Display device, display control method, and program

Abstract

To provide a display device and the like that can suppress deterioration in image quality when performing image processing based on genre information.SOLUTION: A display device includes: a receiving unit that receives at least video data and genre information; an acquisition unit that acquires image quality information corresponding to the genre information; a genre detection unit that detects that the genre information has been changed; and a control unit that, when it is detected that the genre information has been changed, performs control to set image quality of the video data based on the image quality information corresponding to the changed genre information, after a predetermined time has elapsed from the time when the genre information gets changed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a display device, a display control method, and a program. [Background technology]

[0002] Patent Document 1 discloses a technique for detecting the genre of a program being displayed on a television set and causing the television set to execute a type of brightness processing stored in association with the detected genre. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-111916 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, in multiplexed broadcast waves, the video data and genre information of a program are not synchronized. Furthermore, when a program changes, the genre information is transmitted before the program changes. Therefore, the television detects the change in genre information before the video data of the program changes.

[0005] If a television detects a change in genre information and performs image processing using image quality settings (e.g., brightness settings) based on the genre information of the program after the change, the image processing will not be optimal. In other words, even though the video data displayed on the television is the video data before the program change, the video data will be image processed using the image quality settings of the next program. In this case, the image processing will not be performed using the optimal image quality settings, and the image quality of the displayed image will deteriorate. Patent Document 1 does not solve this problem.

[0006] In one aspect, an object of the present disclosure is to provide a display device or the like that can suppress degradation in image quality when performing image processing based on genre information. [Means for solving the problem]

[0007] A display device according to one embodiment of the present invention comprises a receiving unit that receives at least video data and genre information, an acquiring unit that acquires image quality information corresponding to the genre information, a genre detection unit that detects that the genre information has been changed, and a control unit that, when it is detected that the genre information has been changed, controls the image quality of the video data to be set based on the image quality information corresponding to the changed genre information after a predetermined time has elapsed from the time the genre information was changed. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram illustrating an example of a television according to a first embodiment. [Figure 2] FIG. 10 is a diagram showing an example of a table showing the correspondence between genres and image quality parameters. [Figure 3A] FIG. 10 is a diagram illustrating an example of a conventional change in image quality setting. [Figure 3B] FIG. 10 is a diagram showing an example of changing image quality settings to which the first embodiment is applied. [Figure 4] 4 is a flowchart showing an example of a processing flow according to the first embodiment. [Figure 5] FIG. 10 is a diagram showing an example of changing image quality settings to which the second embodiment is applied. [Figure 6] 10 is a flowchart showing an example of a processing flow according to a second embodiment. [Figure 7] FIG. 11 is a diagram showing an example of changing image quality settings to which the third embodiment is applied. [Figure 8] 11 is a flowchart showing an example of a processing flow according to a third embodiment. [Figure 9] FIG. 13 is a diagram illustrating an example of a television according to a sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment The first embodiment will be described below. Fig. 1 is a diagram showing an example of a television 100 according to the first embodiment. The television 100 (display device) includes a processing unit 101, a receiving unit 102, a storage unit 103, a connection unit 104, a speaker 105, a display unit 106, a network interface 107, and a remote control signal receiving unit 108. The television 100 may have a different configuration, or some of the configuration shown in Fig. 1 may be omitted.

[0010] The processing unit 101 includes a control unit 111, a genre detection unit 112, an image processing unit 113, an acquisition unit 114, and a playback unit 115. The processing unit 101 is a computer that executes various processes in each embodiment. The processing unit 101 has a processor and a memory. The processor of the processing unit 101 executes a plurality of instruction sets (programs) stored in the memory, thereby realizing various controls in each embodiment. Any processor such as a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), or an FPGA (Field Programmable Gate Array) can be used as the processor.

[0011] The above-described programs are stored in a non-transitory recording medium such as a semiconductor medium, an optical recording medium, or a magneto-optical recording medium. The programs stored in the recording medium are executed by the processing unit 101, thereby realizing various controls of each embodiment. The above-described programs may also be acquired by the television 100 from an external server via a network.

[0012] The receiving unit 102 includes, for example, a tuner. The receiving unit 102 receives broadcast waves distributed by broadcasting equipment of one or more broadcasters and performs predetermined signal processing. The broadcast waves may include multiple programs distributed by the broadcasters. The receiving unit 102 receives the broadcast waves wirelessly or via a cable. The broadcast waves include terrestrial broadcasts (terrestrial digital television broadcasts) and satellite broadcasts. Satellite broadcasts include BS (Broadcasting Satellites) broadcasts, CS (Communication Satellites) broadcasts, and new 4K8K satellite broadcasts.

