WO2011137866A2 - Procédé, dispositif et système de traitement de signal vidéo - Google Patents

Procédé, dispositif et système de traitement de signal vidéo Download PDF

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Publication number
WO2011137866A2
WO2011137866A2 PCT/CN2011/077105 CN2011077105W WO2011137866A2 WO 2011137866 A2 WO2011137866 A2 WO 2011137866A2 CN 2011077105 W CN2011077105 W CN 2011077105W WO 2011137866 A2 WO2011137866 A2 WO 2011137866A2
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WO
WIPO (PCT)
Prior art keywords
video
video signal
unit
brightness adjustment
signal
Prior art date
Application number
PCT/CN2011/077105
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English (en)
Chinese (zh)
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WO2011137866A3 (fr
Inventor
颜栋卿
Original Assignee
华为终端有限公司
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.)
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Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to PCT/CN2011/077105 priority Critical patent/WO2011137866A2/fr
Priority to CN2011800013383A priority patent/CN102318337A/zh
Publication of WO2011137866A2 publication Critical patent/WO2011137866A2/fr
Publication of WO2011137866A3 publication Critical patent/WO2011137866A3/fr

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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
    • 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

Definitions

  • the present invention relates to the field of terminal technologies, and in particular, to a method, device and system for processing a video signal. Background technique
  • the current technical solution generally is to turn on the lighting in the room or to set the lamp as ambient lighting next to the television to increase the brightness of the environment. If the brightness and position of the lighting or the background light are not suitable, it will affect the eyes from being affected. The effect of the damage, and the lighting or backlight is turned on requires user intervention, which is inconvenient. Summary of the invention
  • the present invention provides a method, a device and a system for processing a video signal, so that when the surrounding environment is dark, the video playback device can automatically adjust the brightness of the video image according to the brightness of the ambient light, and reduce the Eye damage and does not require user intervention.
  • An embodiment of the present invention provides a method for processing a video signal, including: acquiring an electrical signal, the electrical signal is used to indicate the degree of ambient light and darkness; determining a brightness adjustment amplitude according to the electrical signal; and adjusting the amplitude according to the brightness Performing color gamut space conversion on the received video signal; outputting the converted video signal.
  • the embodiment of the present invention further provides a video signal processing apparatus, including an electrical signal acquiring unit, an input unit, a video processing unit, and an output unit;
  • the electrical signal acquisition unit is configured to acquire an electrical signal indicating a degree of brightness of the ambient light, and send the signal to the video processing unit;
  • the input unit is configured to input a video signal to the video processing unit
  • the video processing unit is configured to determine a brightness adjustment amplitude according to the electrical signal, and perform color gamut space conversion on the received video signal according to the brightness adjustment amplitude;
  • the output unit is configured to output the color gamut spatially converted video signal.
  • the embodiment of the present invention further provides a video signal processing system, which includes: an input device, a video processing device, an output device, and a light sensing unit;
  • the input module is configured to input a video signal to the video signal processing device;
  • the video processing device is configured to perform brightness adjustment processing on the video signal received by the input module, and send the video signal subjected to the brightness adjustment processing to the output a module
  • the video processing device includes an electrical signal acquisition unit, an input unit, a video processing unit, and an output unit, wherein: the electrical signal acquisition unit is configured to acquire an electrical signal indicating a degree of ambient light shading, and send the signal to the video processing Unit
  • the input unit is configured to input a video signal to the video processing unit
  • the video processing unit is configured to receive the electrical signal, determine a brightness adjustment amplitude according to the electrical signal, and perform color gamut spatial conversion on the received video signal according to the brightness adjustment amplitude; the output unit is configured to output The color gamut space converted video signal.
  • the output module is configured to output a video signal subjected to brightness adjustment processing.
  • the light sensing unit is used by the light sensing unit to sense the brightness of the ambient light, convert it into an electrical signal indicating the degree of light and darkness of the ambient light, and send it to the electrical signal acquisition unit.
  • the video playback device can automatically adjust the brightness of the video screen according to the brightness of the ambient light, so that the brightness of the video image is adapted to the brightness of the ambient light to reduce the video image and the surrounding area.
  • the contrast between the environment and the eyes reduces the damage to the eyes and does not require user intervention, which improves the user experience.
  • FIG. 1 is a schematic structural diagram of a video signal processing system in an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a video signal processing apparatus according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a video signal processing method in an embodiment of the present invention.
