WO2011004804A1 - Dispositif d'affichage vidéo et procédé d'affichage vidéo - Google Patents

Dispositif d'affichage vidéo et procédé d'affichage vidéo Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
image quality
video
image
parameter value
quality parameter
Prior art date
Application number
PCT/JP2010/061440
Other languages
English (en)
Japanese (ja)
Inventor
哲夫 池山
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2011004804A1 publication Critical patent/WO2011004804A1/fr

Links

Images

Classifications

    • 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.

Abstract

L'invention concerne un dispositif d'affichage vidéo et un procédé d'affichage vidéo qui sont capables d'identifier le type de vidéo et un milieu environnant et de régler automatiquement une valeur d'un paramètre de qualité d'image ou un mode de qualité d'image. Plus spécifiquement, un dispositif d'affichage vidéo est présenté, qui reçoit l'un quelconque parmi de multiples types de vidéo, possédant différentes caractéristiques de qualité d'image et qui change la qualité d'image de la vidéo d'entrée par utilisation d'une valeur de paramètre de qualité d'image pour changer la qualité d'image de la vidéo et affiche la vidéo dont la qualité d'image a été changée. Le dispositif d'affichage vidéo est doté d'une unité de détection d'intensité d'éclairement (26) qui détecte la luminosité d'un milieu environnant et une unité de commande (25) qui identifie le type de la vidéo et détermine la valeur du paramètre de qualité d'image sur la base de la luminosité détectée et du type identifié de la vidéo.
PCT/JP2010/061440 2009-07-06 2010-07-06 Dispositif d'affichage vidéo et procédé d'affichage vidéo WO2011004804A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-160126 2009-07-06
JP2009160126 2009-07-06

Publications (1)

Publication Number Publication Date
WO2011004804A1 true WO2011004804A1 (fr) 2011-01-13

Family

ID=43429228

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/061440 WO2011004804A1 (fr) 2009-07-06 2010-07-06 Dispositif d'affichage vidéo et procédé d'affichage vidéo

Country Status (1)

Country Link
WO (1) WO2011004804A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2527738A (en) * 2014-05-12 2016-01-06 Apical Ltd Method and apparatus for controlling a display

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6315226A (ja) * 1986-07-08 1988-01-22 Canon Inc 光源制御装置
JPH05313626A (ja) * 1992-05-14 1993-11-26 Matsushita Electric Ind Co Ltd 表示装置
JPH11341394A (ja) * 1998-05-21 1999-12-10 Toshiba Corp テレビジョン受像機
JP2006072255A (ja) * 2004-09-06 2006-03-16 Sony Corp 表示装置
JP2008135801A (ja) * 2006-11-27 2008-06-12 Seiko Epson Corp 投写型表示装置、投写表示方法、及び、投写表示制御プログラム
WO2008117366A1 (fr) * 2007-03-23 2008-10-02 Pioneer Corporation Dispositif de support d'ajustement de qualité d'image, unité de traitement de signal vidéo, et procédé de support d'ajustement de qualité d'image
JP2008301382A (ja) * 2007-06-04 2008-12-11 Panasonic Corp 投写型表示装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6315226A (ja) * 1986-07-08 1988-01-22 Canon Inc 光源制御装置
JPH05313626A (ja) * 1992-05-14 1993-11-26 Matsushita Electric Ind Co Ltd 表示装置
JPH11341394A (ja) * 1998-05-21 1999-12-10 Toshiba Corp テレビジョン受像機
JP2006072255A (ja) * 2004-09-06 2006-03-16 Sony Corp 表示装置
JP2008135801A (ja) * 2006-11-27 2008-06-12 Seiko Epson Corp 投写型表示装置、投写表示方法、及び、投写表示制御プログラム
WO2008117366A1 (fr) * 2007-03-23 2008-10-02 Pioneer Corporation Dispositif de support d'ajustement de qualité d'image, unité de traitement de signal vidéo, et procédé de support d'ajustement de qualité d'image
JP2008301382A (ja) * 2007-06-04 2008-12-11 Panasonic Corp 投写型表示装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2527738A (en) * 2014-05-12 2016-01-06 Apical Ltd Method and apparatus for controlling a display
GB2527738B (en) * 2014-05-12 2020-08-12 Apical Ltd Method and apparatus for controlling a display

Similar Documents

Publication Publication Date Title
JP5643964B2 (ja) ビデオ装置、及び、方法
US8072544B2 (en) Video output apparatus and control method thereof
CN101646042B (zh) 图像处理设备和图像处理方法
JP5013832B2 (ja) 映像制御装置及びその方法
KR102317035B1 (ko) 디스플레이 디바이스 및 그 제어 방법
US8520008B2 (en) Picture display device
US20080211830A1 (en) Apparatus and Method for Video Signal Conversion
JP2002158941A (ja) 画質制御装置
JP3819870B2 (ja) 画像表示装置
WO2011004804A1 (fr) Dispositif d'affichage vidéo et procédé d'affichage vidéo
US8169552B2 (en) Television receiver
JP2009116254A (ja) 表示装置及び表示システム
JP2011166315A (ja) 表示装置、表示装置の制御方法、プログラム及び記録媒体
JP5001601B2 (ja) デジタル情報表示装置、デジタル情報表示装置における表示方法及びプログラム
US20070296876A1 (en) Liquid crystal receiving apparatus
JP2008135801A (ja) 投写型表示装置、投写表示方法、及び、投写表示制御プログラム
WO2011013669A1 (fr) Dispositif d’affichage, programme et support de stockage lisible par ordinateur sur lequel est enregistré un programme
JP2010008963A (ja) 画像処理装置及び方法
US20100164977A1 (en) Image display apparatus and method for correcting output image
KR100672320B1 (ko) 텔레비젼 수상기의 영상 조정 장치 및 방법
KR100731385B1 (ko) 컨트라스트와 브라이트니스를 조절하기 위한 영상표시기기및 방법
KR100614326B1 (ko) 디지털 티브이의 영상 제어 장치
WO2021052138A1 (fr) Circuit de qualité d'image, appareil de traitement d'image et procédé de détection de caractéristique de signal
KR100853729B1 (ko) 텔레비전의 밝기 조절장치 및 그 방법
JP2010016555A (ja) 画像処理装置及び画像処理方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10797115

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10797115

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP