JP2009152807A - Digital broadcast receiver, digital broadcast receiving method, signal processing program, and program recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid video and subtitles becoming difficult to watch owing to frequent movements of the video when the subtitles are superimposed on the video by displaying display of subtitles information to the part where there is no frequent movement of video display, in a digital broadcast receiver for receiving digital broadcast signals. <P>SOLUTION: In the digital broadcast receiver 100, a video decode part 104 for decoding a video information signal is composed so that when decoding the video information signal, an area where the video moves least is identified from among four subtitles display areas Rs1 to Rs4 in a video display area Rv on the basis of a motion vector to be used in decoding the video information signal when decoding the video information signal. In a video output part 107, on the basis of position information advised by a video decoding part, which shows a position where the movement of the video is smallest, decoded video data and decoded subtitles data are synthesized so that subtitles are displayed to the specified area. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus, a digital broadcast receiving method, a signal processing program, and a program recording medium, and in particular, includes a digital broadcast receiving apparatus and a digital broadcast receiving method for displaying captions superimposed on video, and caption information. The present invention relates to a signal processing program for a digital broadcast signal and a program recording medium on which the signal processing program is recorded.

  In digital broadcasting, subtitle information is multiplexed as additional information into a normal video signal and broadcast at the same time as the video signal. Currently, a general digital broadcast receiving apparatus keeps subtitle information specified by a broadcast station. Specifically, it is displayed at the lower position of the display screen for displaying the video and provided to the viewer.

  As a method for displaying a TV program with subtitles, the TV image is compressed in the vertical and horizontal directions so that it is smaller than the display screen, and the compressed TV image is packed in the upper right corner of the display screen. There is also a display that displays subtitles in an L-shaped blank area extending from the left end portion to the lower end portion of the display screen generated by the display (see, for example, Patent Document 1).

Furthermore, in a digital broadcast receiving apparatus that displays a television broadcast program and teletext content on a multi-screen, a system for displaying subtitle information at a position set by the user on the receiving apparatus side has been devised. (For example, refer to Patent Document 2).
Japanese Patent Laid-Open No. 2001-024963 JP 2002-199354 A

  However, if the subtitles are displayed away from the video, the subtitles are difficult to see, and if the subtitles are displayed overlaid on the video display area, both the video and the subtitles can be seen if the video is accompanied by very intense movement. It may be difficult.

  The present invention has been made to solve the above-described problems, and provides a digital broadcast receiving apparatus and a digital broadcast receiving method capable of displaying subtitles at a position that is easy for a viewer to read on a display screen. The purpose is to do.

  The present invention also provides a signal processing program capable of synthesizing video data and subtitle data so that subtitles are displayed at a position that is easy for a viewer to read on the display screen by signal processing of the received digital broadcast signal, and It is an object of the present invention to provide a program recording medium in which the signal processing program is recorded.

  A digital broadcast receiving apparatus according to the present invention is a digital broadcast receiving apparatus that receives a digital broadcast signal and displays video and subtitles, and outputs video data by decoding video information included in the digital broadcast signal A decoding unit; a subtitle decoding unit that decodes subtitle information included in the digital broadcast signal and outputs subtitle data; a video output unit that combines the video data and the subtitle data to output display data; and A video display unit that displays a video based on display data and displays a subtitle superimposed on the video, and the video decoding unit is configured to display the subtitle as a subtitle display region based on the video information. An area detecting unit that detects a portion of the video that does not move strongly and outputs position information indicating the position, and the video output unit is based on the position information. Te, so that the subtitles strenuous part of motion in the video is displayed, which performs the synthesis of the subtitle data and the video data, the objects can be achieved.

  According to the present invention, in the digital broadcast receiving device, the video output unit is configured to display the subtitle data and the video data so that the subtitle is displayed on a portion of the video that does not move strongly based on the position information. A selection generated by a user operation between a first combining process for combining and a second combining process for combining the caption data and the video data so that the caption is displayed in a predetermined portion of the video. It is preferable to switch by a signal.

  According to the present invention, in the digital broadcast receiving apparatus, the video includes an image of a plurality of frames, and the video information includes a pixel value of the image of each frame encoded for each unit region including a plurality of pixels. Video encoded data and a motion vector indicating the magnitude of motion between frames before and after the unit area, and the video decoding unit uses the motion vector to store the video encoded data. It is preferable that the decoding is performed for each unit region, and a portion where the motion of the video is not intense is detected based on the motion vector.

  According to the present invention, in the digital broadcast receiving apparatus, the video includes an image of a plurality of frames, and the video information includes a pixel value of the image of each frame encoded for each unit region including a plurality of pixels. The video decoding unit includes video encoded data, and the video decoding unit decodes the video encoded data for each unit area, and at this time, only the pixel value of the unit area having the video motion in each frame is decoded. It is preferable to detect a portion where the image is updated and the motion of the video is not intense based on the update frequency of the pixel value.

  According to the present invention, in the digital broadcast receiving apparatus, the region detection unit includes the video from a lower position below the center of the display screen on which the video is displayed and an upper position above the center of the display screen. It is preferable to select a direction that does not vigorously move and output position information indicating the selected position as position information of the caption display area.

