WO2011004804A1 - Video display device and video display method - Google Patents

Video display device and video display method Download PDF

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Publication number
WO2011004804A1
WO2011004804A1 PCT/JP2010/061440 JP2010061440W WO2011004804A1 WO 2011004804 A1 WO2011004804 A1 WO 2011004804A1 JP 2010061440 W JP2010061440 W JP 2010061440W WO 2011004804 A1 WO2011004804 A1 WO 2011004804A1
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WO
WIPO (PCT)
Prior art keywords
image quality
video
image
parameter value
quality parameter
Prior art date
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PCT/JP2010/061440
Other languages
French (fr)
Japanese (ja)
Inventor
哲夫 池山
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シャープ株式会社
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Publication of WO2011004804A1 publication Critical patent/WO2011004804A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H04N5/58—Control of contrast or brightness in dependence upon ambient light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42202—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS] environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light

Definitions

  • the present invention relates to an image display apparatus and an image display method for changing the image quality of an input image and displaying the image with the image quality changed.
  • a video display device capable of changing the image quality setting according to the type of video or the viewing environment has been put into practical use.
  • the video display device displays a video adjustment menu, accepts settings of image quality parameter values such as brightness, black level, contrast, color density, hue, and image quality, and uses the received image quality parameter values to The image quality is adjusted and displayed.
  • video display devices having an image quality mode suitable for the type of video, such as a movie mode, have been put into practical use.
  • the user does not need to adjust complicated image quality parameter values, and can obtain a good image quality simply by selecting an image quality mode according to the type of video.
  • an image quality mode suitable for the viewing environment such as an image quality mode suitable for watching movies while keeping the surroundings bright, and an image quality mode suitable for watching movies with dark surroundings to create a cinema atmosphere.
  • the television that has it is also put into practical use.
  • the user himself / herself has to adjust the image quality parameter or judge the video type and viewing environment and manually set the image quality mode.
  • the image quality setting is performed, there is a problem that the video cannot be viewed with the optimum image quality, and the image quality setting can be automatically and integratedly performed.
  • a video display device has been desired.
  • Patent Document 1 discloses a video display device that automatically determines the type of video and adjusts the image quality, but comprehensively determines the video type and viewing environment to determine the image quality setting or image quality. Mode setting is not possible.
  • the present invention has been made in view of such circumstances, and provides a video display device and a video display method capable of determining the type and surrounding environment of a video and automatically setting an image quality parameter value or an image quality mode. With the goal.
  • the video display device receives any one of a plurality of types of video having different image quality characteristics, changes the quality of the input video using the image quality parameter value for changing the video quality, and changes the image quality
  • the brightness detection means for detecting the brightness of the surrounding environment
  • the determination means for determining the type of the video
  • determining means for determining an image quality parameter value based on the type of video discriminated by the means.
  • the determining unit determines another image quality parameter value
  • the image quality of the input image is changed using the other image quality parameter value.
  • the image quality parameter value between the one image quality parameter value and the other image quality parameter value is used to change the image quality of the input video.
  • the video display device is characterized in that the determining means determines an image quality parameter value based on information on a plurality of brightnesses or types detected at different times.
  • the video display device stores a plurality of image quality changing methods associated with image quality parameter values for changing the image quality of the video, and any one of a plurality of types of videos having different image quality characteristics is input.
  • Brightness detection means for detecting the brightness of the surrounding environment in a video display device that changes the quality of the input video using the image quality parameter value related to the selected image quality change method and displays the video with the changed image quality;
  • Discriminating means for discriminating the type of video, and selection means for selecting one image quality changing method based on the brightness detected by the brightness detecting means and the type of video discriminated by the discriminating means. It is characterized by providing.
  • the image quality of the input video is determined using the image quality parameter value related to the other image quality changing method.
  • means for changing the image quality of the input video using an image quality parameter value between the image quality parameter value related to one image quality change method and the image quality parameter value related to another image quality change method is provided. It is characterized by that.
  • the video display device is characterized in that the selection means selects one image quality change method based on information on a plurality of brightnesses or types detected at different times. .
  • the video display device includes a means for comparing the brightness detected by the brightness detection means and the first threshold value, the brightness detected by the brightness detection means, and the first threshold value.
  • the video display device is characterized in that the image quality parameter value is a value related to video contrast, brightness, color density, hue, color temperature, contour enhancement, or gamma correction.
  • the video display apparatus includes means for acquiring a frame frequency of the video, and the determination means includes means for comparing the acquired frame frequency with a predetermined frequency.
  • the video display device includes means for detecting substantially the same frame picture or field picture from a plurality of time-sequential frame pictures or field pictures constituting the video, and the discriminating means detects the substantially It is characterized by comprising means for determining whether or not frame images or field images of the same video are arranged in chronological order according to a predetermined rule.
  • any one of a plurality of types of video having different image quality characteristics is input, and the quality of the input video is changed using the image quality parameter value for changing the video quality of the video.
  • the video display method for displaying the recorded video the brightness of the surrounding environment is detected, the type of the video is determined, and the image quality parameter value is determined based on the detected brightness and the video type. To do.
  • the image display method stores a plurality of image quality change methods associated with image quality parameter values for changing the image quality of an image, and any one of a plurality of types of images having different image quality characteristics is input.
  • the video display method that changes the image quality of the input video using the image quality parameter value related to the selected image quality change method and displays the video with the changed image quality
  • the brightness of the surrounding environment is detected and the type of the video is determined
  • one image quality changing method is selected based on the detected brightness and the type of video.
  • the detection means detects the brightness of the surrounding environment.
  • the detection means is, for example, an illuminance sensor or an RGB sensor. Needless to say, the detection means is not particularly limited to an illuminance sensor or the like as long as detection corresponding to the brightness of the surrounding environment can be performed.
  • the discrimination means discriminates the type of video.
  • the type of video is determined based on the characteristics of the video itself, for example, the characteristics such as the frame frequency of the video, the arrangement pattern of the frame images constituting the video, the luminance of the video, and the hue.
  • the type of video may be determined based on meta information accompanying the video, electronic program guide information related to the video, and the like.
  • the determining means determines the image quality parameter according to the surrounding environment and the type of video. Note that the image quality parameter may be changed without changing the image quality mode.
  • the image quality parameter value even when one image quality parameter value is determined, the brightness of the surrounding environment or the image type changes, and another image quality parameter value should be selected. A value between the image quality parameter value and the other image quality parameter value is determined as the image quality parameter value. Therefore, the image quality parameter does not change abruptly even if the surrounding environment or the type of video changes.
  • the value of the image quality parameter is determined based on a plurality of brightnesses or video types detected at different times. Therefore, even if the brightness of the surrounding environment or the type of video changes temporarily, the image quality parameter does not change abruptly.
  • the detection means detects the brightness of the surrounding environment.
  • the discrimination means discriminates the type of video.
  • the determining means determines the image quality changing method according to the surrounding environment and the video type.
  • the image quality parameter does not change abruptly even if the surrounding environment or the type of video changes.
  • the image quality changing method is determined based on a plurality of brightnesses or video types detected at different times. Therefore, even if the brightness of the surrounding environment or the type of video changes temporarily, the image quality changing method does not change abruptly.
  • the image quality of the input video when the brightness is less than the first threshold, the image quality of the input video is changed using the image quality parameter according to the first image quality change method, and when the brightness is equal to or greater than the second threshold, The image quality of the input video is changed using the image quality parameter relating to the 2 image quality change method.
  • the brightness is equal to or higher than the first threshold value and lower than the second threshold value, an image quality parameter value between the image quality parameter value related to the first image quality change method and the image quality parameter value related to the second image quality change method is used.
  • the image quality of the input video is changed. Accordingly, it is possible to change the image quality appropriately according to the brightness of the surrounding environment.
  • values relating to image contrast, brightness, color density, hue, color temperature, edge enhancement, or gamma correction are automatically set. Is done.
  • the type of video is determined by comparing the frame frequency of the video with a predetermined frequency. For example, by comparing the frame frequency with 24 Hz, it can be determined whether or not the video is a movie. Note that the type of video can be determined in the same manner as long as the frame frequency and the type of video are related, not limited to movies.
  • substantially the same frame image or field image is detected from a plurality of time-sequential frame images or field images constituting the video, and the discriminating means detects the frame image or the frame image of the detected substantially identical video.
  • the type of video is determined by determining whether the field images are arranged in chronological order according to a predetermined rule. For example, when the frame frequency of a movie image is converted from 24 Hz to 60 Hz or 50 Hz, it is not possible to determine the type of image, particularly whether it is a movie, based on the frame frequency. However, when the frame frequency is converted as described above, frame images or field images of substantially the same video appear according to a predetermined rule. Therefore, even when the type of video cannot be determined by the frame frequency, it is possible to determine the type of video by the arrangement of frame images or field images.
  • the type of image and the surrounding environment can be determined, and the image quality parameter value or the image quality mode can be automatically set.
  • FIG. It is the block diagram which showed the example of 1 structure of the video display apparatus concerning this Embodiment 1.
  • FIG. It is a flowchart which shows the process sequence of the control part which concerns on image quality mode change.
  • 11 is a flowchart illustrating a processing procedure of a control unit according to an image quality mode change in the second embodiment.
  • 11 is a flowchart illustrating a processing procedure of a control unit according to an image quality mode change in the second embodiment.
  • 11 is a flowchart illustrating a processing procedure of a control unit according to an image quality mode change in the second embodiment. It is explanatory drawing which shows the smoothing process of illumination intensity notionally. It is explanatory drawing which shows notionally the method of providing a delay time and determining an image quality parameter. It is explanatory drawing which showed notionally the relationship between illumination intensity and an image quality parameter.
  • FIG. 1 is a block diagram showing a configuration example of a video display apparatus according to the first embodiment.
  • the video display apparatus according to the first embodiment is capable of discriminating the surrounding environment and the type of input video, and automatically setting the image quality mode (image quality changing method) and the image quality parameter value.
  • the video display apparatus includes an analog tuner unit 1, a video / audio extraction unit 2, a digital tuner unit 3, a digital demodulation unit 4, a separation unit 5, a video decoding unit 6, a video selection unit 7, and a video processing unit.
  • synthesis unit 9 video output conversion unit 10, video display unit 11, communication unit 12, IP broadcast tuner unit 13, EPG / OSD / reservation processing unit 14, audio decoding unit 15, audio selection unit 16, audio output conversion unit 17 and a speaker 18 are provided.
  • the video display device includes a control device unit 29 that controls the operation of each component unit 28 related to video display.
  • the control device unit 29 includes a channel selection unit 19, a RAM 20, a ROM 21, a communication control unit 23, a remote operation signal light receiving unit 24, a control unit 25, and an illuminance detection unit 26 connected via a bus 22.
  • the video display device further includes a video input unit (not shown) to which the external video output device C is connected, for example, an HDMI terminal conforming to the HDMI (High-Definition Multimedia Interface) standard, and is output from the external video output device C.
  • Video information such as video data, audio data, frame frequency, and meta information indicating video content is input via an HDMI cable and a video input unit.
  • Video data and audio data are input to the video selection unit 7 and the audio selection unit 16 through the TMDS channel, respectively, and frame information, meta information indicating the video content, and the like are input to the control unit 25 through the CEC channel.
  • the HDMI cable is an example of a communication line, and video data and audio data may be transmitted and received by wireless communication using a millimeter wave in the 60 GHz band in addition to a cable based on another standard.
  • the analog tuner unit 1 is a tuner that amplifies an RF signal related to analog broadcasting received by the analog broadcasting antenna A, and selects a broadcast signal of a specific channel in accordance with a channel selection instruction from the channel selection unit 19, and the analog tuner unit 1 is The selected broadcast signal is supplied to the video / audio extraction unit 2.
  • the video / audio extraction unit 2 extracts video data and audio data from the broadcast signal selected by the analog tuner unit 1.
  • the video / audio extraction unit 2 provides the extracted video data to the video selection unit 7 and the audio data to the audio selection unit 16.
  • the digital tuner unit 3 amplifies an RF signal related to digital satellite broadcast or an RF signal related to terrestrial digital broadcast received by the digital broadcast antenna B, and selects a signal of a specific channel according to a channel selection instruction from the channel selection unit 19.
  • the digital tuner unit 3 is a tuner and supplies the selected signal to the digital demodulation unit 4.
  • the broadcast signal given from the digital tuner unit 3 to the digital demodulation unit 4 is modulated by, for example, an OFDM (Orthogonal Frequency Division Multiplexing) system.
  • the digital demodulation unit 4 demodulates the broadcast signal given from the digital tuner unit 3 into MPEG2TS (Transport Stream) format data, and gives the demodulated data to the separation unit 5.
  • Data in the TS format is composed of a plurality of packets.
  • a packet is a packet of time-series video data and audio data, program sequence information, and the like that constitute video and audio of a program, and from a plurality of packets, video data and audio data in time-series order, and Program arrangement information is restored.
  • the program arrangement information includes broadcast time of the program, meta information related to the video type, and the like.
  • the communication unit 12 receives a signal distributed from an external server computer via an IP (Internet Protocol) network such as a LAN or the Internet under the control of the communication control unit 23, and sends the received signal to the IP broadcast tuner unit 13. give.
  • IP Internet Protocol
  • the communication unit 12 may be configured to receive video and audio signals via a telephone line or other communication network.
  • the IP broadcast tuner unit 13 selects a broadcast signal of a specific channel from the signal given from the communication unit 12 in accordance with a channel selection instruction from the channel selection unit 19, demodulates or decodes the selected broadcast signal, and decodes the decoded data.
  • the separation unit 5 is provided.
  • the data is the same as the data decoded by the digital demodulator 4.
  • the separation unit 5 selects a packet related to video data and audio data of one program from the data given from the digital demodulation unit 4 or the IP broadcast tuner unit 13, and the video data and audio data including the selected packet are respectively selected. This is applied to a video buffer and an audio buffer (not shown).
  • the video buffer and the audio buffer supply the video data and audio data supplied from the separation unit 5 to the video decoding unit 6 and the audio decoding unit 15 at predetermined timings, respectively.
  • the separation unit 5 selects a packet related to the program arrangement information from the data, and gives the program arrangement information including the selected packet to the EPG / OSD / reservation processing unit 14. Further, the separation unit 5 selects a packet related to the meta information about the video from the data, gives the meta information including the selected packet to the control unit 29, and the RAM 20 stores the meta information.
  • the video decoding unit 6 decodes the video data separated by the separation unit 5 in accordance with the MPEG2 compression / decompression method, and provides the decoded video data to the video selection unit 7 via a buffer memory (not shown). Further, the video decoding unit 6 gives video data to the control device unit 29, and the RAM 20 stores the video data.
  • the video selection unit 7 selects one video data from the video data supplied from the video / audio extraction unit 2, the video decoding unit 6 or the external video output device C in accordance with an instruction from the control unit 25, and selects the selected video. Data is given to the video processing unit 8. Note that two pieces of video data may be given to the video processing unit 8 as necessary, such as a two-screen display.
  • the video processing unit 8 changes the image quality of the video related to the video data given from the video selection unit 7 according to the image quality parameter value given from the control unit 25, that is, performs image quality correction, and synthesizes the video data whose image quality has been changed. Part 9 is given.
  • the image quality of the video is changed based on the contrast, brightness, color density, black level, hue, color temperature, or gamma correction value given from the control unit 25.