[0013] The storage unit 103 stores various types of information. For example, the storage unit 103 stores image quality parameters as image quality information related to image quality settings suitable for the video displayed on the display unit 106. The storage unit 103 may also store other information.

[0014] The connection unit 104 is connected to an external recording device 121. The external recording device 121 is a recording device that records program data received by the television 100. The external recording device 121 is a USB (Universal Serial Bus) hard disk, recorder, or the like.

[0015] The processing unit 101 can record the program data received by the receiving unit 102 in the external recording device 121 via the connection unit 104. The processing unit 101 also reads out the program data recorded in the external recording device 121 via the connection unit 104 and plays back the read program data. The external recording device 121 may be, for example, a recording device built into the television 100.

[0016] The speaker 105 is a device that outputs audio. The display unit 106 is a device that displays video. Video of a program received by the receiving unit 102 is displayed on the display unit 106, and audio corresponding to the video is output from the speaker 105. The same applies when program data recorded in the external recording device 121 is played back.

[0017] The network interface 107 is connected to an external server via the Internet. The television 100 can acquire, for example, video data from the external server. Details will be described later.

[0018] The remote control signal receiving unit 108 receives a signal from a remote controller used to operate the television 100. The remote control signal receiving unit 108 outputs the received signal to the processing unit 101.

[0019] The control unit 111 of the processing unit 101 performs various controls in each embodiment. The genre detection unit 112 detects genre information and, if the genre information is changed, detects the change in genre information. Details of genre information will be described later. The image processing unit 113 performs image processing of the video data with image quality settings (image quality parameters) suitable for the video displayed on the display unit 106.

[0020] The acquisition unit 114 acquires image quality parameters suitable for the video displayed on the display unit 106 from the storage unit 103. The playback unit 115 reads out program data recorded in the external recording device 121 and performs processing to play back the read program data.

[0021] Video data and genre information are multiplexed in the information about a program in the broadcast waves received by the receiving unit 102. The genre information indicates the genre of the program. Genres include, for example, sports, news, drama, etc.

[0022] Image processing unit 113 performs image processing on the video data using image quality parameters for image quality settings according to the video data of the program. The image quality parameters for performing suitable image processing differ depending on the genre of the program. For example, the optimal image quality parameters for a sports genre are different from the optimal image quality parameters for a news genre. However, the same image quality parameters may be used even for different genres.

[0023] Fig. 2 is a diagram showing an example table of correspondence relationships between genres and image quality parameters. For example, in the example of Fig. 2, when the genre is sports, the image quality parameters used in image processing of the video data are brightness A1, saturation B1, and hue C1.

[0024] When the genre corresponding to the video displayed on display unit 106 is sports, acquisition unit 114 reads out the example table of Fig. 2 stored in storage unit 103 and acquires image quality parameters corresponding to the genre of sports. Image processing unit 113 then performs image processing on the video data using the acquired image quality parameters.

[0025] The same applies when the genre is news or when the genre is drama. Acquisition unit 114 acquires image quality parameters corresponding to the genre information, and image processing unit 113 performs image processing on the video data using the acquired image quality parameters, so that an appropriate video according to the genre is displayed on display unit 106.

[0026] Examples of genres and image quality parameters are not limited to the examples in Fig. 2. For example, a genre such as a movie may be applied as the genre. For example, contrast, sharpness, noise reduction, etc. may be applied as the image quality parameters.

[0027] The following describes a case where a program on a broadcast wave is switched. The video data and genre information of the program multiplexed onto the broadcast wave received by the receiving unit 102 are not synchronized. In addition, the genre information is transmitted on the broadcast wave prior to the video data.

[0028] The genre detection unit 112 detects the genre of a program based on the genre information multiplexed on the broadcast wave received by the receiving unit 102. As described above, the genre information is transmitted prior to the video data. Therefore, when switching between programs of different genres, the genre detection unit 112 detects the change in program genre before the video data is switched.

[0029] Conventional televisions change the image quality parameters of the image processing applied to video data when a change in genre is detected. In this case, even though the video displayed on the television is video from the previous program, the video data of that video is subjected to image processing using the image quality parameters of the next program. In this case, the image quality may not be optimal because image processing is performed using image quality parameters that are not suitable for the video data.

[0030] 3A is a diagram showing an example of a conventional picture quality setting change. Before time T1, the television is receiving video data and genre information for Program A. The genre of Program A is assumed to be sports, and the genre of Program B is assumed to be news.

