CN1991969B - Color adjusting method and device for display - Google Patents

Abstract

A digital color adjustment method and device for a display receives digital pixel color data (such as RGB), performs digital color adjustment, and then transmits adjustment parameter information to the display for display. By adjusting the hue difference correspondence table and the saturation matching correspondence table, the color gamut matching of the best color rendering characteristics and the preference color adjustment of independent colors can be performed separately or simultaneously. The test pattern on the display is evaluated by an observer or measured by an instrument, and the adjustment value is input through the human-computer interface. The continuity adjustment curve of the correspondence table is established using a numerical method, and the hue difference correspondence table and the saturation matching correspondence table are updated to achieve the color gamut matching of the display and the output effect of the preference color of independent colors.

Description

Display color adjustment method and device

technical field

The invention relates to a color adjustment method and device of a display, and in particular to the adjustment of hue, saturation and color gamut matching of a color image of the display.

Background technique

Existing display color adjustment includes color gamut matching and preference color adjustment. The so-called gamut matching, for example, desaturates or increases the saturation of red and green, or shifts the saturation of yellow hue, etc. The preferred color adjustment refers to the adjustment of an independent color, such as grass, sky, skin color, etc., without affecting other colors.

Limited to overall hue, saturation, and brightness adjustments, ordinary monitors cannot provide independent hue color adjustments. Some high-end monitors provide advanced hue (six axes) and brightness (Gamma) adjustments, and can be adjusted for specific individual colors.

Taking the existing color adjustment technology as an example, US Patent No. 6,122,012 discloses a color adjustment technology for digital color images. Convert the RGB (red, green, blue) color information in the image to RGBCMY (red, green, blue, cyan, magenta, yellow) six-color information, and then use the six-color corresponding table (lookup table) and color control The circuit adjusts the saturation (Saturation)/brightness (Intensity), and finally converts the brightness (Y), blue (Cb) and red (Cr) signals to output to the image. The six-color correspondence table is established from the relationship between an original image and an adjusted target image.

In addition, US Pat. No. 6,791,716 also discloses a preferred color adjustment technology. Convert the color space of digital color (RGB) to CIELab color space, and then convert it to brightness-chroma-hue (LCH), and perform continuous and smooth chroma conversion within the preset color range to obtain preset preferences color output. However, its disadvantage is that its hardware structure is relatively complex, resulting in increased circuit costs.

However, the above-mentioned prior art cannot provide the best and consistent output results of the display, because in order to achieve a better adjustment effect, the color adjustment hardware device needs a lot of computing time, which leads to difficulties in actual application.

Therefore, there is a need for a color adjustment method and device for a display, which can achieve real-time calculation/conversion without complex software/hardware. Color gamut matching and independent color adjustment can also be performed separately or simultaneously, and it has a good color adjustment effect.

Contents of the invention

Therefore, one of the objectives of the present invention is to provide a method and device for adjusting the color of a display, the hardware and software of which have high feasibility.

Another object of the present invention is to provide a color adjustment method and device for a display. The color adjustment principle does not require complicated calculations and can achieve real-time calculations/conversions.

Another object of the present invention is to provide a color adjustment method and device for a display, which can perform color gamut matching and independent color adjustment independently or simultaneously, and the color adjustment effect is remarkable.

In order to achieve the above or other objectives, an embodiment of the present invention provides a digital color adjustment device, which can be applied to a display to perform color gamut matching and independent color adjustment of the display. The digital color adjustment device includes a color space conversion circuit, a hue Difference correspondence table, saturation matching correspondence table, adder, multiplier, and inverse color space conversion circuit.

In the above-described embodiments, the color space conversion circuit converts pixel color data (RGB) into YCH color signals. Through the hue difference correspondence table, a hue difference value is generated according to the hue component (H) of the color signal. Through the saturation matching table, a saturation matching value (Gc) is generated according to the hue component of the color signal. This hue difference value is added to the original hue component to generate a new hue component (H). The saturation matching value is multiplied by the original saturation component and the saturation matching value to generate a new saturation (C). The inverse color space conversion circuit performs inverse color space conversion according to the new H signal, the new C signal and other signal components of the color signal to generate a pixel color data (RGB).

