JP4561774B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly to a display device including a receiving unit that receives a broadcast signal supplied from a broadcasting station.

  2. Description of the Related Art Conventionally, a display device including a receiving unit that receives a broadcast signal supplied from a broadcasting station is known. These display devices are configured to display an image corresponding to the channel selected by the user on the display unit based on the received broadcast signal. Conventionally, there is known a broadcasting form in which a user is allowed to recognize a broadcasting station that supplies video by displaying a logo of a broadcasting station that supplies the video on a video of a channel selected by the user. Further, conventionally, a display device configured to recognize a video being displayed on the display unit and perform a predetermined process based on the recognized video (see, for example, Patent Documents 1 and 2), and A display device configured to display a logo mark corresponding to a broadcasting station on a display unit (for example, see Patent Documents 3 to 5) is known.

  In Patent Document 1, a logo mark (for example, a car logo mark) included in a video is recognized, and contents related to the logo mark (for example, a telephone number of a local car dealer of the car manufacturer) are displayed. Is displayed.

  Further, in Patent Document 2, when a pre-registered image or the like is included in the video, the image is recognized, and a pre-registered process (for example, output of a predetermined sound) is performed based on the image. Is called.

  In Patent Documents 3 and 4, the logo mark corresponding to the broadcast station is displayed on the electronic program guide to facilitate the recognition of the broadcast station.

  Moreover, in the said patent document 5, when the image | video is displayed on a display part, when a user performs predetermined | prescribed operation, the logo mark corresponding to the broadcasting station which supplies the image | video will be displayed on a display part.

Special table 2003-528498 gazette JP 2005-159910 A JP 2005-142760 A JP-A-11-55587 Japanese Patent Laid-Open No. 10-42214

  However, in the display device as described above, it takes a predetermined time (about 2 seconds to about 3 seconds for digital television) until a video is displayed after the user selects a channel. For this reason, after selecting a channel, if a predetermined time is not waited until the video is displayed, it is difficult for the user to recognize which broadcasting station supplies the video of the selected channel. is there. For this reason, there is a problem that the user needs to wait until the video is displayed when checking the broadcast station of the selected channel and switching to the channel of another broadcast station.

  Further, in Patent Documents 1 and 2, a certain image is recognized from a broadcast video and a predetermined process is performed based on the image. However, a broadcast station supplies the video of the selected channel. There is no disclosure of a configuration for allowing a user to recognize what is being. For this reason, similarly to the above, there is a problem that the user needs to wait until the video is displayed when checking the broadcasting station of the selected channel and switching to the channel of another broadcasting station.

  In Patent Documents 3 to 5, a logo mark corresponding to a broadcasting station is displayed on the electronic program guide or in accordance with the broadcast video. These processes are performed after the channel is selected and the video is displayed. Since the process is performed, it is difficult for the user to recognize which broadcasting station supplies the video of the selected channel unless a predetermined time is waited until the video is displayed after the channel is selected. There is an inconvenience. Therefore, as described above, there is a problem that the user needs to wait until the video is displayed when checking the broadcast station that supplies the video of the selected channel and switching to the channel of another broadcast station. .

  The present invention has been made to solve the above-described problems, and one object of the present invention is to recognize a broadcast station that supplies a selected channel without a user waiting for video display. Thus, a display device capable of switching to another channel is provided.

Means for Solving the Problems and Effects of the Invention

A display device according to a first aspect of the present invention includes: a display unit; a receiving unit that receives a broadcast signal supplied from a broadcasting station; a channel designation receiving unit that receives a channel designation from a user; and the receiving unit Based on the broadcast signal, the control unit that controls the display unit to display the video of the channel specified by the user on the display unit, and the logo mark regarding the broadcast station of the video of the channel displayed on the display unit are recognized. A recognizing unit and a storage unit for storing logo mark data recognized by the recognizing unit , and the control unit performs in advance recognition of the logo mark by the recognizing unit and storage by the storage unit of the recognized logo mark. in a state where we have, during the period from the reception of the specified channel before starting to display the channel of the video, controls to display on the display unit a logo stored in the storage unit So that is configured to, recognition means, in the video channel to be displayed on the display unit, extracts a portion that does not change the predetermined time as a candidate logo is displayed in the candidate display unit logo When the logo mark candidate and the channel image match a predetermined number of times or more, the logo mark candidate is recognized as a logo mark .

