WO2007111069A1 - appareil et programme de traitement vidéo - Google Patents

appareil et programme de traitement vidéo Download PDF

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Publication number
WO2007111069A1
WO2007111069A1 PCT/JP2007/053523 JP2007053523W WO2007111069A1 WO 2007111069 A1 WO2007111069 A1 WO 2007111069A1 JP 2007053523 W JP2007053523 W JP 2007053523W WO 2007111069 A1 WO2007111069 A1 WO 2007111069A1
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WO
WIPO (PCT)
Prior art keywords
video signal
luminance
value
video
mixed
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2007/053523
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English (en)
Japanese (ja)
Inventor
Yasumasa Nishikawa
Youichi Yamada
Tatsuya Shiraishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Corp
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 Pioneer Corp filed Critical Pioneer Corp
Publication of WO2007111069A1 publication Critical patent/WO2007111069A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/265—Mixing

Definitions

  • the present invention relates to a video processing apparatus and a program for inputting a plurality of video signals and outputting a mixed video signal obtained by mixing them.
  • an audio signal adjustment device that adjusts two types of audio signals simultaneously by moving a moving member in a moving range having both ends of the A end and the B end (for example, Patent Document 1). .
  • This type of audio signal adjustment device is generally called “crossfader”, and the volume of the first audio signal increases as the moving member moves from the A end to the B end, and conversely from the B end to the A end.
  • the volume of the second audio signal increases as the moving member moves.
  • the mixing ratio of the two types of audio signals can be determined by one interface.
  • Patent Document 1 Japanese Patent Laid-Open No. 2004-5987
  • the audio signal adjusting device described above is applied to a video signal and the mixing ratio of two types of video signals can be determined by one interface.
  • the sum of the luminance ratios of the first video signal and the second video signal is always 100% (predetermined dynamic range, for example, [0 to 255]) regardless of the position of the moving member. It is configured. In other words, even if two types of video signals are mixed, the total luminance ratio does not exceed 100% (overflow). Both video signals are mixed by simply adding the luminance values of the two types of video signals. A mixed video signal can be obtained.
  • this type of video switcher is applied to VJ equipment that is used to display video with many changes on the venue monitor in clubs and the like so that a single video can be seen even in the dark. In order to enhance the atmosphere of the venue more effectively, it is desirable to display clear images.
  • the above video switcher is configured so that the total luminance rate is 100%. It cannot be mixed with a video signal with a luminance rate of 30%. In other words, there is a problem that the subtle video nuance desired by the user cannot be expressed because the setting of the luminance rate is limited.
  • users (VJs) who use VJ equipment are required to have their own unique presentation methods and various technologies, and video switchers that cannot express subtle video nuances are difficult to use.
  • an object of the present invention is to provide a video processing device and a program capable of mixing a plurality of video signals without limiting the setting of the luminance rate and without reducing the image quality. .
  • the video processing apparatus of the present invention includes input means for inputting n types (where n is an integer satisfying n ⁇ 2), and luminance for adjusting the luminance rate of each input video signal.
  • the total power of the luminance ratios of the n types of input video signals generates a mixed video signal by adding the luminance values of the video signals when the predetermined dynamic range is not exceeded. Therefore, even if the video signal adjusted to a low luminance rate is mixed, the video is not obscured.
  • a luminance value correction process that corrects the luminance value of each video signal is performed, so it is possible to mix video signals adjusted to a high luminance ratio. is there. That is, the luminance rate of each video signal can be adjusted without limitation, and a plurality of video signals can be mixed without degrading the image quality.
  • the luminance value of each video signal is corrected so that the luminance value of the mixed video signal to be generated does not exceed a predetermined dynamic range.
  • mixing video signals refers to blending a plurality of videos in a fader system on the same time series rather than alternately combining videos of a predetermined length.
  • the luminance value correction processing is a virtual image obtained by expanding the predetermined dynamic range by n times and summing the luminance values based on the luminance ratio of each adjusted video signal. Processing to generate an image signal, processing to investigate the minimum and maximum luminance values for all pixels included in the virtual video signal, and luminance values from the minimum value to the maximum value within a predetermined dynamic range It is preferable that the allocation has the power to correct the luminance value of the virtual video signal.
  • the predetermined dynamic range is expanded by a factor of n and the virtual video signal obtained by summing the luminance values of the respective video signals is temporarily stored.
  • Generated and assigned brightness values up to the minimum and maximum values among the brightness values of all the pixels included in the virtual video signal are assigned to a predetermined dynamic range, so the contrast of the virtual video signal can be increased, and as a result mixed
  • the image quality of the video signal can be improved.