  According to the present invention, in the digital broadcast receiving apparatus, the area detection unit is configured to detect the video from the right position on the right side of the center of the display screen on which the video is displayed and the left position on the left side of the center of the display screen. It is preferable to select one that does not move strongly and output position information indicating the selected position as position information of the caption display area.

  In the digital broadcast receiving apparatus according to the present invention, the area detection unit includes a lower position below the center of the display screen on which the video is displayed, an upper position above the center of the display screen, and a center of the display screen. From the right position on the right side and the left position on the left side from the center of the display screen, the position where the intensity of the motion of the video is the smallest is selected, and the position information indicating the selected position is displayed in the caption display area It is preferable to output as the position information.

  In the digital broadcast receiving apparatus according to the present invention, when the area detection unit determines a lower position below the center of the display screen on which the video is displayed as the position of the caption display area, the caption display area Is preferably set on the display screen so that the subtitles are displayed at the bottom of the display screen.

  In the digital broadcast receiving apparatus according to the present invention, when the area detection unit determines an upper position above the center of the display screen on which the video is displayed as the position of the caption display area, the caption display area is The subtitles are preferably set on the display screen so that the subtitles are displayed on the upper side of the display screen.

  In the digital broadcast receiving apparatus according to the present invention, when the area detection unit determines the right position on the right side of the center of the display screen on which the video is displayed as the position of the caption display area, the caption display area is The subtitle is preferably set on the display screen so as to be displayed on the right side of the display screen.

  In the digital broadcast receiving apparatus according to the present invention, when the area detection unit determines the left position on the left side from the center of the display screen on which the video is displayed as the position of the caption display area, the caption display area is The subtitles are preferably set on the display screen so that the subtitles are displayed on the left side of the display screen.

  A digital broadcast receiving method according to the present invention is a digital broadcast receiving method for receiving a digital broadcast signal and displaying video and subtitles, wherein the video information is decoded to output video data. A decoding step; a subtitle decoding step for decoding subtitle information included in the digital broadcast signal and outputting subtitle data; a video output step for combining the video data and the subtitle data to output display data; and A video display step of displaying the video based on display data and displaying the video superimposed on the subtitle. In the video decoding step, a subtitle display area in which the subtitle is to be displayed based on the video information As a result, a position where the motion is not intense in the video is detected and position information indicating the position is output. On the basis of the position information, the subtitle data and the video data are combined so that the subtitle is displayed in a portion where the motion of the video is not intense. Achieved.

  According to the present invention, in the digital broadcast receiving method, in the video output step, the subtitle data and the video data are displayed based on the position information so that the subtitle is displayed in a portion where the motion of the video is not intense. A selection generated by a user operation between a first combining process for combining and a second combining process for combining the caption data and the video data so that the caption is displayed in a predetermined portion of the video It is preferably selected by a signal.

  A signal processing program according to the present invention is a signal processing program for causing a computer to perform signal processing for generating display data for displaying video and subtitles from a received digital broadcast signal. A video decoding step for decoding video information included in the video and outputting video data; a subtitle decoding step for decoding subtitle information included in the digital broadcast signal and outputting subtitle data; the video data and the subtitle data; And a video output step for outputting display data by synthesizing the video, and in the video decoding step, a portion of the video that does not move rapidly is detected as a subtitle display region to display the subtitle based on the video information And position information indicating the position is output. In the video output step, based on the position information , So that the subtitles are displayed in strenuous part of motion in the video, which synthesis of the subtitle data and the video data is performed, the object can be achieved.

  According to the present invention, in the signal processing program, in the video output step, the subtitle data and the video data are combined based on the position information so that the subtitle is displayed in a portion where the motion of the video is not intense. A selection signal generated by a user operation, and a first synthesis process for synthesizing the caption data and the video data so that the caption is displayed in a predetermined portion of the video. Is preferably selected.

  The program recording medium according to the present invention records the signal processing program, thereby achieving the above object.

  The operation of the present invention will be described below.

  In the present invention, the decoding unit that decodes the video information included in the digital broadcast signal, based on the video information included in the digital broadcast signal, sets a portion of the video that does not move as a subtitle display region where subtitles are to be displayed. In the video output unit that detects and outputs position information indicating the position, and outputs display data by combining the video data and the caption data, a portion in which the motion is not intense in the video based on the position information The subtitle data and the video data are combined so that the subtitle is displayed on the video display area. can do.

  Further, in the present invention, a first combining process for combining the subtitle data and the video data so that the subtitle is displayed in a portion where the motion of the video is not intense, and a predetermined portion of the video Since the subtitle data and the second synthesizing process for synthesizing the video data are switched by a selection signal generated by a user operation so that the subtitle is displayed, whether the displayed video is intensely moving or not Depending on the characteristics of the video, the display mode in which the subtitle moves to a position where the motion of the video does not move can be canceled to fix the subtitle display position.