In the display device according to the first aspect, as described above, the logo mark stored in the storage unit is displayed on the display unit after the channel designation is received until the display of the channel video is started. The user can recognize the broadcasting station that supplies the video of the selected channel by the logo mark displayed before the video is displayed. Thus, the user can recognize the broadcasting station of the selected channel and switch to another channel without waiting for the display of the video. Further, in a broadcast form in which a logo mark corresponding to a broadcast station is displayed on the video of the channel displayed on the display unit, the logo mark corresponding to the broadcast station can be easily extracted automatically. That is, in the broadcasting form as described above, since the logo mark corresponding to the broadcasting station is fixedly arranged at a predetermined position in the video from the broadcasting station, by extracting a portion that does not change for a predetermined period, The extracted part can be used as a logo mark corresponding to the broadcasting station.

  In this case, preferably, the recognizing means extracts a portion of the channel image displayed on the display unit that does not change for a predetermined time as a logo mark candidate, and also extracts the logo mark candidate and the channel image for a certain period of time. By comparing each other, the logo mark candidate is recognized as a logo mark when the logo mark candidate and the channel image match at least a predetermined number of times. If comprised in this way, a logo mark can be extracted reliably, without misrecognizing the image | video of the program which changes with time among the videos displayed on a display part as a logo mark.

  In the configuration in which a portion of the program video that does not change for a predetermined time is extracted as a candidate for the logo mark, the recognition unit preferably searches for a video in a predetermined region from the video of the channel displayed on the display unit. By doing so, a logo mark candidate is extracted. If configured in this way, the area where the logo mark is placed is located at a fixed position in the video of the channel, so only the part (predetermined area) is searched to extract the logo mark candidates. can do. As a result, the logo mark can be easily extracted as compared with the case of searching the entire video of the channel.

  In the display device according to the first aspect, the control unit preferably displays the logo mark stored in the storage unit on the display unit until the display of the channel image is started, and the display of the channel image is started. After that, the display unit is controlled so as to erase the display of the logo mark stored in the storage unit. If constituted in this way, since the logo mark corresponding to the broadcast station is fixedly arranged at a predetermined position in the video from the broadcast station, even if the logo mark stored in the storage unit is erased, It is possible to recognize a broadcasting station that supplies video of the displayed channel.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a television according to an embodiment of the present invention. First, the configuration of the television 1 according to the present embodiment will be described with reference to FIG. In the present embodiment, an example in which the present invention is applied to a television 1 that is an example of a display device will be described.

  As shown in FIG. 1, a television 1 includes a tuner unit 2 including an antenna (not shown) that receives broadcast signals (digital signals and analog signals) supplied from a broadcast station, a personal computer 100, and a DVD player 101. And an external input board 3 including a plurality of external input terminals 3 a connected to an external device such as a cable TV tuner 102, a display unit 4 composed of an LCD (Liquid Crystal Display), an input from the tuner unit 2 and the external input board 3 An AV switch 5 that selects a specific video signal from a plurality of video signals to be output to the display unit 4 and a control unit (CPU) 6 that controls each unit of the television 1 are provided. The television 1 also includes an input unit 7 having a plurality of buttons 7a for changing the volume, channel, etc. of the television 1 and changing settings. Further, the input unit 7 includes a receiving unit 7 b that receives a signal from the remote controller 20. The remote controller 20 can also perform operations such as changing the volume. A signal from the input unit 7 or the remote controller 20 is input to the control unit 6. Based on the signal, the control unit 6 controls each unit of the television 1 to perform predetermined processing.