  • the EPG / OSD / reservation processing unit 14 decodes the program arrangement information given from the separation unit 5 and creates an electronic program guide (EPG: Electronic Program Guide) based on the decoded program arrangement information.
  • the video data of the program guide is given to the synthesizing unit 9 in accordance with instructions from the control unit 25. Further, the EPG / OSD / reservation processing unit 14 gives video data for drawing various information such as a setting menu screen, volume cage, current time, and channel selection prepared in advance to the synthesizing unit 9. Further, the EPG / OSD / reservation processing unit 14 performs program reservation processing using the created electronic program guide.
  • the synthesizing unit 9 synthesizes the video data given from the video processing unit 8 and the EPG / OSD / reservation processing unit 14, and gives the synthesized video data to the video output conversion unit 10.
  • the synthesis unit 9 outputs the video data provided from the video processing unit 8 to the video output conversion unit as it is.
  • the video output conversion unit 10 converts the video data given from the synthesizing unit 9 into a video signal in a format that can be displayed on the video display unit 11, and gives the converted video signal to the video display unit 11.
  • the video display unit 11 is, for example, a liquid crystal display device, and includes a liquid crystal panel that displays video, a panel drive unit, and a backlight that illuminates the liquid crystal panel from the back side. An image is displayed based on the signal.
  • the video display unit 11 is not limited to a liquid crystal display device, and includes a plasma display, an organic EL display, and the like.
  • the audio decoding unit 15 decodes the audio data given from the separation unit 5 according to a predetermined compression / decompression method, for example, AAC (Advanced Audio Coding) compression / decompression method, and selects the decoded audio data at a predetermined timing. Part 16 is given.
  • a predetermined compression / decompression method for example, AAC (Advanced Audio Coding) compression / decompression method
  • the audio selection unit 16 selects one audio data from the audio data supplied from the video / audio extraction unit 2, the audio decoding unit 15, or the external video output device C according to an instruction from the control unit 25, and selects the selected audio data.
  • the data is given to the audio output conversion unit 17.
  • the audio output conversion unit 17 converts the audio data into an audio signal in a format in which audio can be output from the speaker 18, and gives the converted audio signal to the speaker 18.
  • the speaker 18 outputs sound based on the sound signal given from the sound output conversion unit 17.
  • the RAM 20 is a volatile memory such as a DRAM or SRAM that temporarily stores various data generated when the arithmetic processing of the control unit 25 is executed.
  • the ROM 21 is a non-volatile memory such as a mask ROM or EEPROM that stores a computer program necessary for controlling the operation of the video display device. Further, the ROM 21 stores the first to fourth image quality modes in association with image quality parameter values for changing the image quality of the video.
  • the first image quality mode is a so-called movie mode, and is an image quality mode suitable for a case where the video to be viewed is a movie and the viewing environment is a dark room.
  • the first image quality mode is associated with image quality parameter values that emphasize image gradation, dark area reproducibility, and film texture.
  • the second image quality mode is a so-called movie / living mode, and is an image quality mode suitable for a room in which the video to be viewed is a movie and the viewing environment is bright.
  • the second image quality mode is associated with an image quality parameter value that enhances contrast more than in the first image quality mode.
  • the third image quality mode is a so-called standard mode, and is an image quality mode suitable for a case where the viewing target is an image other than a movie and the viewing environment is a dark room.
  • Image quality parameter values are associated with the third image quality mode so that the image quality is balanced between contrast and gradation that achieves a sharp image with brightness of a general household.
  • the fourth image quality mode is a so-called dynamic mode, and is an image quality mode suitable when the object to be viewed is a video other than a movie and the viewing environment is a bright room.
  • the fourth image quality mode is associated with an image quality parameter value so that the image quality emphasizes a contrast feeling that realizes a sharp image even in a bright environment.
  • the control unit 25 is a CPU that controls the operation of each component unit by reading the computer program stored in the ROM 21 into the RAM 20 and executing it, thereby realizing image quality change processing described later.
  • the channel selection unit 19 is a circuit that gives a channel selection instruction to the analog tuner unit 1, the digital tuner unit 3, and the IP broadcast tuner unit 13 under the control of the control unit.
  • the communication control unit 23 is a circuit that controls reception of the IP broadcast by the communication unit in accordance with the control of the control unit.
  • the remote operation signal light receiving unit 24 is a light receiving element that receives a remote operation signal transmitted from the remote operation device 27, and provides the control unit 25 with a remote operation signal obtained by receiving the light.
  • the illuminance detection unit 26 is a CDS sensor including a CdS cell formed by sintering cadmium sulfide on a substrate, for example, and is disposed near the periphery of the video display unit 11.
  • the illuminance detection unit 26 detects the brightness of the surrounding environment, for example, illuminance, and gives a signal indicating the detected illuminance (hereinafter referred to as illuminance) to the control unit 25.
  • an RGB detection unit may be used.
  • the installation position of the illuminance detection unit 26 is not limited to the vicinity of the periphery of the video display unit 11, and may be provided in the remote operation device 27, for example.
  • FIG. 2 is a flowchart showing a processing procedure of the control unit 25 according to the image quality mode change.
  • the control unit 25 acquires a frame frequency (step S11). Specifically, the control unit 25 can acquire the frame frequency from the external video output device C via, for example, the CEC channel of the HDMI cable. In addition, the control unit 25 acquires the frame frequency from the information regarding the video separated by the separation unit 5.
  • the control part 25 determines whether the frame frequency of an input image
  • step S12 When it is determined that the frame frequency is not 24 Hz (step S12: NO), the control unit 25 detects a frame image or field image still image or moving image arrangement pattern constituting the input image (step S13). Next, the control unit 25 determines whether or not the still image and the moving image detected in step S13 are arranged in a predetermined pattern (step S14).
  • FIG. 3A is an explanatory diagram conceptually showing a method for discriminating a movie, and conceptually shows frame images constituting a movie image having a frame frequency of 24 Hz.
  • FIG. 3B is an explanatory diagram conceptually showing a movie discrimination method, conceptually showing frame images constituting a movie image converted (pulled down) from 24 Hz to 60 Hz.
  • the input video is converted from 24 Hz to 60 Hz, for example, as shown in FIG. 3B, there are two still image frame images and moving image frame images (frame images 1, 1).
  • the still image refers to an image in which one frame image of interest is substantially the same as the previous frame image in chronological order from the one frame image.
  • a moving image refers to an image in which one frame image of interest is different from the previous frame image in chronological order from the one frame image.
  • step S12 If it is determined in step S12 that the frame frequency is 24 Hz (step S12: YES), or if it is determined in step S14 that still images and moving images are arranged in a predetermined pattern (step S14: YES), the control unit 25 Detects the illuminance using the illuminance detection unit 26 (step S15). And the control part 25 determines whether the detected illumination intensity is less than a predetermined threshold value (step S16). Note that the threshold value is stored in the ROM 21.
  • step S17 When it is determined that the illuminance is less than the threshold (step S16: YES), the control unit 25 selects the first image quality mode (step S17). Note that, when the first image quality mode is selected, the control unit 25 executes a process of reading image quality parameters related to the first image quality mode from the ROM 21 to the RAM 20. As will be described below, when the second to fourth image quality modes are selected, the image quality parameters related to each image quality mode are similarly read. When it determines with illumination intensity being more than a threshold value (step S16: NO), the control part 25 selects 2nd image quality mode (step S18).
  • step S14 If it is determined in step S14 that still images and moving images are not arranged in a predetermined pattern (step S14: NO), the control unit 25 detects illuminance using the illuminance detection unit 26 (step S19). And the control part 25 determines whether the detected illumination intensity is less than a predetermined threshold value (step S20).
  • step S20: YES When it is determined that the illuminance is less than the threshold (step S20: YES), the control unit 25 selects the third image quality mode (step S21). When it determines with illumination intensity being more than a threshold value (step S20: NO), the control part 25 selects 4th image quality mode (step S22).
  • control unit 25 gives an instruction to the video processing unit 8 using the image quality parameter value related to the selected image quality mode, and changes the image quality of the input video. (Step S23), the process ends.
  • the video type and illuminance can be detected, and the image quality mode suitable for the video type and illuminance can be automatically set. Therefore, the user does not need to select and set the optimum image quality mode based on the image type and illuminance, and can view the image in the optimum image quality mode in consideration of the image type and illuminance.
  • control unit 25 acquires a frame frequency (step S31), and determines whether or not the frame frequency of the input video is 24 Hz (step S32).
  • the control unit 25 detects a still image and a moving image from the input video (step S33). Specifically, one frame image constituting the input video is set as a detection target, one frame image that is the detection target is compared with a frame image that is one time earlier than the one frame image in time series order, If they are substantially the same, the one frame image is detected as a still image. On the contrary, when each frame image is different, the one frame image is detected as a moving image. Note that the still image and the moving image may be determined based on the magnitude of the motion vector.
  • step S34 stores the detection result of step S34 in RAM20 (step S34).
  • the control unit 25 stores the ratio of the still image and the moving image, that is, the number of frame images detected as the still image and the moving image as the moving image, based on the plurality of detection results stored in the RAM 20 in step S34.
  • a parameter value Frt indicating a ratio with the number of frame images is calculated (step S35).
  • the parameter value Frt is not a determination result at the present time of the arrangement pattern of still images and moving images, that is, a determination result obtained from five frame images, but a value that also considers an arrangement pattern at a past time point. By considering the past arrangement pattern, it is possible to prevent the image quality from frequently changing due to the temporary change of the arrangement pattern.
  • Frt (Frt ⁇ 1 ⁇ Fnt ⁇ 1 + Fr) / Fnt (1)
  • Fr is the determination result of the current frame image.
  • Fr takes a value of 1 if the current frame image is a movie, and takes a value of 0 if it is not a movie.
  • Frt ⁇ 1 is a ratio of the movie determination result in a predetermined number of frame images before the current frame image
  • Fnt ⁇ 1 is the number of frame images before the current frame image
  • Fnt is The number of frames up to the current frame image.
  • the ratio of movie determination results calculated at a plurality of different times may be smoothed by a low-pass filter. That is, the ratio value may be adjusted so that the ratio of the movie determination result does not change rapidly in a short time. Further, the ratios of the movie determination results calculated at a plurality of different time points may be simply averaged. Further, in a movie content, a scene close to a still image may not be determined as a movie because still image determination is continued. Further, when movie content is viewed on the video display device, the video may be temporarily stopped. Also at this time, still image determination continues, and movie determination stops. Therefore, when still images continue continuously during movie determination, it is possible to continue to determine a movie until there is a next frame determined to be a moving image.
  • control unit 25 determines whether or not the parameter value Frt is within a predetermined range (step S36). By determining whether or not the parameter value Frt is within a predetermined range, it is possible to determine whether the input video is a movie or a non-movie.
  • step S32 When it is determined in step S32 that the frame frequency is 24 Hz (step S32: YES), or when it is determined in step S36 that the parameter value Frt is within the predetermined range (step S36: YES), the control unit 25 determines the illuminance. Is detected (step S37). The illuminance detected in step S37 is the illuminance at the moment of detection. And the control part 25 memorize
  • control unit 25 smoothes the detection result of the illuminance using the plurality of illuminances stored in the RAM 20 in the process of step S38, that is, the plurality of illuminances detected at different time points (step S39).
  • FIG. 7 is an explanatory diagram conceptually showing the illuminance smoothing process.
  • the horizontal axis represents time, and the vertical axis represents illuminance.
  • the thin line indicates the illuminance at that moment when detected by the illuminance detection unit 26, and the thick line indicates the illuminance obtained by smoothing the instantaneous illuminance with a low-pass filter. More specifically, the smoothed illuminance is obtained by adjusting the value so that the change in instantaneous illuminance per unit time is within a certain value. Moreover, you may simply calculate the average value of the illuminance of the moment detected at several different time points.
  • the smoothing method is not particularly limited as long as the illuminance value can be changed so that the instantaneous illuminance does not change abruptly.
  • the illuminance smoothed by the process of step S39 is simply referred to as illuminance.
  • illuminance the illuminance smoothed by the process of step S39.
  • control unit 25 determines whether or not the illuminance is less than the first threshold value (step S40). When it determines with it being less than a 1st threshold value (step S40: YES), the control part 25 selects 1st image quality mode (step S41). Then, the control unit 25 determines the image quality parameter value related to the first image quality mode by providing a delay time (step S42). That is, the control unit 25 determines the image quality parameter value so that the image quality parameter value does not change rapidly in a short time.
  • control unit 25 has a difference between the image quality parameter value determined in the previous process and the image quality parameter value to be determined in step S42 within a certain value, and the image quality parameter related to the first image quality mode, What is necessary is just to determine an image quality parameter so that the difference with the image quality parameter value which should be determined by step S42 becomes the minimum.
  • FIG. 8 is an explanatory diagram conceptually showing a method for determining an image quality parameter by providing a delay time.
  • the horizontal axis represents time
  • the vertical axis represents image quality parameters.
  • step S40 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold (step S40). S43). If it is determined as NO in step S43 (step S43: NO), the control unit 25 selects the second image quality mode (step S44). Then, the control unit 25 determines the image quality parameter value related to the second image quality mode by providing a delay time (step S45). The processing content related to the delay time is the same as in step S42.
  • step S43 If it is determined in step S43 that the illuminance is greater than or equal to the first threshold value and less than the second threshold value (step S43: YES), the control unit 25 sets the image quality parameter value related to the first image quality mode and the second image quality mode. A parameter value between the image quality parameter values is determined (step S46).
  • FIG. 9 is an explanatory diagram conceptually showing the relationship between illuminance and image quality parameters.
  • the horizontal axis indicates the illuminance
  • the vertical axis indicates the image quality parameter.
  • the image quality parameter value related to the first image quality mode is set.
  • the image quality parameter value related to the second image quality mode is set.
  • the image quality parameter value is set by linear approximation using the image quality parameter value of each image quality mode.
  • the first threshold value is c1
  • the second threshold value is c2
  • the image quality parameter value related to the first image quality mode is p1
  • the image quality parameter value related to the second image quality mode is p2
  • the illuminance is a
  • step S36 When it is determined in step S36 that the parameter value Frt is outside the predetermined range (step S36: NO), the control unit 25 detects the illuminance (step S47), and stores the detected illuminance in the RAM 20 (step S48). The detection result of illuminance is smoothed (step S49).
  • control unit 25 determines whether or not the illuminance is less than the first threshold (step S50). When it determines with it being less than a 1st threshold value (step S50: YES), the control part 25 selects 3rd image quality mode (step S51). Then, the control unit 25 provides a delay time and determines an image quality parameter value related to the third image quality mode (step S52). The processing content related to the delay time is the same as in step S42.
  • step S50 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold (step S50). S53).
  • step S53 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold (step S50).
  • step S53 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold (step S50).
  • step S53 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold.
  • step S53 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold.
  • step S53 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold.
  • step S53 selects the fourth image quality mode (step S54).
  • step S55 determines the image quality parameter value related to the fourth image quality mode by providing a delay time (step S55).
  • the processing content related to the delay time is the same as in step S42.
  • step S53 When it is determined in step S53 that the illuminance is greater than or equal to the first threshold value and less than the second threshold value (step S53: YES), the control unit 25 sets the image quality parameter value related to the third image quality mode and the fourth image quality mode. An image quality parameter value between the image quality parameter values is determined (step S56).
  • the image quality parameter value setting method in step S56 is the same as the image quality parameter value setting method in step S46.
