JP2005102238A - Apparatus and method for adjusting hue and color saturation, and image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of adjusting hue and color saturation for an RGB input signal. <P>SOLUTION: This apparatus comprises a converting means for converting the RGB signal into hue/color saturation, an adjusting means for adjusting the converted hue/color saturation into a desired value, and a reverse-converting mean for reversely converting the adjusted hue/color saturation into RGB. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a hue and saturation adjustment technique, and more particularly to a hue / saturation conversion technique when RGB signals are input.

With the development of multimedia technology, anyone can handle video information relatively easily, such as editing a VTR using a personal computer. Video sources are diversified, and various video sources such as DVDs, VTRs, satellite broadcasts, and personal computers are displayed on a display device such as a television or personal computer monitor. The barrier of displaying on a monitor is disappearing.
By the way, as for transmission of video signals, luminance and color signals (or color difference signals) are generally used for television images mainly including natural images, and RGB signals are generally used for personal computer output. Color adjustment is mainly performed in hue and saturation adjustment based on color signals in a television receiver, and individual RGB color adjustment is mainly performed in a personal computer monitor.

In recent personal computers, not only characters and graphics but also natural image display has become commonplace. When displaying natural images, there is a demand for adjusting the hue and saturation as if they were television.
On the other hand, for example, Adobe's image retouching software “PhotoShop” has a color adjustment mode, and can select RGB adjustment and adjustment of luminance, hue, and color difference, and perform data conversion on the target image file. Is going.

  However, in the above known example, the above-mentioned software itself is necessary for the hue adjustment, and there is a problem that it is difficult to adjust the hue for various display images in general.

  An object of the present invention is to provide a technique capable of adjusting hue and saturation with respect to RGB signal input.

The present invention has been made in order to achieve the above object, and a conversion unit that converts RGB signals into hue / saturation on a display device, an adjustment unit that adjusts the hue / saturation after conversion to a desired value, Inverse conversion means for inversely converting the adjusted hue / saturation to RGB is provided.
Thereby, it is possible to adjust the hue even when the RGB signal is input. Also, by converting input / output of the converted hue using a LUT (Look Up Table), it is possible to convert an arbitrary hue to a desired hue, or to convert the saturation of an arbitrary hue to a desired saturation. A richly expressive video display seasoned according to preference can be realized.

  In order to achieve the object of the present invention, in the first invention, the hue and saturation adjusting device includes a signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal representing a hue, A hue adjustment circuit that adjusts the hue of the hue signal; a saturation conversion circuit that converts the primary color signal into a signal representing saturation; and a saturation adjustment circuit that adjusts the saturation signal.

In the second invention, the hue and saturation adjusting device converts a signal source that outputs a primary color signal, a luminance signal conversion circuit that converts the primary color signal into a luminance signal, and a signal that represents the hue. A hue conversion circuit; a hue adjustment circuit that adjusts the hue of the hue signal; a saturation conversion circuit that converts the primary color signal into a signal representing saturation; a saturation adjustment circuit that adjusts the saturation signal; A primary color signal conversion circuit for converting the luminance signal, the adjusted hue signal, and the adjusted saturation signal into a primary color signal.
In the second aspect, a level adjustment circuit for adjusting the level of the primary color signal converted by the primary color signal conversion circuit is provided. Also, a switching control circuit is provided, and an area in which one screen is adjusted by the hue adjusting circuit and the saturation signal adjusting circuit and an area in which the level adjusting circuit is adjusted are switched by the switching control circuit.

In a third aspect, the hue adjustment device includes a signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal representing a hue, and a hue detection circuit that detects a specific hue of the hue signal; And a hue conversion circuit for converting a specific hue detected by the hue detection circuit into another hue.
In the third invention, an image position designation signal generation circuit is provided, and a hue designated by the image position designation signal is converted into an arbitrary hue by the hue conversion circuit.

  In the fourth invention, the adjusting device again converts a signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal representing hue, and converts the primary color signal into a signal representing saturation. A saturation conversion circuit; a hue detection circuit that detects a specific hue of the hue signal; a saturation detection circuit that detects the saturation signal; and a saturation corresponding to the specific hue detected by the saturation detection circuit And a saturation conversion circuit for converting the color to other saturation. In a fourth aspect of the present invention, an image position designation signal generation circuit is provided, and the saturation at the position designated by the image position designation signal is arbitrarily converted by the saturation conversion circuit.