[0031] At time T1, which is before time T2 when the video data of program A is switched to the video data of program B, the genre information received by the television is switched from the genre information of program A to the genre information of program B. As a result, the television detects the change in genre information at time T1.

[0032] At time T1 when a change in genre information is detected, the conventional television changes the image quality parameters of the image processing applied to the video data from the image quality parameters of program A to the image quality parameters of program B.

[0033] In this case, the video displayed on the television from time T1 to T2 is program A, but the video data of that video is subjected to image processing using the image quality parameters of program B. In the above example, the video displayed from time T1 to T2 is a sports program, but the video data of that video is subjected to image processing using the image quality parameters of news.

[0034] Therefore, between times T1 and T2, the video data is not subjected to suitable image processing, and the video displayed on the television is not of optimal quality. This causes users watching television to feel uncomfortable with the picture quality between times T1 and T2. As a result, the picture quality deteriorates between times T1 and T2.

[0035] 3B is a diagram showing an example of changing image quality settings when the first embodiment is applied. Before time T1, the receiving unit 102 receives video data and genre information for program A, and the display unit 106 displays video data that has been image processed using the image quality parameters of program A. At time T1, the genre information received by the receiving unit 102 switches from the genre information for program A to the genre information for program B.

[0036] At time T1, genre detection unit 112 detects that genre information has changed. In this embodiment, upon detecting that genre information has changed, control unit 111 controls image processing unit 113 not to change the image quality parameters applied, but to maintain the image quality parameters applied to program A.

[0037] The control unit 111 starts counting time from the point when the genre detection unit 112 detects a change in genre information, and after a predetermined time TW has elapsed, the image processing unit 113 changes the image quality parameters to be applied to the image quality parameters of program B. The predetermined time TW will be described later.

[0038] This allows the timing at which the image quality parameters for image processing applied to video data are changed to be closer to the timing at which the video data of the program is switched when the genre information received by the receiving unit 102 of the television 100 is changed.

[0039] In the example of FIG. 3B , between times T1 and T3, even if the genre detection unit 112 detects a change in genre, the control unit 111 maintains the image quality parameters of the image processing performed by the image processing unit 113 at the image quality parameters of program A. Here, the control unit 111 can change the image quality parameters applied to the same program depending on the scene. The video data of one program is made up of multiple scenes (frames), each with different video features. The control unit 111 analyzes the video features of each scene included in the video data and changes the image quality parameters corresponding to the genre information of program A depending on the video features of each scene. In other words, multiple image quality parameters can be applied to one program. Since the image quality parameters (image quality parameters of the image processing applied to the video data of program A) change depending on the scene, the image quality of the video data can be improved. This is also true for each embodiment other than this embodiment.

[0040] If the genre of program A is sports and the genre of program B is news, between times T1 and T3, under the control of control unit 111, image processing unit 113 performs image processing on the video data of the sports program using the image quality parameters of sports.

[0041] This prevents degradation of the image quality of the video displayed on display unit 106 until time T3. In other words, the time during which degradation of image quality occurs due to a change in genre information is shortened.

[0042] Here, control unit 111 may read out the image quality parameters of program B from storage unit 103 in advance before time T3 (the time when a predetermined time TW has elapsed since the change in genre information was detected). This allows image processing unit 113 to quickly apply image processing to the video data using the image quality parameters of program B at time T3. Note that control unit 111 may read out the image quality parameters of program B from storage unit 103 at time T3.

[0043] Here, the above-mentioned predetermined time TW will be explained. Genre information in the broadcast waves from the broadcasting equipment of the broadcaster is transmitted at a predetermined retransmission interval. For example, the genre information is transmitted at a predetermined transmission interval by a packet called an EIT (Event Information Table).

[0044] For example, the ARIB (Association of Radio Industries and Businesses) operational standards prescribe the transmission interval of EIT packets for each broadcast wave of terrestrial digital television broadcasting, BS broadcasting, and CS broadcasting. For example, the default value for terrestrial digital television broadcasting is 1 second (minimum 1 second, maximum 3 seconds). The default value for BS broadcasting is 3 seconds (minimum 1 second, maximum 3 seconds). The default value for CS broadcasting is 1 second (minimum 1 second, maximum 3 seconds).

[0045] The control unit 111 sets the predetermined time TW as the transmission interval of the EIT packets. The control unit 111 may change the setting of the predetermined time TW depending on the type of broadcast wave of the video displayed on the display unit .