  • control unit 25 stores the image quality parameter value related to the selected image quality mode in the RAM 20 (step S57), and uses the image quality parameter. Then, the image quality of the input video is changed (step S58), and the process ends.
  • the type and illuminance of the video are detected, and the image quality mode and the image quality parameter suitable for the video type and illuminance are automatically set in the first embodiment. It can be set up more finely than in comparison. Therefore, the user does not need to select and set the optimum image quality mode and image quality parameter based on the image type and illuminance, and the image is displayed with the optimum image quality mode and image quality parameter considering the image type and illuminance. Can watch.
  • a value between the image quality parameter value according to the first image quality mode and the image quality parameter value according to the second image quality mode is set according to the illuminance, and the image quality is changed. Therefore, finer image quality setting can be performed, and the image quality mode can be gradually switched by changing the illuminance.
  • the movie mode that is the first image quality mode and the movie / living mode that is the second image quality mode are selected when the image type is movie, and if the ambient illuminance is low, the movie mode is high.
  • the movie / living mode is selected, the luminance of the movie mode is low, and the luminance of the movie / living mode is high.
  • the illuminance may be sufficiently high or slightly dim, and each image quality parameter value may be set according to the level.
  • an optimum image quality mode corresponding to the illuminance can be set.
  • the image quality mode or the image quality parameter value is not selected by selecting the existing image quality mode but only by selecting the automatic image quality mode setting function according to the present invention. Since the adjustment is automatically performed, the user does not have to determine which image quality mode and image quality parameter value should be used for the image quality setting and what the currently set image quality mode is.
  • the image quality parameter with a delay time is set. Can be prevented from changing rapidly.
  • a television receiver is given as an example of a video display device.
  • the video display device can input a plurality of videos having different characteristics
  • the present invention may be applied to portable terminals such as PDA (Personal Digital Assistance) and PND (Portable Navigation Device), various home appliances, car navigation devices, and personal computers. Further, the present invention may be applied to an STB (Set-top box).
  • PDA Personal Digital Assistance
  • PND Portable Navigation Device
  • STB Set-top box
  • the type of video may be determined based on meta information, electronic program guide information related to the video data, and the like. Needless to say, the type of video is not limited to movies, and it may be configured to discriminate types of games, dramas, news, and the like.

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Abstract

Disclosed are a video display device and a video display method which are capable of identifying the type of video and a surrounding environment and automatically setting an image quality parameter value or an image quality mode. Specifically disclosed is a video display device to which any of multiple types of video having different image quality characteristics is inputted and which changes the image quality of the inputted video using an image quality parameter value for changing the image quality of the video and displays the video the image quality of which is changed, the video display device being provided with an illumination intensity detection unit (26) which detects the brightness of a surrounding environment, and a control unit (25) which identifies the type of the video and determines the image quality parameter value on the basis of the detected brightness and the identified type of the video.

Description

映像表示装置及び映像表示方法Video display device and video display method
　本発明は、入力映像の画質を変更し、画質変更された映像を表示する映像表示装置及び映像表示方法に関する。 The present invention relates to an image display apparatus and an image display method for changing the image quality of an input image and displaying the image with the image quality changed.
　良好な画質を実現するために映像の種類又は視聴環境に応じて画質設定を変更することが可能な映像表示装置が実用化されている。該映像表示装置は、映像調整メニューを表示し、明るさ、黒レベル、コントラスト、色の濃さ、色合い、画質など画質パラメータ値の設定を受け付け、受け付けた画質パラメータ値を用いて、入力映像の画質を調整し、表示するように構成されている。 In order to realize a good image quality, a video display device capable of changing the image quality setting according to the type of video or the viewing environment has been put into practical use. The video display device displays a video adjustment menu, accepts settings of image quality parameter values such as brightness, black level, contrast, color density, hue, and image quality, and uses the received image quality parameter values to The image quality is adjusted and displayed.
　また、映像の種類に適した画質モード、例えば映画モードを有する映像表示装置が実用化されている。該映像表示装置においては、使用者は、複雑な画質パラメータ値を調整する必要が無く、映像の種類に応じて画質モードを選択するだけで、良好な画質を得ることができる。 Also, video display devices having an image quality mode suitable for the type of video, such as a movie mode, have been put into practical use. In the video display device, the user does not need to adjust complicated image quality parameter values, and can obtain a good image quality simply by selecting an image quality mode according to the type of video.
　更に、視聴環境に適した画質モード、例えば周囲を明るく保ったまま映画を見るのに適した画質モード、映画館の雰囲気を出すために周囲を暗くして映画を見るのに適した画質モードを有するテレビも実用化されている。 In addition, an image quality mode suitable for the viewing environment, such as an image quality mode suitable for watching movies while keeping the surroundings bright, and an image quality mode suitable for watching movies with dark surroundings to create a cinema atmosphere. The television that has it is also put into practical use.
特表２００１－５１５６７５号公報JP-T-2001-515675
　しかしながら、従来の映像表示装置においては、使用者自身が、画質パラメータを調整し、あるいは映像の種類及び視聴環境を判断し、手動で画質モードを設定する必要があった。このように、画質設定に手間を要し、また画質設定を行ったとしても最適な画質で映像を視聴できていない場合があるという問題があり、画質設定を自動で統合的に行うことができる映像表示装置が望まれていた。 However, in the conventional video display device, the user himself / herself has to adjust the image quality parameter or judge the video type and viewing environment and manually set the image quality mode. As described above, there is a problem that it takes time to set the image quality, and even if the image quality setting is performed, there is a problem that the video cannot be viewed with the optimum image quality, and the image quality setting can be automatically and integratedly performed. A video display device has been desired.
　なお、特許文献１には、映像の種類を自動で判別して、画質調整を行う映像表示装置が開示されているが、映像の種類及び視聴環境を総合的に判断して、画質設定又は画質モード設定を行うことはできない。 Patent Document 1 discloses a video display device that automatically determines the type of video and adjusts the image quality, but comprehensively determines the video type and viewing environment to determine the image quality setting or image quality. Mode setting is not possible.
　本発明は斯かる事情に鑑みてなされたものであり、映像の種類及び周囲環境を判別し、画質パラメータ値又は画質モードを自動で設定することができる映像表示装置及び映像表示方法を提供することを目的とする。 The present invention has been made in view of such circumstances, and provides a video display device and a video display method capable of determining the type and surrounding environment of a video and automatically setting an image quality parameter value or an image quality mode. With the goal.
　本発明に係る映像表示装置は、画質の特徴が異なる複数種類の映像のいずれかが入力され、映像の画質を変更するための画質パラメータ値を用いて、入力映像の画質を変更し、画質変更された映像を表示する映像表示装置において、周囲環境の明るさを検出する明るさ検出手段と、映像の種類を判別する判別手段と、前記明るさ検出手段にて検出された明るさ及び前記判別手段にて判別された映像の種類に基づいて、画質パラメータ値を決定する決定手段とを備えることを特徴とする。 The video display device according to the present invention receives any one of a plurality of types of video having different image quality characteristics, changes the quality of the input video using the image quality parameter value for changing the video quality, and changes the image quality In the video display device for displaying the video, the brightness detection means for detecting the brightness of the surrounding environment, the determination means for determining the type of the video, the brightness detected by the brightness detection means and the determination And determining means for determining an image quality parameter value based on the type of video discriminated by the means.
　本発明に係る映像表示装置は、一の画質パラメータ値が決定されていて、前記決定手段が他の画質パラメータ値を決定した場合、該他の画質パラメータ値を用いて入力映像の画質を変更する前に、前記一の画質パラメータ値と、前記他の画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質を変更する手段を備えることを特徴とする。 In the video display device according to the present invention, when one image quality parameter value is determined and the determining unit determines another image quality parameter value, the image quality of the input image is changed using the other image quality parameter value. Before, the image quality parameter value between the one image quality parameter value and the other image quality parameter value is used to change the image quality of the input video.
　本発明に係る映像表示装置は、前記決定手段は、異なる時点で検出された複数の明るさ又は種類に係る情報に基づいて、画質パラメータ値を決定するようにしてあることを特徴とする。 The video display device according to the present invention is characterized in that the determining means determines an image quality parameter value based on information on a plurality of brightnesses or types detected at different times.
　本発明に係る映像表示装置は、映像の画質を変更するための画質パラメータ値が関連付けられた複数の画質変更方式を記憶しており、画質の特徴が異なる複数種類の映像のいずれかが入力され、選択された画質変更方式に係る画質パラメータ値を用いて入力映像の画質を変更し、画質変更された映像を表示する映像表示装置において、周囲環境の明るさを検出する明るさ検出手段と、映像の種類を判別する判別手段と、前記明るさ検出手段にて検出された明るさ及び前記判別手段にて判別された映像の種類に基づいて、一の画質変更方式を選択する選択手段とを備えることを特徴とする。 The video display device according to the present invention stores a plurality of image quality changing methods associated with image quality parameter values for changing the image quality of the video, and any one of a plurality of types of videos having different image quality characteristics is input. Brightness detection means for detecting the brightness of the surrounding environment in a video display device that changes the quality of the input video using the image quality parameter value related to the selected image quality change method and displays the video with the changed image quality; Discriminating means for discriminating the type of video, and selection means for selecting one image quality changing method based on the brightness detected by the brightness detecting means and the type of video discriminated by the discriminating means. It is characterized by providing.
　本発明に係る映像表示装置は、一の画質変更方式が選択されていて、前記選択手段が他の画質変更方式を選択した場合、他の画質変更方式に係る画質パラメータ値を用いて入力映像の画質を変更する前に、一の画質変更方式に係る画質パラメータ値と、他の画質変更方式に係る画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質を変更する手段を備えることを特徴とする。 In the video display device according to the present invention, when one image quality changing method is selected and the selection unit selects another image quality changing method, the image quality of the input video is determined using the image quality parameter value related to the other image quality changing method. Before changing the image quality, means for changing the image quality of the input video using an image quality parameter value between the image quality parameter value related to one image quality change method and the image quality parameter value related to another image quality change method is provided. It is characterized by that.
　本発明に係る映像表示装置は、前記選択手段は、異なる時点で検出された複数の明るさ又は種類に係る情報に基づいて、一の画質変更方式を選択するようにしてあることを特徴とする。 The video display device according to the present invention is characterized in that the selection means selects one image quality change method based on information on a plurality of brightnesses or types detected at different times. .
　本発明に係る映像表示装置は、前記明るさ検出手段にて検出された明るさ、及び第１閾値を比較する手段と、前記明るさ検出手段にて検出された明るさ、及び該第１閾値より大きい第２閾値を比較する手段とを備え、前記選択手段は、明るさが第１閾値未満である場合、第１画質変更方式を選択し、明るさが第２閾値以上である場合、第２画質変更方式を選択する手段を備え、更に、明るさが第１閾値以上、第２閾値未満である場合、第１画質変更方式に係る画質パラメータ値と、第２画質変更方式に係る画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質を変更する手段を備えることを特徴とする。 The video display device according to the present invention includes a means for comparing the brightness detected by the brightness detection means and the first threshold value, the brightness detected by the brightness detection means, and the first threshold value. Means for comparing a second threshold value that is greater than the second threshold value, and the selection means selects the first image quality changing method when the brightness is less than the first threshold value, and when the brightness is greater than or equal to the second threshold value, And an image quality parameter value related to the first image quality change method and an image quality parameter related to the second image quality change method when the brightness is not less than the first threshold and less than the second threshold. Means for changing the image quality of the input video using an image quality parameter value between them.
　本発明に係る映像表示装置は、前記画質パラメータ値は、映像のコントラスト、明るさ、色の濃さ、色合い、色温度、輪郭強調、又はガンマ補正に係る値であることを特徴とする。 The video display device according to the present invention is characterized in that the image quality parameter value is a value related to video contrast, brightness, color density, hue, color temperature, contour enhancement, or gamma correction.
　本発明に係る映像表示装置は、映像のフレーム周波数を取得する手段を備え、前記判別手段は、取得されたフレーム周波数と、所定周波数とを比較する手段を備えることを特徴とする。 The video display apparatus according to the present invention includes means for acquiring a frame frequency of the video, and the determination means includes means for comparing the acquired frame frequency with a predetermined frequency.
　本発明に係る映像表示装置は、映像を構成する時系列順の複数のフレーム画又はフィールド画から、略同一のフレーム画又はフィールド画を検出する手段を備え、前記判別手段は、検出された略同一映像のフレーム画又はフィールド画が、所定規則で時系列順に配列しているか否かを判定する手段を備えることを特徴とする。 The video display device according to the present invention includes means for detecting substantially the same frame picture or field picture from a plurality of time-sequential frame pictures or field pictures constituting the video, and the discriminating means detects the substantially It is characterized by comprising means for determining whether or not frame images or field images of the same video are arranged in chronological order according to a predetermined rule.
　本発明に係る映像表示方法は、画質の特徴が異なる複数種類の映像のいずれかが入力され、映像の画質を変更するための画質パラメータ値を用いて、入力映像の画質を変更し、画質変更された映像を表示する映像表示方法において、周囲環境の明るさを検出し、映像の種類を判別し、検出された明るさ及び映像の種類に基づいて、画質パラメータ値を決定することを特徴とする。 In the video display method according to the present invention, any one of a plurality of types of video having different image quality characteristics is input, and the quality of the input video is changed using the image quality parameter value for changing the video quality of the video. In the video display method for displaying the recorded video, the brightness of the surrounding environment is detected, the type of the video is determined, and the image quality parameter value is determined based on the detected brightness and the video type. To do.
　本発明に係る映像表示方法は、映像の画質を変更するための画質パラメータ値が関連付けられた複数の画質変更方式を記憶しておき、画質の特徴が異なる複数種類の映像のいずれかが入力され、選択された画質変更方式に係る画質パラメータ値を用いて入力映像の画質を変更し、画質変更された映像を表示する映像表示方法において、周囲環境の明るさを検出し、映像の種類を判別し、検出された明るさ及び映像の種類に基づいて、一の画質変更方式を選択することを特徴とする。 The image display method according to the present invention stores a plurality of image quality change methods associated with image quality parameter values for changing the image quality of an image, and any one of a plurality of types of images having different image quality characteristics is input. In the video display method that changes the image quality of the input video using the image quality parameter value related to the selected image quality change method and displays the video with the changed image quality, the brightness of the surrounding environment is detected and the type of the video is determined Then, one image quality changing method is selected based on the detected brightness and the type of video.
　本発明にあっては、検出手段が周囲環境の明るさを検出する。検出手段は、例えば、例えば照度センサ、ＲＧＢセンサである。言うまでもなく、検出手段は、周囲環境の明るさに相当する検出ができれば、特に照度センサなどに限定されない。
　判別手段は、映像の種類を判別する。映像の種類は、映像自身の特徴、例えば、映像のフレーム周波数、映像を構成するフレーム画の配列パターン、映像の輝度、色合いなどの特徴に基づいて判別される。また、映像に付随するメタ情報、該映像に係る電子番組表情報などに基づいて、映像の種類を判別しても良い。
　そして、決定手段は、周囲環境及び映像の種類に応じて、画質パラメータを決定する。なお、画質パラメータの変更は、画質モードを変更せずにおこなっても良い。 In the present invention, the detection means detects the brightness of the surrounding environment. The detection means is, for example, an illuminance sensor or an RGB sensor. Needless to say, the detection means is not particularly limited to an illuminance sensor or the like as long as detection corresponding to the brightness of the surrounding environment can be performed.