  • FIG. 4 is a detailed structural diagram of a video signal processing apparatus in an embodiment of the present invention.
  • FIG. 5 is a schematic diagram showing a correspondence relationship between an electric signal and an ambient light level according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram showing a corresponding relationship between a video brightness adjustment amplitude and an electric signal according to an embodiment of the present invention
  • Detailed flow chart of the signal processing method detailed description
  • the embodiment of the invention provides a method for processing a video signal.
  • the video signal processing device can automatically adjust the brightness of the video picture according to the brightness of the ambient light, so that the brightness of the video picture can be adapted to the brightness of the ambient light, and the video picture and the surrounding area are reduced.
  • the contrast between the environment and the eyes reduces the damage to the eyes and does not require user intervention, which improves the user experience.
  • Embodiments of the present invention also provide corresponding video signal processing apparatus and systems. The details are described below separately.
  • FIG. 1 is a schematic structural diagram of a video signal processing system according to an embodiment of the present invention.
  • the video signal processing system includes an input module 101, a video processing device 102, an output module 103, and a light sensing unit 104:
  • An input module 101 is coupled to the video processing device 102 for inputting a video source signal to the video processing device 102.
  • the video source signal may be a tuned radio frequency signal or a network media stream input signal.
  • the video processing device 102 is connected to the input module 101 and the output module 103 for receiving the video signal input by the input module 101, and performing brightness adjustment processing on the video signal according to the electrical signal received from the light sensing unit 104, and then The video signal subjected to the brightness adjustment processing is output to the output module 103.
  • the video signal processing apparatus may also perform processing such as encoding, decoding, descrambling, demultiplexing, analog-to-digital conversion, and the like on the video signal.
  • the output module 103 is connected to the video processing device 102, and configured to receive the brightness adjustment processed video signal output by the video processing device 102, and transmit the brightness adjustment processed video signal to the video playback device for playing, or Transfer to other video processing systems for further processing.
  • the light sensing unit 104 is configured to sense the degree of light and darkness of the environment in which the device is located, convert the light and darkness of the environment into an electrical signal indicating the degree of light and darkness of the ambient light, and convert the electrical The signal is sent to video processing device 102.
  • the light sensing unit 104 can be a light sensor or a camera.
  • the optical sensing unit 104 can be independent of the video processing device 102, such as the video and video processing device 102 is located in the set top box, and the optical sensing unit 104 is located on the television, and the optical sensing unit 104 transmits the electrical signal.
  • the light sensing unit 104 and the video processing device 102 are on the same physical physical structure, such as in a set top box.
  • the video signal processing system inputs a video signal to a video processing device through an input module, and the video processing device performs brightness adjustment processing on the video signal according to the electrical signal received from the light sensing unit, and the processed video is processed.
  • the signal is output to the output module, and the output module outputs to the video playback device or other video processing system, thereby realizing the adjustment of the brightness of the video.
  • FIG. 2 a schematic structural diagram of a video signal processing apparatus in an embodiment of the present invention is shown.
  • the video signal processing apparatus includes an electrical signal acquisition unit 201, an input unit 202, a video processing unit 203, and an output unit 204, where:
  • the electrical signal acquisition unit 201 is configured to acquire an electrical signal indicating the degree of ambient light shading, and transmit it to the video processing unit 203;
  • the input unit 202 is configured to input a video signal to the video processing unit 203;
  • the video processing unit 203 is configured to receive the electrical signal, determine a brightness adjustment amplitude according to the electrical signal, and perform color gamut spatial conversion on the received video signal according to the brightness adjustment amplitude.
  • the video processing unit 203 may be a CPU (Central Processing Unit) and/or a GPU (Graphic Processing Unit);
  • the output unit 204 is configured to output the converted video signal.
  • the video processing unit 203 includes:
  • the video codec unit 2031 is configured to perform processing such as encoding, decoding, descrambling, demultiplexing, analog-to-digital conversion, and the like on the received video signal.
  • the video codec unit 2031 may be a CPU and/or a GPU;
  • the video brightness adjusting unit 2032 is configured to determine a brightness adjustment amplitude according to the electrical signal, perform color gamut spatial conversion on the received video signal according to the brightness adjustment amplitude, and output the converted video signal to a video coding and decoding unit. 2031.
  • the video brightness adjustment unit 2032 may be a CPU or a separate hardware module.