  In the present invention, when the subtitle is displayed on the upper side, lower side, right side, or left side from the center of the display screen, the subtitles are displayed at the edges of the screen. It is an area with a low level of attention, and it is possible to relieve the impression that viewers are involved in video with superimposed subtitles and it is difficult to see the video.

  As described above, according to the present invention, in a digital broadcast receiving apparatus that receives a digital broadcast signal and displays video and captions, a decoding unit that decodes video information included in the digital broadcast signal, video data, and caption data And a video output unit that outputs display data, and the decoding unit uses the video information included in the digital broadcast signal as a subtitle display area in which subtitles are to be displayed, so that the motion in the video is not intense. Detecting the portion and outputting position information indicating the position, and the video output unit is configured to display the subtitle data based on the position information so that the subtitle is displayed in a portion of the video where motion is not intense. Since the video data is combined with the video data, even when the video is accompanied by intense motion when displaying the captions superimposed on the video, the portion where the motion of the video is not intense By displaying the subtitles, it is possible to display the subtitle information in an easy-to-read form the viewer.

  According to the present invention, in a digital broadcast receiving method for receiving a digital broadcast signal and displaying video and subtitles, the decoding step of decoding the video information included in the digital broadcast signal is based on the video information included in the digital broadcast signal. As a subtitle display area where subtitles are to be displayed, a position where the motion is not intense is detected and position information indicating the position is output, and display data is output by synthesizing the video data and subtitle data. In the video output step, the subtitle data and the video data are combined based on the position information so that the subtitle is displayed in a portion where the motion of the video is not intense. Even if the video is accompanied by intense movement, the subtitles are displayed on the part where the movement of the video is not intense so that the viewer can easily read it. It is possible to display the subtitle information in the form.

  According to the present invention, in a signal processing program for causing a computer to perform signal processing for generating display data for displaying video and subtitles from a received digital broadcast signal, the video included in the digital broadcast signal In the decoding step for decoding the information, based on the video information included in the digital broadcast signal, a subtitle display area in which the subtitle is to be displayed is detected as a subtitle display area, and position information indicating the position is output. In addition, in the video output step of combining the video data and the caption data and outputting the display data, the caption data is displayed based on the position information so that the caption is displayed in a portion where the motion is not intense in the video. And the video data are combined, so that when the video is accompanied by intense motion when displaying subtitles superimposed on the video Also, by displaying the subtitles to strenuous part of the motion of the video, it can be displayed caption information in readable form viewer.

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

(Embodiment 1)
FIG. 1 is a block diagram illustrating a digital broadcast receiving apparatus according to Embodiment 1 of the present invention.

  The digital broadcast receiving apparatus 100 according to the first embodiment includes an antenna unit 101 that receives a digital broadcast radio wave Ew, a tuner unit 102 that restores the received digital broadcast radio wave Ew to a digital broadcast signal Bs, and a restored digital broadcast signal Bs. And a broadcast signal separation unit 103 that separates and extracts video information Vs, audio information As, subtitle information Cd, and the like. Further, the digital broadcast receiving apparatus 100 decodes the video information Vs and outputs the video data Vd, the audio decoder 105 that decodes the audio information As and outputs the audio data Ad, and the caption information Cs. Subtitle decoder 106 that decodes and outputs subtitle data Cd, video output unit 107 that combines decoded video data Vd and decoded subtitle data Cd to output display data D, and DA-convert audio data Ad The audio DAC unit 108 that outputs the audio signal A, the video display unit 109 such as a liquid crystal display (LCD) that displays video and subtitles based on the display data D, and the audio signal A that receives the audio signal A is output. And a speaker unit 110.

  Further, the digital broadcast receiving apparatus 100 controls the operation unit 100b that generates the operation signal Od by the user's operation, and the tuner unit 102 and the video output unit 107 based on the operation signal Od by the control signals C1 and C2, respectively. And a control unit 100a for controlling.

  Here, the video information Vs includes video encoded data obtained by encoding pixel values of a plurality of frame images constituting the video for each unit area including a plurality of pixels, and a frame between frames before and after the unit area. And a motion vector indicating the magnitude of the motion.

  The video decoder 104 receives the video information Vs, decodes video encoded data included in the video information Vs for each unit region using a motion vector included in the video information Vs, and An area that is detected based on a motion vector used at the time of decoding the encoded video data, detects a non-moving portion of the video as an area to display the caption, and outputs position information Pd indicating the position It has a detector (not shown).

  The area detection unit, as the position information Pd of the area where the caption is to be displayed, is a lower position below the center of the display screen on which the video is displayed, an upper position above the center of the display screen, Position information indicating the position where the intensity of movement is the smallest among the right position from the center and the left position from the center of the display screen is output.

