CN101527857A - Display device, and color conversion method and color conversion circuit of same - Google Patents

Abstract

The invention discloses a color conversion method of a display device, which comprises the following steps: inputting an image input signal into the display device; converting the image input signal into a coordinate value positioned in a color space; selecting at least one from a plurality of mathematic models according to the coordinate value of the color space and the coordinate position of the color space; and calculating an image output signal according to the at least one of the mathematic models and a comparison table. The invention also discloses the display device and a color conversion circuit thereof.

Description

Display unit and color conversion method thereof and color conversion circuit

Technical field

The invention relates to a kind of display unit and color conversion method thereof and color conversion circuit.

Background technology

Along with Display Technique is constantly weeded out the old and bring forth the new, at present, the display unit on market is to comprise plasma display (PDP), cathode ray tube (CRT) display, Organic Light Emitting Diode (OLED) display and LCD (LCD) etc.

With the LCD is example, in its manufacture process, can be because factors such as processing procedure and materials, and cause the drift problem of form and aspect (hue).Therefore, if the user inputs to two LCD with same signal of video signal,, can make that then above-mentioned two colors that LCD presented are not necessarily identical because each LCD has different form and aspect.

For addressing the above problem, prior art be the corresponding data of form and aspect correction that will handle well write as the table of comparisons (Look-up Table, LUT), and by table look-up and the mode of interpolation method to adjust the form and aspect of each LCD.Yet when the user required the display frame accuracy of LCD, the data quantity of interpolation method was huge, and arithmetic logic quantity is many, made cost raising and wafer volume become big.

In addition, another prior art is to be matrix method.Matrix method is that its matrix relationship formula is as follows by the corresponding relation of matrix with description image input signal and output image signal:

$\left[\begin{array}{c}{R}^{,}\\ G^{,}\\ B^{,}\end{array}\right]=\left[\begin{array}{ccc}r1& g1& b1\\ r2& g2& b2\\ r3& g3& b3\end{array}\right]\left[\begin{array}{c}R\\ G\\ B\end{array}\right],$

Wherein RGB is a parameter of representing image input signal respectively, and R ' G ' B ' is the parameter of expression output image signal.R1～r3, g1～g3 and b1～b3 are adjustable parameter, and it is to set according to the characteristic of each LCD.Yet in actual applications, the included parameter of above-mentioned matrix still can't complete description image input signal and the corresponding relation of output image signal, so that the accuracy deficiency of matrix method, and causes display frame to produce situations such as the discontinuous and color spot of distribution of color.

Therefore, how under the situation of the identical signal of video signal of input, and make each LCD present identical color, real one of the current important topic that belongs to.

Summary of the invention

Because above-mentioned problem, purpose of the present invention is for providing a kind of easy realization circuit design, and do not increase cost to adjust display unit and the color conversion method and the color conversion circuit of form and aspect.

For achieving the above object, the present invention provides a kind of method of color conversion, and it comprises the following steps: an image input signal is converted to a coordinate values that is positioned at a color gamut space.According to the coordinate values of color gamut space, and cooperate its residing coordinate position to select at least one of them in a plurality of Mathematical Modelings.And by one of them and the comparison list at least of these Mathematical Modelings, to calculate an output image signal.Mathematical Modeling is respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein Be output image signal,

Be image input signal,

$\left(2\right){,R}_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein

Be output image signal,

Be image input signal,

$\left(3\right){,R}_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(4\right),R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(5\right){,R}_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

Be output image signal,

Be image input signal,

$\left(6\right){,R}_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein Be output image signal,

Be image input signal, LUT (S) is the side-play amount of image input signal in color gamut space.

For achieving the above object, the present invention also provides a kind of color conversion circuit, and it comprises a color converting unit, a memory cell and a signal processing unit.Wherein color conversion cell is converted to an image input signal coordinate values that is positioned at a color gamut space.Corresponding a plurality of Mathematical Modelings of cell stores and color gamut space and comparison list.Signal processing unit is coupled to color conversion cell and memory cell respectively, and according to image input signal, these Mathematical Modelings and the table of comparisons, to produce an output image signal.These Mathematical Modelings are respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(2\right),R_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein

Be output image signal,

Be image input signal,

$\left(3\right){,R}_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein Be output image signal,

Be image input signal,

$\left(4\right),R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal, Be image input signal,

$\left(5\right),R_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

Be output image signal,

Be image input signal,

$\left(6\right),R_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal, Be image input signal, LUT (S) is the side-play amount of image input signal in color gamut space.

