WO2013128549A1 - Circuit d'ajustement de saturation des couleurs et son procédé de commande - Google Patents

Circuit d'ajustement de saturation des couleurs et son procédé de commande Download PDF

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Publication number
WO2013128549A1
WO2013128549A1 PCT/JP2012/054780 JP2012054780W WO2013128549A1 WO 2013128549 A1 WO2013128549 A1 WO 2013128549A1 JP 2012054780 W JP2012054780 W JP 2012054780W WO 2013128549 A1 WO2013128549 A1 WO 2013128549A1
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Prior art keywords
color
saturation
correction
red
green
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PCT/JP2012/054780
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English (en)
Japanese (ja)
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健 森本
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Ｎｅｃディスプレイソリューションズ株式会社
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Priority to PCT/JP2012/054780 priority Critical patent/WO2013128549A1/fr
Publication of WO2013128549A1 publication Critical patent/WO2013128549A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours

Definitions

  • the present invention relates to a saturation adjustment circuit that performs spot color correction and a control method thereof.
  • the saturation adjustment circuit disclosed in Patent Document 1 when the saturation is increased by spot color correction using red as a special color, the video signal is corrected so as to increase the red data value, and the red data value is corrected.
  • the saturation is increased by increasing the difference between the color value and the data value of other colors.
  • the red data value in the original video signal is high and the lightness is high, the upper limit value is reached even if the red data value is increased, and the color saturation state is reached and saturation adjustment can be performed. It may not be possible.
  • An object of the present invention is to provide a saturation adjustment circuit capable of performing saturation adjustment even when the brightness of a video signal is high, and a control method therefor.
  • a calculation unit When a reference color, which is a reference color among red, green, and blue, is determined according to the specific color, and the fact that the saturation is increased by the special color correction is input, according to the increase amount of the saturation Calculating a correction amount for reducing the data value of the color other than the reference color among red, green, and blue, multiplying the calculated correction amount by the spot color degree calculated by the spot color degree calculating unit, A correction calculator to output; And an adder that adds the output of the correction calculator to the data value indicated in the video signal for each of the red, green, and blue color components.
  • the saturation adjustment circuit performs spot color correction that adjusts the saturation of a video signal in a certain range of hues centered on a spot color that is a specific color specified in advance.
  • the saturation adjustment circuit of this embodiment performs spot color correction for six colors of red, green, blue, cyan, magenta, and yellow.
  • the video signal RGBin which is a signal in the RGB color space, is input from the external video signal to the HSV calculation unit 101, the special color calculation unit 102, and the addition unit 114.
  • the calculated special color degree ⁇ Cc is output to the cyan correction calculation unit 106, the calculated special color degree ⁇ Mc is output to the magenta correction calculation unit 107, and the calculated special color degree ⁇ Yc is output to the yellow correction calculation unit 108.
  • the red correction calculation unit 103 generates correction signals dRr, dRg, dRb indicating correction values of the data values Rin, Gin, Bin by the special color correction for red according to the saturation adjustment coefficient Rcnt and the special color degree ⁇ Rc, The result is output to the adding unit 109.
  • the blue correction calculation unit 105 generates correction signals dBr, dBg, and dBb indicating correction values of the data values Rin, Gin, and Bin by the special color correction for blue according to the saturation adjustment coefficient Bcnt and the special color degree ⁇ Bc. The result is output to the adding unit 110.
  • the cyan correction calculation unit 106 generates correction signals dCr, dCg, dCb indicating correction values of data values Rin, Gin, Bin by special color correction for cyan according to the saturation adjustment coefficient Ccnt and the special color degree ⁇ Cc. The result is output to the adding unit 111.
  • the yellow correction calculation unit 108 generates correction signals dYr, dYg, dYb indicating correction values of the data values Rin, Gin, Bin by the special color correction for yellow according to the saturation adjustment coefficient Ycnt and the special color degree ⁇ Yc, The result is output to the adding unit 113.
  • the adder 109 adds the correction signals dRr, dRg, dRb input from the red correction calculator 103 and the correction signals dGr, dGg, dGb input from the green correction calculator 104 for each of the red, green, and blue color components. Addition and output to the adder 110.
  • the adder 113 adds the input from the adder 112 and the correction signals dYr, dYg, dYb input from the yellow correction calculator 108 for each color component, and data values Rin, Gin, Signals AddR, AddG, and AddB obtained by adding the bin correction values are output to the adder 114.