  • the video brightness adjustment unit 2032 receives the decoded video transmission stream of the video codec unit 2031, performs brightness adjustment on the video transmission stream, and outputs the result to the video codec unit 2031 for encoding to form a playable video. signal.
  • the video signal processing apparatus may further include: a light sensing unit 205, a storage unit 206, and a high speed dynamic storage unit 207;
  • the light sensing unit 205 is configured to sense the degree of light and darkness of the environment in which the device is located, convert the light and darkness of the environment into an electrical signal indicating the degree of light and darkness of the ambient light, and send the electrical signal to the video processing unit 203.
  • the light sensing unit 205 can be a light sensor or a camera;
  • the storage unit 206 is configured to store a system program
  • the high speed dynamic storage unit 207 is configured to store temporary data, and the temporary data is buffered data during video signal processing.
  • the video signal processing device in this embodiment senses the brightness of the ambient light by the light sensing unit and converts it into a signal indicating the degree of light and darkness of the ambient light, and the video processing unit acquires the signal and is video by the video processing unit.
  • the brightness adjustment unit according to the signal to the video The signal is subjected to brightness adjustment processing so that the brightness of the video picture can be adapted to the brightness of the ambient light, thereby reducing the contrast between the video picture and the surrounding environment, and reducing the damage to the eyes.
  • FIG. 3 a flowchart of a video signal processing method in an embodiment of the present invention is provided. The method includes the following steps:
  • the brightness of the video image can be compared with the ambient light.
  • the degree of shading is adapted to reduce the contrast between the video and the surrounding environment, reducing the damage to the eyes.
  • the video signal processing apparatus includes a video processor 40 and a light sensor 41, which is a preferred embodiment of the video processing unit 203, and the light sensor 41 is a preferred implementation of the light sensing unit 205. example.
  • the video signal processing device receives the video input signal, and the video processor encodes, decodes, descrambles, demultiplexes, and performs analog-to-digital conversion on the input signal, and the ambient light is input and received according to the light sensor. The degree adjusts the brightness of the output video screen.
  • the light sensor 41 is configured to sense the brightness of the ambient light of the video signal processing device, and convert the ambient light brightness to an electrical signal indicating the brightness of the ambient light to the video amplitude adjuster 404.
  • the format of the electrical signal is determined by the device itself.
  • the electrical signal (indicated by D) corresponds to the degree of ambient light shading (indicated by L), and the correspondence is determined by the device itself.
  • the ambient light shading degree L is lower than a certain threshold (indicated by LJimen)
  • the video brightness adjustment processing is started, and when the ambient light shading degree L is higher than the threshold value, the video brightness adjustment processing is not performed.
  • the threshold can be set at the factory, or a user interface can be provided, which is determined according to the user's selection.
  • the relationship between the electrical signal D and the ambient light shading degree L is linearly corresponding as shown in FIG. 5a.
  • the video processor 40 specifically includes:
  • the descrambling and demultiplexing module 401 is configured to receive a video input signal and perform descrambling and demultiplexing processing thereon.
  • the video input signal may be a radio frequency signal or a network media stream signal, and the radio frequency signal is first tuned and demodulated and then transmitted to the descrambling and demultiplexing module 401.
  • the descrambling and demultiplexing module 401 cooperates with the smart/IC card to descramble the received scrambled signal, and demultiplexes the descrambled code stream to obtain an audio transport stream and a video transport stream, and video transmission.
  • the video decoding and processing module 402 is configured to perform decoding and video processing on the video transport stream received from the descrambling and demultiplexing module 401.
  • the video transport stream is a compressed video signal that needs to be decoded for subsequent video processing, including video size scaling, interlaced scan signal to progressive scan signal conversion, noise reduction, and the like.
  • the decoded and video processed video signal is transmitted to the timing generator 403.
  • the timing generator 403 is configured to generate clock parameters and control signals required for playing the video signal, and add the clock parameters and control signals to the video signal received by the timing generator 403, and add clock parameters and control The video signal of the signal is transmitted to the gamut space conversion mode Block 405.
  • the video amplitude adjuster 404 is configured to determine a brightness adjustment amplitude according to an electrical signal received by the light sensor 41 indicating the degree of brightness of the ambient light, the brightness adjustment amplitude corresponding to the brightness of the ambient light. Video amplitude adjuster 404 transmits the brightness adjustment amplitude to color gamut spatial conversion module 405.
  • the video amplitude adjuster 404 determines an appropriate brightness adjustment amplitude a R , a e , and 8 according to the electrical signal D transmitted by the light sensor 41, and the corresponding relationship is as shown in FIG. 5b.