For achieving the above object, the present invention provides a kind of color conversion method of display unit again, and it comprises the following steps: an image input signal is inputed to a display unit.Image input signal is converted to a coordinate values that is positioned at a color gamut space.According to coordinate values, and cooperate its residing coordinate position with select in a plurality of Mathematical Modelings at least wherein one.And by at least wherein one and the comparison list of these Mathematical Modelings, to calculate an output image signal.Mathematical Modeling is to be respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(2\right),R_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein Be output image signal,

Be image input signal,

$\left(3\right),R_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(4\right),R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(5\right),R_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

Be output image signal,

Be image input signal,

$\left(6\right),R_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal, LUT (S) is the side-play amount of image input signal in color gamut space.

For achieving the above object, the present invention provides a kind of display unit again, and it comprises a display floater, a module backlight and a control circuit board.Module backlight and display floater are oppositely arranged, and provide a light source to display floater.Control circuit board is coupled to display floater, and control circuit board comprises a color change-over circuit, and control circuit board receives an image input signal, and according to image input signal, a plurality of Mathematical Modeling and comparison list, to produce an output image signal.These Mathematical Modelings are respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(2\right),R_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein Be output image signal,

Be image input signal,

$\left(3\right),R_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(4\right),R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal,

$\left(5\right),R_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

Be output image signal,

Be image input signal,

$\left(6\right),R_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein

Be output image signal,

Be image input signal, LUT (S) is the side-play amount of image input signal in color gamut space.

From the above, because of according to display unit of the present invention and color conversion method and color conversion circuit, describe the relation of image input signal and color gamut space and cooperate look-up table by Mathematical Modeling, with the form and aspect of adjustment display unit.Therefore, the present invention can revise the color distortion that each display unit causes because of hue shift by less arithmetic logic, and can control cost effectively.

Description of drawings

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 is a schematic diagram of the display unit of demonstration preferred embodiment of the present invention;

Fig. 2 is a schematic diagram of the color conversion method of the display unit of demonstration preferred embodiment of the present invention; And

Fig. 3 is a schematic diagram of the color gamut space of demonstration preferred embodiment of the present invention; And

Fig. 4 is a schematic diagram of the comparison list of the display unit of demonstration preferred embodiment of the present invention.

The main element symbol description:

1: display unit

11: display floater

12: module backlight

13: control circuit board

131: color conversion circuit

132: color conversion cell

133: signal processing unit

134: memory cell

L1: light source

S1: image input signal

S2: output image signal

S11～S14: the step of color conversion method

H _R, H _Y, H _G, H _C, H _B, H _M: axle

I, II, III, IV, V, VI: zone

Embodiment

Hereinafter with reference to relevant drawings, display unit and color conversion method and color conversion circuit according to preferred embodiment of the present invention are described.

As shown in Figure 1, the display unit 1 according to preferred embodiment of the present invention comprises a display floater 11, one module 12 backlight and a control circuit board 13.Module 12 backlight is oppositely arranged with display floater 11, and provides a light source L1 to display floater 11.Control circuit board 13 is coupled to display floater 11.In the present embodiment, display floater 11 is to be a display panels, and display unit is to be a liquid crystal indicator.

In addition, control circuit board 13 receives an image input signal S1, and according to image input signal S1, a plurality of Mathematical Modeling and comparison list, and produce an output image signal S2.As shown in Figure 1, control circuit board 13 is to comprise a color change-over circuit 131.Wherein, color conversion circuit 131 comprises a color converting unit 132, a signal processing unit 133 and a memory cell 134.Wherein signal processing unit 133 is coupled to color conversion cell 132 and memory cell 134 respectively.

In addition, color conversion cell 132 is converted to a coordinate values that is positioned at a color gamut space with image input signal S1, and is sent to signal processing unit 133.Memory cell 134 stores and corresponding a plurality of Mathematical Modelings of this color gamut space and comparison list.Wherein the table of comparisons is for storing the corresponding relation of image input signal S1 and color gamut space.

Please refer to shown in Figure 2ly, the color conversion method of display unit of the present invention also can be referred to as the programmable form and aspect and adjust algorithm (programmable hue modification algorithm, PHMA), it comprises that step S11 is to step S14.

Step S11 is that image input signal S1 is inputed to display unit.Step S12 is that image input signal S1 is converted to the coordinate values that is positioned at color gamut space.

Please be simultaneously with reference to shown in Figure 3, color gamut space is a HSV color attribute pattern, and wherein H (hue) is the expression form and aspect, and S (saturation) is the expression saturation, and V (value) is expression brightness.

In the present embodiment, because of not considering the variation of brightness, equal a HS plane of 0 at V so Figure 3 shows that HSV color attribute pattern.In the present embodiment, the HS plane is to divide into a first area I, a second area II, one the 3rd area I II, one the 4th area I V, one the 5th regional V and one the 6th regional VI.Yet the present invention and non-limiting HS plane only can be divided into six zones, know this skill person, when can the HS plane being divided into required regional number according to its demand.

In addition, first area I and the 6th regional VI adjacent have a H _RAxle, wherein R is red (red) pixel of expression.At H _ROn the axle, the relational expression of R pixel, G (green) pixel and B (blueness) pixel is as follows:

H _R：R＞G＝B。

In H _RMathematical Modeling on the axle is as follows:

$R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein

For image input signal S1 at H _RComponent on the axle,

For output image signal S2 at H _RComponent on the axle, LUT (S) are the side-play amount of image input signal S1 in color gamut space.

First area I and second area II adjacent have a H _YAxle, wherein Y is represented as yellow (yellow) pixel.At H _YOn the axle, the relational expression of R pixel, G pixel and B pixel is as follows:

H _Y：G＝R＞B。

In H _YMathematical Modeling on the axle is as follows:

$R_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein

For image input signal S1 at H _YComponent on the axle, For output image signal S2 at H _YComponent on the axle.

Second area II and the 3rd area I II adjacent have a H _GAxle.At H _GOn the axle, the relational expression of R pixel, G pixel and B pixel is as follows:

H _G：G＞R＝B。

In H _GMathematical Modeling on the axle is as follows:

$R_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein

For image input signal S1 at H _GComponent on the axle,

For output image signal S2 at H _GComponent on the axle.

The 3rd area I II and the 4th area I V adjacent have a H _CAxle, wherein C is represented as cyan (cyan) pixel.At H _COn the axle, the relational expression of R pixel, G pixel and B pixel is as follows:

H _C：B＝G＞R。

In H _CMathematical Modeling on the axle is as follows:

$R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

For image input signal S1 at H _CComponent on the axle, For output image signal S2 at H _CComponent on the axle.

The 4th area I V and the 5th regional V adjacent have a H _BAxle.At H _BOn the axle, the relational expression of R pixel, G pixel and B pixel is as follows:

H _B：B＞R＝G。

In H _CMathematical Modeling on the axle is as follows:

$R_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

For image input signal S1 at H _BComponent on the axle,

For output image signal S2 at H _BComponent on the axle.

The 5th regional V and the 6th regional VI adjacent have a H _MAxle, wherein M is represented as purple (magenta) pixel.At H _MOn the axle, the relational expression of R pixel, G pixel and B pixel is as follows:

H _M：R＝B＞G。

In H _MMathematical Modeling on the axle is as follows:

$R_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein

For image input signal S1 at H _MComponent on the axle,

For output image signal S2 at H _MComponent on the axle.

Please continue with reference to Fig. 2 and shown in Figure 3, from the above, more accurate on calculating for making image frame, in this, the Mathematical Modeling of present embodiment also comprises coherent numerical value of the same colour, a chroma parameter value and a luminance parameter value.Therefore, above-mentioned Mathematical Modeling is after describing by form and aspect parameter value, chroma parameter value and luminance parameter value, and its Mathematical Modeling can be respectively:

In H _RMathematical Modeling on the axle is as follows:

$R_{H_R^{\′}}^{\′}=\mathrm{Max}+d{L}_{H_R},$

$G_{H_R^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×d{H}_{H_R}-d{C}_{H_R}+d{L}_{H_R},$

$B_{H_R^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×d{H}_{H_R}-d{C}_{H_R}+d{L}_{H_R},$

Wherein, $\mathrm{Max}=\max \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right),$ $\mathrm{Min}=\min \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right),$ μ ₁And μ ₂Be a constant,

Be the form and aspect parameter value, Be the chroma parameter value,

Be the luminance parameter value.