  • the adder 114 adds the correction values indicated by the signals AddR, AddG, and AddB input from the adder 113 to the data values Rin, Gin, and Bin, and outputs the data values of red, green, and blue to the limiter 115. .
  • the limiter 115 performs a process of clipping so that the red, green, and blue data values input from the adding unit 114 exceed the upper limit value, and the input value is input from the adding unit 114.
  • the data values of red, green, and blue are negative, a process of setting to 0 is performed, and the corrected video signal RGBout is output to the outside of the saturation adjustment circuit 100.
  • red, green, and blue data values are each represented by 8 bits. Therefore, the red, green, and blue data values each take a value in the range of 0 to 255.
  • the saturation adjustment coefficient takes a value in the range of 0 to 2.0, is colorless when it is 0, and doubles the saturation when it is 2.0. Is a value indicating.
  • the HSV calculation unit 101 converts the data values Rin, Gin, Bin taking values in the range of 0 to 255 into values in the range of 0 to 1.0 in order to calculate the hue H, saturation S, and brightness V. To do.
  • data values Rin, Gin, Bin converted to values in the range of 0 to 1.0 are expressed as data values R, G, B, respectively.
  • the HSV calculation unit 101 calculates the hue H using the following equation (1).
  • a and B ′ are values determined based on the data values Rin, Gin, and Bin, as shown in FIG.
  • Max () is a function for obtaining the maximum value
  • Min () is a function for obtaining the minimum value.
  • FIG. 3 shows the relationship between the identification (T) and hue shown in FIG.
  • the HSV calculation unit 101 calculates the saturation S using the following equation (2).
  • the HSV calculation unit 101 calculates the lightness V using the following equation (3).
  • pos (x) is a function that is x when x is positive, and 0 otherwise.
  • Hc1 represents the center hue for spot color correction.
  • FIG. 4 is a diagram showing the relationship between the central hue Hc1 and the corrected hue range m1.
  • the color within the range of angles from Hc1 ⁇ m1 / 2 to Hc1 + m1 / 2 with the central hue Hc1 as the center is the range where the special color correction with the central hue Hc1 as the special color extends.
  • FIG. 5 is a diagram showing the relationship between the hue H and the special color degree ⁇ 1 when the saturation is S and the brightness is V.
  • FIG. 5 is a diagram showing the relationship between the hue H and the special color degree ⁇ 1 when the saturation is S and the brightness is V.
  • the special color degree ⁇ 1 has a maximum value of S ⁇ V, and as the hue H moves away from Hc, the special color degree ⁇ 1 decreases linearly.
  • FIG. 6 is a diagram illustrating the characteristic degree ⁇ Rc for red.
  • the special color degree ⁇ Rc is 1.0, and it can be seen that the special color degree ⁇ Rc approaches 0 as it moves to another color.
  • the special color degree calculation unit 102 calculates the special color degrees ⁇ Rc, ⁇ Gc, ⁇ Bc, ⁇ Cc, ⁇ Mc, ⁇ Yc using the equation (4).
  • FIG. 7 shows values to be substituted for Hc1 in the equation (4) when calculating the special color degrees ⁇ Rc, ⁇ Gc, ⁇ Bc, ⁇ Cc, ⁇ Mc, ⁇ Yc.
  • specific equations for calculating each of the special color degrees ⁇ Rc, ⁇ Gc, ⁇ Bc, ⁇ Cc, ⁇ Mc, ⁇ Yc are shown.
  • the special color degree calculation unit 102 calculates the special color degrees ⁇ Rc, ⁇ Gc, ⁇ Bc, ⁇ Cc, ⁇ Mc, ⁇ Yc using the above formulas (5) to (11).
  • the red correction calculation unit 103 determines red as a reference color in order to perform a special color correction for red, and according to the saturation adjustment coefficient Rcnt, the data value of the reference color and other than the reference color among red, green, and blue Increase or decrease the difference from the color data value.
  • FIG. 8 is a diagram illustrating an example of an example of levels of data values Rin, Gin, and Bin indicated in the video signal RGBin.
  • the saturation adjustment coefficient Rcnt indicates that the saturation should be 0 by the spot color correction for red, as shown in FIG. .
  • the green and blue data values are raised to the same level as the red data values. That is, when the saturation adjustment coefficient Rcnt indicates that the saturation is decreased, the red correction calculation unit 103 decreases the difference between the data value of the reference color and the data value of the color other than the reference color. . By doing so, it is possible to reduce the saturation as is apparent from the equation (2).