  The tuner unit 2 detects and demodulates the broadcast signal corresponding to the channel selected by the user from the broadcast signal received by the antenna (not shown), and outputs the data obtained as a result via the control unit 6 to the AV. It is configured to output to the switch 5.

  A video corresponding to the video signal input from the AV switch 5 is displayed on the display unit 4. A video signal input from the AV switch 5 can be selected by a user performing a predetermined operation on the input unit 7 or the remote controller 20.

  The control unit 6 is configured to control the television 1 in accordance with various setting information stored in the EEPROM 8 and a program stored in the ROM 9. The various setting information includes, for example, settings related to display on the display unit 4. Specifically, the setting related to viewing restrictions, the setting of captions (subtitles), the setting of languages, and the like. The SDRAM 10 is a memory in which data is temporarily stored when operations such as data processing by the control unit 6 are performed.

  Further, in the EEPROM 8, a logo mark corresponding to each broadcasting station that supplies a program of each channel is stored as data. The logo mark data is automatically extracted from the video of the program while viewing the program of the channel selected by the user, and is stored in the EEPROM 8. The control unit 6 is configured to display the logo mark stored in the EEPROM 8 on the display unit 4 until the program video is displayed after the user switches the channel.

  FIG. 2 is a diagram showing a state in which the video of the channel selected by the user is displayed on the display unit of the television shown in FIG. FIG. 3 is a diagram illustrating a standby state after a channel is selected by the user and before an image of the channel selected by the user is displayed on the display unit of the television. Next, with reference to FIG. 2 and FIG. 3, the display configuration of the display unit 4 when the user views a program of the television 1 according to the present embodiment will be described.

  As shown in FIG. 2, when a video of a program is displayed, in addition to the video of the program, a broadcast station display including the name of the broadcast station supplying the program being viewed and the name of the program 30, a channel number 40 of the currently selected channel, and a logo mark 50 unique to the broadcasting station supplying the program being viewed. The broadcast station display 30 is displayed based on an EPG (Electronic Program Guide) signal supplied by being superimposed on a signal corresponding to a channel program when a signal corresponding to the channel is transmitted from the broadcast station. . The channel number 40 is pre-set, so that the frequency of the broadcast signal of the channel and the channel of the television 1 are stored in the EEPROM 8 as a set. Therefore, when the user selects a channel, the EEPROM 8 Is displayed based on the data stored in. The logo mark 50 is displayed together with the program video because the logo mark 50 is incorporated in the program video as a part of the program video in order to suppress unauthorized copying. The logo mark 50 is usually displayed in the lower right area 60 or the lower left area 70 of the screen.

  The broadcast station display 30 and the channel number 40 can be prevented from being displayed by the user performing a predetermined operation. Further, since the logo mark 50 is incorporated in the video of the program, it cannot be prevented from being displayed.

  In the television 1 according to the present embodiment, the video of the program is displayed after a waiting time of about 2 seconds to about 3 seconds after the channel is selected. As shown in FIG. 3, during the waiting time from when a channel is selected until the program video is displayed, the broadcast signal corresponding to the selected channel is received, and the broadcast signal is analyzed and the video is analyzed. A display “Scanning ...” indicating that data is being converted is displayed.

  Further, during the standby time, the broadcast station display 30 (see FIG. 2) displayed based on the EPG signal transmitted superimposed on the signal corresponding to the video of the program is not displayed. Further, since the channel number 40 is stored in the EEPROM 8, it can be displayed immediately after the channel is selected by referring to the data in the EEPROM 8, regardless of the timing at which the program video is displayed. is there.

  In the present embodiment, as shown in FIG. 3, since the logo mark data corresponding to the broadcasting station is stored in the EEPROM 8, it is stored in the EEPROM 8 regardless of the timing of displaying the video of the program. The logo mark 51 can be displayed immediately after the channel is selected. The logo mark 51 has the same size as the logo mark 50 and is configured to be displayed at the same position.

  FIG. 4 is a flowchart for explaining the display operation of the television according to the present embodiment. Next, the display operation of the television 1 according to the present embodiment will be described with reference to FIGS.