In H _YMathematical Modeling on the axle is as follows:

$R_{H_Y^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×d{H}_{H_Y}+d{L}_{H_Y},$

$G_{H_Y^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×d{H}_{H_Y}+d{L}_{H_Y},$

$B_{H_Y^{\′}}^{\′}=\mathrm{Min}-d{C}_{H_Y}+d{L}_{H_Y},$

Wherein

Be the form and aspect parameter value,

Be the chroma parameter value,

Be the luminance parameter value.

In H _GMathematical Modeling on the axle is as follows:

$R_{H_G^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×d{H}_{H_G}-d{C}_{H_G}+d{L}_{H_G},$

$G_{H_G^{\′}}^{\′}=\mathrm{Max}+d{L}_{H_G},$

$B_{H_G^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×d{H}_{H_G}-d{C}_{H_G}+d{L}_{H_G},$

Wherein

Be the form and aspect parameter value,

Be the chroma parameter value,

Be the luminance parameter value.

In H _CMathematical Modeling on the axle is as follows:

$R_{H_C^{\′}}^{\′}=\mathrm{Min}-d{C}_{H_C}+d{L}_{H_C},$

$G_{H_C^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×d{H}_{H_C}+d{L}_{H_C},$

$B_{H_C^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×d{H}_{H_C}+d{L}_{H_C},$

Wherein

Be the form and aspect parameter value,

Be the chroma parameter value,

Be the luminance parameter value.

In H _BMathematical Modeling on the axle is as follows:

$R_{H_B^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×d{H}_{H_B}-d{C}_{H_B}+d{L}_{H_B},$

$G_{H_B^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×d{H}_{H_B}-d{C}_{H_B}+d{L}_{H_B},$

$B_{H_B^{\′}}^{\′}=\mathrm{Max}+d{L}_{H_B},$

Wherein

Be the form and aspect parameter value,

Be the chroma parameter value,

Be the luminance parameter value.

In H _MMathematical Modeling on the axle is as follows:

$R_{H_M^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×d{H}_{H_M}+d{L}_{H_M},$

$G_{H_M^{\′}}^{\′}=\mathrm{Min}-d{C}_{H_M}+d{L}_{H_M},$

$B_{H_M^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×d{H}_{H_M}+d{L}_{H_M},$

Wherein

Be the form and aspect parameter value,

Be the chroma parameter value,

Be the luminance parameter value.

In addition, H _RAxle, H _YAxle, H _GAxle, H _CAxle, H _BAxle and H _MAxle has a joining, and the color of joining is a white.

Please refer to shown in Figure 2ly, step S13 selects Mathematical Modeling.In the present embodiment, the HS plane system comprises first area I to the six regional VI.Image input signal S1 is converted to the coordinate values that is positioned at color gamut space, according to the zone that coordinate values is positioned at, the Mathematical Modeling of selecting the diaxon adjacent with this zone at least one of them.For example, input signal S1 (192,128,96) is converted to the coordinate values that is positioned at color gamut space,, then selects H because this coordinate values is positioned at first area I _RAxle or H _YThe axle Mathematical Modeling at least one of them.

Step S14 is by one of above-mentioned Mathematical Modeling and comparison list, to calculate an output image signal S2.Wherein the table of comparisons is for storing the corresponding relation of image input signal S1 and color gamut space.