  • the signal D is less than or equal to 0.2 DJJmen, it is determined that the values of a R , a G and a B are 0.2.
  • the electrical signal D is greater than 0.2 DJJmen is less than or equal to 0.4 DJJmen, it is determined that a R , a G , a B value is 0.2, when the electrical signal When D is greater than 0.4 DJJmen is less than or equal to 0.6 DJJmen, it is determined that a R , a G , and a B are 0.4.
  • the electrical signal D is greater than 0.6 DJJmen is less than or equal to 0.8 DJJmen, the a R , a G , and a B values are determined to be 0.6.
  • the electrical signal D is greater than 0.8 DJJmen is less than or equal to DJJmen, the a R , a G , and a B values are determined to be 0.8.
  • the brightness adjustment amplitude is determined by the corresponding relationship as five levels ⁇ 0.2, 0.4, 0.6, 0.8, 1.0, respectively corresponding to their respective ambient light shading levels.
  • the gamut space conversion module 405 is configured to perform color gamut spatial conversion on the video signal received from the video coding and decoding unit according to the brightness adjustment amplitude, and output the converted video signal to the video coding and decoding unit.
  • the color gamut space conversion module 405 receives the brightness adjustment amplitude from the video amplitude adjuster 404 for the degree of ambient light shading, and adjusts the amplitude to the video signal received by the timing generator 403 according to the brightness adjustment amplitude.
  • the conversion between the RGB gamut space and the YUV gamut space is performed, and the video signal after the gamut space conversion is transmitted to the video encoder 406.
  • the gamut space conversion module 405 is responsible for completing the conversion of the video signal between the RGB gamut space and the YCbCr gamut space, according to Rec. ITU-R BT.601, from Studio.
  • the conversion method of RGB to YCbCr is
  • each color component corresponding to R, B, and G is multiplied by a brightness adjustment amplitude a R , a e , a B , so that the values of the respective color components are changed to correspond The degree of light and darkness of the ambient light.
  • the video encoder 406 is configured to receive a video signal from the color gamut space conversion module 405, and perform encoding processing to form a video signal that can be used for playing. Corresponding to the video processing unit 203 in FIG.
  • the video processor 40 is also divided into a video encoding and decoding unit and a video brightness adjusting unit.
  • the video encoding and decoding unit includes descrambling and The demultiplexing module 401, the video decoding and processing module 402, the timing generator 403, the video encoder 406, and the video brightness adjusting unit include a video amplitude adjuster 404 and a color gamut space conversion module 405.
  • the brightness adjusted video signal is used for transmission to a video playback device for playback, or to other video processing systems for further processing.
  • the video signal processing apparatus in this embodiment decodes and demultiplexes the input video source signal by the descrambling and demultiplexing module, and transmits the video source signal to the video decoding and processing module, and the video decoding and processing module decodes the video signal.
  • the frequency signal is transmitted to the timing generator, and the timing generator adds a clock parameter and a control signal to the video signal, and transmits the signal to the color gamut space conversion module, and the color gamut space conversion module according to the brightness of the ambient light received by the video amplitude adjuster
  • the signal is subjected to brightness adjustment processing on the video signal received from the timing generator, so that the brightness of the video picture can be adapted to the brightness of the ambient light, thereby reducing the contrast between the video picture and the surrounding environment, and reducing the damage to the eyes.
  • FIG. 6 a detailed flowchart of a video signal processing method in an embodiment of the present invention is provided.
  • the method flow corresponds to the structural composition of the video signal processing apparatus of FIG.
  • the detailed processing of each step is completed by the corresponding modules in FIG.
  • the specific steps are:
  • the video signal may be a radio frequency signal or a network media stream signal, and the radio frequency signal needs to be subjected to tuning and demodulation processing;
  • the obtained video signal is descrambled and demultiplexed to obtain an audio transport stream and a video transport stream;
  • the obtained video transmission stream is subjected to video decoding and video size scaling, interlaced scanning signal to progressive scan signal conversion, noise reduction, and the like;
  • a clock parameter and a control signal to the decoded video signal.
  • a clock parameter and a control signal required for playing the video signal are added to the video signal after the video decoding and processing;
  • sensing the degree of light and darkness of the ambient light and converting the degree of light and darkness of the ambient light into an electrical signal capable of indicating the degree of light and darkness of the ambient light;
  • the video brightness adjustment process when the ambient light brightness degree L is lower than a certain threshold, the video brightness adjustment process is started, and when the ambient light brightness degree L is higher than the threshold, the video is not bright.