  First, the control unit 6 determines whether or not there is an instruction to switch channels in step S1 of FIG. This determination is repeated when there is no instruction to switch channels. If the user gives an instruction to switch channels using the input unit 7 or the remote controller 20, the channel number 40 is displayed based on the data in the EEPROM 8 in step S2, as shown in FIG. In step S3, tuning is started. Specifically, the tuner unit 2 is controlled to receive a broadcast signal having a frequency corresponding to the selected channel, and the received broadcast signal is analyzed to convert the broadcast signal into video data and audio data. To do.

  Thereafter, in step S4, it is determined whether or not the logo mark of the broadcasting station that supplies the selected program is registered in the EEPROM 8. If no logo mark is registered, the process proceeds to step S6. If the logo mark is registered, the logo mark 51 is displayed in step S5 as shown in FIG. The display of the channel number 40 in step S2 and the display of the logo mark 51 in step S5 are performed substantially simultaneously and immediately after an instruction to switch channels is given.

  Thereafter, in step S6, it is determined whether video data and audio data have been acquired by the tuning in step S3. This determination is repeated when video data and audio data are not acquired. When the video data and the audio data are acquired, in step S7, as shown in FIG. 2, the video corresponding to the broadcast signal is displayed on the display unit 4 and the audio is output. The time from when the channel is switched until the video is displayed is about 2 seconds to about 3 seconds.

  Thereafter, the display of the logo mark 51 (see FIG. 3) based on the data read from the EEPROM 8 is erased. That is, since the logo mark 50 (see FIG. 2) is incorporated in the video from the broadcasting station, the logo mark 50 is not displayed even if the logo mark 51 is deleted from the data read from the EEPROM 8 after the video is displayed. The displayed state is maintained. In this way, the display operation of the television 1 according to the present embodiment is completed.

  FIG. 5 is a flowchart for explaining the television logo mark registration process according to the present embodiment. Next, the logo mark registration process of the television 1 according to the present embodiment will be described with reference to FIGS.

  The registration of the logo mark is performed when the video of the program is displayed on the display unit 4. Since the logo image 50 (see FIG. 2) is included in the video of this program, the data of the logo mark 50 is registered as the corresponding logo mark data of the broadcasting station that supplies the program. Specifically, a portion of the program video that does not change for a predetermined period is registered as a logo mark. This will be described in detail below.

  When registering a logo mark, it is first determined in step S11 whether or not there is a logo mark candidate (logo mark candidate data is stored in the EEPROM 8). If there is a logo mark candidate, the process proceeds to step S18. If there is no logo mark candidate, processing for extracting logo mark candidates from the video in steps S12 to S16 is performed.

  In the process of extracting logo mark candidates from the video, first, in step S12, it is determined whether or not the channel is in a normal tuning state. That is, in the preset processing, it is determined whether or not a preset channel registered by setting the channel number and the frequency of the broadcast signal is selected. If a channel that has not been preset is selected (not in the normal channel selection state), there is no program corresponding to that channel, and the logo mark registration process is terminated.

  In addition, when a preset channel is selected (in a normal channel selection state), the video of the selected program is displayed on the display unit 4. In this case, in step S13, as shown in FIG. 2, the search for the lower right region 60 of the video is performed. That is, since the logo mark 50 incorporated in the video of the program is displayed at the lower right or lower left of the normal video, first, the lower right area 60 is searched. In step S14, it is determined whether or not there is video data that does not change for a certain period (about 20 seconds in the present embodiment) in the searched video in the lower right region 60. If there is video data that does not change for a certain period in the lower right region 60, the process proceeds to step S17. If there is no video data that does not change for a certain period of time in the lower right area 60, the lower left area 70 is searched in the same manner as described above in step S15, and the searched lower left area 70 is searched in step S16. It is determined whether there is video data that does not change for a certain period in the video. If there is video data that does not change for a certain period in the lower left area 70, the process proceeds to step S17. If there is no video data that does not change for a certain period of time in the lower left area 70, the processes of steps S12 to S17 are repeated.