  In addition, the video output unit 107 determines a first synthesis process for synthesizing the subtitle data and the video data so that the subtitle is displayed in a portion where the motion is not intense in the video, and the video is determined. The circuit configuration is such that the subtitle data and the second synthesizing process for synthesizing the video data are switched by the operation of the operation unit 100b by the user so that the subtitle is displayed in the portion. That is, when the operation signal Od is supplied from the operation unit to the control unit 100a by the operation of the operation unit 100b by the user, the control unit 100a sends one of the first and second combining processes to the video output unit 107. The selection signal for selecting is output as the control signal C2. The control unit 100a also outputs a control signal C1 to the tuner unit 102 so that the tuner unit 102 selects a broadcast signal based on a channel switching signal from the operation unit 100b. Note that the control unit 100a actually outputs a control signal to other parts of the digital broadcast receiving apparatus 100, but here, for simplification of description, the control unit 100a includes the tuner unit 102. Other than the control signal C1 and the control signal C2 of the video output unit 107 are omitted.

  The video output unit 107 combines the caption data Cd and the video data Vd based on the position information Pd so that the caption is displayed in a portion where the motion is not intense in the video. is there.

  Furthermore, the audio information As is audio encoded data obtained by compressing and encoding audio data Ad corresponding to the video data Vd by a corresponding encoding method, and the subtitle information Cs corresponds to the video data. This is subtitle encoded data obtained by compressing and encoding subtitle data Cd using a corresponding encoding method.

  The digital broadcast signal is obtained by multiplexing the video information Vs, audio information As, subtitle information Cs and the like together with other data.

  Next, the operation will be described.

  When the broadcast radio wave Ew is received by the antenna unit 101, the received broadcast radio wave Ew is restored to the digital broadcast signal Bs by the tuner unit 102, and the digital broadcast signal Bs is output to the broadcast signal separation unit 103. . Then, the broadcast signal separation unit 103 separates the input digital broadcast signal Bs into video information Vs, audio information As, caption information Ls, and the like, and sends them to the corresponding decoding units 104 to 106.

  Upon receiving the audio information As, the audio decoding unit 105 generates digital audio data Ad by decoding the audio information As and outputs the digital audio data Ad to the audio DAC unit 108. Then, the audio DAC unit 108 outputs an analog audio signal A obtained by DA-converting the digital audio data Ad to the speaker unit 110, and audio is generated by the audio output of the speaker unit 110. The video decoding unit 104 that has received the video information Vs generates video data Vd by decoding the video information Vs, and sends the video data Vd to the video output unit 107. Further, the subtitle decoder unit 106 that has received the subtitle information Cs generates subtitle data Cd by decoding the subtitle information Cs, and sends the subtitle data Cd to the video output unit 107. The video output unit 107 performs video display on the video display unit 109 by combining the received video data Vd and caption data Cd and sending the video display data D to the video display unit 109.

  Here, when the video output unit 107 synthesizes the video data and the subtitle data by the user operation, the subtitle information is displayed at a predetermined position on the display screen of the video display unit 109 where the video is displayed. When the display mode is set, the video output unit 107 synthesizes the data so that caption information is displayed at the bottom of the display screen, as shown in FIG.

  In addition, when the video output unit 107 synthesizes the video data and the caption data, if the adaptive display mode in which the caption is displayed in a portion where the motion of the video is not intense is set, the video decoder unit 104 The position on the display screen where the motion of the video is not intense is specified, and the position where the motion of the video is not severe is notified to the video display unit 109 by the position information Pd. The video display unit 109 receives the video information from the video decoding unit 104 based on the position information Pd indicating the region where the motion of the video is not intense so that the subtitle information is displayed in the region where the motion of the video of the display screen is not severe. Data and caption data are combined.

  As the region where the motion of the video notified from the video decoder unit 104 to the video display unit 109 is not intense, the lowermost lowermost region Rs1 (FIG. 2A) in the video display region (display screen) Rv, the video The uppermost upper leftmost area Rs2 (FIG. 2B) in the display area Rv, the rightmost rightmost area Rs3 (FIG. 2C) in the video display area Rv, and the leftmost leftmost area in the video display area Rv. One region is selected from Rs4 (FIG. 2D).

  When the bottom-padded area Rs1 or the top-padded area Rs2 is selected as the area where the motion of the video is not intense, the horizontal caption is displayed, and when the right-padded area Rs2 or the left-padded area Rs4 is selected. , Vertical subtitles are displayed.

  Next, a method for specifying a position in the video display area Rv where the video motion is not intense in the video decoder unit 104 will be described.

  FIGS. 3A to 3E show a method of specifying a position where the motion of the video is not intense using a motion vector.

  Here, the position where the movement is not intense is that the motion vector corresponding to the plurality of unit areas constituting each area in the upper padded area Rs2, the bottom padded area Rs1, the right padded area Rs3, and the left padded area Rs4 is the most. It means a small area.

  Here, the video decoding unit 104 performs decoding of the video data Vd for each unit area composed of a plurality of pixels in each frame image constituting the video, and the motion vector is the video in the unit area. The direction and the magnitude of the motion are indicated, and a large motion vector is assigned to a unit region with large motion, and no motion vector is assigned to a unit region without motion. Therefore, there is no motion vector for a unit area where there is no motion between each frame and the previous frame. In addition, the bottom justified area Rs1, the top justified area Rs2, the right justified area Rs3, and the left justified area Rs4 include a predetermined number of unit areas.