  • a virtual video signal whose luminance value is corrected is output as a mixed video signal.
  • the brightness value correction process is a virtual video signal in which the brightness ratio of each video signal is corrected by lZn times and the brightness value of each video signal after correction is summed.
  • Processing for examining the minimum and maximum luminance values for all pixels included in the virtual video signal, and the luminance values from the minimum value to the maximum value are assigned to a predetermined dynamic range.
  • the luminance rate of each video signal is corrected to lZn times, and the luminance value of each corrected video signal is summed up. Since the signal is generated, no processing exceeding the specified dynamic range is required. Therefore, a wasteful work area is not required for program processing, and memory access is simplified, so that the processing speed can be improved. Also in this configuration, since the luminance values from the minimum value to the maximum value among the luminance values of all the pixels included in the virtual video signal are assigned to a predetermined dynamic range, the contrast of the virtual video signal can be increased. it can.
  • the brightness value at an arbitrary coordinate of the virtual video signal after correction by the process of correcting the brightness value of the virtual video signal is set to NEW—Y (x, y)
  • the maximum dynamic range value is DR
  • the luminance value at any coordinate of the virtual video signal before correction is IM G_Y (x, y)
  • the maximum luminance value of the virtual video signal before correction is MAX—Y
  • the virtual image before correction is virtual image.
  • the maximum luminance value M AX — Y of the virtual video signal (For example, in the case of a single-color video (image)), it becomes impossible to calculate.
  • the minimum luminance value MIN-Y is set to the luminance value of the first pixel included in the virtual video signal, it may be too large (for example, if the number of colors is small, the video (image) If the total of the adjusted luminance ratio does not exceed the dynamic range, the mixed video signal will look extremely different.
  • the value proportional to the total value of the luminance ratios of the respective video signals is set as the initial value of the minimum luminance value, all the above problems can be solved.
  • a program according to the present invention is characterized by causing a computer to function as each unit in the video processing apparatus.
  • FIG. 1 is a system configuration of a video processing system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of a video processing apparatus.
  • FIG. 3 is a diagram showing a user interface provided in the video processing apparatus.
  • FIG. 4 is a flowchart showing mixed video signal output processing.
  • FIG. 5 is a flowchart showing luminance value correction processing 1.
  • FIG. 6 is a diagram showing a calculation formula for correcting a luminance value of a virtual video signal.
  • FIG. 7 is a diagram for explaining problems of the above formula.
  • FIG. 8 is a graph showing the relationship between the initial value of the minimum luminance value of the virtual video signal used in the above formula and the total value of the luminance ratio of each adjusted video signal.
  • FIG. 9 is a flowchart showing luminance value correction processing 2 according to the second embodiment of the present invention. Explanation of symbols
  • FIG. 1 (a) is a system configuration diagram of a video processing system SY to which the video processing device 20 of the present invention is applied.
  • the video processing system SY receives video signals (video signals l to n, where n is an integer such that n ⁇ 2) to be input to the video processing device 20.
  • One or more DVD players 10 to be generated (only one is shown in the figure) and a plurality of types of video signals from the one or more DVD players 10 are mixed and mixed to obtain a mixed video signal.
  • a monitor 30 for displaying (reproducing) the mixed video signal output from the video processing device 20.
  • the video processing device 20 for example, in a club or the like, there is a VJ device or the like used for projecting video on a monitor in accordance with beaty music.
  • the device for generating a video signal to be input to the video processing device 20 is not limited to the DVD player 10, and may be other devices (such as various video devices and personal computers). . Further, the function of the DVD player 10 may be incorporated in the video processing device 20. Furthermore, the video signal may be a moving image or a still image.
  • FIG. 1B is a simplified configuration diagram of the video processing device 20.
  • the fader? CPU 22 and video control device 23 are provided.
  • the fader F adjusts the luminance rate of each video signal by moving the operation element Fa by the user.
  • the “video signal” means a signal for displaying one screen (one image).
  • the “brightness rate of each video signal” means a ratio of multiplying the original luminance value of pixels (345600 pixels in the NTSC system and 414720 pixels in the PAL system) included in each video signal.
  • the CPU 22 generates luminance rate information of each video signal based on the feeder position signal generated according to the position of the moving member of the feeder F, and outputs this to the video control device 23. .
  • the CPU 22 performs overall control of the video processing device 20 such as information management based on user operations and input / output of signals with external devices.