[0046] For example, if the video displayed on display unit 106 is a terrestrial digital television broadcast or a CS broadcast, control unit 111 sets the predetermined time TW to 1 second. Also, if the video displayed on display unit 106 is a BS broadcast, control unit 111 sets the predetermined time TW to 3 seconds.

[0047] As described above, the predetermined time TW can be set according to the transmission interval of EIT packets in the broadcast wave of the video displayed on the display unit 106. The predetermined time TW may be set based on any criterion other than the EIT packet.

[0048] Fig. 4 is a flowchart showing an example of the processing flow of the first embodiment. The flowchart in Fig. 4 is executed when video data of a program broadcast by the receiving unit 102 is displayed on the display unit 106.

[0049] The control unit 111 determines whether the genre detection unit 112 has detected that the genre information received by the receiving unit 102 has been changed (step S101). If the genre detection unit 112 has not detected that the genre information has been changed, the control unit 111 determines No in step S101 and returns the process to step S101. In this case, the processes from step S102 onwards are not performed until the genre detection unit 112 detects that the genre information has been changed.

[0050] If the genre detection unit 112 detects that the genre information has been changed, the control unit 111 determines "Yes" in step S101 and proceeds to step S102. The control unit 111 starts counting time (step S102). The control unit 111 may count time using, for example, a software timer or a hardware timer. Before step S102 is executed, the count time is set to an initial value (zero).

[0051] Control unit 111 determines whether a predetermined time TW has elapsed since the start of counting (step S103). If the predetermined time TW has not elapsed, control unit 111 determines No in step S103 and returns the process to step S103. In this case, control unit 111 maintains the settings of the image quality parameters of image processing unit 113 without changing them. As described above, the image quality parameters applied within one program may change depending on the scene.

[0052] If a predetermined time TW has elapsed since the start of counting, control unit 111 determines Yes in step S103 and proceeds to step S104. Control unit 111 changes the image quality parameters applied to image processing unit 113 to the image quality parameters of the genre of the next program (program B) acquired by acquisition unit 114 (step S104). After the processing of step S104, control unit 111 ends the flowchart of FIG.

[0053] As described above, in this embodiment, control unit 111 performs image processing using image quality parameters according to the new program genre after a predetermined time TW has elapsed since the time the genre change was detected, rather than at the time the genre change was detected. This makes it possible to shorten the time it takes for image quality to deteriorate when image processing is performed on the video data of the currently displayed program using image quality parameters of the genre information of the next program.

[0054] Second Embodiment Next, a second embodiment will be described. In the second embodiment, the control unit 111 controls the image processing unit 113 to perform smoothing processing from time T3 after a predetermined time TW has elapsed since time T1 when a change in genre information was detected.

[0055] Smoothing processing is processing that changes the image quality in stages. Fig. 5 is a diagram showing an example of changing the image quality setting when the second embodiment is applied. In the first embodiment, the control unit 111 changes the image quality parameters applied by the image processing unit 113 from the image quality parameters of program A to the image quality parameters of the next program B at time T3.

[0056] In the second embodiment, the control unit 111 acquires the image feature of the video data at time T3, and gradually changes the image quality parameters starting from the image quality parameter corresponding to the image feature toward the image quality parameter of the genre information of the next program B.

[0057] Control unit 111 may change the image quality parameters applied to the same program depending on the scene. For example, in the example of Fig. 5, control unit 111 controls so that image processing is performed using the image quality parameters of program A until time T3.

[0058] On the other hand, the video data of program A is made up of multiple scenes (frames), each with a different video feature. The control unit 111 analyzes the video feature of each scene included in the video data and changes the image quality parameters corresponding to the genre information of program A according to the video feature of each scene. Since the image quality parameters (image quality parameters of the image processing applied to the video data of program A) change according to the scene, the image quality of the video data can be improved. This is also true for each embodiment other than the second embodiment.

[0059] When changing the image quality parameters, control unit 111 sets the image quality parameters corresponding to the video feature amounts of the scene in the video data of program A at time T3, which is a predetermined time TW after time T1, rather than at time T1. Control unit 111 then performs a process (smoothing process) to gradually change the image quality parameters from the image quality parameters applied at time T3 toward the image quality parameters of the next program B.

[0060] Any method, such as linear interpolation, may be applied to the smoothing process. Control unit 111 may keep the degree of gradual change in the image quality parameter when applying the smoothing process constant or may vary. For example, control unit 111 may gradually increase the degree of change in the image quality parameter from time T3 to time T2.

[0061] 6 is a flowchart showing an example of the processing flow of the second embodiment. The processing from steps S101 to S103 is the same as in the first embodiment, so the description will be omitted. When the control unit 111 determines that a predetermined time TW has elapsed since the start of time counting, the control unit 111 advances the processing to step S201.