Another embodiment of the present invention provides a digital color adjustment method for a display, which is used for adjusting the color gamut of the display. The method includes: inputting the hue difference value and the saturation matching value of the multi-hue axis; according to the hue difference value and the saturation matching value of the multi-hue axis, establishing a hue difference correspondence table and a saturation matching correspondence table through a numerical method; Download/update the hue difference correspondence table and saturation matching correspondence table to the hue difference correspondence table and saturation matching correspondence table in the display; and watch or measure the test pattern on the display to evaluate the result.

Another embodiment of the present invention provides a digital color adjustment method for a display, which is used for independent color adjustment of the display. The method includes: selecting or adding the independent color to be adjusted; inputting the hue difference value and the saturation matching value of the independent color; according to the recorded hue difference value and the saturation matching value of the independent color, establishing a correspondence through a numerical method The continuous adjustment curve of the table; download/update the established hue difference correspondence table and saturation matching correspondence table to the hue difference correspondence table and saturation matching correspondence table in the display; Test patterns are used to evaluate the results.

Another embodiment of the present invention provides a digital color adjustment method for a display, which is used for color gamut matching and independent color adjustment of the display. The method includes: inputting the hue difference value and saturation matching value of multi-hue axes; selecting or adding the independent color to be adjusted; inputting the hue difference value and saturation matching value of the independent color; The matching value is to establish a hue difference correspondence table and a saturation matching correspondence table by a numerical method; download/update the established hue difference correspondence table and the saturation matching correspondence table to the hue difference correspondence table and the saturation matching correspondence table in the display ; and evaluating the result by an observer or measuring the test pattern displayed on the display with an instrument. The test pattern of each embodiment of the present invention can be generated by selecting any single color or multiple colors in the image, and can also be generated by a color chart.

In order to make the above-mentioned and other features and advantages of the present invention more comprehensible, preferred embodiments are described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is a functional block diagram of an embodiment of the present invention.

FIG. 2 is a functional block diagram of the color adjustment device in FIG. 1 .

Fig. 3 is the initial state of the hue difference correspondence table and the saturation matching correspondence table.

Figure 4 is a test pattern for color gamut matching adjustment.

Figure 5 is the software interface for color gamut matching adjustment.

FIG. 6 is one example of a hue difference correspondence table and a saturation matching correspondence table for color gamut matching adjustment.

FIG. 7 is a flow chart of color gamut matching adjustment.

Figure 8 is the software interface for independent color adjustment.

FIG. 9 is one example of a hue difference correspondence table and a saturation matching correspondence table for independent color output adjustment.

FIG. 10 is a flow chart of independent color adjustment.

FIG. 11 is one example of a hue difference correspondence table and a saturation matching correspondence table for simultaneously performing color gamut matching and independent color adjustment.

FIG. 12 is a flow chart of simultaneous color gamut matching and independent color adjustment.

Description of main component marking

110: Display drive circuit

120: Digital color adjustment device

140: display

160: Man-machine interface

210: Color conversion circuit

220: Hue phase conversion circuit

230: Multiplier

235: Saturation matching table

240: Adder

245: Hue difference correspondence table

250: Inverse hue conversion circuit

260: Inverse color conversion circuit

Detailed ways

An embodiment of the present invention provides a digital color adjustment device for a display. The device including a digital color adjustment function receives pixel color data sent by a display driving circuit, performs digital color adjustment, and then transmits it to the display for display. This digital color adjustment device uses the independent hue adjustment hue difference correspondence table and the multi-hue saturation matching correspondence table to perform color gamut matching for optimal color rendering characteristics and independent color adjustment for preferred color adjustment separately or simultaneously according to requirements. The observer evaluates or measures the test pattern on the display with an instrument, enters the adjustment value through the man-machine interface, uses the numerical method to establish the continuity adjustment curve of the corresponding table, and is used to update the hue difference corresponding table and saturation of the digital color adjustment device Match the corresponding table to achieve the color gamut matching of the display and the output effect of independent color preference and color adjustment.