  In the fifth invention, the hue and saturation adjusting device includes a signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal that represents a hue, and a signal that represents saturation. A saturation conversion circuit that converts the hue signal into a hue detection circuit that detects a specific hue of the hue signal, a saturation detection circuit that detects saturation in the specific hue, and a specific hue detected by the hue detection circuit A hue conversion circuit for converting the color saturation into another hue, and a saturation conversion circuit for converting the saturation detected by the saturation detection circuit into another saturation.

  In a fifth aspect, the hue conversion circuit includes a lookup table, and the saturation conversion circuit includes a lookup table.

  In a sixth aspect of the invention, the hue and saturation adjustment method includes the steps of converting the primary color signal into a signal representing hue, adjusting the hue of the hue signal, and converting the primary color signal into a signal representing saturation. Converting, and adjusting the saturation signal.

  In the seventh invention, the hue and saturation adjustment method includes the steps of converting the primary color signal into a luminance signal, converting the primary color signal into a signal representing the hue, and adjusting the hue of the hue signal. Converting the primary color signal into a signal representing saturation; adjusting the saturation signal; converting the luminance signal, the adjusted hue signal, and the adjusted saturation signal into a primary color signal; Converting.

  In an eighth aspect of the invention, the hue and saturation adjusting method includes the steps of converting the primary color signal into a signal representing a hue, detecting a specific hue of the hue signal, and specifying the color detected in the hue detection step. Converting the hue of the color to another hue.

  In a ninth aspect, the saturation adjustment method includes the steps of converting the primary color signal into a signal representing hue, converting the primary color signal into a signal representing saturation, and detecting a specific hue of the hue signal. And a step of detecting the saturation signal, and a step of converting the saturation corresponding to the specific hue detected in the saturation detection step into another saturation.

  In a tenth aspect of the invention, the hue and saturation adjusting method includes the steps of converting the primary color signal into a signal representing hue, converting the primary color signal into a signal representing saturation, and specifying the hue signal. Detecting the hue, detecting the saturation in the specific hue, converting the specific hue detected in the hue detection step to another hue, and detecting in the saturation detection step Converting the saturation to another saturation.

  In an eleventh aspect of the present invention, in an image display device that receives RGB signals, hue conversion means for converting the RGB signals into hues, saturation conversion means for converting RGB signals into saturation signals, and the hue are adjusted. Hue adjustment means, saturation adjustment means for adjusting the saturation signal, RGB conversion means for inversely converting the adjusted hue and saturation signal into RGB signals, and RGB level adjustment means.

  In an twelfth aspect of the present invention, in an image display apparatus that receives RGB signals, hue conversion means for converting RGB signals into hues, saturation conversion means for converting RGB signals into saturation signals, and hues for adjusting the hues An adjustment unit; a saturation adjustment unit that adjusts the saturation signal; an RGB conversion unit that reversely converts the adjusted hue and saturation signal into an RGB signal; and an RGB level adjustment unit; For each specific display area, hue adjustment is performed using any one of the hue adjustment unit, the saturation adjustment unit, and the RGB level adjustment unit.

  In an eleventh or twelfth aspect of the present invention, the apparatus includes a luminance conversion unit that converts the RGB signal into a luminance signal, and a luminance level adjustment unit that adjusts the level of the luminance signal.

According to a thirteenth aspect of the present invention, in an image display device that receives RGB signals, hue conversion means for converting the RGB signals into hues, saturation conversion means for converting the RGB signals into saturation signals, and the hue signals. A hue detecting means for detecting a specific hue; a hue converting means for converting the hue signal into an arbitrary hue; and an RGB converting means for inversely converting the converted hue signal and saturation signal into an RGB signal. The hue is arbitrarily converted with respect to the hue detected by the detecting means.
In a thirteenth aspect, adjustment position specifying means for specifying an adjustment position on the display screen is provided, and the hue is arbitrarily converted by the hue conversion means for the hue at the position specified by the adjustment position specifying means. Further, the hue conversion means includes a lookup table.