[0062] Control unit 111 performs the smoothing process described above (step S201). As a result, after a predetermined time TW has elapsed since a change in genre was detected, the image quality parameters applied to image processing unit 113 are changed in stages. After the process of step S201, control unit 111 ends the flowchart in FIG. 6.

[0063] As described above, in this embodiment, the control unit 111 performs a smoothing process to gradually change the image quality parameters that were applied at time T3, when a predetermined time TW has elapsed since it was detected that the genre information had been changed, toward the image quality parameters of the next program.

[0064] This allows the image quality parameters applied when image processing unit 113 processes the video data to be changed in stages, and therefore the image quality of the video data is also changed in stages. This reduces the sense of discomfort felt by the user compared to when the image quality parameters applied to image processing unit 113 are changed immediately.

[0065] Third Embodiment Next, a third embodiment will be described. As described above, EIT packets of genre information distributed by a broadcaster are transmitted at retransmission intervals according to the broadcast waves. Here, if the reception status of the EIT packets becomes unstable due to noise or the like, for example, there is a possibility that the EIT packets will be processed at intervals shorter than the retransmission interval.

[0066] In this case, the receiving unit 102 receives new genre information before the predetermined time TW has elapsed since receiving the genre information. In this case, changes in genre information are detected more frequently, and image quality settings may be changed more frequently. As a result, for example, the image displayed on the display unit 106 may flicker.

[0067] In the third embodiment, if the control unit 111 detects a new change in genre information before a predetermined time TW has elapsed since the genre detection unit 112 detected a change in genre information, the control unit 111 sets the standard for counting the predetermined time TW to the time point at which the new change in genre information is detected.

[0068] 7 is a diagram showing an example of a change in image quality settings when the third embodiment is applied. At time T1, genre detection unit 112 detects a change in genre information. Control unit 111 starts counting time and does not change the image quality parameters applied to image processing unit 113 until a predetermined time TW has elapsed.

[0069] Assume that the genre detection unit 112 detects a new change in genre information at time T4, which is a predetermined time TW after time T1 and before time T3. In this case, the control unit 111 initializes the count time.

[0070] As a result, at time T2, which is a predetermined time TW after time T4 when genre detection unit 112 detects a new change in genre information, control unit 111 changes the image quality parameters to be applied to image processing unit 113 to the image quality parameters of program B. If genre detection unit 112 detects another change in genre information before time T2, control unit 111 initializes the count time.

[0071] When the reception status of EIT packets is unstable, if the genre detection unit 112 detects a new change in genre information before the predetermined time TW has elapsed since detecting the change, the count of the predetermined time TW is initialized. Therefore, the image quality setting is not changed at time T3, and is changed at time T2. As a result, even when the reception status of EIT packets is unstable, frequent changes in the image quality setting are suppressed.

[0072] 8 is a flowchart showing an example of the processing flow of the third embodiment. The processing of steps S101 to S104 is the same as that of the first embodiment, and therefore description thereof will be omitted. If the control unit 111 determines in step S103 that the predetermined time TW has not elapsed since the start of time counting, the control unit 111 advances the processing to step S301.

[0073] The control unit 111 determines whether the genre detection unit 112 has detected a change in genre information (step S301). If the genre detection unit 112 has not detected a change in genre information, the control unit 111 determines No in step S301 and returns the process to step S103. In this case, the determination in step S103 and the determination in step S301 are repeated.

[0074] If the genre detection unit 112 detects a change in genre information, the control unit 111 determines Yes in step S301 and proceeds to step S302. In this case, the change in genre information is detected before the predetermined time TW has elapsed since the start of time counting. The control unit 111 initializes the count time (step S302).

[0075] After executing step S302, control unit 111 returns the process to step S102. Control unit 111 starts counting time from the initialized state. As a result, the time at which the image quality setting is changed becomes time T2, not time T3 in the example of FIG. 7.

[0076] As described above, in the third embodiment, the control unit 111 initializes the count time if the control unit 111 detects a new change in genre information before a predetermined time TW has elapsed since the genre detection unit 112 detected a change in genre information.

[0077] Then, after a predetermined time TW has elapsed since the control unit 111 detected a new change in genre information, the control unit 111 changes the image quality parameters to be applied to the image processing unit 113 to the image quality parameters of the next program. However, if another change in genre information is detected before the predetermined time TW has elapsed since the control unit 111 detected a new change in genre information, the control unit 111 initializes the count time.