  Also, the region where the motion of the video display region (display screen) is more intense has more motion vectors. That is, when the video decoding unit 104 has a large motion vector used when decoding video on the video display area Rv, as shown in FIG. In the lower half area of the display screen Rv, an image with intense movement is displayed. In this state, when caption information is displayed in the bottom area Rs1 of the video display area Rv, as shown in FIG. 3 (b), the video with high movement overlaps with the caption, and the video is difficult to see and the caption is difficult to see. turn into.

  Further, as described above, in a state in which a video with intense movement is displayed in the lower half area of the video display screen Rv, as shown in FIG. 3C, the subtitle display is right-justified area Rs3 of the video display area Rv. In addition, as shown in FIG. 3D, even when the caption display is displayed in the left-justified area Rs4 of the video display area, it is difficult to see part of the displayed video and part of the caption. In this way, when a video with intense movement is displayed in the lower half area of the video display screen Rv, as shown in FIG. 3E, the subtitles are displayed in the upper-pad area Rs2 of the video display area Rv. Subtitles can be displayed in a form that is easy for viewers to read.

  Next, subtitle information display processing in this broadcast receiving apparatus will be specifically described with reference to the flowchart shown in FIG.

  The broadcast wave Ew is received by the antenna unit 101 (step S201), and the digital broadcast signal Bs is restored from the broadcast wave Ew by the tuner unit 102 (step S202). Then, the digital broadcast signal Bs is separated into video information Vs, audio information As, caption information Cs, and the like by the broadcast signal separation unit 103 (step S203), and is output to the corresponding decoding unit.

  Then, the video decoding unit 105 decodes the video information Vs, and at that time, specifies a position where the motion of the video is not intense in the video display area Rv. That is, the video decoding unit 105 selects an area with the smallest video motion from among the four caption display areas Rs1 to Rs4 in the video display area Rv based on the motion vector used when decoding the video information Vs. Specify (steps S204 to S206). Then, the video output unit 107 displays subtitles in the area specified by the position information Pd based on the information Pd notified from the video decoding unit 104 and indicating the position where the motion of the video is the smallest. The video data and the caption data are synthesized (steps S207 to S209).

  Specifically, the video decoding unit 105 first determines whether or not a portion located below the center in the video display area (display screen) Rv is an area where the motion of the video is the smallest (step). S204) When the motion of the video is the smallest in this part, the video decoding unit 105 notifies the video output unit 107 of region specifying information (position information) Pd indicating the bottom-up region Rs1 of the video display region Rv (S204). Step S207). Then, the video output unit 107 synthesizes the video data and the subtitle data so that the subtitle is displayed in the bottom-padded region Rs1 based on the region specifying information from the video decoding unit 105. Thereby, the video display unit 109 displays the subtitles in the bottom-up area Rs1 of the video display area Rv (step S211).

  On the other hand, if the result of determination in step S204 is that the motion of the video is not the smallest in the bottom area Rs1, the video decoding unit 105 determines that the part located above the center in the video display area Rv It is determined whether or not the movement is the smallest region (step S205). As a result of the determination, if the motion of the video is the smallest in the portion above the center of the video display area Rv, the video decoding unit 105 notifies the video output unit 107 to that effect (step S208). Then, on the basis of the area specifying information (position information) from the video decoding unit 105, the video output unit 107 displays the video data and the subtitle data so that the subtitles are displayed in the uppermost region Rs2 of the video display region Rv. And synthesize. As a result, the video display unit 109 displays the subtitles in the uppermost region Rs2 of the video display region Rv (step S211).

  As a result of the determination in step S205, if the upper padding area Rs2 is not the area where the video motion is the smallest, the video decoding unit 105 is located on the right side of the center in the video display area Rv (right It is determined whether or not the stuffing area Rs3 is an area where the motion of the video is the slowest (step S206). If the result of this determination is that the video motion is the smallest in the right-justified region Rs3, the video decoding unit 105 notifies the video output unit 107 to that effect (step S209). Then, the video output unit 107 synthesizes the video data and the caption data so that the caption is displayed in the upper pad area Rs3 based on the region specifying information (position information) from the video decoding unit 105. Thereby, the video display unit 109 displays the caption in the right-justified region Rs3 of the video display region Rv (step S211).

  Furthermore, if the result of determination in step S206 is that the right-justified region Rs3 is not the region where the motion of the video is the slowest, the video decoding unit 105 notifies the video output unit 107 to that effect (step S210). ). The video output unit 107 synthesizes the video data and the caption data so that the caption is displayed in the left-justified region Rs4 based on the region specifying information (position information) from the video decoding unit 105. Thereby, the video display unit 109 displays the caption in the left-justified area Rs4 of the video display area Rv (step S211).

  As described above, in the first embodiment, in the digital broadcast receiving apparatus 100, the video decoding unit 104 that decodes the video information included in the digital broadcast signal should be displayed based on the video information included in the digital broadcast signal. The subtitle display area is configured to output a position information indicating the position by detecting a non-moving portion in the video, and a video output unit 107 for synthesizing the video data and the subtitle data is added to the position information. Based on this, the subtitle data and the video data are combined so that the subtitle is displayed in a portion where the motion is not intense in the video. It can be displayed in a manner that is easy for the viewer to see in an overlapping manner on the video display area.