  • the video control device 23 adjusts the luminance rate of each video signal based on the luminance rate information input from the CPU 22, and corrects the luminance value of each pixel included in each video signal based on the adjustment. To do.
  • the luminance value of each corrected video signal is mixed to generate a mixed video signal, which is output to the monitor 30 and the like.
  • the video control device 23 buffers each video signal, performs various video processing (special effects, etc.) filtering including the above-mentioned luminance rate adjustment, and mixes (blends) each video signal. And synchronize.
  • the control configuration of the video processing device 20 will be described with reference to the block diagram of FIG.
  • the video processing device 20 includes an input unit 210, a luminance rate adjusting unit 220, a luminance rate total determining unit 230, a mixed video signal generating unit 240, and an output unit 250.
  • Input means 210 and output means 250 are not shown video signal input / output interfaces (composite terminals, component terminals, S-VIDE 0 terminals, etc., which are general video input / output terminals, or special inputs).
  • the main part is composed of a structure that captures video from USB).
  • the luminance rate adjusting means 220 is composed of a feeder F (see FIG. 1), and the luminance rate total determining means 230 and the mixed video signal generating means 240 are composed of a CPU 22 and a video control device 23.
  • the input means 210 inputs n types (where n is an integer satisfying n ⁇ 2) of video signals from one or more DVD players 10.
  • n is an integer satisfying n ⁇ 2
  • multiple types of video signals may be input from one DVD player 10, but when multiple video signals based on the same video are input, even if the video types are the same, different input signals may be input. Since it is input from the interface camera, it is treated as a different kind of video signal.
  • the luminance rate adjusting means 220 is for the user to adjust the luminance rate of each video signal input by the input means 210 using the fader F. In the present embodiment, it is assumed that the luminance rate can be adjusted when each feeder F is in the range of 0 to 100%.
  • the luminance rate total determining unit 230 determines whether or not the total power of the luminance rates of the video signals adjusted by the luminance rate adjusting unit 220 exceeds a predetermined dynamic range.
  • the mixed video signal generation means 240 generates a mixed video signal obtained by mixing n types of video signals.
  • the first mixed video signal generation means 241 and the second mixed video signal generation means 2 42 Consists of.
  • the former first mixed video signal generating unit 241 determines that the sum of the luminance rates of the respective video signals does not exceed a predetermined dynamic range (lbyte) based on the determination result of the luminance rate total determining unit 230, that is, When the total luminance rate does not exceed 100%, a mixed video signal is generated by summing the luminance values of each video signal based on the adjusted luminance rate.
  • the latter second mixed video signal generating means 242 is also capable of determining the total luminance rate.
  • step 230 If it is determined that the sum of the luminance ratios of each video signal exceeds a predetermined dynamic range (lbyte) based on the discrimination result of step 230, that is, if the total luminance ratio exceeds 100%, the luminance value of each video signal A luminance value correction process for correcting the luminance value is performed, and a mixed video signal is generated based on the correction result of the luminance value correction process.
  • the luminance value correction process will be described in detail later.
  • the output unit 250 outputs the mixed video signal generated by the first mixed video signal generating unit 241 or the second mixed video signal generating unit 242 to the monitor 30 or the like. However, when one type of video signal is not input by the input means 210, a video signal after processing that has been subjected to video processing by the video control device 23 is output rather than a mixed video signal. .
  • the video processing device 20 displays four faders F (F1 to F4) corresponding to the channels 1 to 4 and video based on the video signals input to the respective channels on the upper surface of the housing.
  • Video display units D1 to D4 luminance rate display units B1 to B4 indicating the luminance rate set by each of the faders F, a mixed video display unit Dm that displays an image based on the mixed video signal, It has.
  • the luminance rate powers of the video signals input to the channels 1 to 4 are 50%, 50%, 100%, and 0%, respectively. Therefore, the video signal (D4) input to channel 4 is not displayed on the mixed video display Dm, but the video signal (D3) input to channel 3 is a luminance value based on a 100% luminance rate.
  • the video signals (Dl, D2) input to channels 1 and 2 are mixed with luminance values based on the luminance rate of 50% and displayed on the mixed video display unit Dm.
  • the brightness value correction process 1 executed in S04 will be described with reference to the flowchart of FIG.
  • the luminance values of the four video signals of channels 1 to 4 are summed to generate a virtual video signal (S11).
  • the virtual range is 4 times (n times)
  • the virtual video signal is generated by summing the brightness values of each video signal adjusted based on the setting value (brightness rate) of each fader F! .