[0078] This prevents frequent changes to the image quality settings due to unstable reception of EIT packets, etc.

[0079] <Fourth embodiment> Next, a fourth embodiment will be described. Program data of a broadcast wave received by the receiving unit 102 can be recorded in an external recording device 121. For example, when a user issues a recording instruction by operating a remote controller, the remote control signal receiving unit 108 receives the recording instruction from the remote controller. Based on the recording instruction, the control unit 111 causes the program data to be recorded in the external recording device 121. Furthermore, when a function such as scheduled recording is used, the control unit 111 records the specified program data in the external recording device 121 at a specified time.

[0080] The program data recorded in the external recording device 121 is recorded in the external recording device 121 in a format called partial TS (Transport Stream), for example. A partial TS is a group of packets constructed from packets necessary for playing back program data, selected from TS packets of normal broadcast waves.

[0081] Program data recorded in the external recording device 121 in the form of a partial TS also includes genre information, just like the broadcast waves received by the receiving unit 102. This genre information is not synchronized with the video data of the program data. Furthermore, the timing at which the genre information changes precedes the timing at which the video data changes. For this reason, if the image quality parameters are changed to those of the next program when a change in genre information is detected, the above-mentioned problem occurs.

[0082] For example, suppose that a user uses a remote controller to perform an operation to play program data recorded in the external recording device 121. A play instruction for the designated program data is transmitted from the remote controller. The remote control signal receiving unit 108 receives the play instruction. The remote control signal receiving unit 108 outputs the received play instruction to the processing unit 101.

[0083] Based on the playback instruction, the playback unit 115 reads out the specified program data from the external recording device 121 via the connection unit 104. In this case, the connection unit 104 functions as a receiving unit. The playback unit 115 then controls the playback of the read program data. The playback unit 115 displays the video of the program data on the display unit 106 and outputs the audio of the program data from the speaker 105.

[0084] While the playback unit 115 controls the playback of the program data, the control unit 111 performs the control described above in the first embodiment. Specifically, the control unit 111 performs each process in the flowchart of FIG.

[0085] As described above, the program data recorded in the external recording device 121 includes video data and genre information. Furthermore, the video data and genre information are not synchronized. Therefore, while the playback unit 115 is playing back the program data, the control unit 111 determines whether the genre detection unit 112 has detected a change in the genre information.

[0086] When a change in genre information is detected, control unit 111 starts counting time. Control unit 111 does not change the image quality parameters until a predetermined time TW has elapsed since the change in genre information was detected. After the predetermined time TW has elapsed since the change in genre information was detected, control unit 111 changes the image quality parameters to be applied to image processing unit 113 to the image quality parameters of the next program.

[0087] As a result, the same effects as those of the first embodiment can be obtained when playing back program data recorded in the external recording device 121. The fourth embodiment can also be applied to the second and third embodiments.

[0088] Fifth Embodiment Next, a fifth embodiment will be described. The broadcast waves received by the receiving unit 102 include program information related to the programs. The control unit 111 generates an electronic program guide (EPG) based on the program information received by the receiving unit 102. The electronic program guide is generated by arranging programs in chronological order for each channel (broadcaster). For example, the electronic program guide includes information on each program distributed by each broadcaster for each week.

[0089] The electronic program guide includes information on the start time and length of each program. The control unit 111, for example, stores the electronic program guide in the storage unit 103. The electronic program guide may be obtained from an external server via the network interface 107, for example, via the Internet.

[0090] Here, the control unit 111 may set the predetermined time TW described in the first embodiment based on an electronic program guide. As described above, the electronic program guide includes information on the start time and program length. The control unit 111 sets the predetermined time TW based on the start time of each program included in the electronic program guide. Note that if the electronic program guide includes information on the end time of a program, the control unit 111 may set the predetermined time TW based on the end time of the program included in the electronic program guide.

[0091] 3B, the control unit 111 sets the predetermined time TW to be the time from time T1 when a change in genre information is detected to time T2. Time T2 is the time when the video data of program A is switched to the video data of program B, and can be recognized from the time when the program starts in the electronic program guide.

[0092] This allows the time when control unit 111 changes the image quality parameters applied to image processing unit 113 to coincide with the time when the video data switches. In this case, image processing using the image quality parameters of the genre information of the next program will not be performed on the video data of the currently displayed program, so there will be no degradation in image quality.

[0093] On the other hand, the program guide data is information different from the genre information multiplexed onto the broadcast waves. When setting the predetermined time TW based on the program guide data, the control unit 111 executes, for example, a predetermined application to read and decode the program guide data stored in the storage unit 103.