Another embodiment of the present invention provides a method for color gamut matching and independent color adjustment of a display. After setting the hue difference and saturation matching values to be adjusted, a continuous adjustment curve of the hue difference correspondence table and the saturation matching correspondence table is established using, for example, a numerical method. Next, the hue difference correspondence table and the saturation matching correspondence table in the display are updated by using the established adjustment curve. In addition, the pixel color data RGB (for example, transmitted by the display driving circuit) is also converted into the color space of the YUV signal and the YHC signal commonly used in TV. Then, according to the (updated) hue difference correspondence table and saturation matching correspondence table in the display corresponding to the hue value H, the hue difference value and saturation matching value to be adjusted for the color are obtained. Adjust the hue value H and saturation value C according to the hue difference value and saturation matching value. And according to the original brightness value Y, the adjusted hue value H and saturation value C are reverse-converted to obtain the adjusted pixel color data RGB, and finally sent to the display for display.

FIG. 1 is a functional block diagram according to an embodiment of the present invention. The display driving circuit 110 transmits the pixel color data R1G1B1. The digital color adjustment device 120 receives the pixel color data R1G1B1 and performs digital color adjustment of hue difference and saturation matching to obtain adjusted pixel color data R6G6B6. Next, the adjusted pixel color data R6G6B6 is sent to the display 140 for display.

A hue difference correspondence table and a saturation matching correspondence table related to hue difference adjustment and saturation matching adjustment are provided by the man-machine interface 160 . When creating a hue difference correspondence table and a saturation matching correspondence table, the user watches or measures the test pattern on the display 140 through the man-machine interface 160, and performs color gamut matching and favorite color (independent color) adjustment separately or simultaneously. Using the entered hue difference adjustment value and saturation matching adjustment value, a numerical method is used to build a continuous adjustment curve of the corresponding table. Numerical methods can use various interpolation methods to compute continuous uniform curves. Next, download the established hue difference correspondence table and saturation matching correspondence table to the hue difference correspondence table and saturation matching correspondence table in the digital color adjustment device 120 to achieve the color gamut matching and independent color adjustment output effect of the display 140 .

The structure of the digital color adjustment device 120 in FIG. 1 is shown in FIG. 2 . The digital color adjustment device 120 includes a color conversion circuit 210 , a hue conversion circuit 220 , a multiplier 230 , a saturation matching table 235 , an adder 240 , a hue difference table 245 , an inverse hue conversion circuit 250 and an inverse color conversion circuit 260 .

The color conversion circuit 210 receives the pixel color data R1G1B1 transmitted from the display driving circuit 110 and converts the color data into a TV signal Y2U2V2 through color conversion. Next, the color conversion circuit 210 transmits the converted TV signal Y2U2V2 to the hue conversion circuit 220 . The hue conversion circuit 220 performs hue conversion to convert the TV signal Y2U2V2 into a brightness-saturation-hue signal Y3C3H3. The saturation matching table 235 and the hue difference table 245 are provided/updated by the man-machine interface 160 of FIG. 1 .

The H3 signal corresponds to the hue difference value ΔH through the hue difference correspondence table 245, where -180°≤ΔH≤180°. The adder 240 adds the hue difference value ΔH to the H3 signal to form an adjusted hue value H4. The H3 signal corresponds to the saturation matching value Gc through the saturation matching table 235 . In order to achieve better adjustment results, in this embodiment, Gc is between 0.5-2. The multiplier 230 multiplies the saturation matching value Gc and the C3 signal to obtain an adjusted saturation value C4. The inverse color phase conversion circuit 250 performs inverse color phase conversion on the signal Y3C4H4 to obtain the TV signal Y5U5V5. The inverse color conversion circuit 260 converts the TV signal Y5U5V5 back to the pixel color data R6G6B6 and outputs it to the display 140 for display.