  • the minimum value and the maximum value of the luminance value are investigated for all the pixels included in the virtual video signal (S12), and the luminance value up to the minimum value force maximum value is determined to be a predetermined dynamic value.
  • the luminance value of the virtual video signal is corrected so as to be in 256 steps in the range [0 to 255] (S13).
  • the mixed video signal generated in step S04 corresponds to the corrected virtual video signal.
  • the luminance value correction process corresponds to an image optimization process for increasing the luminance contrast (in order to improve the image quality). Therefore, the luminance correction ratio (the luminance value of each pixel of the video signal is histogrammed so that the luminance value from the minimum value to the maximum value is [0 to 255], and the minimum value force maximum value obtained from the histogram force is obtained. Ratio to assign 256 levels), and based on the brightness correction ratio, brightness correction is performed on each pixel of the virtual video signal to generate a mixed video signal with no color jumps. Can do.
  • FIG. 6 (a) shows a calculation formula “NEW-Y” for correcting the luminance of each pixel of the virtual video signal.
  • the luminance value at an arbitrary coordinate (X, y) of each video signal is expressed as CHl_Y (x, y).
  • the problem of Case 1 occurs in the case of a single color image (image), and becomes the denominator ⁇ (zero) of the above calculation formula, which makes calculation impossible.
  • the problem in Case 2 occurs when the number of colors (video) is small, and is shifted to 0 when a pixel with the minimum luminance value of the virtual video signal is assigned to the dynamic range. Therefore, the brightness is lost (it becomes black). As a result, there is a problem that the mixed video signal generated when the total luminance rate is 100% and the mixed video signal generated when the luminance rate is 101% are extremely different.
  • FIG. 7 is a diagram for explaining the problem of case 2.
  • two-color video signals with different shades of red are input to channel 1 (in the figure, the left half is dark red and the right half is light red), and channel 2 is a single-color blue video.
  • video display D1 shows video based on the video signal input to channel 1 and video display D2 to channel 2).
  • the luminance correction processing is performed with the luminance rate of channel 1 set to 100% and the luminance rate of channel 2 set to 1%, all the pixels having the minimum luminance value of the virtual video signal are shifted to 0.
  • the mixed video display area Dm the video based on the mixed video signal with the dark red area (left half area) all changed to black is displayed.
  • the initial value of the minimum luminance value of the virtual video signal is proportional to the total value [R] of the adjusted luminance rate of each video signal.
  • the set value is set.
  • the initial value of the maximum luminance value of the virtual video signal is set to [255], which is the maximum value of a predetermined dynamic range.
  • the luminance value of each pixel is [0 to 1023]. If a value greater than [255] is detected, that value is the virtual video signal. It is substituted for the initial maximum luminance value.
  • FIG. 8 is a graph showing the relationship between the total luminance ratio [R] of each adjusted video signal and the minimum luminance value of the set virtual video signal.
  • the luminance values of the respective video signals are summed up.
  • a mixed video signal is generated, so that even if a video signal adjusted to a low luminance rate is mixed, the video is not obscured.
  • a luminance value correction process for correcting the luminance value of each video signal is performed, so that the video signal adjusted to the high luminance rate is mixed.
  • a predetermined dynamic range is expanded by a factor of n to generate a virtual video signal in which the luminance values of the respective video signals are summed, and all the pixels included in the virtual video signal are generated. Since the luminance value from the minimum value to the maximum value is assigned to a predetermined dynamic range, the contrast of the virtual video signal can be increased, and the image quality of the mixed video signal can be improved.
  • the video processing device 20 of the present embodiment adjusts the luminance rate of each video signal without limitation.
  • a plurality of video signals can be mixed without reducing image quality. Therefore, even if it is applied to VJ equipment used in clubs, etc., the atmosphere of the venue where unclear mixed images cannot be displayed is not impaired.
  • the brightness ratio of each video signal can be set from 0 to 100%, so it is possible to express subtle video nuances for VJ using VJ equipment, making it easy to use.
  • the virtual range is generated by multiplying the dynamic range by 4 times (n times) (see S11 in FIG. 5).
  • the dynamic range is expanded.
  • the brightness value correction process 2 will be described focusing on the differences from the brightness value correction process 1.
  • the luminance ratios of the four video signals of channels 1 to 4 are first increased by 1Z4 times (lZn times) so that the maximum luminance ratio of each video signal is 25%.
  • the luminance ratio of each video signal is corrected by reducing it to (S21).
  • the luminance value of each pixel included in each corrected video signal is summed to generate a virtual video signal (S22).