  Further, in the first embodiment, the video output unit 107 performs a first synthesis process for synthesizing the caption data and the video data so that the caption is displayed in a portion where the motion is not intense in the video. Since the subtitle data and the second synthesizing process for synthesizing the video data are switched by a selection signal generated by a user operation so that the subtitle is displayed in a predetermined part of the video, Depending on the characteristics of the video, such as whether the displayed video is intensely moving, the display mode in which the subtitle moves to a position where the motion of the video is not strong can be canceled to fix the display position of the subtitle.

Furthermore, in the first embodiment, when subtitles are displayed on the upper side, lower side, right side, or left side from the center of the display screen, the subtitles are displayed at the edges of the display screen. It becomes an area where the level of attention of the viewer is low, and it is possible to alleviate the impression that the viewer is not able to see the video because the viewer has a lot of subtitles.
(Embodiment 2)
FIG. 5 is a diagram for explaining a digital broadcast receiving apparatus according to Embodiment 2 of the present invention.

  The digital broadcast receiving apparatus according to the second embodiment specifies an area where the motion of the video is not intense (a small motion area) based on the frequency of pixel update instead of the motion vector according to the first embodiment. The configuration is the same as that of the digital broadcast receiving apparatus of the first embodiment.

  That is, the digital broadcast receiving apparatus according to the second embodiment is similar to the digital broadcast receiving apparatus according to the first embodiment. The antenna unit receives a digital broadcast signal, the tuner unit restores the received digital broadcast signal, and the restored digital A broadcast signal separation unit that separates and extracts video information, audio information, subtitle information, and the like from a broadcast signal, a video decoder that decodes the video information, an audio decoder that decodes the audio information, and a subtitle decoder that decodes the subtitle information A video output unit that synthesizes and outputs the decoded video information and the decoded subtitle information, an audio DAC unit that DA-converts the audio data and outputs an audio signal, and a liquid crystal that displays the video data It has a video display unit such as a display (LCD) and a speaker unit that outputs audio by the audio signal. That.

  In the second embodiment, unlike the first embodiment, when the video decoding unit decodes the video information signal, the video display area Rv is updated based on the frequency with which pixel information is updated. It is configured to identify an area with the smallest video motion from among the four subtitle display areas Rs1 to Rs4, and further, the video output unit is notified by the video decoding unit at a position with the smallest video motion. The video data and the caption data are combined so that the caption is displayed in the specified area based on the information indicating the above.

  Here, the pixel value is updated as necessary for each unit region including a plurality of pixels in each frame. In other words, the pixel value is updated only in a plurality of unit areas in each frame where there is a video motion with respect to the corresponding unit area in the previous frame, and the frequency of pixel update in the unit area It is assumed that a display region with a small number means a region where the motion of the video is small.

  Next, the operation will be described.

  When the video decoder decodes the video on the video display area Rv, as shown in FIG. 5A, the pixel is frequently updated in the area extending from the center to the right side of the video display area Rv. If the subtitles are displayed in the bottom area Rs1 below the video display area Rv, as shown in FIG. 5B, the subtitle display overlaps with the area where the pixel update frequency is high, and the video display is difficult to see. Subtitle information is difficult to see. Further, as shown in FIG. 5C, the caption display is displayed on the right-justified area Rs3 on the right side of the video display area Rv, or the caption display is displayed on the upper side of the image in the video display area as shown in FIG. Similarly, when displayed in the filling area Rs2, it is difficult to see part of the video and part of the caption.

  In such a case, as shown in FIG. 5D, the caption display is displayed in the left-justified area Rs4 located on the left side of the video display area Rv, so that the caption information is displayed in a form that is easy for the viewer to read. Can do.

  As described above, in the second embodiment, in the digital broadcast receiving apparatus, the video decoding unit that decodes the video information included in the digital broadcast signal should display subtitles based on the update frequency of the pixel value of each frame in the video. The subtitle display area is configured to detect a portion where the motion is not intense in the video, and the video output unit for synthesizing the video data and the caption data is displayed on the portion where the detected motion is not intense. Thus, since the caption data and the video data are combined, the caption can be displayed on the video display area so as to be easily viewed by the viewer even when the video is accompanied by extremely intense motion. it can.

  In the second embodiment, the video output unit is configured to combine the subtitle data and the video data so that the subtitle is displayed in a portion where the motion of the video is not intense. Since the subtitle data and the second synthesizing process for synthesizing the video data are switched by a selection signal generated by a user operation so that the subtitle is displayed in a predetermined portion of the video, Depending on the characteristics of the video, such as whether or not the video to be moved is intense, the display mode in which the subtitle moves to a position where the motion of the video does not move can be canceled to fix the display position of the subtitle.