  If there is video data that does not change for a certain period in step S14 or step S16, the found image is stored in the EEPROM 8 as candidate logo mark data in step S17. The location of the found image (area 60 or area 70) is also stored in accordance with the EEPROM 8. In FIG. 2, the logo mark 50 is arranged in the region 70.

  Thereafter, in steps S18 to S23, determination processing is performed to determine whether or not the logo mark candidates found in steps S11 to S17 are registered as logo marks.

  As a determination process, first, in step S18, it is determined whether or not a predetermined time (about 1 minute in the present embodiment) has elapsed. If the predetermined time has not elapsed, this determination is repeated until the predetermined time has elapsed. If the predetermined time has elapsed, in step S19, the video data of the location (region 60 or region 70) where the logo mark candidate is extracted from the current video data, and the logo mark candidate data. In step S20, it is determined whether or not they match.

  In the current video data, if the video data of the location where the logo mark candidate is extracted does not match the logo mark candidate data, the video of the program where the stored logo mark candidate changes over time In step S21, the logo mark candidate data stored in the EEPROM 8 is erased. Thereafter, the logo mark registration process is started from the beginning.

  If the video data of the place where the logo mark candidate is extracted from the current video data and the logo mark candidate data match, the number of matches is incremented in step S22 and step S23. It is determined whether or not the number of matches is equal to or less than a predetermined threshold value (9 in this embodiment) set in advance. If the number of matches is less than or equal to the threshold value, the processes in steps S18 to S23 described above are repeated until the number of matches is greater than the threshold value. If the number of matches is larger than the threshold value, it is determined in step S24 that the logo mark candidate is a logo mark incorporated in the program video, and the logo mark candidate is registered as a logo mark. The

  In addition, if the channel is switched before the number of matches exceeds the threshold value, the logo mark candidate and the number of matches at that time are saved, and when the same channel is selected again, The logo mark registration process starts. In this case, since there is a logo mark candidate in the determination in step S11, the process proceeds to step S18. Further, in the determination processing in steps S18 to S24, the number of matches in step S22 is incremented by incrementing the stored number of matches.

  In this embodiment, the logo mark is registered in this way.

  In the present embodiment, as described above, the logo mark stored in the EEPROM 8 is displayed on the display unit 4 after the channel designation is received until the display of the video of the channel program is started. The broadcast station that supplies the video of the channel program can be recognized by the user by the logo mark displayed before the video is displayed. Thereby, the user can recognize the broadcasting station of the selected channel and switch to another channel without waiting for the display of the video of the program of the selected channel.

  Further, in the present embodiment, as described above, by recognizing a portion of the program video that does not change for a predetermined period as a logo mark, the logo corresponding to the broadcast station is added to the program video in order to suppress unauthorized copying. In the broadcast form in which the mark is displayed, the logo mark corresponding to the broadcast station can be easily extracted automatically. In other words, since the logo mark corresponding to the broadcast station is fixedly arranged in the lower left or lower right area, the program image from the broadcast station is extracted by extracting a portion that does not change for a predetermined period. The part can be a logo mark corresponding to the broadcasting station.

  In the present embodiment, as described above, a portion of the program video that does not change for about 20 seconds is extracted as a logo mark candidate, and the logo mark candidate and the program video are compared about every minute. By doing so, the logo mark candidate is recognized as a logo mark when the logo mark candidate and the video of the program match 10 times or more. If comprised in this way, a logo mark can be extracted reliably, without misrecognizing the part of the content of the program which changes with time among the images of the selected channel as a logo mark.

  In the present embodiment, as described above, the logo mark is arranged by extracting the logo mark candidates by searching the lower right area 60 or the lower left area 70 in the video of the program. Since the area is arranged at a fixed position in the video of the program, a logo mark candidate can be extracted by searching only that part (predetermined area). Thereby, compared with the case where the whole video of a program is searched, a logo mark can be extracted easily.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, the logo mark candidate and the current video are compared every predetermined time (1 minute) and the number of matches is greater than the threshold value (9 times) (the number of matches is 10). In this example, the logo mark candidate is registered as a logo mark in the case of the first time. However, the present invention is not limited to this, and the predetermined time and threshold value may be set to other values.