  • the red correction calculation unit 103 indicates that the saturation adjustment coefficient Rcnt increases the saturation
  • the red data value can be increased, as shown in FIG. Increase the red data value and decrease the green and blue data values. That is, the red correction calculation unit 103 increases the difference between the data value of the reference color and the data value of the color other than the reference color when the saturation adjustment coefficient Rcnt indicates that the saturation is increased. .
  • This makes it possible to increase the saturation as is clear from the equation (2), and not simply to increase the data value of the reference color, so that the data value Rin is high and the lightness is high. In addition, it is possible to prevent saturation and adjust the saturation.
  • the red correction calculation unit 103 calculates the color differences iRmR, iRmG, iRmB based on red using the following formulas (12) to (14).
  • the red correction calculation unit 103 calculates iGRmG and iGRmB using the following equations (15) and (16).
  • the red correction calculation unit 103 increases the red data value when the saturation adjustment coefficient Rcnt indicates that the saturation is increased, and the saturation adjustment coefficient Rcnt increases the saturation. In the case of indicating to decrease, the red data value is left as it is. Therefore, the red correction calculation unit 103 calculates iGRmR using the following equation (17).
  • Equation (15) to Equation (17) may include a fractional part. In this case, the decimal part may be discarded.
  • the green correction calculation unit 104 reduces the difference between the data value of the reference color and the data value of the color other than the reference color when the saturation adjustment coefficient Gcnt indicates that the saturation is decreased. . By doing so, it is possible to reduce the saturation as is apparent from the equation (2).
  • the green correction calculation unit 104 increases the green data value if the green data value can be increased. Reduce the red and blue data values. That is, when the saturation adjustment coefficient Gcnt indicates that the saturation is increased, the green correction calculation unit 104 increases the difference between the data value of the reference color and the data value of the color other than the reference color. . This makes it possible to increase the saturation as is apparent from the equation (2), and not simply to increase the data value of the reference color, so that the data value Gin is high and the lightness is high. In addition, it is possible to prevent saturation and adjust the saturation.
  • the green correction calculation unit 104 calculates iGGmR and iGBmB using the following equations (24) and (25).
  • the green correction calculation unit 104 increases the green data value when the saturation adjustment coefficient Gcnt indicates that the green saturation is increased, and the saturation adjustment coefficient Gcnt If it indicates that the degree is to be decreased, the green data value is left as it is. Therefore, the green correction calculation unit 104 calculates iGGmG using the following equation (26).
  • the calculation result of Expression (24) to Expression (26) may include a fractional part. In this case, the decimal part may be discarded.
  • the green correction calculation unit 104 generates correction signals dGr, dGg, and dGb using the following equations (27) to (29).
  • the correction strength can be given by multiplying by the special color degree ⁇ Gc.
  • the blue correction calculation unit 105 determines blue as a reference color in order to perform a special color correction for blue, and according to the saturation adjustment coefficient Bcnt, the data value of the reference color and a color other than the reference color among red, green, and blue Increase or decrease the difference from the color data value.
  • the saturation adjustment coefficient Bcnt indicates that the saturation is reduced by the special color correction for blue
  • the blue data value is left as it is, and the red and green values are corrected.
  • Increase the data value that is, when the saturation adjustment coefficient Bcnt indicates that the saturation is decreased, the blue correction calculation unit 105 decreases the difference between the data value of the reference color and the data value of the color other than the reference color. . By doing so, it is possible to reduce the saturation as is apparent from the equation (2).
  • the blue correction calculation unit 105 increases the blue data value if the blue data value can be increased. Reduce the red and green data values. That is, when the saturation adjustment coefficient Bcnt indicates that the saturation is increased, the blue correction calculation unit 105 increases the difference between the data value of the reference color and the data value of the color other than the reference color. . This makes it possible to increase the saturation as is apparent from the equation (2), and not simply to increase the data value of the reference color, so that the data value Bin is high and the lightness is high. In addition, it is possible to prevent saturation and adjust the saturation.
  • the blue correction calculation unit 105 calculates iGBmR and iGBmG using the following equations (33) and (34).
  • the blue correction calculation unit 105 increases the blue data value when the saturation adjustment coefficient Bcnt indicates that the saturation of blue is increased, and the saturation adjustment coefficient Bcnt is increased by the saturation adjustment coefficient Bcnt. If it indicates that the degree is to be decreased, the blue data value is left as it is. Therefore, the blue correction calculation unit 105 calculates iGBmB using the following equation (35).