In a fourteenth aspect of the present invention, in an image display device that receives an RGB signal, a hue conversion unit that converts the RGB signal into a hue, a saturation conversion unit that converts the RGB signal into a saturation signal, and the hue signal Hue detection means for detecting a specific hue, saturation conversion means for converting the saturation in the specific hue into an arbitrary saturation, and RGB conversion for inversely converting the hue signal and the converted saturation signal into an RGB signal And the chroma is arbitrarily converted by the chroma conversion means for the hue detected by the hue detection means.
In a fourteenth aspect of the invention, there is provided adjustment position designating means for designating an adjustment position on the display screen, and the hue at the position designated by the adjustment position designating means is arbitrarily converted by the color saturation conversion means. To do. The saturation conversion means includes a look-up table.

According to the present invention, it is possible to adjust the hue even when RGB signals are input.

Hereinafter, embodiments of the present invention will be described with reference to the drawings using some examples. FIG. 1 is a block diagram showing a first embodiment of a liquid crystal display device according to the present invention. In the figure, 1 is a signal source, 2 is a matrix circuit that converts a primary color signal (RGB signal) into a luminance signal Y and a color difference signal (BY signal, RY signal), 3 is a hue detection circuit, and 4 is saturation. Detection circuits 5, 5 and 6 are multiplication circuits, 7 and 8 are addition circuits, 9 to 12 are registers, 13 is a color difference reproduction circuit, 14 and 15 are multiplication circuits, and 16 is a luminance signal Y and a color difference signal converted into primary color signals. A matrix circuit, 17 to 19 are multiplication circuits, 20 to 22 are addition circuits, 23 to 28 are registers, and 29 is a display device. The registers 9 to 12 are constituted by a RAM or the like, and the values of the registers 9 to 12 are rewritten according to a command from the microcomputer.

  A configuration example of each block in FIG. 1 will be described below. The matrix circuit 2 can be realized, for example, with the configuration of FIG. FIG. 2 is a block diagram showing an embodiment of a matrix circuit for inputting a color signal and outputting a luminance signal and a color difference signal. In the figure, 30 to 33 are multipliers, 34 to 37 are adders, and 38 to 41 are coefficient multipliers. The RGB signals applied to the terminals 42 to 44 are multiplied by coefficients output from the coefficient units 38 to 40 by multipliers 30 to 32, respectively. The R signal and G signal multiplied by these coefficients are added by an adder 34, and the output of the adder 34 and the B signal are added by an adder 35, whereby a luminance signal Y is generated. The R-Y signal is obtained by adding the R signal applied to the terminal 42 to the negative luminance signal -Y obtained by multiplying the multiplier 33 by the coefficient -1 output from the coefficient unit 41 by the adder 36. Generated. The BY signal can be generated by adding the minus luminance signal -Y, which is the output of the multiplier 33, to the B signal applied to the terminal 44.

  The matrix circuit 16 can be realized, for example, with the configuration shown in FIG. FIG. 3 is a block diagram showing an embodiment of a matrix circuit that inputs luminance and color difference signals and outputs color signals. In the figure, 45 to 47 are multipliers, 48 to 51 are adders, and 52 to 54 are coefficient multipliers. The Y signal, the RY signal, and the BY signal applied to the terminals 55 to 57 are respectively multiplied by the coefficients output from the coefficient units 52 to 54 by the multipliers 45 to 47, respectively. The luminance signal Y applied to the terminal 55 by the adder 48 and the RY signal applied to the terminal 56 are added, and the output of the adder 48 and the BY signal are added by the adder 49, whereby G A signal is generated. The adder 50 adds the luminance signal Y to the RY signal applied to the terminal 56 to generate an R signal, and the adder 51 adds the luminance signal Y to the BY signal applied to the terminal 57. By doing so, a B signal is generated.

The hue detection circuit 3 can be realized, for example, with a configuration as shown in FIG.
FIG. 4 is a block diagram showing an embodiment of the hue detection circuit. In the figure, reference numeral 60 is a division circuit, and 61 is a circuit for obtaining an inverse trigonometric function of tan (hereinafter referred to as an ATRAN circuit). Each of the division circuit 60 and the ATRAN circuit 61 can be easily realized by a table reference method using a LUT (Look Up Table) (not shown).