The discrimination means discriminates the type of video. The type of video is determined based on the characteristics of the video itself, for example, the characteristics such as the frame frequency of the video, the arrangement pattern of the frame images constituting the video, the luminance of the video, and the hue. The type of video may be determined based on meta information accompanying the video, electronic program guide information related to the video, and the like.
The determining means determines the image quality parameter according to the surrounding environment and the type of video. Note that the image quality parameter may be changed without changing the image quality mode.
　本発明にあっては、一の画質パラメータ値が決定されている状態で、周囲環境の明るさ又は映像の種類が変化し、他の画質パラメータ値が選択されるべき場合になっても、一の画質パラメータ値と、他の画質パラメータ値との間にある値が、画質パラメータ値として決定される。
　従って、周囲環境又は映像の種類が変化しても、画質パラメータは急激に変化しない。 In the present invention, even when one image quality parameter value is determined, the brightness of the surrounding environment or the image type changes, and another image quality parameter value should be selected. A value between the image quality parameter value and the other image quality parameter value is determined as the image quality parameter value.
Therefore, the image quality parameter does not change abruptly even if the surrounding environment or the type of video changes.
　本発明にあっては、異なる時点で検出された複数の明るさ又は映像の種類に基づいて、画質パラメータの値を決定する。
　従って、一時的に周囲環境の明るさ又は映像の種類が変化しても、画質パラメータは急激に変化しない。 In the present invention, the value of the image quality parameter is determined based on a plurality of brightnesses or video types detected at different times.
Therefore, even if the brightness of the surrounding environment or the type of video changes temporarily, the image quality parameter does not change abruptly.
　本発明にあっては、検出手段が周囲環境の明るさを検出する。判別手段は、映像の種類を判別する。
　そして、決定手段は、周囲環境及び映像の種類に応じて、画質変更方式を決定する。 In the present invention, the detection means detects the brightness of the surrounding environment. The discrimination means discriminates the type of video.
Then, the determining means determines the image quality changing method according to the surrounding environment and the video type.
　本発明にあっては、一の画質変更方式が選択されている状態で、周囲環境の明るさ又は映像の種類が変化し、他の画質変更方式が選択されるべき場合になっても、一の画質変更方式に係る画質パラメータ値と、他の画質変更方式に係る画質パラメータ値との間にある画質パラメータ値が決定され、該画質パラメータ値を用いて入力映像の画質が変更される。
　従って、周囲環境又は映像の種類が変化しても、画質パラメータは急激に変化しない。 In the present invention, even when one image quality changing method is selected, the brightness of the surrounding environment or the type of video changes, and another image quality changing method should be selected. An image quality parameter value between an image quality parameter value related to the image quality change method and an image quality parameter value related to another image quality change method is determined, and the image quality of the input video is changed using the image quality parameter value.
Therefore, the image quality parameter does not change abruptly even if the surrounding environment or the type of video changes.
　本発明にあっては、異なる時点で検出された複数の明るさ又は映像の種類に基づいて、画質変更方式を決定する。
　従って、一時的に周囲環境の明るさ又は映像の種類が変化しても、画質変更方式は急激に変化しない。 In the present invention, the image quality changing method is determined based on a plurality of brightnesses or video types detected at different times.
Therefore, even if the brightness of the surrounding environment or the type of video changes temporarily, the image quality changing method does not change abruptly.
　本発明にあっては、明るさが第１閾値未満である場合、第１画質変更方式に係る画質パラメータを用いて入力映像の画質が変更され、明るさが第２閾値以上である場合、第２画質変更方式に係る画質パラメータを用いて入力映像の画質が変更される。また、明るさが第１閾値以上、第２閾値未満である場合、第１画質変更方式に係る画質パラメータ値と、第２画質変更方式に係る画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質が変更される。
　従って、周囲環境の明るさに応じた適切な画質変更が可能である。 In the present invention, when the brightness is less than the first threshold, the image quality of the input video is changed using the image quality parameter according to the first image quality change method, and when the brightness is equal to or greater than the second threshold, The image quality of the input video is changed using the image quality parameter relating to the 2 image quality change method. When the brightness is equal to or higher than the first threshold value and lower than the second threshold value, an image quality parameter value between the image quality parameter value related to the first image quality change method and the image quality parameter value related to the second image quality change method is used. The image quality of the input video is changed.
Accordingly, it is possible to change the image quality appropriately according to the brightness of the surrounding environment.
　本発明にあっては、周囲環境の明るさ及び映像の種類に応じて、映像のコントラスト、明るさ、色の濃さ、色合い、色温度、輪郭強調、又はガンマ補正に係る値が自動で設定される。 In the present invention, according to the brightness of the surrounding environment and the type of image, values relating to image contrast, brightness, color density, hue, color temperature, edge enhancement, or gamma correction are automatically set. Is done.
　本発明にあっては、映像のフレーム周波数と、所定周波数とを比較することによって、映像の種類を判別する。例えば、フレーム周波数と、２４Ｈｚとを比較することによって、映像が映画であるか否かを判別することができる。なお、映画に限らず、フレーム周波数及び映像の種類が関係していれば、同様にして、映像の種類を判別することが可能である。 In the present invention, the type of video is determined by comparing the frame frequency of the video with a predetermined frequency. For example, by comparing the frame frequency with 24 Hz, it can be determined whether or not the video is a movie. Note that the type of video can be determined in the same manner as long as the frame frequency and the type of video are related, not limited to movies.
　本発明にあっては、映像を構成する時系列順の複数のフレーム画又はフィールド画から、略同一のフレーム画又はフィールド画を検出し、判別手段は、検出された略同一映像のフレーム画又はフィールド画が、所定規則で時系列順に配列しているか否かを判定することによって、映像の種類を判別する。
　例えば、映画の映像のフレーム周波数が２４Ｈｚから６０Ｈｚ又は５０Ｈｚに変換されている場合、フレーム周波数に基づいて、映像の種類、特に映画であるか否かを判別することができない。ところが、フレーム周波数が上述のように変換されている場合、略同一映像のフレーム画又はフィールド画が所定規則で出現する。このため、フレーム周波数で映像の種類が判別できない場合であっても、フレーム画又はフィールド画の配列によって、映像の種類を判別することが可能である。 In the present invention, substantially the same frame image or field image is detected from a plurality of time-sequential frame images or field images constituting the video, and the discriminating means detects the frame image or the frame image of the detected substantially identical video. The type of video is determined by determining whether the field images are arranged in chronological order according to a predetermined rule.
For example, when the frame frequency of a movie image is converted from 24 Hz to 60 Hz or 50 Hz, it is not possible to determine the type of image, particularly whether it is a movie, based on the frame frequency. However, when the frame frequency is converted as described above, frame images or field images of substantially the same video appear according to a predetermined rule. Therefore, even when the type of video cannot be determined by the frame frequency, it is possible to determine the type of video by the arrangement of frame images or field images.
　本発明によれば、映像の種類及び周囲環境を判別し、画質パラメータ値又は画質モードを自動で設定することができる。 According to the present invention, the type of image and the surrounding environment can be determined, and the image quality parameter value or the image quality mode can be automatically set.
本実施の形態１に係る映像表示装置の一構成例を示したブロック図である。It is the block diagram which showed the example of 1 structure of the video display apparatus concerning this Embodiment 1. FIG. 画質モード変更に係る制御部の処理手順を示すフローチャートである。It is a flowchart which shows the process sequence of the control part which concerns on image quality mode change. 映画判別の方法を概念的に示す説明図であって、フレーム周波数が２４Ｈｚである映画の映像を構成するフレーム画を概念的に示している。It is explanatory drawing which shows the movie discrimination method notionally, Comprising: The frame image which comprises the image | video of the movie whose frame frequency is 24 Hz is shown notionally. 映画判別の方法を概念的に示す説明図であって、２４Ｈｚから６０Ｈｚに変換（プルダウン）された映画の映像を構成するフレーム画を概念的に示している。映画判別の方法を概念的に示す説明図である。It is explanatory drawing which shows the method of a movie discrimination | determination conceptually, Comprising: The frame image which comprises the image | video of the movie converted (pull-down) from 24Hz to 60Hz is shown notionally. It is explanatory drawing which shows the method of movie discrimination | determination conceptually. 実施の形態２における画質モード変更に係る制御部の処理手順を示すフローチャートである。11 is a flowchart illustrating a processing procedure of a control unit according to an image quality mode change in the second embodiment. 実施の形態２における画質モード変更に係る制御部の処理手順を示すフローチャートである。11 is a flowchart illustrating a processing procedure of a control unit according to an image quality mode change in the second embodiment. 実施の形態２における画質モード変更に係る制御部の処理手順を示すフローチャートである。11 is a flowchart illustrating a processing procedure of a control unit according to an image quality mode change in the second embodiment. 照度の平滑化処理を概念的に示す説明図である。It is explanatory drawing which shows the smoothing process of illumination intensity notionally. 遅延時間を設けて画質パラメータを決定する方法を概念的に示す説明図である。It is explanatory drawing which shows notionally the method of providing a delay time and determining an image quality parameter. 照度及び画質パラメータとの関係を概念的に示した説明図である。It is explanatory drawing which showed notionally the relationship between illumination intensity and an image quality parameter.
　以下、本発明をその実施の形態を示す図面に基づいて詳述する。
（実施の形態１）
　図１は、本実施の形態１に係る映像表示装置の一構成例を示したブロック図である。本実施の形態１に係る映像表示装置は、周囲環境及び入力映像の種類を判別し、画質モード（画質変更方式）及び画質パラメータ値を自動で設定することを可能にしたものである。 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a video display apparatus according to the first embodiment. The video display apparatus according to the first embodiment is capable of discriminating the surrounding environment and the type of input video, and automatically setting the image quality mode (image quality changing method) and the image quality parameter value.
　本実施の形態１に係る映像表示装置は、アナログチューナ部１、映像音声抽出部２、デジタルチューナ部３、デジタル復調部４、分離部５、映像復号部６、映像選択部７、映像処理部８、合成部９、映像出力変換部１０、映像表示部１１、通信部１２、ＩＰ放送チューナ部１３、ＥＰＧ・ＯＳＤ・予約処理部１４、音声復号部１５、音声選択部１６、音声出力変換部１７、スピーカ１８を備える。 The video display apparatus according to the first embodiment includes an analog tuner unit 1, a video / audio extraction unit 2, a digital tuner unit 3, a digital demodulation unit 4, a separation unit 5, a video decoding unit 6, a video selection unit 7, and a video processing unit. 8, synthesis unit 9, video output conversion unit 10, video display unit 11, communication unit 12, IP broadcast tuner unit 13, EPG / OSD / reservation processing unit 14, audio decoding unit 15, audio selection unit 16, audio output conversion unit 17 and a speaker 18 are provided.
　また、映像表示装置は、映像表示に係る各構成部２８の動作を制御する制御装置部２９を備える。制御装置部２９は、バス２２を介して接続された選局部１９、ＲＡＭ２０、ＲＯＭ２１、通信制御部２３、遠隔操作信号受光部２４、制御部２５、照度検出部２６を備える。 Further, the video display device includes a control device unit 29 that controls the operation of each component unit 28 related to video display. The control device unit 29 includes a channel selection unit 19, a RAM 20, a ROM 21, a communication control unit 23, a remote operation signal light receiving unit 24, a control unit 25, and an illuminance detection unit 26 connected via a bus 22.
　更に、映像表示装置は、外部映像出力機器Ｃが接続される図示しない映像入力部、例えばＨＤＭＩ（High-Definition Multimedia Interface）規格に準拠したＨＤＭＩ端子を備えており、外部映像出力機器Ｃから出力された映像データ、音声データ、フレーム周波数、映像の内容を示したメタ情報など、映像に関する情報がＨＤＭＩケーブル及び映像入力部を介して入力されるように構成されている。映像データ及び音声データは、ＴＭＤＳチャンネルにてそれぞれ映像選択部７及び音声選択部１６に入力され、フレーム周波数、映像の内容を示したメタ情報などは、ＣＥＣチャンネルにて制御部２５に入力される。なお、ＨＤＭＩケーブルは通信線の一例であり、他の規格に基づくケーブルの他、６０ＧＨｚ帯のミリ波を利用した無線通信により映像データ、音声データを送受信するようにしても良い。 The video display device further includes a video input unit (not shown) to which the external video output device C is connected, for example, an HDMI terminal conforming to the HDMI (High-Definition Multimedia Interface) standard, and is output from the external video output device C. Video information such as video data, audio data, frame frequency, and meta information indicating video content is input via an HDMI cable and a video input unit. Video data and audio data are input to the video selection unit 7 and the audio selection unit 16 through the TMDS channel, respectively, and frame information, meta information indicating the video content, and the like are input to the control unit 25 through the CEC channel. . Note that the HDMI cable is an example of a communication line, and video data and audio data may be transmitted and received by wireless communication using a millimeter wave in the 60 GHz band in addition to a cable based on another standard.
　アナログチューナ部１は、アナログ放送用アンテナＡで受信したアナログ放送に係るＲＦ信号を増幅し、選局部１９からの選局指示に従って特定チャンネルの放送信号を選択するチューナであり、アナログチューナ部１は、選択した放送信号を映像音声抽出部２に与える。 The analog tuner unit 1 is a tuner that amplifies an RF signal related to analog broadcasting received by the analog broadcasting antenna A, and selects a broadcast signal of a specific channel in accordance with a channel selection instruction from the channel selection unit 19, and the analog tuner unit 1 is The selected broadcast signal is supplied to the video / audio extraction unit 2.
　映像音声抽出部２は、アナログチューナ部１によって選択された放送信号から映像データ及び音声データを抽出する。映像音声抽出部２は、抽出した映像データを映像選択部７に与え、音声データを音声選択部１６に与える。 The video / audio extraction unit 2 extracts video data and audio data from the broadcast signal selected by the analog tuner unit 1. The video / audio extraction unit 2 provides the extracted video data to the video selection unit 7 and the audio data to the audio selection unit 16.
　デジタルチューナ部３は、デジタル放送用アンテナＢで受信した、デジタル衛星放送に係るＲＦ信号又は地上デジタル放送に係わるＲＦ信号を増幅し、選局部１９からの選局指示に従って特定チャンネルの信号を選択するチューナであり、デジタルチューナ部３は、選択した信号をデジタル復調部４に与える。デジタルチューナ部３からデジタル復調部４に与えられる放送信号は、例えば、ＯＦＤＭ（Orthogonal Frequency Division Multiplexing）方式で変調されている。 The digital tuner unit 3 amplifies an RF signal related to digital satellite broadcast or an RF signal related to terrestrial digital broadcast received by the digital broadcast antenna B, and selects a signal of a specific channel according to a channel selection instruction from the channel selection unit 19. The digital tuner unit 3 is a tuner and supplies the selected signal to the digital demodulation unit 4. The broadcast signal given from the digital tuner unit 3 to the digital demodulation unit 4 is modulated by, for example, an OFDM (Orthogonal Frequency Division Multiplexing) system.