  • the calculation result of Expression (33) to Expression (35) may include a fractional part. In this case, the decimal part may be discarded.
  • cyan correction calculation unit 106 determines blue and green as reference colors in order to perform special color correction for cyan, and determines the reference color according to the saturation adjustment coefficient Ccnt. Increase or decrease the difference between the data value and the data value of a color other than the reference color among red, green, and blue.
  • the saturation adjustment coefficient Ccnt indicates that the saturation is reduced by the special color correction for cyan, among the blue and green determined as the reference color
  • the level of the data value of the other color and red determined as the reference color is matched with the data value of one color. That is, when the saturation adjustment coefficient Ccnt indicates that the saturation is decreased, the cyan correction calculation unit 106 decreases the difference between the data value of the reference color and the data value of the color other than the reference color. . By doing so, it is possible to reduce the saturation as is apparent from the equation (2).
  • the cyan correction calculation unit 106 determines that the blue and green data can be increased if the blue and green data values can be increased. Increase the value and decrease the red data value. That is, when the saturation adjustment coefficient Ccnt indicates that the saturation is increased, the cyan correction calculation unit 106 increases the difference between the data value of the reference color and the data value of the color other than the reference color. . This makes it possible to increase the saturation as is apparent from the equation (2), and not simply to increase the data value of the reference color, so that the data value Bin is high and the lightness is high. In addition, it is possible to prevent saturation and adjust the saturation.
  • the cyan correction calculation unit 106 calculates the color differences iCmR, iCmG, iCmB, iCBmG based on cyan using the following equations (39) to (42).
  • the color difference iCBmG is calculated so that the level of the green data value matches the level of the blue data value when the saturation is reduced by the special color correction for cyan.
  • the cyan correction calculation unit 106 calculates iGCmR, iGCmG, iGCmB, and iGCBmG using the following equations (43) to (46).
  • the calculation result of Expression (43) to Expression (46) may include a fractional part. In this case, the decimal part may be discarded.
  • the cyan correction calculation unit 106 generates correction signals dCr, dCg, and dCb using the following equations (47) to (49).
  • the correction strength can be given by multiplying by the special color degree ⁇ Cc.
  • the saturation adjustment coefficient Ccnt indicates that the saturation is to be decreased
  • the example has been described in which the green and red data values are combined with the blue data value, but the present invention is not limited to this.
  • the blue data value may be matched with the green data value.
  • magenta correction calculation unit 107 determines red and blue as reference colors in order to perform a special color correction for magenta, and determines the reference color according to the saturation adjustment coefficient Mcnt. Increase or decrease the difference between the data value and the data value of a color other than the reference color among red, green, and blue.
  • the magenta correction calculation unit 107 when the saturation adjustment coefficient Mcnt indicates that the saturation is reduced by the special color correction for magenta, of red and blue determined as the reference color, The level of the data value of the other color and green determined as the reference color is matched with the data value of one color. That is, the magenta correction calculation unit 107 reduces the difference between the data value of the reference color and the data value of the color other than the reference color when the saturation adjustment coefficient Mcnt indicates that the saturation is decreased. . By doing so, it is possible to reduce the saturation as is apparent from the equation (2).
  • the magenta correction calculation unit 107 determines that the red and blue data values can be increased if the red and blue data values can be increased. Increase the value and decrease the green data value. That is, the magenta correction calculation unit 107 increases the difference between the data value of the reference color and the data value of the color other than the reference color when the saturation adjustment coefficient Mcnt indicates that the saturation is increased. . This makes it possible to increase the saturation as is clear from the equation (2), and not simply to increase the data value of the reference color, so that the data value Rin is high and the lightness is high. In addition, it is possible to prevent saturation and adjust the saturation.
  • magenta correction calculation unit 107 will be described in more detail.
  • description will be given using an example in which blue and green data values are combined with red data values when the saturation adjustment coefficient Mcnt indicates that saturation is to be reduced.
  • the magenta correction calculation unit 107 calculates the color differences iMmR, iMmG, iMmB, and iMRmB with respect to magenta using the following formulas (50) to (53).
  • the color difference iMRmB is calculated so that the blue data value matches the level of the red data value when the saturation is reduced by the special color correction for magenta.
  • the magenta correction calculation unit 107 calculates iGMmR, iGMmG, iGMmB, and iGMRmB using the following equations (54) to (57).