When input signal S1 is (192,128,96), then according to H _RAxle or H _YThe Mathematical Modeling of axle at least one of them, can push away to such an extent that the Mathematical Modeling of output image signal S2 of present embodiment is:

$S2=\left\{\begin{array}{c}{\mathrm{Max}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_s+w\×g\×(-a\×g\×{\mathrm{dH}}_e+d{L}_e-d{L}_s)\\ {\mathrm{Med}}^{\′}=\mathrm{Med}+b\×g\×d{H}_s-{\mathrm{dC}}_s+{\mathrm{dL}}_s+w\×g\×(-c\×g\×{\mathrm{dH}}_e-b\×g\×{\mathrm{dH}}_s+d{C}_s+d{L}_e-d{L}_s)\\ {\mathrm{Min}}^{\′}=\mathrm{Min}+d\×g\×d{H}_s-d{C}_s+{\mathrm{dL}}_s+w\×g\×(-d\×g\×{\mathrm{dH}}_s+{\mathrm{dC}}_s-d{C}_e+d{L}_e-d{L}_s)\end{array}\right.$

Wherein, $w=\left(\frac{\mathrm{Med}-\mathrm{Min}}{\mathrm{Max}-\mathrm{Min}}\right),$ A, b, c, d and g are respectively a constant.

Please image input signal S1 be converted to the coordinate values that is positioned at color gamut space simultaneously with reference to shown in Figure 4, when coordinate values is positioned at first area I,

(dLs，dCs，dHs)＝LUT(1)，

(dLe，dCe，dHe)＝LUT(2)。

When coordinate values is positioned at second area II,

(dLs，dCs，dHs)＝LUT(3)，

(dLe，dCe，dHe)＝LUT(2)。

When coordinate values is positioned at the 3rd area I II,

(dLs，dCs，dHs)＝LUT(3)，

(dLe，dCe，dHe)＝LUT(4)。

When coordinate values is positioned at the 4th area I V,

(dLs，dCs，dHs)＝LUT(5)，

(dLe，dCe，dHe)＝LUT(4)。

When coordinate values is positioned at the 5th regional V,

(dLs，dCs，dHs)＝LUT(5)，

(dLe，dCe，dHe)＝LUT(6)。

When coordinate values is positioned at the 6th regional VI,

(dLs，dCs，dHs)＝LUT(1)，

(dLe，dCe，dHe)＝LUT(6)。

Because input signal S1 (192,128,96) is converted to the coordinate values that is positioned at color gamut space, is to be positioned at first area I, therefore,

(dLs，dCs，dHs)＝LUT(1)＝(12，28，-20)，

(dLe，dCe，dHe)＝LUT(2)＝(8，68，-4)。

In addition, $\mathrm{Max}=\max \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right)=192$ And $\mathrm{Min}=\min \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right)=96,$ And hypothesis a=b=0 and c=d=g=1.Be to get output image signal S2 and be (203,121,52) the Mathematical Modeling of above-mentioned parameter value substitution output image signal S2.

In addition, each display unit has different characteristics, makes different display unit have different corresponding relations.

In sum, because of according to display unit of the present invention and color conversion method and color conversion circuit, describe the relation of image input signal and color gamut space and cooperate look-up table by Mathematical Modeling, with the form and aspect of adjustment display unit.Therefore, the present invention can revise the color distortion that each display unit causes because of hue shift by less amount of memory, and can control cost effectively.

The above only is an illustrative, but not is restricted.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the appending claims its equivalent modifications of carrying out or change.

Claims (10)

1, a kind of method of color conversion comprises:

One image input signal is converted to a coordinate values that is positioned at a color gamut space;

According to this coordinate values, and cooperate its residing coordinate position to select at least one of them in a plurality of Mathematical Modelings; And

By described Mathematical Modeling one of them and comparison list, to calculate an output image signal, described Mathematical Modeling is respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal,

$\left(2\right),R_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein Be this output image signal,

Be this image input signal,

$\left(3\right),R_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal, Be this image input signal,

$\left(4\right),R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal,

$\left(5\right),R_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

Be this output image signal, Be this image input signal,

$\left(6\right),R_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal, LUT (S) is the side-play amount of this image input signal in this color gamut space.

2, the method for color conversion as claimed in claim 1 is characterized in that, this color gamut space is a HSV color attribute pattern.

3, the method for color conversion as claimed in claim 2, it is characterized in that, this color gamut space equals on 0 the plane at V be to be a HS plane, and this HS plane is to divide into a first area, a second area, one the 3rd zone, one the 4th zone, one the 5th zone and one the 6th zone.