In this embodiment, the structures of the color conversion circuit 210, the hue conversion circuit 220, the multiplier 230, the adder 240, the inverse hue conversion circuit 250 and the inverse color conversion circuit 260 are not particularly limited, as long as the required functions can be achieved. . The color conversion circuit 210 and the hue conversion circuit 220 may be collectively referred to as a color space conversion circuit. The inverse hue conversion circuit 250 and the inverse color conversion circuit 260 can be collectively referred to as an inverse color space conversion circuit.

The digital color adjustment device can be in the form of software, firmware or electronic hardware circuit. In addition, the above-mentioned YUV TV signal can use other formats such as Y, B'-Y', R'-Y' or YC _B C _R.

The initial states of the hue difference correspondence table 245 and the saturation matching correspondence table 235 are shown in FIG. 3 . In Fig. 3, Hi is the input hue value and ΔH is the corresponding hue difference value, and Gc is the corresponding saturation matching value. Since there is no hue difference and saturation change in the initial state, the corresponding value ΔH in each input Hi is 0, and the corresponding value Gc in each input Hi is 1. Corresponding to the initial state, the color information R1G1B1 input to the digital color adjustment device 120 is directly output without any color adjustment.

In this embodiment, the digital color adjustment of the display can be divided into three types: (1) performing color gamut matching adjustment of the display; (2) performing independent color adjustment of the display; and (3) simultaneously performing color gamut matching and adjustment of the display Independent color adjustment. The usage methods are described as follows.

(1) Adjust the color gamut matching of the display

The basic test pattern for adjusting the color gamut of the display is shown in FIG. 4, and the test pattern is displayed on the display 140. In FIG. Color patches of blue, cyan, magenta, and yellow for observers to evaluate in real time or instrumentally measure the results of color adjustments.

The software interface for adjusting the color gamut of the display is shown in Figure 5 as an example. After selecting the color axis to be adjusted, the user can drag the hue difference scroll bar to change the output hue value of the color axis, or drag the saturation gain scroll bar to change the output saturation of the color axis.

After the user inputs the hue difference adjustment value and the saturation matching adjustment value, the present embodiment establishes the continuity adjustment curve through a numerical method. For example, if the user increases the red hue by 10 and the green hue by 10, and increases the yellow saturation by 1.2 times and the blue-green saturation by 0.8 times, the created hue difference correspondence table and saturation matching correspondence table are shown in FIG. 6 .

Next, how the present embodiment performs color gamut matching adjustment will be described. Please refer to FIG. 7 , which shows a flow chart of how to adjust the color gamut matching in this embodiment. First, the user selects the color axis to be adjusted, as shown in step 708 . Next, drag the hue scroll bar to change the hue difference value of the color axis, or drag the saturation scroll bar to change the output saturation of the color axis, as shown in step 710 . The so-called multi-axis refers to at least three color adjustment axes and at most 12 color adjustment axes. The user's input method can be shown in FIG. 5 , which will not be repeated here. Next, the man-machine interface establishes the continuity adjustment curve of the hue difference correspondence table and the saturation matching correspondence table through a numerical method according to the above-mentioned multi-axis hue difference value and saturation matching value, as shown in step 712 . The saturation matching adjustment value can be achieved by linear and nonlinear methods.

Afterwards, the man-machine interface 160 transmits the established hue difference correspondence table and saturation matching correspondence table (for example, as shown in FIG. 6 ) to the digital color adjustment device 120 to update the hue difference correspondence table 245 in the digital color adjustment device 120 and saturation matching table 235, as shown in step 714. As mentioned above, when the hue difference correspondence table 245 and the saturation matching correspondence table 235 are updated, the H4 and C4 signals will be affected jointly, so that the signal R6G6B6 output by the digital color adjustment device 120 will change, that is, the signal on the display 140 will be changed. The test pattern changes.