  In the above embodiment, the logo mark 51 has the same size as the logo mark 50 and is displayed at the same position. However, the present invention is not limited to this, and the size and position are changed. May be.

  In the above embodiment, an example in which the logo mark is extracted and stored from the video of the program is shown. However, the present invention is not limited to this, and the logo mark corresponding to each broadcasting station is stored in advance in a ROM or the like. May be.

  In the above-described embodiment, the logo mark candidate data is erased when the logo mark candidate and the program video do not match, but the present invention is not limited to this. The number of mismatches between the logo mark candidate and the program video may be counted, and the logo mark candidate data may be deleted when the number of mismatches exceeds a predetermined threshold. For example, when a CM is inserted in a program, it is considered that a logo mark is not displayed on the CM. Therefore, when a logo mark candidate is compared with a video of a program in the CM, they must be matched. Conceivable. In this case, even if the logo mark candidates are correctly extracted, the logo mark candidates are deleted. By configuring as described above, even when a CM is inserted into a program, if the number of mismatches is smaller than a predetermined threshold, the logo mark candidate is not erased, so the logo mark can be extracted. it can.

  In the above embodiment, an example in which the display unit 4 is an LCD has been described. However, the present invention is not limited to this, and the display unit 4 may be configured by a plasma display panel (PDP) or a cathode ray tube (CRT).

It is a block diagram which shows the structure of the television by one Embodiment of this invention. It is a figure which shows the state in which the image | video of the channel which the user selected is displayed on the display part of the television shown in FIG. It is a figure which shows the standby state before the video of the channel which the user selected is displayed on the display part of a television after a channel is selected by the user. 3 is a flowchart for explaining a display operation of the television shown in FIG. 1. 3 is a flowchart for explaining registration processing of a logo mark of the television shown in FIG. 1.

Explanation of symbols

1 Television (display device)
2 Tuner unit (receiver)
4 Display unit 6 Control unit 8 EEPROM (storage unit)
50 Logo mark 51 Logo mark 60, 70 Predetermined area

Claims (4)

A display unit;
A receiving unit for receiving a broadcast signal supplied from a broadcasting station;
A channel designation receiving means for receiving a channel designation from the user;
Based on the broadcast signal received by the receiving unit, a control unit that controls the display unit to display the video of the channel designated by the user on the display unit;
Recognizing means for recognizing a logo mark relating to a broadcast station of a channel image displayed on the display unit;
A storage unit for storing logo mark data recognized by the recognition means,
The control unit receives the designation of the channel and displays the image of the channel in a state where the recognition of the logo mark by the recognition unit and the storage of the recognized logo mark by the storage unit are performed in advance. Until it starts , it is configured to control to display the logo mark stored in the storage unit on the display unit ,
The recognizing unit extracts a portion of the video of the channel displayed on the display unit that does not change for a predetermined time as the logo mark candidate, and the logo mark candidate and the channel displayed on the display unit. A display device configured to recognize the logo mark candidate as the logo mark when the logo mark candidate and the video of the channel match a predetermined number of times or more by comparing with a video . The recognizing unit extracts a portion of the video of the channel displayed on the display unit that does not change for a predetermined time as the logo mark candidate, and the logo mark candidate and the channel displayed on the display unit. By comparing the image with a video every predetermined time, the logo mark candidate is recognized as the logo mark when the logo mark candidate and the video of the channel match a predetermined number of times or more. The display device according to claim 1 . It said recognition means, in the video channel to be displayed on the display unit, by searching an image of a predetermined region, the being configured to extract a candidate logo, according to claim 2 Display device. The control unit displays the logo mark stored in the storage unit on the display unit until the display of the video of the channel is started, and stores the logo mark in the storage unit after the display of the video of the channel is started. logo mark display is configured to control the display unit to erase the display device according to any one of claims 1-3.

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