[0094] This reduces the efficiency of the processing, as the control unit 111 must perform image processing of the video data and processing related to the program guide data in real time based on the broadcast waves received by the receiving unit 102. In other words, when the control unit 111 performs the various processes described above, it is more efficient to perform the processing in real time based on the genre information included in the distributed program guide data than to perform the processing using the program guide data.

[0095] Therefore, for example, it may be possible to select whether to set a process that uses program guide data or a process that does not use program guide data. For example, the user may be able to select the above setting on the television 100 using a remote controller. Furthermore, when the television 100 is shipped, either a process that uses program guide data or a process that does not use program guide data may be set. When program guide data is not used, the predetermined time TW is set to the transmission interval of the EIT packet described in the first embodiment.

[0096] As described above, in the fifth embodiment, the control unit 111 sets the predetermined time TW using the program guide data, so that image processing using the image quality parameters of the genre information of the next program is not performed on the video data of the currently displayed program, and therefore, degradation of image quality does not occur. The fifth embodiment can also be applied to the fourth embodiment.

[0097] Sixth Embodiment Next, a sixth embodiment will be described. Fig. 9 is a diagram showing an example of a television 100 according to the sixth embodiment. In the example of Fig. 9, an external recording device 131 is connected to the television 100. The external recording device 131 in the example of Fig. 9 is different from the external recording device 121 in the example of Fig. 1.

[0098] 9 is a recorder capable of writing to and reading from optical discs, such as a Blu-ray (registered trademark) recorder. The external recording device 131 and the connection unit 122 of the television 100 are connected by, for example, an HDMI (High-Definition Multimedia Interface, HDMI is a registered trademark) cable. Therefore, both the television 100 and the external recording device 131 are HDMI-compatible devices.

[0099] The HDMI cable includes an AV signal transmission path 123A and a CEC (Consumer Electronics Control) signal transmission path 123B. The AV signal transmission path 123A is a first transmission path that transmits video data and audio data. The CEC signal transmission path 123B is a second single-wire serial transmission path defined by the HDMI-CEC standard. Communication that recognizes EDID (Extended Display Identification Data) is possible between the television 100 and the external recording device 131 via the CEC signal transmission path 123B.

[0100] The control unit 111 of the television 100 controls the receiving unit 102 to record the program data of the broadcast waves received in the external recording device 131 via the HDMI cable. As a result, the program data of the broadcast waves received by the television 100 is recorded in the external recording device 131.

[0101] In the sixth embodiment, similarly to the fourth embodiment, the playback unit 115 reads out program data recorded in the external recording device 131 via the connection unit 122. In this case, the connection unit 122 functions as a receiving unit. The playback unit 115 controls the playback of the program data. In the sixth embodiment, the video data is transmitted via an AV signal transmission path 123A, and the genre information is transmitted via a CEC signal transmission path 123B. The video data and the genre information are not synchronized.

[0102] Therefore, in the sixth embodiment, the same processing as in the first embodiment is performed. When a change in genre information is detected, the control unit 111 starts counting time. The control unit 111 does not change the image quality parameters until a predetermined time TW has elapsed since the change in genre information was detected. After the predetermined time TW has elapsed since the change in genre information was detected, the control unit 111 changes the image quality parameters to be applied to the image processing unit 113 to the image quality parameters of the next program.

[0103] As a result, the same effects as those of the first embodiment can be obtained when playing back program data recorded in the external recording device 131 via an HDMI cable. The sixth embodiment can also be applied to the second and third embodiments.

[0104] <Modification> In the above-described fourth embodiment, program data of a broadcast wave received by the receiving unit 102 of the television 100 is recorded in the external recording device 131. Then, when the playback unit 115 plays back the program data recorded in the external recording device 131, the control unit 111 performs the various processes described in the fourth embodiment.

[0105] For example, the fourth embodiment is also applicable to a case where the program data recorded in the external recording device 131 is not broadcast program data but video data (content). The content is provided by, for example, an external server connected via the Internet. For example, the television 100 obtains the content from the network interface 107 via the Internet, and the obtained content is recorded in the external recording device 131. Alternatively, the content may be recorded in the external recording device 131 not via the television 100 but via, for example, a personal computer.

[0106] A content may contain multiple pieces of video data. In this case, genre information may be included in the content for each piece of video data. In addition, there may be cases where the video data and genre information for each piece of video data are not synchronized.