4, the method for color conversion as claimed in claim 1 is characterized in that, described Mathematical Modeling is to comprise coherent numerical value of the same colour, a chroma parameter value and a luminance parameter value.

5, the method for color conversion as claimed in claim 4 is characterized in that, described Mathematical Modeling is to be respectively:

$\left(1\right){,R}_{H_R^{\′}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_{H_R},$

$G_{H_R^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_R}-{\mathrm{dC}}_{H_R}+{\mathrm{dL}}_{H_R},$

$B_{H_R^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_R}-{\mathrm{dC}}_{H_R}+{\mathrm{dL}}_{H_R},$

Wherein $\mathrm{Max}=\max \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right),$ $\mathrm{Min}=\min \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right),$ μ ₁And μ ₂Be a constant,

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(2\right){,R}_{H_Y^{\′}}^{\′}=\mathrm{Max}-{{\mathrm{\μ}}_1\×\mathrm{dH}}_{H_Y}+{\mathrm{dL}}_{H_Y},$

$G_{H_Y^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_Y}+{\mathrm{dL}}_{H_Y},$

$B_{H_Y^{\′}}^{\′}=\mathrm{Min}-{\mathrm{dC}}_{H_Y}+{\mathrm{dL}}_{H_Y},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(3\right){,R}_{H_G^{\′}}^{\′}=\mathrm{Min}+{{\mathrm{\μ}}_2\×\mathrm{dH}}_{H_G}-{\mathrm{dC}}_{H_G}+{\mathrm{dL}}_{H_G},$

$G_{H_G^{\′}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_{H_G},$

$B_{H_G^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_G}-{\mathrm{dC}}_{H_G}+{\mathrm{dL}}_{H_G},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(4\right){,R}_{H_C^{\′}}^{\′}=\mathrm{Min}-{\mathrm{dC}}_{H_C}+{\mathrm{dL}}_{H_C},$

$G_{H_C^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_C}+{\mathrm{dL}}_{H_C},$

$B_{H_C^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_C}+{\mathrm{dL}}_{H_C},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(5\right),R_{H_B^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_B}-d{C}_{H_B}+d{C}_{H_B},$

$G_{H_B^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_B}-d{C}_{H_B}+{\mathrm{dL}}_{H_B},$

$B_{H_B^{\′}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_{H_B},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value, Be this luminance parameter value,

$\left(6\right){,R}_{H_M^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_M}+{\mathrm{dL}}_{H_M},$

$G_{H_M^{\′}}^{\′}=\mathrm{Min}-d{C}_{H_M}+{\mathrm{dL}}_{H_M},$

$B_{H_M^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_M}+{\mathrm{dL}}_{H_M},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value.

6, a kind of color conversion circuit comprises:

One color converting unit is converted to an image input signal coordinate values that is positioned at a color gamut space;

One memory cell stores and corresponding a plurality of Mathematical Modelings of this color gamut space and comparison list; And

One signal processing unit is coupled to this color conversion cell and this memory cell respectively, and according to this image input signal, described Mathematical Modeling and this table of comparisons, to produce an output image signal, described Mathematical Modeling is to be respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=R_{H_R},$

$G_{H_R^{\′}}^{\′}=G_{H_R}+\mathrm{LUT}\left(S\right),$

$B_{H_R^{\′}}^{\′}=B_{H_R}-\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal,

$\left(2\right),R_{H_Y^{\′}}^{\′}=R_{H_Y}-\mathrm{LUT}\left(S\right),$

$G_{H_Y^{\′}}^{\′}=G_{H_Y}+\mathrm{LUT}\left(S\right),$

$B_{H_Y^{\′}}^{\′}=B_{H_Y},$

Wherein

Be this output image signal,

Be this image input signal,

$\left(3\right),R_{H_G^{\′}}^{\′}=R_{H_G}-\mathrm{LUT}\left(S\right),$

$G_{H_G^{\′}}^{\′}=G_{H_G},$

$B_{H_G^{\′}}^{\′}=B_{H_G}+\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal,

$\left(4\right),R_{H_C^{\′}}^{\′}=R_{H_C},$

$G_{H_C^{\′}}^{\′}=G_{H_C}-\mathrm{LUT}\left(S\right),$

$B_{H_C^{\′}}^{\′}=B_{H_C}+\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal,