  On the other hand, the saturation detection circuit 4 can be realized, for example, with a configuration as shown in FIG. FIG. 5 is a block diagram showing an embodiment of the saturation detection circuit. In the figure, reference numerals 62 and 63 denote multiplication circuits, and reference numeral 64 denotes a square root circuit (hereinafter referred to as a ROOT circuit). The multiplier circuit 62 squares the RY signal, and the multiplier circuit 63 squares the BY signal. Saturation is obtained by supplying the outputs of the multiplication circuits 62 and 63 to the square root circuit 64 and taking the square root of the sum thereof.

  The multiplication circuits 62 and 63 and the ROOT circuit 64 can be easily realized by a table reference method using an LUT (not shown).

  FIG. 6 shows the relationship between the BY signal, the RY signal, hue, and saturation. FIG. 6 is a characteristic diagram for explaining the relationship between hue and saturation. The horizontal axis (x axis) represents the level of the BY signal, and the vertical axis (y axis) represents the level of the RY signal. . The vector sum of the BY signal and the RY signal is a vector representing hue and saturation, the angle θ is the hue, and the magnitude S is the saturation. That is, the hue θ can be obtained from the equation 1, and the saturation S can be obtained from the equation 2.

  FIG. 7 is a characteristic diagram showing the hue and normalized level of the color difference signal. The color difference reproduction circuit 13 can also be realized by, for example, an LUT, and its input / output characteristics are trigonometric functions as shown in FIG. FIG. 7 shows the angle θ on the horizontal axis and the normalized value R of the level on the vertical axis. The BY signal is a Cos function with respect to the input θ and is shown by a curve 65, and the RY signal is a Sin function and is shown by a curve 66.

  Next, the operation of FIG. 1 will be described. The RGB signal output from the signal source 1 is converted into a Y signal, a BY signal, and an RY signal by the matrix circuit 2, and the BY signal and the RY signal are a hue detection circuit 3 and a saturation detection circuit 4. And converted into hue θ and saturation S. The hue θ is added to the value of the register 11 by the adding circuit 7 to obtain a hue θ ′, and the hue is changed by the value of the register 11. The saturation S is multiplied by the value of the register 10 by the multiplication circuit 6 to become the saturation S ′, and the saturation is changed by the value of the register 6. Note that the values of the registers 10 and 11 are changed according to a command from a microcomputer (not shown) according to the instruction of the viewer.

  The changed hue θ ′ is input to the color difference reproduction circuit 13, the value of the Cos function corresponding to θ ′ is output as a BY signal, and the value of the Sin function corresponding to θ ′ is output as an RY signal. The output is multiplied by the saturation S ′ that has been varied by the multiplication circuits 14 and 15. The BY output and RY output of the color difference reproduction circuit 13 are normalized values, and the true B to be reproduced is determined by determining the magnitude of the BY signal and the RY signal by the saturation S ′. -Y signal and RY signal are generated. On the other hand, the luminance signal Y is input to the matrix circuit 16 after the amplitude is adjusted by the register 9 in the multiplier circuit 5 and the direct current level is adjusted by the register 12 in the adder circuit 8.

  The matrix circuit 16 generates RGB signals from the luminance signal Y and the color difference signals BY and RY. In the subsequent stage of the matrix circuit 16, the multiplier circuits 17 to 19 and the adder circuits 20 to 22 are made variable by the registers 23 to 28 so that the amplitude and the direct current level can be adjusted for each of the RGB signals. A circuit provided between the matrix circuit 16 and the display device 29 is usually provided in a signal circuit that inputs RGB, and in this circuit, when the hue and saturation are adjusted, the luminance changes. However, by converting the RGB signal into a luminance signal and a color difference signal, the hue and saturation can be changed with almost no change in luminance.

  In the above configuration, the primary color signal can be converted into the hue signal by the matrix circuit 2 and the hue detection circuit 3. The primary color signal can be converted into a saturation signal by the matrix circuit 2 and the saturation detection circuit 4. The signal processed as described above is input to the display device 29 and displayed. Any display device may be used as long as it has an RGB input such as a cathode ray tube display device, a liquid crystal display device, or a plasma display device.