  • Equation (54) to Equation (57) may include a fractional part. In this case, the decimal part may be discarded.
  • the addition unit 113 adds all the red components, the signal AddR, all the green components AddD, and all the blue components of the correction signals output from the red correction calculation unit 103 to the yellow correction calculation unit 108.
  • the signal AddB is output to the adder 114.
  • the addition unit 114 adds the correction values indicated by the signals AddR, AddG, and AddB to the data values Rin, Gin, and Bin, respectively, and outputs the result to the limiter 115.
  • the red, green, and blue data values are represented by 8 bits and take values in the range of 0 to 255.
  • the saturation adjustment circuit 100 determines the reference color from red, green, and blue according to the spot color for which the spot color correction is performed, and the saturation adjustment coefficient increases the saturation. In the case of indicating the video signal, the video signal is corrected so as to lower the data value of the color other than the reference color.
  • Decreasing the data value of the color other than the reference color and increasing the difference between the data value of the reference color and the data value of the color other than the reference color can increase the saturation without increasing the data value of the reference color. Therefore, saturation adjustment can be performed even when the brightness of the original video signal is high.

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Abstract

La présente invention concerne un circuit d'ajustement de saturation des couleurs qui réalise une correction des couleurs sélective qui ajuste la saturation des couleurs d'un signal vidéo ayant une plage fixe de teintes centrées sur une couleur spécifique, le circuit d'ajustement de saturation des couleurs ayant : une unité de calcul de niveau de couleur spécifique pour calculer un niveau de couleur spécifique indiquant un degré de similarité entre une couleur indiquée par le signal vidéo et la couleur spécifique, lorsqu'un signal vidéo indiquant une valeur de données pour chacune des couleurs parmi le rouge, le vert et le bleu est entré, et pour délivrer le résultat de ce calcul ; une unité de calcul de correction pour déterminer, conformément à la couleur spécifique, une couleur de référence, qui est la couleur parmi le rouge, le vert et le bleu qui sera la référence, et lorsqu'une instruction ordonnant l'effet d'augmentation de la saturation des couleurs par une correction des couleurs sélective est entrée, pour calculer la quantité de correction pour rendre minimales les valeurs de données de couleurs autres que la couleur de référence parmi le rouge, le vert et le bleu conformément à la quantité d'augmentation de la saturation des couleurs, multiplier le niveau de couleur spécifique calculé par l'unité de calcul de niveau de couleur spécifique par la quantité de correction calculée, et délivrer le résultat de cette multiplication ; et un dispositif d'addition pour additionner le résultat de l'unité de calcul de correction à la valeur de données indiquée dans le signal vidéo pour chacune des composantes chromatiques rouge, verte et bleue, et délivrer le résultat de cette opération.
PCT/JP2012/054780 2012-02-27 2012-02-27 Circuit d'ajustement de saturation des couleurs et son procédé de commande WO2013128549A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10198795A (ja) * 1996-11-18 1998-07-31 Nec Corp 画像の色補正装置及び色補正プログラムを記録した記録媒体
JP2004356930A (ja) * 2003-05-29 2004-12-16 Matsushita Electric Ind Co Ltd 色彩調整装置及びその方法
WO2006059573A1 (fr) * 2004-12-02 2006-06-08 Matsushita Electric Industrial Co., Ltd. Dispositif de réglage de couleur et procédé
JP2007036415A (ja) * 2005-07-25 2007-02-08 Brother Ind Ltd 画像処理装置、画像処理プログラムおよび画像処理方法
JP2007243666A (ja) * 2006-03-09 2007-09-20 Nec Electronics Corp 色補正装置、色補正方法及びプログラム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10198795A (ja) * 1996-11-18 1998-07-31 Nec Corp 画像の色補正装置及び色補正プログラムを記録した記録媒体
JP2004356930A (ja) * 2003-05-29 2004-12-16 Matsushita Electric Ind Co Ltd 色彩調整装置及びその方法
WO2006059573A1 (fr) * 2004-12-02 2006-06-08 Matsushita Electric Industrial Co., Ltd. Dispositif de réglage de couleur et procédé
JP2007036415A (ja) * 2005-07-25 2007-02-08 Brother Ind Ltd 画像処理装置、画像処理プログラムおよび画像処理方法
JP2007243666A (ja) * 2006-03-09 2007-09-20 Nec Electronics Corp 色補正装置、色補正方法及びプログラム

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