  Furthermore, in the second embodiment as well, when subtitles are displayed on the upper side, lower side, right side, or left side from the center of the display screen, they are displayed at the edges of the display screen. Becomes an area where the viewer's attention is low, and the impression that the viewer is not able to see the video due to the subtitled video can be eased.

  In each of the above embodiments, the area detection unit uses the lower position below the center of the display screen on which the video is displayed and the upper position from the center of the display screen as the position information Pd of the area where the caption is to be displayed. Position information indicating the position with the least intensity of movement among the upper position, the right position on the right side of the center of the display screen, and the left position on the left side of the center of the display screen. However, the area detection unit is configured to obtain, as position information Pd of the area where the caption should be displayed, a lower position below the center of the display screen on which the video is displayed and an upper position above the center of the display screen. Among them, a configuration in which position information indicating a position where the intensity of movement is small is output may be used. In addition, the area detection unit may include, as position information Pd of an area in which the caption is to be displayed, a right position on the right side of the center of the display screen on which video is displayed and a left position on the left side of the center of the display screen. The position information indicating the position where the intensity of movement is small may be output.

  Furthermore, in each of the above-described embodiments, when subtitles are displayed on the upper side, lower side, right side, or left side from the center of the display screen, the subtitles are displayed at the edges of the display screen. When displaying on the upper side, lower side, right side, or left side of the center of the screen, it is not always necessary to display at the edge of the display screen, it is on the upper side, lower side, right side, or left side of the display screen, Subtitles may be displayed from the center of the display screen.

  The signal processing for generating display data for displaying video and captions from the received digital broadcast signal in the digital broadcast receiving apparatus of the above embodiment is a computer program for a signal processing program for performing such signal processing. It can also be performed by software.

  Specifically, the signal processing program is recorded on a computer-readable recording medium, and the signal processing program recorded on the recording medium is read into a computer system and executed.

  Here, the computer-readable recording medium refers to a recording medium such as a flexible disk, a magneto-optical disk, and a CD-ROM, and a storage device such as a hard disk device built in the computer system. Furthermore, the computer-readable recording medium includes one that holds the program for a certain period of time, such as a volatile memory inside a computer system that becomes a server when transmitting the program via the Internet.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range from the description of specific preferred embodiments of the present invention based on the description of the present invention and common general technical knowledge. It is understood that the patent documents cited in the present specification should be incorporated by reference into the present specification in the same manner as the content itself is specifically described in the present specification.

  The present invention relates to a digital broadcast receiving apparatus and a digital broadcast receiving method for displaying subtitles superimposed on video, a signal processing program for a digital broadcast signal including subtitle information, and a program recording medium in which the signal processing program is recorded. Subtitles can be presented to viewers in an easy-to-read format, which is useful for television receivers.

FIG. 1 is a block diagram illustrating a digital broadcast receiving apparatus according to Embodiment 1 of the present invention. 2A to 2D are diagrams for explaining the caption display area in the video display area in the digital broadcast receiving apparatus of the first embodiment. FIG. 3A to FIG. 3E are diagrams showing a method of specifying the motion of a video using a motion vector in the digital broadcast receiving apparatus of the first embodiment. FIG. 4 is a diagram for explaining display processing of caption information in the digital broadcast receiving apparatus according to the first embodiment using a flowchart. 5 (a) to 5 (e) are diagrams for explaining a digital broadcast receiving apparatus according to Embodiment 2 of the present invention, showing a method for specifying a region where video motion is not intense based on the frequency of pixel update. ing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Digital broadcast receiver 101 Antenna part 102 Tuner part 103 Broadcast signal separation part 104 Video decoding part 105 Audio decoding part 106 Subtitle decoding part 107 Video output part 108 Audio DAC part 109 Video display part 110 Speaker part Pr Pixel update area Rv Video display Region Rs1 Bottom justified region Rs2 Top justified region Rs3 Right justified region Rs4 Left justified region

Claims (16)