  As described above, according to the configuration of the present embodiment, the hues and saturations can be adjusted by the registers 11 and 10 and the luminance can be adjusted by the registers 9 and 12 with respect to the same input from the signal source 1, and the RGB can be adjusted by the registers 23 to 28. Amplitude and DC level can be adjusted separately.

  When a personal computer is connected as the signal source 1, for example, the display content includes not only characters and graphics but also still images and moving images of natural images. In the case of only characters and graphics, it is possible to achieve a desired color tone only by adjusting each of RGB as in the past, but in the case of a natural image, it is difficult to achieve a desired color tone by independent adjustment of RGB. In natural image display, you have to rely on the adjustment of hue and saturation to make the skin color a little pink.

  According to this configuration, it is possible to select whether to adjust the hue and saturation by adjusting the registers 9 to 12 or to adjust the RGB by adjusting the registers 23 to 28 according to the user's request. Adjustment becomes very convenient.

  Hereinafter, a second embodiment of the image display device according to the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing a second embodiment of the image display apparatus according to the present invention. In FIG. 8, the RGB signal source 1 from the personal computer described in the first embodiment and the signal source 71 of the luminance signal, RY signal, and BY signal are switched by a switching circuit (hereinafter referred to as SEL) 70. I am trying to do it. Blocks having the same functions as those in FIG. The signal source 71 has an output signal format having luminance Y and color difference signals BY and RY, such as DVD player output, satellite broadcast set-top box output, or digital camera output. Note that the color difference signals BY and RY are shown separately, but depending on the signal source, the color difference signals BY and RY may be time-division multiplexed, and not necessarily the BY signal. The wiring of the RY signal is not separated.

  The feature of this embodiment is that either the signal source 1 having RGB output such as a personal computer or the signal source 71 having luminance and color difference can be freely selected according to the user's request from hue / saturation adjustment or RGB individual adjustment. In addition, it is possible to eliminate the inconvenience of only the hue and saturation adjustment for television images and the RGB adjustment for personal computer signals as in the prior art. Since the signal processing and operation after SEL 70 have been described in the first embodiment, they are omitted here.

Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 9 is a block diagram showing a third embodiment of the image display apparatus according to the present invention. 9 is provided with switching means 72 to 79 in the block diagram of FIG. 1, and the switching control circuit 80 controls the switching means 72 to 79 so that the respective adjustment values are switched over time. The same blocks as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. The switching control in FIG. 9 is performed when screen B is inserted into screen A as shown in FIG.

  FIG. 10 is a front view of the display when another screen is fitted on the screen. FIG. 11 is a front view of the display when two screens are fitted on the screen. In FIG. 10, RGB adjustment is performed in the area of screen A, and hue and saturation adjustment (referred to as YSH adjustment) is performed in the area of screen B. On a personal computer screen, natural images are often displayed with characters and graphics inserted, and with this configuration, character graphics can be adjusted with RGB and natural images can be adjusted with YSH.

  The switching means 72 to 79 in FIG. 9 switch the selection target to either a register value or a fixed value of “1” or “0”, respectively. For example, when a signal “1” is output from the switching control circuit 80, the switching means 72 and 73 are respectively tilted (connected) to the fixed value side, and the adder circuit 7 sets “0” to the output of the hue detection circuit 3. The multiplication circuit 6 multiplies the output of the saturation detection circuit 4 by “1”. That is, neither hue nor saturation is variable.

On the other hand, since the output "1" of the switching control circuit 80 is inverted to "0" by the inverter 81, the switching means 74 to 79 are connected to the registers 23 to 25, respectively. Are multiplied by the values of the registers 23 to 25, and the respective amplitudes are varied. In the adder circuits 20 to 22, the values of the registers 26 to 28 are added to the respective RGB, and the respective DC levels are varied.
That is, according to the output timing of the switching control circuit 80, the hue and saturation adjustment can be switched between RGB adjustment and YSH adjustment. The switching control timing of the switching control circuit 80 may be an instruction from the signal source 101, for example. Since the signal source 101 has the position information of the B area fitted as shown in FIG. 10, the switching operation of the switching control circuit 80 is performed based on the position information. For example, the switching control circuit 80 may be configured to generate a timing pulse by a counter circuit (not shown) based on address information received from the signal source 101.