  • the processing after generation of the virtual video signal is the processing of S12 and S13 in Fig. 5 (the luminance value from the minimum value to the maximum value of the virtual video signal is expressed in the dynamic range [0 to 2].
  • the process is the same as the process of reallocation to [55], and the description is omitted.
  • the initial value of the minimum luminance value (MIN—Y) and the initial value of the maximum luminance value (MAX—Y) of the virtual video signal are also multiplied by lZn.
  • the luminance rate of each video signal is corrected to lZn times, and the luminance values of the corrected video signals are summed. Since the video signal is generated, processing that exceeds the specified dynamic range is not required (processing can be performed within the range that can be expressed by byte type variables). Therefore, a useless work area is not required for program processing, and memory access is simplified, so that the processing speed can be improved. Also in this implementation, among the luminance values of all the pixels included in the virtual video signal, the luminance value up to the minimum value power maximum value is assigned to a predetermined dynamic range, so that the image quality of the mixed video signal can be improved. it can.
  • the present invention can be applied to the case where two or more (plural) video signals are input.
  • the present invention can be applied to devices and programs (video mixers, video controllers, video processing applications, etc.) that can input a plurality of video signals and blend them.
  • each unit and each function in the video processing device 20 shown in the above example can be provided as a program. It is also possible to provide the program stored in a recording medium (not shown).
  • CD-ROM, flash ROM, memory card (compact flash (registered trademark), smart media, memory stick, etc.), compact disc, magneto-optical disc, digital versatile disc, flexible disc and node disc are used as recording media. be able to.
  • system configuration of the video processing system SY the device configuration of the video processing device 20, the processing steps, and the like can be appropriately changed without departing from the gist of the present invention, regardless of the above-described embodiments. is there.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

L'invention concerne un appareil de traitement vidéo ou similaire dans lequel une pluralité de signaux vidéo peuvent être mélangés sans restriction quant au réglage du rapport de luminosité et sans dégradation de la qualité de la vidéo. Un tel appareil de traitement vidéo (20) comprend: un moyen d'entrée (210) pour entrer les signaux vidéo, un moyen de réglage du rapport de luminosité (220) pour régler le rapport de luminosité de chacun des signaux vidéo entrés, un moyen d'évaluation de la somme des rapports de luminosité (230) permettant d'évaluer si la somme des rapports de luminosité reglés de chacun des signaux vidéo dépasse une plage dynamique prédéterminée, un second moyen de génération de signal vidéo mélangé (242) pour effectuer un traitement de correction de la valeur de luminosité de chacun des signaux vidéo pour générer un signal vidéo mélangé dans lequel la valeur de luminosité de chaque signal vidéo est mélangée en fonction du résultat du traitement de correction de la valeur de luminosité si la somme dépasse la plage dynamique prédéterminée, et un moyen de sortie (250) pour fournir le signal vidéo mélangé généré.
PCT/JP2007/053523 2006-03-27 2007-02-26 appareil et programme de traitement vidéo Ceased WO2007111069A1 (fr)

Applications Claiming Priority (2)

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JP2006-085608 2006-03-27
JP2006085608 2006-03-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9338389B2 (en) 2011-10-20 2016-05-10 Dolby Laboratories Licensing Corporation Method and system for video equalization
JP2016181744A (ja) * 2015-03-23 2016-10-13 日本電信電話株式会社 動画像埋め込み装置、方法、及びプログラム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000078467A (ja) * 1998-06-18 2000-03-14 Sony Corp 画像合成方法
JP2002354372A (ja) * 2001-05-25 2002-12-06 Sony Corp 表示制御装置および方法、記録媒体、並びにプログラム
JP2004289742A (ja) * 2003-03-25 2004-10-14 Yamaha Corp 映像加工パラメータ設定装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000078467A (ja) * 1998-06-18 2000-03-14 Sony Corp 画像合成方法
JP2002354372A (ja) * 2001-05-25 2002-12-06 Sony Corp 表示制御装置および方法、記録媒体、並びにプログラム
JP2004289742A (ja) * 2003-03-25 2004-10-14 Yamaha Corp 映像加工パラメータ設定装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9338389B2 (en) 2011-10-20 2016-05-10 Dolby Laboratories Licensing Corporation Method and system for video equalization
US9667910B2 (en) 2011-10-20 2017-05-30 Dolby Laboratories Licensing Corporation Method and system for video equalization
JP2016181744A (ja) * 2015-03-23 2016-10-13 日本電信電話株式会社 動画像埋め込み装置、方法、及びプログラム

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