　デジタル復調部４は、デジタルチューナ部３から与えられた放送信号をＭＰＥＧ２ＴＳ（Transport Stream）形式のデータに復調し、復調したデータを分離部５に与える。ＴＳ形式のデータは、複数のパケットから構成されている。パケットは、番組の映像及び音声を構成する時系列順の映像データ及び音声データ、並びに番組配列情報などをパケット化したものであり、複数のパケットから、時系列順の映像データ及び音声データ、並びに番組配列情報が復元される。該番組配列情報は、番組の放送時刻、映像種別に関するメタ情報などを含む。
The digital demodulation unit 4 demodulates the broadcast signal given from the digital tuner unit 3 into MPEG2TS (Transport Stream) format data, and gives the demodulated data to the separation unit 5. Data in the TS format is composed of a plurality of packets. A packet is a packet of time-series video data and audio data, program sequence information, and the like that constitute video and audio of a program, and from a plurality of packets, video data and audio data in time-series order, and Program arrangement information is restored. The program arrangement information includes broadcast time of the program, meta information related to the video type, and the like.
　通信部１２は、通信制御部２３の制御に従って、ＬＡＮ、インターネットなどのＩＰ（Internet Protocol）ネットワークを介して外部のサーバコンピュータから配信される信号を受信し、受信した信号をＩＰ放送チューナ部１３に与える。なお、通信部１２は、電話回線、その他の通信網を介して、映像及び音声の信号を受信するように構成しても良い。 The communication unit 12 receives a signal distributed from an external server computer via an IP (Internet Protocol) network such as a LAN or the Internet under the control of the communication control unit 23, and sends the received signal to the IP broadcast tuner unit 13. give. Note that the communication unit 12 may be configured to receive video and audio signals via a telephone line or other communication network.
　ＩＰ放送チューナ部１３は、通信部１２から与えられた信号から、選局部１９の選局指示に従って特定チャンネルの放送信号を選択し、選択された放送信号を復調ないし復号し、復号されたデータを分離部５に与える。該データは、デジタル復調部４にて復号されたデータと同様である。 The IP broadcast tuner unit 13 selects a broadcast signal of a specific channel from the signal given from the communication unit 12 in accordance with a channel selection instruction from the channel selection unit 19, demodulates or decodes the selected broadcast signal, and decodes the decoded data. The separation unit 5 is provided. The data is the same as the data decoded by the digital demodulator 4.
　分離部５は、デジタル復調部４又はＩＰ放送チューナ部１３から与えられたデータから一の番組の映像データ及び音声データに係るパケットを選択し、選択したパケットからなる映像データ及び音声データを、夫々図示しない映像バッファ及び音声バッファに与える。映像バッファ及び音声バッファは、分離部５から与えられた映像データ及び音声データを夫々所定のタイミングで映像復号部６及び音声復号部１５に与える。また、分離部５は、前記データから、番組配列情報に係るパケットを選択し、選択したパケットからなる番組配列情報をＥＰＧ・ＯＳＤ・予約処理部１４に与える。更に、分離部５は、前記データから、映像に関するメタ情報に係るパケットを選択し、選択したパケットからなるメタ情報を制御装置部２９に与え、ＲＡＭ２０がメタ情報を記憶する。 The separation unit 5 selects a packet related to video data and audio data of one program from the data given from the digital demodulation unit 4 or the IP broadcast tuner unit 13, and the video data and audio data including the selected packet are respectively selected. This is applied to a video buffer and an audio buffer (not shown). The video buffer and the audio buffer supply the video data and audio data supplied from the separation unit 5 to the video decoding unit 6 and the audio decoding unit 15 at predetermined timings, respectively. Further, the separation unit 5 selects a packet related to the program arrangement information from the data, and gives the program arrangement information including the selected packet to the EPG / OSD / reservation processing unit 14. Further, the separation unit 5 selects a packet related to the meta information about the video from the data, gives the meta information including the selected packet to the control unit 29, and the RAM 20 stores the meta information.
　映像復号部６は、分離部５によって分離された映像データを、ＭＰＥＧ２の圧縮伸張方式に従って復号し、復号した映像データを図示しないバッファメモリを介して映像選択部７に与える。また、映像復号部６は、映像データを制御装置部２９に与え、ＲＡＭ２０が映像データを記憶する。 The video decoding unit 6 decodes the video data separated by the separation unit 5 in accordance with the MPEG2 compression / decompression method, and provides the decoded video data to the video selection unit 7 via a buffer memory (not shown). Further, the video decoding unit 6 gives video data to the control device unit 29, and the RAM 20 stores the video data.
　映像選択部７は、映像音声抽出部２、映像復号部６又は外部映像出力機器Ｃから与えられた映像データの内、一つの映像データを制御部２５からの指示に従って選択し、選択された映像データを映像処理部８に与える。なお、２画面表示など、必要に応じて、２つの映像データを映像処理部８に与えても良い。 The video selection unit 7 selects one video data from the video data supplied from the video / audio extraction unit 2, the video decoding unit 6 or the external video output device C in accordance with an instruction from the control unit 25, and selects the selected video. Data is given to the video processing unit 8. Note that two pieces of video data may be given to the video processing unit 8 as necessary, such as a two-screen display.
　映像処理部８は、映像選択部７から与えられた映像データに係る映像の画質を、制御部２５から与えられた画質パラメータ値に従って変更、つまり画質補正を施し、画質変更された映像データを合成部９に与える。例えば、制御部２５から与えられたコントラスト、明るさ、色の濃さ、黒レベル、色合い、色温度、又はガンマ補正に係る値に基づいて、映像の画質を変更する。 The video processing unit 8 changes the image quality of the video related to the video data given from the video selection unit 7 according to the image quality parameter value given from the control unit 25, that is, performs image quality correction, and synthesizes the video data whose image quality has been changed. Part 9 is given. For example, the image quality of the video is changed based on the contrast, brightness, color density, black level, hue, color temperature, or gamma correction value given from the control unit 25.
　ＥＰＧ・ＯＳＤ・予約処理部１４は、分離部５から与えられた番組配列情報を復号し、復号された番組配列情報に基づいて電子番組表（EPG:ElectronicProgram Guide）を作成し、作成された電子番組表の映像データを制御部２５の指示に従って合成部９に与える。また、ＥＰＧ・ＯＳＤ・予約処理部１４は、予め用意された設定メニュー画面、音量ケージ、現在時刻、選局チャンネルなどの各種情報を描画するための映像データを合成部９に与える。更に、ＥＰＧ・ＯＳＤ・予約処理部１４は、作成された電子番組表を利用して番組の予約処理などを行う。 The EPG / OSD / reservation processing unit 14 decodes the program arrangement information given from the separation unit 5 and creates an electronic program guide (EPG: Electronic Program Guide) based on the decoded program arrangement information. The video data of the program guide is given to the synthesizing unit 9 in accordance with instructions from the control unit 25. Further, the EPG / OSD / reservation processing unit 14 gives video data for drawing various information such as a setting menu screen, volume cage, current time, and channel selection prepared in advance to the synthesizing unit 9. Further, the EPG / OSD / reservation processing unit 14 performs program reservation processing using the created electronic program guide.
　合成部９は、映像処理部８及びＥＰＧ・ＯＳＤ・予約処理部１４から与えられた映像データを合成し、合成された映像データを映像出力変換部１０に与える。なお、ＥＰＧ・ＯＳＤ・予約処理部１４から映像データが出力されていない場合、合成部９は、映像処理部８から与えられた映像データをそのまま映像出力変換部へ出力する。 The synthesizing unit 9 synthesizes the video data given from the video processing unit 8 and the EPG / OSD / reservation processing unit 14, and gives the synthesized video data to the video output conversion unit 10. When the video data is not output from the EPG / OSD / reservation processing unit 14, the synthesis unit 9 outputs the video data provided from the video processing unit 8 to the video output conversion unit as it is.
　映像出力変換部１０は、合成部９から与えられた映像データを、映像表示部１１で映像表示が可能な形式の映像信号に変換し、変換された映像信号を映像表示部１１に与える。 The video output conversion unit 10 converts the video data given from the synthesizing unit 9 into a video signal in a format that can be displayed on the video display unit 11, and gives the converted video signal to the video display unit 11.
　映像表示部１１は、例えば液晶表示装置であり、映像を表示する液晶パネルと、パネル駆動部と、液晶パネルを背面側から照明するバックライトとを備えており、合成部９から与えられた映像信号に基づいて、映像を表示する。なお、映像表示部１１は、言うまでもなく液晶表示装置に限定されることは無く、プラズマディスプレイ、有機ＥＬディスプレイなども含む。 The video display unit 11 is, for example, a liquid crystal display device, and includes a liquid crystal panel that displays video, a panel drive unit, and a backlight that illuminates the liquid crystal panel from the back side. An image is displayed based on the signal. Needless to say, the video display unit 11 is not limited to a liquid crystal display device, and includes a plasma display, an organic EL display, and the like.
　音声復号部１５は、分離部５から与えられた音声データを、所定の圧縮伸張方式、例えばＡＡＣ（Advanced Audio Coding）の圧縮伸張方式に従って復号し、復号した音声データを、所定のタイミングで音声選択部１６に与える。 The audio decoding unit 15 decodes the audio data given from the separation unit 5 according to a predetermined compression / decompression method, for example, AAC (Advanced Audio Coding) compression / decompression method, and selects the decoded audio data at a predetermined timing. Part 16 is given.
　音声選択部１６は、映像音声抽出部２、音声復号部１５又は外部映像出力機器Ｃから与えられた音声データの内、一つの音声データを制御部２５からの指示に従って選択し、選択された音声データを音声出力変換部１７に与える。 The audio selection unit 16 selects one audio data from the audio data supplied from the video / audio extraction unit 2, the audio decoding unit 15, or the external video output device C according to an instruction from the control unit 25, and selects the selected audio data. The data is given to the audio output conversion unit 17.
　音声出力変換部１７は、音声データを、スピーカ１８から音声の出力が可能な形式の音声信号に変換し、変換された音声信号をスピーカ１８に与える。 The audio output conversion unit 17 converts the audio data into an audio signal in a format in which audio can be output from the speaker 18, and gives the converted audio signal to the speaker 18.
　スピーカ１８は、音声出力変換部１７から与えられた音声信号に基づいて音声を出力する。 The speaker 18 outputs sound based on the sound signal given from the sound output conversion unit 17.
　次に、制御装置部２９の各構成を説明する。
　ＲＡＭ２０は、制御部２５の演算処理を実行する際に生ずる各種データを一時記憶するＤＲＡＭ、ＳＲＡＭなどの揮発性メモリである。 Next, each configuration of the control device unit 29 will be described.
The RAM 20 is a volatile memory such as a DRAM or SRAM that temporarily stores various data generated when the arithmetic processing of the control unit 25 is executed.
　ＲＯＭ２１は、映像表示装置の動作を制御するために必要なコンピュータプログラムを記憶したマスクＲＯＭ、ＥＥＰＲＯＭなどの不揮発性メモリである。また、ＲＯＭ２１は、映像の画質を変更するための画質パラメータ値が関連付けられ第１ないし第４画質モードを記憶する。
　第１画質モードは、いわゆる映画モードであり、視聴対象の映像が映画で、視聴環境が暗い部屋である場合に適した画質モードである。第１画質モードには、映像の諧調性、暗部再現性、フィルムの質感を重視した画質パラメータ値が関連付けられている。
　第２画質モードは、いわゆる映画・リビングモードであり、視聴対象の映像が映画で、視聴環境が明るい部屋である場合に適した画質モードである。第２画質モードには、第１画質モードに比べて、コントラストがより強調されるような画質パラメータ値が関連付けられている。
　第３画質モードは、いわゆる標準モードであり、視聴対象が映画以外の映像で、視聴環境が暗い部屋である場合に適した画質モードである。第３画質モードには、一般家庭の明るさでメリハリのある映像を実現するコントラスト感と諧調性のバランスがとれた画質になるように画質パラメータ値が関連付けられている。
　第４画質モードは、いわゆるダイナミックモードであり、視聴対象が映画以外の映像で、視聴環境が明るい部屋である場合に適した画質モードである。第４画質モードには、明るい環境でもメリハリのある映像を実現するコントラスト感を重視した画質になるよう、画質パラメータ値が関連付けられている。 The ROM 21 is a non-volatile memory such as a mask ROM or EEPROM that stores a computer program necessary for controlling the operation of the video display device. Further, the ROM 21 stores the first to fourth image quality modes in association with image quality parameter values for changing the image quality of the video.
The first image quality mode is a so-called movie mode, and is an image quality mode suitable for a case where the video to be viewed is a movie and the viewing environment is a dark room. The first image quality mode is associated with image quality parameter values that emphasize image gradation, dark area reproducibility, and film texture.
The second image quality mode is a so-called movie / living mode, and is an image quality mode suitable for a room in which the video to be viewed is a movie and the viewing environment is bright. The second image quality mode is associated with an image quality parameter value that enhances contrast more than in the first image quality mode.
The third image quality mode is a so-called standard mode, and is an image quality mode suitable for a case where the viewing target is an image other than a movie and the viewing environment is a dark room. Image quality parameter values are associated with the third image quality mode so that the image quality is balanced between contrast and gradation that achieves a sharp image with brightness of a general household.
The fourth image quality mode is a so-called dynamic mode, and is an image quality mode suitable when the object to be viewed is a video other than a movie and the viewing environment is a bright room. The fourth image quality mode is associated with an image quality parameter value so that the image quality emphasizes a contrast feeling that realizes a sharp image even in a bright environment.
　制御部２５は、ＲＯＭ２１が記憶しているコンピュータプログラムをＲＡＭ２０に読み出して実行することにより、各構成部の動作を制御し、後述の画質変更処理を実現するＣＰＵである。
　選局部１９は、制御部の制御に従って、アナログチューナ部１、デジタルチューナ部３及びＩＰ放送チューナ部１３に対して選局の指示を与える回路である。
　通信制御部２３は、制御部の制御に従って、通信部によるＩＰ放送の受信を制御する回路である。
　遠隔操作信号受光部２４は、遠隔操作装置２７から送信された遠隔操作信号を受信する受光素子であり、受光して得た遠隔操作信号を制御部２５に与える。
　照度検出部２６は、例えば、硫化カドミウムを基板の上に焼結してなるＣｄＳセルを備えたＣＤＳセンサであり、映像表示部１１の周縁近傍に配されている。照度検出部２６は、周囲環境の明るさ、例えば照度を検出し、検出した照度を示す信号（以下、照度という）を制御部２５に与える。なお、照度検出部２６に代えて、ＲＧＢ検出部を用いても良い。また、照度検出部２６の設置位置は、映像表示部１１の周縁近傍に限定されず、例えば、遠隔操作装置２７に設けても良い。 The control unit 25 is a CPU that controls the operation of each component unit by reading the computer program stored in the ROM 21 into the RAM 20 and executing it, thereby realizing image quality change processing described later.
The channel selection unit 19 is a circuit that gives a channel selection instruction to the analog tuner unit 1, the digital tuner unit 3, and the IP broadcast tuner unit 13 under the control of the control unit.
The communication control unit 23 is a circuit that controls reception of the IP broadcast by the communication unit in accordance with the control of the control unit.
The remote operation signal light receiving unit 24 is a light receiving element that receives a remote operation signal transmitted from the remote operation device 27, and provides the control unit 25 with a remote operation signal obtained by receiving the light.
The illuminance detection unit 26 is a CDS sensor including a CdS cell formed by sintering cadmium sulfide on a substrate, for example, and is disposed near the periphery of the video display unit 11. The illuminance detection unit 26 detects the brightness of the surrounding environment, for example, illuminance, and gives a signal indicating the detected illuminance (hereinafter referred to as illuminance) to the control unit 25. Instead of the illuminance detection unit 26, an RGB detection unit may be used. Further, the installation position of the illuminance detection unit 26 is not limited to the vicinity of the periphery of the video display unit 11, and may be provided in the remote operation device 27, for example.