  As described above, the YSH adjustment or the RGB adjustment for adjusting the hue and saturation can be properly used for the embedded image region. In FIG. 10, hue and saturation adjustment is performed only for the B area, but it is a feature of the present invention that the B area can be adjusted for RGB and the A area can be adjusted for hue and saturation according to the user's request.

  Furthermore, even when the number of embedded images increases as shown in FIG. 11, the present invention is effective, and separate hue and saturation adjustments are possible in the B area and C area of FIG. For this purpose, the addresses of the registers 10 and 11 may be switched by the switching control circuit 80 in accordance with the timings of the display areas B and C.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 12 is a block diagram showing a fourth embodiment of the image display apparatus according to the present invention. The feature of this embodiment is that the output of the hue detection circuit 3 is input / output converted by the hue LUT 90 to convert it to an arbitrary hue, and the output of the hue detection circuit 3 is input / output converted by the saturation LUT 91 to change the color of a specific hue The degree is that the degree can be arbitrarily changed. Since other circuit operations are the same as those in FIG.

  FIG. 13 shows an example of input / output characteristics of the hue LUT and the saturation LUT. FIG. 13A is a characteristic diagram of the hue LUT showing a specific setting of hue, and FIG. 13B is a characteristic diagram of the LUT showing a specific setting of saturation. In FIG. 13A, the vertical axis represents the hue θ expressed by an angle, and the horizontal axis represents a digital value D indicating the hue. FIG. 13B shows the hue θ on the horizontal axis and the normalized value R on the vertical axis. As shown in FIG. 13A, in the hue LUT, the peripheral hue is slightly shifted around the specific hue. Further, as shown in FIG. 13B, in the saturation LUT, the saturation is emphasized by making the saturation larger than 1 time in a specific hue.

  In order to convey the adjustment image in an easy-to-understand manner, a specific adjustment example is shown using the hue diagram of FIG. FIG. 14 is a characteristic diagram showing the conversion of hue and saturation, with the horizontal axis indicating the BY level and the vertical axis indicating the RY level. In FIG. 14, the saturation is increased in the red direction within the range of the hue 83. This is achieved by setting the saturation coefficient near the red phase in the saturation LUT to be larger than 1. Next, the hue 84 near the skin color is set to a hue 84a obtained by slightly rotating the hue in the red direction to further increase the saturation. This is to make the skin color look healthy. In this case, as shown in FIG. 13A, the saturation coefficient is slightly emphasized in the vicinity of the skin color phase in the saturation LUT, while the phase is slightly decreased in the vicinity of the skin color phase in the hue LUT. Then, in the hue 85 near blue, such as sky blue, the saturation of blue is emphasized by the saturation LUT. Sky blue is said to have a better impression as people look more saturated than the original color.

  As described above, the hue and saturation of the desired hue can be arbitrarily converted, and the range of seasoning with respect to the display image can be widened to realize rich image expression. In addition, even when it is difficult to reproduce the color difference due to the color of the projection light source such as a liquid crystal projector, the present invention can easily realize a hue that is difficult to display on the liquid crystal projector, and can greatly improve the display image quality. It is.

  FIG. 15 is a block diagram showing a fifth embodiment of the image display apparatus according to the present invention. FIG. 15 shows an embodiment in which the embodiment of FIG. 8 in which the signal source 1 and the signal source 71 are switched by the SEL 70 and the embodiment of FIG. 12 using the hue LUT 90 and the saturation LUT 91 are combined. Also, arbitrary hue and arbitrary saturation conversion are possible. As described above, according to the present invention, it is possible to adjust the color tone even when RGB signals are input. Also, by converting input / output of the hue after conversion with the LUT, it is possible to convert an arbitrary hue to a desired hue, or to convert the saturation of an arbitrary hue to a desired hue. A rich and expressive video display can be realized. In addition, there is a great effect in improving the color reproducibility of a liquid crystal projector or the like.