  • the threshold can be set at the factory, or a user interface can be provided, which is determined according to the user's selection. After the video brightness adjustment process is started, the corresponding ambient light brightness level is first determined according to the received electrical signal D.
  • the brightness adjustment amplitude of the brightness adjustment of the video is determined according to the received electrical signal, and the brightness adjustment amplitude corresponds to the brightness of the ambient light;
  • the appropriate brightness adjustment amplitudes a R , a e , a B are determined according to the electrical signal D, and the corresponding relationship is as shown in FIG. 5b.
  • a R is determined.
  • a G a B value is 0.2
  • a R , a G , a B value is 0.2
  • the electrical signal D is greater than 0.4 DJJmen is less than or equal to 0.6 DJJmen, determine a R , a G , a B value is 0.4.
  • a R , a G , and a B are 0.6.
  • a R , a G , a B value is 0.8.
  • the electrical signal is greater than DJJmen, it is determined that a R , a G , a B value is 1.
  • the brightness adjustment amplitude is determined to be five levels by the correspondence relationship, that is, 0.2, 0.4, 0.6, 0.8, and 1.0, respectively corresponding to their respective ambient light shading degrees.
  • the video signal with the clock parameter and the control signal is converted between the RGB gamut space and the YCbCr gamut space according to the brightness adjustment amplitude;
  • the conversion between the RGB gamut space and the YCbCr gamut space is performed according to the following formula.
  • Rec.lTU-R BT.601 specifies that the conversion method from Studio RGB to YCbCr is In order to realize the brightness adjustment of the video signal, we added the brightness adjustment amplitude in the conversion process between the above RGB gamut space and the YCbCr gamut space, and the gamut space conversion method for realizing the video brightness adjustment is:
  • each color component corresponding to R, B, and G is multiplied by a brightness adjustment amplitude a R , a e , a B , so that the values of the respective color components are changed to correspond The degree of light and darkness of the ambient light.
  • the signal after the color space conversion is subjected to encoding processing to form a video signal that can be used for playing;
  • Video output, the processed video signal is transmitted to a video playback device for playback, or transmitted to other video signal processing systems for further processing.
  • a video transmission stream and an audio transmission stream are obtained by decoding and demultiplexing the input video source signal, and then decoding, noise reduction, video scaling, and the like are performed on the video transmission stream, and clock parameters and control signals are added. And then adjusting the brightness of the video signal according to the signal indicating the degree of brightness of the ambient light, so that the brightness of the video picture can be adapted to the brightness of the ambient light, thereby reducing the contrast between the video picture and the surrounding environment, and reducing the brightness of the eye.
  • the storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

Le mode de réalisation de cette invention se rapporte au domaine technique des terminaux et plus particulièrement à un procédé et un dispositif de traitement de signal vidéo. Le mode de réalisation de cette invention concerne un procédé de traitement de signal vidéo consistant à: acquérir un signal électrique servant à indiquer la luminosité ambiante; déterminer d'après le signal électrique la valeur de réglage de la luminosité; convertir les espaces colorimétriques du signal vidéo reçu d'après la valeur de réglage de la luminosité; et émettre un signal vidéo converti. Le mode de réalisation de cette invention porte aussi sur un dispositif et un système associés au procédé de traitement de signal vidéo. Selon un mode de réalisation, un dispositif de reproduction vidéo peut automatiquement régler la luminosité d'une image télévisée d'après la luminosité ambiante en cas de luminosité sombre avec pour effet de réduire le contraste entre l'image télévisée et l'environnement, réduisant ainsi les dommages causés aux yeux.
PCT/CN2011/077105 2011-07-13 2011-07-13 Procédé, dispositif et système de traitement de signal vidéo WO2011137866A2 (fr)

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PCT/CN2011/077105 WO2011137866A2 (fr) 2011-07-13 2011-07-13 Procédé, dispositif et système de traitement de signal vidéo
CN2011800013383A CN102318337A (zh) 2011-07-13 2011-07-13 一种视频信号的处理方法、装置与系统

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CN111147783A (zh) * 2020-01-07 2020-05-12 上海万得维进出口有限公司 Hdmi传输装置上实现视频信号自动亮度调节功能的系统、方法及其应用
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