　図２は、画質モード変更に係る制御部２５の処理手順を示すフローチャートである。まず、制御部２５は、フレーム周波数を取得する（ステップＳ１１）。具体的には、制御部２５は、例えばＨＤＭＩケーブルのＣＥＣチャンネルを介して外部映像出力機器Ｃからフレーム周波数を取得することができる。また、制御部２５は、分離部５で分離された映像に関する情報からフレーム周波数を取得する。 FIG. 2 is a flowchart showing a processing procedure of the control unit 25 according to the image quality mode change. First, the control unit 25 acquires a frame frequency (step S11). Specifically, the control unit 25 can acquire the frame frequency from the external video output device C via, for example, the CEC channel of the HDMI cable. In addition, the control unit 25 acquires the frame frequency from the information regarding the video separated by the separation unit 5.
　そして、制御部２５は、入力映像のフレーム周波数が２４Ｈｚであるか否かを判定する（ステップＳ１２）。一般的に、映画の映像のフレーム周波数は２４Ｈｚであるため、映像データのフレーム周波数が２４Ｈｚであるか否かを判定することによって、入力映像が映画の映像であるか否かを判定することができる。なお、ここでは、映像の種類として、特に暗部再現性、諧調性が重視される映画の判別を行っている。なお、映像の種類として映画を例示しているが、一例に過ぎず、ゲーム、ドラマ、ニュースなど、画質モードを変更することが好ましい映像の種類を判別するように構成しても良い。 And the control part 25 determines whether the frame frequency of an input image | video is 24 Hz (step S12). Generally, since the frame frequency of a movie image is 24 Hz, it can be determined whether or not the input image is a movie image by determining whether or not the frame frequency of the image data is 24 Hz. it can. It should be noted that, here, as a type of video, a movie in which dark part reproducibility and gradation are particularly important is determined. In addition, although the movie is illustrated as a kind of image | video, it is only an example and you may comprise so that the kind of image | video which it is preferable to change image quality modes, such as a game, a drama, and news may be discriminate | determined.
　フレーム周波数が２４Ｈｚで無いと判定した場合（ステップＳ１２：ＮＯ）、制御部２５は、入力映像を構成するフレーム画又はフィールド画の静止画又は動画の配列パターンを検出する（ステップＳ１３）。次いで、制御部２５は、ステップＳ１３で検出された静止画及び動画が所定パターンで配列しているか否かを判定する（ステップＳ１４）。 When it is determined that the frame frequency is not 24 Hz (step S12: NO), the control unit 25 detects a frame image or field image still image or moving image arrangement pattern constituting the input image (step S13). Next, the control unit 25 determines whether or not the still image and the moving image detected in step S13 are arranged in a predetermined pattern (step S14).
　図３Ａは、映画判別の方法を概念的に示す説明図であって、フレーム周波数が２４Ｈｚである映画の映像を構成するフレーム画を概念的に示している。図３Ｂは、映画判別の方法を概念的に示す説明図であって、２４Ｈｚから６０Ｈｚに変換（プルダウン）された映画の映像を構成するフレーム画を概念的に示している。入力された映像が２４Ｈｚから６０Ｈｚに変換されたものである場合、例えば、図３（ｂ）に示すように、静止画のフレーム画と、動画のフレーム画とが２枚（フレーム画１，１が配列した静止画）、１枚（フレーム画１，２が配列した動画）、１枚（フレーム画２，２が配列した静止画）、１枚（フレーム画２，３が配列した動画）・・・と規則的に配列する。ここで、静止画とは、注目する一のフレーム画と、該一のフレーム画より時系列順で一つ前のフレーム画とが略同一であるものをいう。同様に、動画とは、注目する一のフレーム画と、該一のフレーム画より時系列順で一つ前のフレーム画とが異なる映像であるものをいう。このように、静止画のフレーム画と、動画のフレーム画との配列パターンを検出することによって、映像のフレーム周波数に拘わらず、映像が映画であるか否かを判定することができる。 FIG. 3A is an explanatory diagram conceptually showing a method for discriminating a movie, and conceptually shows frame images constituting a movie image having a frame frequency of 24 Hz. FIG. 3B is an explanatory diagram conceptually showing a movie discrimination method, conceptually showing frame images constituting a movie image converted (pulled down) from 24 Hz to 60 Hz. When the input video is converted from 24 Hz to 60 Hz, for example, as shown in FIG. 3B, there are two still image frame images and moving image frame images (frame images 1, 1). Is still image), 1 sheet (moving image in which frame images 1 and 2 are arrayed), 1 sheet (still image in which frame images 2 and 2 are arrayed), 1 sheet (moving image in which frame images 2 and 3 are arrayed),・ ・ Regularly arranged. Here, the still image refers to an image in which one frame image of interest is substantially the same as the previous frame image in chronological order from the one frame image. Similarly, a moving image refers to an image in which one frame image of interest is different from the previous frame image in chronological order from the one frame image. In this manner, by detecting the arrangement pattern of the still image frame image and the moving image frame image, it is possible to determine whether the image is a movie regardless of the image frame frequency.
　ステップＳ１２でフレーム周波数が２４Ｈｚであると判定した場合（ステップＳ１２：ＹＥＳ）、又はステップＳ１４で静止画及び動画が所定パターンで配列していると判定した場合（ステップＳ１４：ＹＥＳ）、制御部２５は、照度検出部２６を用いて照度を検出する（ステップＳ１５）。そして、制御部２５は、検出された照度が、所定の閾値未満であるか否かを判定する（ステップＳ１６）。なお、閾値は、ＲＯＭ２１が記憶している。 If it is determined in step S12 that the frame frequency is 24 Hz (step S12: YES), or if it is determined in step S14 that still images and moving images are arranged in a predetermined pattern (step S14: YES), the control unit 25 Detects the illuminance using the illuminance detection unit 26 (step S15). And the control part 25 determines whether the detected illumination intensity is less than a predetermined threshold value (step S16). Note that the threshold value is stored in the ROM 21.
　照度が閾値未満であると判定した場合（ステップＳ１６：ＹＥＳ）、制御部２５は、第１画質モードを選択する（ステップＳ１７）。なお、制御部２５は、第１画質モードを選択した場合、第１画質モードに係る画質パラメータをＲＯＭ２１からＲＡＭ２０に読み出す処理を実行する。以下に説明するように、第２ないし第４画質モードが選択された場合も同様に、各画質モードに係る画質パラメータが読み出される。照度が閾値以上であると判定した場合（ステップＳ１６：ＮＯ）、制御部２５は、第２画質モードを選択する（ステップＳ１８）。 When it is determined that the illuminance is less than the threshold (step S16: YES), the control unit 25 selects the first image quality mode (step S17). Note that, when the first image quality mode is selected, the control unit 25 executes a process of reading image quality parameters related to the first image quality mode from the ROM 21 to the RAM 20. As will be described below, when the second to fourth image quality modes are selected, the image quality parameters related to each image quality mode are similarly read. When it determines with illumination intensity being more than a threshold value (step S16: NO), the control part 25 selects 2nd image quality mode (step S18).
　ステップＳ１４で、静止画及び動画が所定パターンで配列していないと判定した場合（ステップＳ１４：ＮＯ）、制御部２５は、照度検出部２６を用いて照度を検出する（ステップＳ１９）。そして、制御部２５は、検出された照度が、所定の閾値未満であるか否かを判定する（ステップＳ２０）。 If it is determined in step S14 that still images and moving images are not arranged in a predetermined pattern (step S14: NO), the control unit 25 detects illuminance using the illuminance detection unit 26 (step S19). And the control part 25 determines whether the detected illumination intensity is less than a predetermined threshold value (step S20).
　照度が閾値未満であると判定した場合（ステップＳ２０：ＹＥＳ）、制御部２５は、第３画質モードを選択する（ステップＳ２１）。照度が閾値以上であると判定した場合（ステップＳ２０：ＮＯ）、制御部２５は、第４画質モードを選択する（ステップＳ２２）。 When it is determined that the illuminance is less than the threshold (step S20: YES), the control unit 25 selects the third image quality mode (step S21). When it determines with illumination intensity being more than a threshold value (step S20: NO), the control part 25 selects 4th image quality mode (step S22).
　ステップＳ１７，Ｓ１８，Ｓ２１，Ｓ２２の処理を終えた場合、制御部２５は、選択された画質モードに係る画質パラメータ値を用いて、映像処理部８に指示を与え、入力映像の画質を変更し（ステップＳ２３）、処理を終える。 When the processes in steps S17, S18, S21, and S22 are completed, the control unit 25 gives an instruction to the video processing unit 8 using the image quality parameter value related to the selected image quality mode, and changes the image quality of the input video. (Step S23), the process ends.
　実施の形態１に係る映像表示装置及び映像表示方法にあっては、映像の種類及び照度を検出し、映像の種類及び照度に適した画質モードを自動で設定することができる。従って、使用者は、映像の種類及び照度に基づいて最適な画質モードを選択し、設定する必要が無く、映像の種類及び照度が考慮された最適な画質モードで映像を視聴することができる。 In the video display device and the video display method according to the first embodiment, the video type and illuminance can be detected, and the image quality mode suitable for the video type and illuminance can be automatically set. Therefore, the user does not need to select and set the optimum image quality mode based on the image type and illuminance, and can view the image in the optimum image quality mode in consideration of the image type and illuminance.
（実施の形態２）
　実施の形態２に係る映像表示装置の構成は、実施の形態１に係る映像表示装置の構成と同様であり、主に制御部２５の処理手順が異なるため、以下では制御部２５の処理手順について説明する。 (Embodiment 2)
The configuration of the video display device according to the second embodiment is the same as the configuration of the video display device according to the first embodiment, and the processing procedure of the control unit 25 is mainly different. explain.
　図４ないし図６は、実施の形態２における画質モード変更に係る制御部２５の処理手順を示すフローチャートである。まず、制御部２５は、フレーム周波数を取得し（ステップＳ３１）、入力映像のフレーム周波数が２４Ｈｚであるか否かを判定する（ステップＳ３２）。 4 to 6 are flowcharts showing the processing procedure of the control unit 25 according to the image quality mode change in the second embodiment. First, the control unit 25 acquires a frame frequency (step S31), and determines whether or not the frame frequency of the input video is 24 Hz (step S32).
　フレーム周波数が２４Ｈｚで無いと判定した場合（ステップＳ３２：ＮＯ）、制御部２５は、入力映像から静止画及び動画を検出する（ステップＳ３３）。具体的には、入力映像を構成する一のフレーム画を検出対象とし、検出対象である一のフレーム画と、該一のフレーム画より時系列順で一つ前のフレーム画とを比較し、略同一である場合、前記一のフレーム画を静止画として検出する。逆に、各フレーム画が相違している場合、前記一のフレーム画を動画として検出する。なお、動きベクトルの大小に基づいて、静止画及び動画の別を判定するようにしても良い。 When it is determined that the frame frequency is not 24 Hz (step S32: NO), the control unit 25 detects a still image and a moving image from the input video (step S33). Specifically, one frame image constituting the input video is set as a detection target, one frame image that is the detection target is compared with a frame image that is one time earlier than the one frame image in time series order, If they are substantially the same, the one frame image is detected as a still image. On the contrary, when each frame image is different, the one frame image is detected as a moving image. Note that the still image and the moving image may be determined based on the magnitude of the motion vector.
　そして、制御部２５は、ステップＳ３４の検出結果をＲＡＭ２０に記憶させる（ステップＳ３４）。次いで、制御部２５は、ＲＡＭ２０が記憶している、ステップＳ３４の複数の検出結果に基づいて、静止画及び動画の比率、即ち静止画として検出されたフレーム画の枚数と、動画として検出されたフレーム画の枚数との比率を示したパラメータ値Ｆｒｔを算出する（ステップＳ３５）。パラメータ値Ｆｒｔは、静止画及び動画の配列パターンの現時点における判定結果、即ち５枚のフレーム画から得られた判定結果では無く、より過去の時点の配列パターンも考慮された値である。過去の配列パターンを考慮することによって、前記配列パターンの一時的な変化によって、画質が頻繁に変化することを防止することができる。 And the control part 25 memorize | stores the detection result of step S34 in RAM20 (step S34). Next, the control unit 25 stores the ratio of the still image and the moving image, that is, the number of frame images detected as the still image and the moving image as the moving image, based on the plurality of detection results stored in the RAM 20 in step S34. A parameter value Frt indicating a ratio with the number of frame images is calculated (step S35). The parameter value Frt is not a determination result at the present time of the arrangement pattern of still images and moving images, that is, a determination result obtained from five frame images, but a value that also considers an arrangement pattern at a past time point. By considering the past arrangement pattern, it is possible to prevent the image quality from frequently changing due to the temporary change of the arrangement pattern.
　例えば、パラメータ値Ｆｒｔは、下記式（１）で表される。
　Ｆｒｔ＝（Ｆｒｔ-1×Ｆｎｔ-1＋Ｆｒ）／Ｆｎｔ…（１）
　但し、Ｆｒは、現フレーム画の判定結果である。Ｆｒは、現フレーム画が映画である場合、１の値をとり、映画でない場合０の値をとる。また、Ｆｒｔ-1は、現フレーム画の一枚前までの所定枚数のフレーム画における映画判定結果の比率、Ｆｎｔ-1は、現フレーム画の一枚前までのフレーム画の枚数、Ｆｎｔは、現フレーム画までの枚数である。映画の映像である場合Ｆｒｔの値は、例えば、３／５＝０．６になる。
　なお、上記式は、一例であり、複数の異なる時点で算出された映画判定結果の比率を、ローパスフィルタにて平滑化しても良い。つまり、映画判定結果の比率が短時間で急激に変化しないように、該比率の値を調整しても良い。また、複数の異なる時点で算出された映画判定結果の比率を単純に平均化しても良い。また、映画コンテンツの中でも静止画に近いシーンにおいては、静止画判定を続けるため、映画と判定されない可能性がある。また、映像表示装置で映画コンテンツを視聴している場合に、一時的に映像を停止する場合が考えられる。このときも、静止画判定が続き、映画判定しなくなる。そこで、映画判定中に静止画が連続的に続く場合は、次に動画と判定されるフレームが存在するまで、映画と判定し続けるということも可能である。 For example, the parameter value Frt is expressed by the following formula (1).
Frt = (Frt −1 × Fnt −1 + Fr) / Fnt (1)
Here, Fr is the determination result of the current frame image. Fr takes a value of 1 if the current frame image is a movie, and takes a value of 0 if it is not a movie. Further, Frt −1 is a ratio of the movie determination result in a predetermined number of frame images before the current frame image, Fnt −1 is the number of frame images before the current frame image, and Fnt is The number of frames up to the current frame image. In the case of a movie image, the value of Frt is, for example, 3/5 = 0.6.
Note that the above formula is an example, and the ratio of movie determination results calculated at a plurality of different times may be smoothed by a low-pass filter. That is, the ratio value may be adjusted so that the ratio of the movie determination result does not change rapidly in a short time. Further, the ratios of the movie determination results calculated at a plurality of different time points may be simply averaged. Further, in a movie content, a scene close to a still image may not be determined as a movie because still image determination is continued. Further, when movie content is viewed on the video display device, the video may be temporarily stopped. Also at this time, still image determination continues, and movie determination stops. Therefore, when still images continue continuously during movie determination, it is possible to continue to determine a movie until there is a next frame determined to be a moving image.