It is a block diagram which shows the 1st Example of the liquid crystal display device by this invention. It is a block diagram showing an embodiment of a matrix circuit that inputs a color signal and outputs a luminance signal and a color difference signal. It is a block diagram which shows one Example of the matrix circuit which inputs a brightness | luminance and a color difference signal, and outputs a color signal. It is a block diagram which shows one Example of a hue detection circuit. It is a block diagram which shows one Example of a detection circuit again. It is a characteristic view for demonstrating the relationship between hue and saturation. FIG. 6 is a characteristic diagram illustrating hues and normalized levels of color difference signals. It is a block diagram which shows the 2nd Example of the image display apparatus by this invention. It is a block diagram which shows the 3rd Example of the image display apparatus by this invention. It is a front view of a display display at the time of fitting other screens on the screen. It is a front view of a display display at the time of fitting two screens on the screen. It is a block diagram which shows the 4th Example of the image display apparatus by this invention. FIG. 6 is a characteristic diagram of a hue LUT indicating a specific setting of hue and an LUT indicating a specific setting of saturation. It is a characteristic view which shows conversion of hue and saturation. It is a block diagram which shows the 5th Example of the image display apparatus by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Signal source, 2, 16 ... Matrix circuit, 3 ... Hue detection circuit, 4 ... Saturation detection circuit, 13 ... Color difference reproduction circuit, 60 ... Division circuit, 61 ... Inverse trigonometric function circuit, 64 ... Square root circuit, 80 ... Switching control circuit, 90 ... hue LUT, 91 ... saturation LUT.

Claims (24)