[0107] In such a case, when the playback unit 115 plays back multiple pieces of video data included in the content, the control unit 111 performs the various processes of the fourth embodiment, thereby achieving the same effect as in the fourth embodiment. Even when the content is recorded on the external recording device 131 connected to the television 100 via HDMI, as in the sixth embodiment, the control unit 111 performs the various processes of the sixth embodiment, thereby achieving the same effect as in the sixth embodiment.

[0108] Furthermore, the content may be, for example, content distributed by an external server. For example, the television 100 is connected to the external server via the Internet through the network interface 107. The television 100 can stream the content distributed by the external server.

[0109] When the content to be streamed includes multiple pieces of video data, each of which is associated with genre information, the control unit 111 can perform the various processes of the fourth or sixth embodiment described above. The content is acquired from an external server, not from the external recording device 121 or the external recording device 131. In this case, the network interface 107 functions as a receiving unit.

[0110] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. Furthermore, the order of the processes in the flowcharts described in the above-described embodiments can be changed as much as possible.

[0111] A program that realizes the functions of each embodiment is stored in a non-transitory recording medium such as a semiconductor medium, an optical recording medium, or a magneto-optical recording medium. For example, a non-volatile memory card may be used as the semiconductor medium. For example, a CD (Compact Disc) or a DVD (Digital Versatile Disc) may be used as the optical recording medium or magneto-optical recording medium. Furthermore, the program may be supplied to a computer via any transmission medium capable of transmitting data. [Explanation of symbols]

[0112] 100 television, 101 processing unit, 102 receiving unit, 103 memory unit, 104 connection unit, 105 speaker, 106 display unit, 107 network interface, 108 remote control signal receiving unit, 111 control unit, 112 genre detection unit, 113 image processing unit, 114 acquisition unit, 115 playback unit, 121 external recording device, 122 connection unit, 123A AV signal transmission path, 123B CEC signal transmission path, 131 external recording device

Claims

1. a receiving unit that receives at least video data and genre information; an acquisition unit that acquires image quality information corresponding to the genre information; a genre detection unit that detects that the genre information has been changed; a control unit that, when it is detected that the genre information has been changed, controls to set the image quality of the video data based on image quality information corresponding to the changed genre information after a predetermined time has elapsed since the genre information was changed; Equipped with The predetermined time is a transmission interval of the genre information defined in a broadcast wave.

2. The display device according to claim 1 , wherein the control unit changes the predetermined time period depending on the type of the broadcast wave.

3. The display device according to claim 1, wherein the control unit gradually changes the image quality information corresponding to the image feature of the scene of the video data at the time when the predetermined time has elapsed toward the image quality information corresponding to the changed genre information.

4. 2. The display device of claim 1, wherein if a new change in genre information is detected before the predetermined time has elapsed since the genre detection unit detected that the genre information had been changed, the control unit controls the image quality of the video data to be set based on image quality information corresponding to the changed genre information after the predetermined time has elapsed since the time when the new change in genre information was detected.

5. a playback unit that reads out and plays back recorded data of a program including the received video data and the genre information from a recording device that records the recorded data, The display device described in claim 1, wherein when the control unit detects that the genre information of the recorded data being played back has been changed, the control unit controls the image quality of the video data of the recorded data to be set based on the image quality information corresponding to the changed genre information after the predetermined time has elapsed from the time the genre information was changed.

6. The display device according to claim 1 , wherein the predetermined time is set based on a program guide acquired by the display device.

7. a playback unit that reads the video data from a recording device that records recording data of a program including the video data and the genre information via a first transmission path, reads the genre information from the recording data via a second transmission path different from the first transmission path, and plays back the recording data, The display device described in claim 1, wherein when the control unit detects that the genre information of the recorded data being played back has been changed, the control unit controls the image quality of the video data of the recorded data to be set based on the image quality information corresponding to the changed genre information after a predetermined time has elapsed from the time the genre information was changed.

8. receiving at least video data and genre information; acquiring image quality information corresponding to the genre information; Detecting that the genre information has been changed; When it is detected that the genre information has been changed, after a predetermined time has elapsed since the genre information was changed, control is performed so that the image quality of the video data is set based on the image quality information corresponding to the changed genre information. The computer executes the processing, A display control method, wherein the predetermined time is a transmission interval of the genre information defined in a broadcast wave.

9. receiving at least video data and genre information; acquiring image quality information corresponding to the genre information; Detecting that the genre information has been changed; When it is detected that the genre information has been changed, after a predetermined time has elapsed since the genre information was changed, control is performed so that the image quality of the video data is set based on the image quality information corresponding to the changed genre information. Have the computer execute the process, The predetermined time is a transmission interval of the genre information defined in a broadcast wave.

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