　そして、制御部２５は、パラメータ値Ｆｒｔが所定範囲内であるか否かを判定する（ステップＳ３６）。パラメータ値Ｆｒｔが所定範囲内にあるか否かを判定することによって、入力映像が映画であるか、それとも非映画であるかを判別することが可能になる。 Then, the control unit 25 determines whether or not the parameter value Frt is within a predetermined range (step S36). By determining whether or not the parameter value Frt is within a predetermined range, it is possible to determine whether the input video is a movie or a non-movie.
　ステップＳ３２でフレーム周波数が２４Ｈｚであると判定した場合（ステップＳ３２：ＹＥＳ）、又はステップＳ３６でパラメータ値Ｆｒｔが所定範囲内であると判定した場合（ステップＳ３６：ＹＥＳ）、制御部２５は、照度を検出する（ステップＳ３７）。ステップＳ３７で検出される照度は、検出時その瞬間の照度である。そして、制御部２５は、ステップＳ３７で検出された照度をＲＡＭ２０に記憶させる（ステップＳ３８）。 When it is determined in step S32 that the frame frequency is 24 Hz (step S32: YES), or when it is determined in step S36 that the parameter value Frt is within the predetermined range (step S36: YES), the control unit 25 determines the illuminance. Is detected (step S37). The illuminance detected in step S37 is the illuminance at the moment of detection. And the control part 25 memorize | stores the illumination intensity detected by step S37 in RAM20 (step S38).
　次いで、制御部２５は、ステップＳ３８の処理でＲＡＭ２０が記憶した複数の照度、即ち異なる時点で検出された複数の照度を用いて、照度の検出結果を平滑化する（ステップＳ３９）。 Next, the control unit 25 smoothes the detection result of the illuminance using the plurality of illuminances stored in the RAM 20 in the process of step S38, that is, the plurality of illuminances detected at different time points (step S39).
　図７は、照度の平滑化処理を概念的に示す説明図である。横軸は時間を、縦軸は照度を示している。図７中、細線は、照度検出部２６にて検出された検出時、その瞬間の照度を示しており、太線は瞬間の照度をローパスフィルタにて平滑化して得られた照度である。より具体的には、平滑化された照度は、単位時間当たりの瞬間照度の変化が一定値内になるように、値を調整することによって得られる。また、異なる複数の時点で検出された瞬間の照度の平均値を単純に算出しても良い。平滑化の方法は、瞬間照度が急激に変化しないように照度の値を変更することが可能であれば、特に限定されない。以下、ステップＳ３９の処理で平滑化された照度を、単に照度という。
　このように、照度を平滑化することによって、使用者が照度検出部２６の前を通過するなどの照度の一時的な変化に追随して画質が変化することを防止することができる。 FIG. 7 is an explanatory diagram conceptually showing the illuminance smoothing process. The horizontal axis represents time, and the vertical axis represents illuminance. In FIG. 7, the thin line indicates the illuminance at that moment when detected by the illuminance detection unit 26, and the thick line indicates the illuminance obtained by smoothing the instantaneous illuminance with a low-pass filter. More specifically, the smoothed illuminance is obtained by adjusting the value so that the change in instantaneous illuminance per unit time is within a certain value. Moreover, you may simply calculate the average value of the illuminance of the moment detected at several different time points. The smoothing method is not particularly limited as long as the illuminance value can be changed so that the instantaneous illuminance does not change abruptly. Hereinafter, the illuminance smoothed by the process of step S39 is simply referred to as illuminance.
Thus, by smoothing the illuminance, it is possible to prevent the image quality from changing following a temporary change in illuminance, such as when the user passes in front of the illuminance detection unit 26.
　次いで、制御部２５は、照度が第１閾値未満であるか否かを判定する（ステップＳ４０）。第１閾値未満であると判定した場合（ステップＳ４０：ＹＥＳ）、制御部２５は、第１画質モードを選択する（ステップＳ４１）。そして、制御部２５は、遅延時間を設けて、第１画質モードに係る画質パラメータ値を決定する（ステップＳ４２）。つまり、制御部２５は、画質パラメータ値が短時間で急激に変化しないように、画質パラメータ値を決定する。
　例えば、制御部２５は、前回の処理で決定された画質パラメータ値と、ステップＳ４２で決定すべき画質パラメータ値との差分が一定値以内であり、かつ、第１画質モードに係る画質パラメータと、ステップＳ４２で決定すべき画質パラメータ値との差分が最小になるように、画質パラメータを決定すれば良い。 Next, the control unit 25 determines whether or not the illuminance is less than the first threshold value (step S40). When it determines with it being less than a 1st threshold value (step S40: YES), the control part 25 selects 1st image quality mode (step S41). Then, the control unit 25 determines the image quality parameter value related to the first image quality mode by providing a delay time (step S42). That is, the control unit 25 determines the image quality parameter value so that the image quality parameter value does not change rapidly in a short time.
For example, the control unit 25 has a difference between the image quality parameter value determined in the previous process and the image quality parameter value to be determined in step S42 within a certain value, and the image quality parameter related to the first image quality mode, What is necessary is just to determine an image quality parameter so that the difference with the image quality parameter value which should be determined by step S42 becomes the minimum.
　図８は、遅延時間を設けて画質パラメータを決定する方法を概念的に示す説明図である。横軸は時間を、縦軸は画質パラメータを示している。映像の種類が変更された場合、例えば、第１画質モードが選択されている状態で第３画質モードに変更されることがある。しかし、ステップＳ４２の処理では、図８に示すように、第１画質モードに係る画質パラメータ値を、直ちに第３画質モードに係る画質パラメータ値に変更することはせず、遅延時間を設けて、徐々に画質パラメータ値を変更する。
　なお、第１画質モードから第３画質モードへの遷移途中で、再び第１画質モードが選択された場合も同様にして、遷移途中の画質パラメータ値を徐々に第１画質モードに係る画質パラメータ値に変更させる。 FIG. 8 is an explanatory diagram conceptually showing a method for determining an image quality parameter by providing a delay time. The horizontal axis represents time, and the vertical axis represents image quality parameters. When the type of video is changed, for example, the image quality may be changed to the third image quality mode while the first image quality mode is selected. However, in the process of step S42, as shown in FIG. 8, the image quality parameter value according to the first image quality mode is not immediately changed to the image quality parameter value according to the third image quality mode, and a delay time is provided. Gradually change the image quality parameter value.
In the same way, when the first image quality mode is selected again during the transition from the first image quality mode to the third image quality mode, the image quality parameter value during the transition is gradually changed to the image quality parameter value related to the first image quality mode. To change.
　ステップＳ４０で、照度が第１閾値以上であると判定した場合（ステップＳ４０：ＮＯ）、制御部２５は、照度が第１閾値以上、かつ第２閾値未満であるか否かを判定する（ステップＳ４３）。ステップＳ４３で否と判定した場合（ステップＳ４３：ＮＯ）、制御部２５は、第２画質モードを選択する（ステップＳ４４）。そして、制御部２５は、遅延時間を設けて、第２画質モードに係る画質パラメータ値を決定する（ステップＳ４５）。遅延時間に関する処理内容は、ステップＳ４２と同様である。 If it is determined in step S40 that the illuminance is greater than or equal to the first threshold (step S40: NO), the control unit 25 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold (step S40). S43). If it is determined as NO in step S43 (step S43: NO), the control unit 25 selects the second image quality mode (step S44). Then, the control unit 25 determines the image quality parameter value related to the second image quality mode by providing a delay time (step S45). The processing content related to the delay time is the same as in step S42.
　ステップＳ４３で、照度が第１閾値以上、かつ第２閾値未満であると判定した場合（ステップＳ４３：ＹＥＳ）、制御部２５は、第１画質モードに係る画質パラメータ値と、第２画質モードに係る画質パラメータ値との間のパラメータ値を決定する（ステップＳ４６）。 If it is determined in step S43 that the illuminance is greater than or equal to the first threshold value and less than the second threshold value (step S43: YES), the control unit 25 sets the image quality parameter value related to the first image quality mode and the second image quality mode. A parameter value between the image quality parameter values is determined (step S46).
　図９は、照度及び画質パラメータとの関係を概念的に示した説明図である。横軸は照度、縦軸は画質パラメータを示している。図９に示すように、照度が第１閾値未満である場合、第１画質モードに係る画質パラメータ値が設定される。また、照度が第２閾値以上である場合、第２画質モードに係る画質パラメータ値が設定される。そして、照度が第１閾値以上、第２閾値未満である場合、各画質モードの画質パラメータ値を用いた線形近似にて画質パラメータ値が設定される。具体的には、第１閾値をｃ１、第２閾値をｃ２、第１画質モードに係る画質パラメータ値をｐ１、第２画質モードに係る画質パラメータ値をｐ２、照度をａ、決定すべき画質パラメータ値をｐとした場合、ｐを下記式（２）で計算すれば良い。
　ｐ＝ｐ１＋（ｐ２－ｐ１）／（ｃ２－ｃ１）×（ａ－ｃ１）…（２） FIG. 9 is an explanatory diagram conceptually showing the relationship between illuminance and image quality parameters. The horizontal axis indicates the illuminance, and the vertical axis indicates the image quality parameter. As shown in FIG. 9, when the illuminance is less than the first threshold, the image quality parameter value related to the first image quality mode is set. When the illuminance is equal to or higher than the second threshold, the image quality parameter value related to the second image quality mode is set. When the illuminance is not less than the first threshold value and less than the second threshold value, the image quality parameter value is set by linear approximation using the image quality parameter value of each image quality mode. Specifically, the first threshold value is c1, the second threshold value is c2, the image quality parameter value related to the first image quality mode is p1, the image quality parameter value related to the second image quality mode is p2, the illuminance is a, and the image quality parameter to be determined When the value is p, p may be calculated by the following formula (2).
p = p1 + (p2−p1) / (c2−c1) × (a−c1) (2)
　ステップＳ３６でパラメータ値Ｆｒｔが所定範囲外であると判定した場合（ステップＳ３６：ＮＯ）、制御部２５は、照度を検出し（ステップＳ４７）、検出された照度をＲＡＭ２０に記憶させ（ステップＳ４８）、照度の検出結果を平滑化する（ステップＳ４９）。 When it is determined in step S36 that the parameter value Frt is outside the predetermined range (step S36: NO), the control unit 25 detects the illuminance (step S47), and stores the detected illuminance in the RAM 20 (step S48). The detection result of illuminance is smoothed (step S49).
　次いで、制御部２５は、照度が第１閾値未満であるか否かを判定する（ステップＳ５０）。第１閾値未満であると判定した場合（ステップＳ５０：ＹＥＳ）、制御部２５は、第３画質モードを選択する（ステップＳ５１）。そして、制御部２５は、遅延時間を設けて、第３画質モードに係る画質パラメータ値を決定する（ステップＳ５２）。遅延時間に関する処理内容は、ステップＳ４２と同様である。 Next, the control unit 25 determines whether or not the illuminance is less than the first threshold (step S50). When it determines with it being less than a 1st threshold value (step S50: YES), the control part 25 selects 3rd image quality mode (step S51). Then, the control unit 25 provides a delay time and determines an image quality parameter value related to the third image quality mode (step S52). The processing content related to the delay time is the same as in step S42.
　ステップＳ５０で、照度が第１閾値以上であると判定した場合（ステップＳ５０：ＮＯ）、制御部２５は、照度が第１閾値以上、かつ第２閾値未満であるか否かを判定する（ステップＳ５３）。ステップＳ５３で否と判定した場合（ステップＳ５３：ＮＯ）、制御部２５は、第４画質モードを選択する（ステップＳ５４）。そして、制御部２５は、遅延時間を設けて、第４画質モードに係る画質パラメータ値を決定する（ステップＳ５５）。遅延時間に関する処理内容は、ステップＳ４２と同様である。 When it is determined in step S50 that the illuminance is greater than or equal to the first threshold (step S50: NO), the control unit 25 determines whether the illuminance is greater than or equal to the first threshold and less than the second threshold (step S50). S53). When it is determined NO in step S53 (step S53: NO), the control unit 25 selects the fourth image quality mode (step S54). Then, the control unit 25 determines the image quality parameter value related to the fourth image quality mode by providing a delay time (step S55). The processing content related to the delay time is the same as in step S42.
　ステップＳ５３で、照度が第１閾値以上、かつ第２閾値未満であると判定した場合（ステップＳ５３：ＹＥＳ）、制御部２５は、第３画質モードに係る画質パラメータ値と、第４画質モードに係る画質パラメータ値との間の画質パラメータ値を決定する（ステップＳ５６）。ステップＳ５６における画質パラメータ値の設定方法は、ステップＳ４６における画質パラメータ値の設定方法と同様である。 When it is determined in step S53 that the illuminance is greater than or equal to the first threshold value and less than the second threshold value (step S53: YES), the control unit 25 sets the image quality parameter value related to the third image quality mode and the fourth image quality mode. An image quality parameter value between the image quality parameter values is determined (step S56). The image quality parameter value setting method in step S56 is the same as the image quality parameter value setting method in step S46.
　ステップＳ４２，Ｓ４５，Ｓ４６，Ｓ５２，Ｓ５５，Ｓ５６の処理を終えた場合、制御部２５は、選択された画質モードに係る画質パラメータ値をＲＡＭ２０に記憶させ（ステップＳ５７）、該画質パラメータを用いて、入力映像の画質を変更し（ステップＳ５８）、処理を終える。 When the processes of steps S42, S45, S46, S52, S55, and S56 are completed, the control unit 25 stores the image quality parameter value related to the selected image quality mode in the RAM 20 (step S57), and uses the image quality parameter. Then, the image quality of the input video is changed (step S58), and the process ends.
　実施の形態２に係る映像表示装置及び映像表示方法にあっては、映像の種類及び照度を検出し、映像の種類及び照度に適した画質モード及び画質パラメータを自動で、しかも実施の形態１に比べてよりきめ細かく設定することができる。従って、使用者は、映像の種類及び照度に基づいて最適な画質モード及び画質パラメータを選択し、設定する必要が無く、映像の種類及び照度が考慮された最適な画質モード及び画質パラメータで映像を視聴することができる。 In the video display device and the video display method according to the second embodiment, the type and illuminance of the video are detected, and the image quality mode and the image quality parameter suitable for the video type and illuminance are automatically set in the first embodiment. It can be set up more finely than in comparison. Therefore, the user does not need to select and set the optimum image quality mode and image quality parameter based on the image type and illuminance, and the image is displayed with the optimum image quality mode and image quality parameter considering the image type and illuminance. Can watch.
　また、特に実施の形態２にあっては、照度に応じて、第１画質モードに係る画質パラメータ値と、第２画質モードに係る画質パラメータ値との間の値を設定し、画質を変更するため、よりきめ細かい画質設定を行うことができ、照度の変化による画質モードの切換を徐々に行うことができる。第３及び第４画質モード間においても同様である。
　例えば、夕方、周囲照度が徐々に低くなり、画質モードを第２画質モードである映画・リビングモードから、第１画質モードである映画モードに切り換える場合、急にモードを切り換えたのでは違和感を感じてしまう。そこで、２つの画質モードを切換える場合に、画質パラメータ値の変更を徐々に行うことによって使用者の違和感を軽減することができる。
　また、例えば、第１画質モードである映画モードと、第２画質モードである映画・リビングモードとは、映像の種類が映画の場合、いずれかが選択され、周囲照度が低ければ映画モード、高ければ映画・リビングモードが選択され、映画モードは輝度が低め、映画・リビングモードは輝度が高めである。しかし、照度は、十分高い場合もあれば、若干薄暗い場合もあり、そのレベルに応じて各画質パラメータ値を設定してもよい。本実施の形態２では、照度に応じた最適な画質モードにすることができる。 Particularly in the second embodiment, a value between the image quality parameter value according to the first image quality mode and the image quality parameter value according to the second image quality mode is set according to the illuminance, and the image quality is changed. Therefore, finer image quality setting can be performed, and the image quality mode can be gradually switched by changing the illuminance. The same applies between the third and fourth image quality modes.