  A signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal that represents a hue, a hue adjustment circuit that adjusts the hue of the hue signal, and a signal that represents the saturation. A hue and saturation adjustment device comprising: a saturation conversion circuit that adjusts the saturation signal; and a saturation adjustment circuit that adjusts the saturation signal.   A signal source that outputs a primary color signal, a luminance signal conversion circuit that converts the primary color signal into a luminance signal, a hue conversion circuit that converts the primary color signal into a signal representing a hue, and a hue that adjusts the hue of the hue signal An adjustment circuit, a saturation conversion circuit for converting the primary color signal into a signal representing saturation, a saturation adjustment circuit for adjusting the saturation signal, the luminance signal, the adjusted hue signal, and the adjusted A hue and saturation adjusting apparatus comprising a primary color signal conversion circuit that converts a saturation signal into a primary color signal.   3. The hue and saturation adjustment circuit according to claim 2, further comprising a level adjustment circuit for adjusting a level of the primary color signal converted by the primary color signal conversion circuit.   4. The hue and saturation adjustment circuit according to claim 3, wherein a switching control circuit is provided, and an area in which one screen is adjusted by the hue adjustment circuit and the saturation signal adjustment circuit, and an area in which the level adjustment circuit is adjusted are defined by the switching control circuit. Hue and saturation adjusting device characterized by switching at the same time.   A signal source that outputs a primary color signal; a hue conversion circuit that converts the primary color signal into a signal representing a hue; a hue detection circuit that detects a specific hue of the hue signal; and a specific detection detected by the hue detection circuit A hue adjustment device comprising: a hue conversion circuit that converts a hue into another hue.   6. The hue adjustment circuit according to claim 5, wherein an image position designation signal generation circuit is provided, and the hue designated by the image position designation signal is converted into an arbitrary hue by the hue conversion circuit.   A signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal representing hue, a saturation conversion circuit that converts the primary color signal into a signal representing saturation, and specification of the hue signal A hue detection circuit for detecting a hue, a saturation detection circuit for detecting the saturation signal, and a saturation conversion for converting the saturation corresponding to the specific hue detected by the saturation detection circuit into another saturation And a saturation adjusting device.   8. The saturation adjusting circuit according to claim 7, wherein an image position designation signal generation circuit is provided, and the saturation at the position designated by the image position designation signal is arbitrarily converted by the saturation conversion circuit. Saturation adjustment device as a feature.   A signal source that outputs a primary color signal, a hue conversion circuit that converts the primary color signal into a signal representing hue, a saturation conversion circuit that converts the primary color signal into a signal representing saturation, and specification of the hue signal A hue detection circuit that detects a hue of the specific hue, a saturation detection circuit that detects saturation in the specific hue, a hue conversion circuit that converts the specific hue detected by the hue detection circuit to another hue, and the saturation A hue and saturation adjusting device comprising: a saturation conversion circuit that converts the saturation detected by the saturation detection circuit into another saturation.   The hue and saturation adjusting apparatus according to claim 9, wherein the hue conversion circuit includes a lookup table, and the saturation conversion circuit includes a lookup table.   Converting the primary color signal into a signal representing hue; adjusting the hue of the hue signal; converting the primary color signal into a signal representing saturation; and adjusting the saturation signal. A method for adjusting hue and saturation.   Converting the primary color signal into a luminance signal; converting the primary color signal into a signal representing a hue; adjusting a hue of the hue signal; and converting the primary color signal into a signal representing saturation. Adjusting the saturation signal; and converting the luminance signal, the adjusted hue signal, and the adjusted saturation signal into a primary color signal. Degree adjustment method.   Converting the primary color signal into a signal representing a hue, detecting a specific hue of the hue signal, and converting the specific hue detected in the hue detection step into another hue. The hue adjustment method characterized by this.   Converting the primary color signal into a signal representing hue; converting the primary color signal into a signal representing saturation; detecting a specific hue of the hue signal; and detecting the saturation signal. And a step of converting the saturation corresponding to the specific hue detected in the saturation detection step into another saturation.   Converting the primary color signal into a signal representing hue; converting the primary color signal into a signal representing saturation; detecting a specific hue of the hue signal; and saturation in the specific hue. A step of detecting, a step of converting the specific hue detected in the hue detection step into another hue, and a step of converting the saturation detected in the saturation detection step into another saturation. Hue and saturation adjustment method characterized by the above.   In an image display device that receives an RGB signal, a hue conversion unit that converts the RGB signal into a hue, a saturation conversion unit that converts the RGB signal into a saturation signal, a hue adjustment unit that adjusts the hue, An image display apparatus comprising: saturation adjusting means for adjusting a saturation signal; RGB conversion means for inversely converting the adjusted hue and saturation signal into RGB signals; and RGB level adjusting means.   In an image display device that receives an RGB signal, a hue conversion unit that converts the RGB signal into a hue, a saturation conversion unit that converts the RGB signal into a saturation signal, a hue adjustment unit that adjusts the hue, and the saturation Saturation adjustment means for adjusting the degree signal, RGB conversion means for inversely converting the adjusted hue and saturation signal into RGB signals, and RGB level adjustment means, and for each specific display area of the image display device, An image display apparatus comprising: adjusting hue using any one of the hue adjusting unit, the saturation adjusting unit, and the RGB level adjusting unit.   18. The image display device according to claim 16, further comprising a luminance conversion unit that converts the RGB signal into a luminance signal and a luminance level adjustment unit that adjusts a level of the luminance signal.   In an image display device that receives an RGB signal, a hue conversion unit that converts the RGB signal into a hue, a saturation conversion unit that converts the RGB signal into a saturation signal, and a hue that detects a specific hue from the hue signal A detection unit; a hue conversion unit that converts the hue signal into an arbitrary hue; and an RGB conversion unit that reversely converts the converted hue signal and saturation signal into an RGB signal, and is detected by the hue detection unit An image display device characterized by arbitrarily converting a hue with respect to a hue.   20. The image display device according to claim 19, further comprising adjustment position designation means for designating an adjustment position on a display screen, wherein the hue conversion means arbitrarily sets a hue with respect to a hue at a position designated by the adjustment position designation means. An image display device characterized by converting.   20. The image display device according to claim 19, wherein the hue conversion means includes a lookup table.   In an image display device that receives an RGB signal, a hue conversion unit that converts the RGB signal into a hue, a saturation conversion unit that converts the RGB signal into a saturation signal, and a hue that detects a specific hue from the hue signal Detection means; saturation conversion means for converting the saturation in the specific hue into an arbitrary saturation; and RGB conversion means for inversely converting the hue signal and the converted saturation signal into an RGB signal, An image display device, wherein the saturation is arbitrarily converted by the saturation conversion means with respect to the hue detected by the hue detection means.   23. The image display device according to claim 22, further comprising adjustment position designation means for designating an adjustment position on a display screen, and the color saturation conversion means for the hue at the position designated by the adjustment position designation means. An image display device characterized by arbitrarily converting. 23. The image display device according to claim 22, wherein the saturation conversion means includes a lookup table.

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