$\left(5\right),R_{H_B^{\′}}^{\′}=R_{H_B}+\mathrm{LUT}\left(S\right),$

$G_{H_B^{\′}}^{\′}=G_{H_B}-\mathrm{LUT}\left(S\right),$

$B_{H_B^{\′}}^{\′}=B_{H_B},$

Wherein

Be this output image signal,

Be this image input signal,

$\left(6\right),R_{H_M^{\′}}^{\′}=R_{H_M}+\mathrm{LUT}\left(S\right),$

$G_{H_M^{\′}}^{\′}=G_{H_M},$

$B_{H_M^{\′}}^{\′}=B_{H_M}-\mathrm{LUT}\left(S\right),$

Wherein

Be this output image signal,

Be this image input signal, LUT (S) is the side-play amount of this image input signal in this color gamut space.

7, color conversion circuit as claimed in claim 6 is characterized in that, this color gamut space is a HSV color attribute pattern.

8, color conversion circuit as claimed in claim 7, it is characterized in that, this color gamut space equals on 0 the plane at V be to be a HS plane, and this HS plane is to divide into a first area, a second area, one the 3rd zone, one the 4th zone, one the 5th zone and one the 6th zone.

9, color conversion circuit as claimed in claim 6 is characterized in that, described Mathematical Modeling is to comprise coherent numerical value of the same colour, a chroma parameter value and a luminance parameter value.

10, color conversion circuit as claimed in claim 6 is characterized in that, described Mathematical Modeling is to be respectively:

$\left(1\right),R_{H_R^{\′}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_{H_R},$

$G_{H_R^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_R}-d{C}_{H_R}+{\mathrm{dL}}_{H_R},$

$B_{H_R^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_R}-{\mathrm{dC}}_{H_R}+{\mathrm{dL}}_{H_R},$

Wherein $\mathrm{Max}=\max \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right),$ $\mathrm{Min}=\min \left(R_{H_R}{G}_{H_R}{B}_{H_R}\right),$ μ ₁And μ ₂Be a constant,

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(2\right){,R}_{H_Y^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_Y}+{\mathrm{dL}}_{H_Y},$

$G_{H_Y^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_Y}+{\mathrm{dL}}_{H_Y},$

$B_{H_Y^{\′}}^{\′}=\mathrm{Min}-{\mathrm{dC}}_{H_Y}+{\mathrm{dL}}_{H_Y},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(3\right){,R}_{H_G^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_G}-d{C}_{H_G}+{\mathrm{dL}}_{H_G},$

$G_{H_G^{\′}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_{H_G},$

$B_{H_G^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_G}-{\mathrm{dC}}_{H_G}+{\mathrm{dL}}_{H_G},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(4\right){,R}_{H_C^{\′}}^{\′}=\mathrm{Min}-{\mathrm{dC}}_{H_C}+{\mathrm{dL}}_{H_C},$

$G_{H_C^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_C}+{\mathrm{dL}}_{H_C},$

$B_{H_C^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_C}+{\mathrm{dL}}_{H_C},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value, Be this luminance parameter value,

$\left(5\right),R_{H_B^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_B}-{\mathrm{dC}}_{H_B}+d{C}_{H_B},$

$G_{H_B^{\′}}^{\′}=\mathrm{Min}+{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_B}-{\mathrm{dC}}_{H_B}+{\mathrm{dL}}_{H_B},$

$B_{H_B^{\′}}^{\′}=\mathrm{Max}+{\mathrm{dL}}_{H_B},$

Wherein

Be this form and aspect parameter value,

Be this chroma parameter value,

Be this luminance parameter value,

$\left(6\right),R_{H_M^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_2\×{\mathrm{dH}}_{H_M}+{\mathrm{dL}}_{H_M},$

$G_{H_M^{\′}}^{\′}=\mathrm{Min}-{\mathrm{dC}}_{H_M}+{\mathrm{dL}}_{H_M},$

$B_{H_M^{\′}}^{\′}=\mathrm{Max}-{\mathrm{\μ}}_1\×{\mathrm{dH}}_{H_M}+{\mathrm{dL}}_{H_M},$

Wherein

Be this form and aspect parameter value, Be this chroma parameter value,

Be this luminance parameter value.

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