referring to FIG. 5A, the sound volume of the audio frame hardly changes in the section indicated by reference numeral 510. In this case, the video reproducing apparatus skips and does not output video frames during this period. In addition, referring to FIG. 5 (b), if the difference between the sound size of the current audio frame and the sound size of the previous audio frame is within a threshold range, that is, the threshold range indicated by reference numeral 520, the corresponding video playback apparatus may be used. The video frame corresponding to the audio frame is skipped and not output.

Although the embodiments described above have been described with regard to fast forward, it will be apparent to those skilled in the art that the present invention can also be applied to fast rewind. Therefore, while the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the present invention described in the claims below. And can be changed.

1 is a block diagram illustrating a video reproducing apparatus according to an embodiment of the present invention.

2 is a flowchart illustrating a video reproducing method for quickly and easily searching for a desired scene among video files in a video reproducing apparatus according to an embodiment of the present invention.

3 is a diagram illustrating video frames for explaining an embodiment of the present invention.

4 is a flowchart illustrating a video reproducing method for quickly and easily searching for a desired scene of a video file in a video reproducing apparatus according to another embodiment of the present invention.

FIG. 5 is a diagram illustrating a sound volume over time of audio frames for explaining another embodiment of the present invention.

Claims (8)

In a device for playing a video file, A decoder for decoding audio and video frames, Upon receiving an audio frame or video frame from the decoder, it is determined whether a predetermined feature of the current audio frame or the current video frame is similar to a predetermined feature of the previous audio frame or the previous video frame, and if similar, the video associated with the current audio frame. And a skip determination unit which skips a frame or a current video frame so that it is not output. The apparatus of claim 1, further comprising: a speaker for outputting the decoded audio frame; And a display on which the decoded video frame is output. The apparatus of claim 1, further comprising a switch configured to switch between the decoder and the display under the control of the skip determination unit. The apparatus of claim 1, wherein the predetermined feature of the video frame is a color distribution of the video frame. The apparatus of claim 1, wherein the predetermined feature of the audio frame is the sound size of the audio frame. In the video playback device to play a video file, Decoding audio frames and video frames, Determining whether a predetermined feature of the current audio frame or the current video frame is similar to a predetermined feature of the previous audio frame or the previous video frame;  And if so, skipping the video frame related to the current audio frame or the current video frame so that it is not output. The method of claim 6, wherein the predetermined feature of the video frame is a color distribution of the video frame. The method of claim 6, wherein the predetermined feature of the audio frame is the sound size of the audio frame.

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