A digital broadcast receiver that receives a digital broadcast signal and displays video and subtitles,
A video decoding unit for decoding video information included in the digital broadcast signal and outputting video data;
A caption decoding unit for decoding caption information included in the digital broadcast signal and outputting caption data;
A video output unit that combines the video data and the caption data to output display data;
A video display unit that displays video and displays subtitles superimposed on the video based on the display data;
The video decoding unit
Based on the video information, as a subtitle display area where the subtitle is to be displayed, an area detection unit that detects a portion of the video that does not move vigorously and outputs position information indicating the position,
The video output unit
A digital broadcast receiving apparatus that synthesizes the caption data and the video data so that the caption is displayed in a portion of the video where the motion is not intense based on the position information. The digital broadcast receiver according to claim 1,
The video output unit, based on the position information, a first synthesis process for synthesizing the caption data and the video data so that the caption is displayed in a portion where the motion in the video is not intense, and the video A digital broadcast receiving apparatus that switches a second synthesis process for synthesizing the caption data and the video data according to a selection signal generated by a user operation so that the caption is displayed in the determined portion. In the digital broadcast receiver according to claim 1 or 2,
The video is composed of a plurality of frames of images,
The video information includes video encoded data obtained by encoding a pixel value of an image of each frame for each unit area composed of a plurality of pixels, and a motion indicating the magnitude of motion between frames before and after the unit area. Vector and
The video decoding unit decodes the video encoded data for each unit area using the motion vector, and detects a portion where the motion of the video is not intense based on the motion vector. Digital broadcast receiver. In the digital broadcast receiver according to claim 1 or 2,
The video is composed of a plurality of frames of images,
The video information includes video encoded data obtained by encoding the pixel value of the image of each frame for each unit region composed of a plurality of pixels.
The video decoding unit decodes the video encoded data for each unit region, and at this time, updates only the pixel value of the unit region having the motion of the video in each frame, and the motion of the video A digital broadcast receiver that detects a non-violent part based on the frequency of updating the pixel value. The digital broadcast receiver according to any one of claims 1 to 4,
The region detecting unit selects a lower position below the center of the display screen on which the video is displayed and an upper position above the center of the display screen, and the one where the movement of the video is not intense, A digital broadcast receiving apparatus that outputs position information indicating a selected position as position information of the caption display area. The digital broadcast receiver according to any one of claims 1 to 4,
The region detecting unit selects a right position on the right side from the center of the display screen on which the video is displayed and a left position on the left side from the center of the display screen, and selects the one that does not move vigorously. A digital broadcast receiver that outputs position information indicating the position as the position information of the caption display area. The digital broadcast receiver according to any one of claims 1 to 4,
The region detection unit includes a lower position below the center of the display screen on which the video is displayed, an upper position above the center of the display screen, a right position on the right side from the center of the display screen, and the display screen A digital broadcast receiving apparatus that selects a position with the least intensity of movement of the video from the left position on the left side from the center, and outputs position information indicating the selected position as position information of the caption display area. The digital broadcast receiver according to claim 5 or 7,
The area detection unit determines the subtitle display area as the position of the subtitle display area, when the lower position below the center of the display screen on which the video is displayed is determined. A digital broadcast receiving apparatus which is set on the display screen so as to be displayed in a packed manner. The digital broadcast receiver according to claim 5 or 7,
When determining the upper position above the center of the display screen on which the video is displayed as the position of the subtitle display area, the area detection unit narrows the subtitle display area to the upper side of the display screen. A digital broadcast receiving apparatus which is set on the display screen so as to be displayed. The digital broadcast receiver according to claim 6 or 7,
When determining the right position on the right side of the center of the display screen on which the video is displayed as the position of the subtitle display area, the area detection unit packs the subtitle display area on the right side of the display screen. A digital broadcast receiving apparatus which is set on the display screen so as to be displayed. The digital broadcast receiver according to claim 6 or 7,
When determining the left position on the left side from the center of the display screen on which the video is displayed as the position of the subtitle display area, the area detection unit packs the subtitle display area on the left side of the display screen. A digital broadcast receiving apparatus which is set on the display screen so as to be displayed. A digital broadcast receiving method for receiving a digital broadcast signal and displaying video and subtitles,
A video decoding step of decoding video information included in the digital broadcast signal and outputting video data;
A subtitle decoding step of decoding subtitle information included in the digital broadcast signal and outputting subtitle data;
A video output step of combining the video data and the caption data to output display data;
A video display step of displaying the video based on the display data and displaying the video with captions superimposed thereon,
In the video decoding step,
Based on the video information, a subtitle display area in which the subtitle is to be displayed is detected as a portion where the motion is not intense in the video and position information indicating the position is output,
In the video output step,
A digital broadcast receiving method in which the caption data and the video data are combined so that the caption is displayed in a portion of the video where the motion is not intense based on the position information. The digital broadcast receiving method according to claim 12,
In the video output step, based on the position information, a first synthesis process for synthesizing the caption data and the video data so that the caption is displayed in a portion where the motion of the video is not intense, and the video A digital broadcast receiving method in which a second combining process for combining the caption data and the video data is selected by a selection signal generated by a user operation so that the caption is displayed in the determined portion. A signal processing program for causing a computer to perform signal processing for generating display data for displaying video and subtitles from a received digital broadcast signal,
A video decoding step of decoding video information included in the digital broadcast signal and outputting video data;
A subtitle decoding step of decoding subtitle information included in the digital broadcast signal and outputting subtitle data;
A video output step of combining the video data and the caption data to output display data;
In the video decoding step,
Based on the video information, a subtitle display area in which the subtitle is to be displayed is detected as a portion where the motion is not intense in the video and position information indicating the position is output,
In the video output step,
A signal processing program in which the caption data and the video data are combined based on the position information so that the caption is displayed in a portion where the motion of the video is not intense. The signal processing program according to claim 14,
In the video output step, based on the position information, a first synthesis process for synthesizing the caption data and the video data so that the caption is displayed in a portion where the motion of the video is not intense, and the video A signal processing program in which a second synthesis process for synthesizing the caption data and the video data is selected by a selection signal generated by a user operation so that the caption is displayed in the determined portion.   A program recording medium in which the signal processing program according to claim 14 or 15 is recorded.

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