For example, in the evening, when the ambient illuminance gradually decreases and the image quality mode is switched from the movie / living mode, which is the second image quality mode, to the movie mode, which is the first image quality mode, it may be strange to switch the mode suddenly. End up. Therefore, when switching between the two image quality modes, the user's uncomfortable feeling can be reduced by gradually changing the image quality parameter value.
Also, for example, the movie mode that is the first image quality mode and the movie / living mode that is the second image quality mode are selected when the image type is movie, and if the ambient illuminance is low, the movie mode is high. For example, the movie / living mode is selected, the luminance of the movie mode is low, and the luminance of the movie / living mode is high. However, the illuminance may be sufficiently high or slightly dim, and each image quality parameter value may be set according to the level. In the second embodiment, an optimum image quality mode corresponding to the illuminance can be set.
　また、本実施の形態２に係る映像表示装置にあっては、既存の画質モードを選択するのでは無く、本発明に係る自動画質モード設定機能を選択するのみで、画質モードないし画質パラメータ値が自動で調整されるため、使用者は状況によってどの画質モード及び画質パラメータ値を用いて画質設定をすべきか、現在設定されている画質モードが何かといった判断を行わなくても良い。 Further, in the video display device according to the second embodiment, the image quality mode or the image quality parameter value is not selected by selecting the existing image quality mode but only by selecting the automatic image quality mode setting function according to the present invention. Since the adjustment is automatically performed, the user does not have to determine which image quality mode and image quality parameter value should be used for the image quality setting and what the currently set image quality mode is.
　更に、第１及び第３画質モード間、又は第２及び第４画質モード間で画質モードが急に切り替わったとしても、遅延時間を設けた画質パラメータを設定するように構成されているため、画質が急激に変化しないようにすることができる。 Further, even when the image quality mode is suddenly switched between the first and third image quality modes, or between the second and fourth image quality modes, the image quality parameter with a delay time is set. Can be prevented from changing rapidly.
　更にまた、照度を平滑化し、また、過去の判定結果を考慮したパラメータ値Ｆｒｔを用いることによって、映像の画質が頻繁に変化し、目視上、違和感が生じることを防止することができる。 Furthermore, by smoothing the illuminance and using the parameter value Frt in consideration of the past determination results, it is possible to prevent the image quality of the video from changing frequently and causing a sense of incongruity visually.
　なお、実施の形態１，２では映像表示装置の一例として、テレビ受像機を挙げたが、特徴が異なる複数の映像が入力し得る映像表示装置であれば、映像表示部１１を有する携帯電話機、ＰＤＡ（Personal Digital Assistance）、ＰＮＤ（Portable Navigation Device）などの携帯端末、各種家電製品、カーナビゲーション装置、パーソナルコンピュータに本発明を適用しても良い。また、ＳＴＢ（Set-top box）に本発明を適用しても良い。 In the first and second embodiments, a television receiver is given as an example of a video display device. However, if the video display device can input a plurality of videos having different characteristics, The present invention may be applied to portable terminals such as PDA (Personal Digital Assistance) and PND (Portable Navigation Device), various home appliances, car navigation devices, and personal computers. Further, the present invention may be applied to an STB (Set-top box).
　また、実施の形態１，２にあっては、映像のフレーム周波数、フレーム画の配列に基づいて映像を判別し、画質モード及び画質パラメータ値を決定する例を説明したが、映像データに付随するメタ情報、該映像データに係る電子番組表情報などに基づいて、映像の種類を判別しても良い。言うまでもなく、映像の種類は、映画に限定されず、ゲーム、ドラマ、ニュースなどの種類を判別するように構成しても良い。 In the first and second embodiments, the example in which the video is determined based on the frame frequency of the video and the arrangement of the frame images and the image quality mode and the image quality parameter value are determined has been described. The type of video may be determined based on meta information, electronic program guide information related to the video data, and the like. Needless to say, the type of video is not limited to movies, and it may be configured to discriminate types of games, dramas, news, and the like.
　今回開示された実施の形態はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上記した意味ではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiment disclosed this time is illustrative in all respects and not restrictive. The scope of the present invention is defined not by the above-described meaning but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
　１　アナログチューナ部
　２　映像音声抽出部
　３　デジタルチューナ部
　４　デジタル復調部
　５　分離部
　６　映像復号部
　７　映像選択部
　８　映像処理部
　９　合成部
　１０　映像出力変換部
　１１　映像表示部
　１２　通信部
　１３　ＩＰ放送チューナ部
　１４　ＥＰＧ・ＯＳＤ・予約処理部
　１５　音声復号部
　１６　音声選択部
　１７　音声出力変換部
　１８　スピーカ
　１９　選局部
　２０　ＲＡＭ
　２１　ＲＯＭ
　２２　バス
　２３　通信制御部
　２４　遠隔操作信号受光部
　２５　制御部
　２６　照度検出部
　２７　遠隔操作装置
　２８　各構成部
　２９　制御装置部
　Ａ　アナログ放送用アンテナ
　Ｂ　デジタル放送用アンテナ
　Ｃ　外部映像出力機器 DESCRIPTION OF SYMBOLS 1 Analog tuner part 2 Video / audio extraction part 3 Digital tuner part 4 Digital demodulation part 5 Separation part 6 Video decoding part 7 Video selection part 8 Video processing part 9 Synthesis | combination part 10 Video output conversion part 11 Video display part 12 Communication part 13 IP broadcasting Tuner unit 14 EPG / OSD / reservation processing unit 15 Audio decoding unit 16 Audio selection unit 17 Audio output conversion unit 18 Speaker 19 Tuning unit 20 RAM
21 ROM
22 Bus 23 Communication Control Unit 24 Remote Operation Signal Receiving Unit 25 Control Unit 26 Illuminance Detection Unit 27 Remote Operation Device 28 Each Component 29 Control Unit A Analog Broadcast Antenna B Digital Broadcast Antenna C External Video Output Device

Claims (12)

  1. 　画質の特徴が異なる複数種類の映像のいずれかが入力され、映像の画質を変更するための画質パラメータ値を用いて、入力映像の画質を変更し、画質変更された映像を表示する映像表示装置において、
    　周囲環境の明るさを検出する明るさ検出手段と、
    　映像の種類を判別する判別手段と、
    　前記明るさ検出手段にて検出された明るさ及び前記判別手段にて判別された映像の種類に基づいて、画質パラメータ値を決定する決定手段と
    　を備えることを特徴とする映像表示装置。     A video display device that receives any of a plurality of types of video having different image quality characteristics, changes the quality of the input video using an image quality parameter value for changing the video quality, and displays the video with the changed quality In
    Brightness detection means for detecting the brightness of the surrounding environment;
    A discriminating means for discriminating the type of video;
    An image display apparatus comprising: a determination unit that determines an image quality parameter value based on the brightness detected by the brightness detection unit and the type of image determined by the determination unit.
  2. 　一の画質パラメータ値が決定されていて、前記決定手段が他の画質パラメータ値を決定した場合、該他の画質パラメータ値を用いて入力映像の画質を変更する前に、前記一の画質パラメータ値と、前記他の画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質を変更する手段を備える
    　ことを特徴とする請求項１に記載の映像表示装置。     If one image quality parameter value is determined and the determining means determines another image quality parameter value, the image quality parameter value is changed before changing the image quality of the input video using the other image quality parameter value. The video display apparatus according to claim 1, further comprising a unit that changes an image quality of an input video using an image quality parameter value between the image quality parameter value and the other image quality parameter value.
  3. 　前記決定手段は、
    　異なる時点で検出された複数の明るさ又は種類に係る情報に基づいて、画質パラメータ値を決定するようにしてある
    　ことを特徴とする請求項１又は請求項２に記載の映像表示装置。     The determining means includes
    The video display device according to claim 1 or 2, wherein the image quality parameter value is determined based on information on a plurality of brightnesses or types detected at different times.
  4. 　映像の画質を変更するための画質パラメータ値が関連付けられた複数の画質変更方式を記憶しており、画質の特徴が異なる複数種類の映像のいずれかが入力され、選択された画質変更方式に係る画質パラメータ値を用いて入力映像の画質を変更し、画質変更された映像を表示する映像表示装置において、
    　周囲環境の明るさを検出する明るさ検出手段と、
    　映像の種類を判別する判別手段と、
    　前記明るさ検出手段にて検出された明るさ及び前記判別手段にて判別された映像の種類に基づいて、一の画質変更方式を選択する選択手段と
    　を備えることを特徴とする映像表示装置。     A plurality of image quality change methods associated with image quality parameter values for changing the image quality of the video are stored, and any one of a plurality of types of videos having different image quality characteristics is input and related to the selected image quality change method In the video display device that changes the image quality of the input video using the image quality parameter value and displays the video with the changed image quality,
    Brightness detection means for detecting the brightness of the surrounding environment;
    A discriminating means for discriminating the type of video;
    A video display device comprising: selection means for selecting one image quality changing method based on the brightness detected by the brightness detection means and the type of video discriminated by the discrimination means.
  5. 　一の画質変更方式が選択されていて、前記選択手段が他の画質変更方式を選択した場合、他の画質変更方式に係る画質パラメータ値を用いて入力映像の画質を変更する前に、一の画質変更方式に係る画質パラメータ値と、他の画質変更方式に係る画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質を変更する手段を備える
    　ことを特徴とする請求項４に記載の映像表示装置。     When one image quality changing method is selected and the selection means selects another image quality changing method, before changing the image quality of the input video using the image quality parameter value related to the other image quality changing method, 5. The image processing apparatus according to claim 4, further comprising means for changing an image quality of an input video using an image quality parameter value between an image quality parameter value related to an image quality change method and an image quality parameter value related to another image quality change method. The video display device described.
  6. 　前記選択手段は、
    　異なる時点で検出された複数の明るさ又は種類に係る情報に基づいて、一の画質変更方式を選択するようにしてある
    　ことを特徴とする請求項４又は請求項５に記載の映像表示装置。     The selection means includes
    6. The video display device according to claim 4, wherein one image quality changing method is selected based on information on a plurality of brightnesses or types detected at different times.
  7. 　前記明るさ検出手段にて検出された明るさ、及び第１閾値を比較する手段と、
    　前記明るさ検出手段にて検出された明るさ、及び該第１閾値より大きい第２閾値を比較する手段と
    　を備え、
    　前記選択手段は、
    　明るさが第１閾値未満である場合、第１画質変更方式を選択し、明るさが第２閾値以上である場合、第２画質変更方式を選択する手段を備え、
    　更に、明るさが第１閾値以上、第２閾値未満である場合、第１画質変更方式に係る画質パラメータ値と、第２画質変更方式に係る画質パラメータ値との間の画質パラメータ値を用いて、入力映像の画質を変更する手段を備える
    　ことを特徴とする請求項４から請求項６までのいずれか一項に記載の映像表示装置。     Means for comparing the brightness detected by the brightness detection means and a first threshold;
    Means for comparing the brightness detected by the brightness detection means and a second threshold value greater than the first threshold value;
    The selection means includes
    Means for selecting a first image quality changing method when the brightness is less than the first threshold, and selecting a second image quality changing method when the brightness is greater than or equal to the second threshold;
    Further, when the brightness is not less than the first threshold value and less than the second threshold value, the image quality parameter value between the image quality parameter value according to the first image quality change method and the image quality parameter value according to the second image quality change method is used. The video display apparatus according to claim 4, further comprising a unit that changes an image quality of the input video.
  8. 　前記画質パラメータ値は、映像のコントラスト、明るさ、色の濃さ、色合い、色温度、輪郭強調、又はガンマ補正に係る値である
    　ことを特徴とする請求項１から請求項７までのいずれか一項に記載の映像表示装置。     The image quality parameter value is a value relating to contrast, brightness, color density, hue, color temperature, edge enhancement, or gamma correction of an image. The video display device according to one item.
  9. 　映像のフレーム周波数を取得する手段を備え、
    　前記判別手段は、
    　取得されたフレーム周波数と、所定周波数とを比較する手段を備える
    　ことを特徴とする請求項１から請求項８までのいずれか一項に記載の映像表示装置。     Means for obtaining the frame frequency of the video,
    The discrimination means includes
    The video display device according to any one of claims 1 to 8, further comprising means for comparing the acquired frame frequency with a predetermined frequency.
  10. 　映像を構成する時系列順の複数のフレーム画又はフィールド画から、略同一のフレーム画又はフィールド画を検出する手段を備え、
    　前記判別手段は、
    　検出された略同一映像のフレーム画又はフィールド画が、所定規則で時系列順に配列しているか否かを判定する手段を備える
    　ことを特徴とする請求項１から請求項９までのいずれか一項に記載の映像表示装置。     Means for detecting substantially the same frame image or field image from a plurality of frame images or field images in chronological order constituting the video;
    The discrimination means includes
    The means for determining whether the detected frame image or field image of substantially the same video is arranged in time-sequential order according to a predetermined rule is provided. The video display device described in 1.
  11. 　画質の特徴が異なる複数種類の映像のいずれかが入力され、映像の画質を変更するための画質パラメータ値を用いて、入力映像の画質を変更し、画質変更された映像を表示する映像表示方法において、
    　周囲環境の明るさを検出し、
    　映像の種類を判別し、
    　検出された明るさ及び映像の種類に基づいて、画質パラメータ値を決定する
    　ことを特徴とする映像表示方法。     A video display method in which any one of a plurality of types of video having different image quality characteristics is input, the quality of the input video is changed using the image quality parameter value for changing the video quality, and the video with the changed quality is displayed. In
    Detect the brightness of the surrounding environment,
    Determine the type of video,
    An image display method characterized by determining an image quality parameter value based on detected brightness and image type.
  12. 　映像の画質を変更するための画質パラメータ値が関連付けられた複数の画質変更方式を記憶しておき、画質の特徴が異なる複数種類の映像のいずれかが入力され、選択された画質変更方式に係る画質パラメータ値を用いて入力映像の画質を変更し、画質変更された映像を表示する映像表示方法において、
    　周囲環境の明るさを検出し、
    　映像の種類を判別し、
    　検出された明るさ及び映像の種類に基づいて、一の画質変更方式を選択する
    　ことを特徴とする映像表示方法。
          A plurality of image quality change methods associated with image quality parameter values for changing the image quality of the video are stored, and one of a plurality of types of videos having different image quality characteristics is input and related to the selected image quality change method. In an image display method for changing the image quality of an input image using an image quality parameter value and displaying the image with the image quality changed,
    Detect the brightness of the surrounding environment,
    Determine the type of video,
    An image display method, wherein one image quality changing method is selected based on the detected brightness and image type.
PCT/JP2010/061440 2009-07-06 2010-07-06 Video display device and video display method WO2011004804A1 (en)

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