Next, an observer evaluates or measures the adjusted test pattern displayed on the display 140 to evaluate the result, so as to confirm whether the adjusted test pattern meets the requirements, as shown in steps 716 and 718 . If the requirements can be met, the color gamut matching adjustment has been achieved. If the requirements cannot be met, the user selects the color axis again and inputs another group of multi-axis hue difference values and saturation matching values until the color adjustment effect is met.

The adjustment of the saturation matching value can be configured by a linear method or a non-linear method.

(2) Perform independent color adjustment of the monitor

The software interface for adjusting the independent color output of the display is shown in Figure 8 as an example. As for the independent color adjustment process, it is shown in FIG. 10 . First, the user records and selects the independent color (such as skin color, sky color, etc.) to be adjusted, as shown in step 1001 . Next, the user inputs/changes the hue difference value and saturation matching value of the individual colors, as shown in step 1003 . A detailed implementation of step 1003 is, for example, that the user drags the hue scroll bar to change the hue difference value of the color, or drags the saturation scroll bar to change the output saturation of the color.

Next, the man-machine interface 160 calculates the hue difference correspondence table and the saturation matching correspondence table of the continuity curve by a numerical method, as shown in step 1005 . For example, if the user increases the hue of the skin color by 5 and the saturation by 1.4 times, and decreases the hue of the sky by 5 and increases the saturation by 1.2 times, the established hue difference correspondence table and saturation matching correspondence table are shown in FIG. 9 . Next, download the established hue difference correspondence table and saturation matching correspondence table to the color adjustment device through the man-machine interface, as shown in step 1007 .

Then, the adjusted test pattern displayed on the display 140 is evaluated by an observer or measured by an instrument to evaluate the result, to confirm whether the adjusted test pattern meets the requirements, as shown in steps 1009 and 1011. If the requirements can be met, then The independent color adjustment has been achieved. If the requirements cannot be met, the user will perform steps 1001-1007 again until the required adjustment effect of the independent color is met.

The above-mentioned independent color adjustment means to adjust the hue and saturation of a certain hue, and the adjustment result only affects the chroma within a certain range near the selected color.

(3) Simultaneously perform color gamut matching and independent color adjustment of the display

The process of simultaneously performing color gamut matching and independent color adjustment of the display is shown in FIG. 12 . First, the user selects the color axis and independent color to be adjusted, as shown in step 1201 . Here, the user can select the color axis and independent color through the software interface shown in FIG. 5 and FIG. 8 . Next, the user drags the hue scroll bar to change the hue difference value of the color axis, or drags the saturation scroll bar to change the output saturation of the color axis, as shown in step 1203 . The so-called multi-axis has at least three color adjustment axes and a maximum of 12 color adjustment axes. Alternatively, the user inputs/changes the hue difference value and saturation matching value of the individual colors, as shown in step 1205 . A detailed implementation of step 1205 is, for example, that the user drags the hue scroll bar to change the hue difference value of the color, or drags the saturation scroll bar to change the output saturation of the color. Please note that the execution order of steps 1203 and 1205 is not fixed, and the order can be interchanged.

Next, the man-machine interface 160 calculates the hue difference correspondence table and the saturation matching correspondence table of the continuity curve by a numerical method, as shown in step 1207 . The established hue difference correspondence table and saturation matching correspondence table are shown in FIG. 11 . Download the established hue difference correspondence table and saturation matching correspondence table to the color adjustment device through the man-machine interface, as shown in step 1209 .

Next, the adjusted test pattern displayed on the display 140 is evaluated by an observer or measured by an instrument to determine whether the adjusted test pattern meets the requirements, as shown in steps 1211 and 1213 . If the requirements can be met, the independent color adjustment has been achieved. If the requirements cannot be met, the user performs steps 1201-1209 again until the desired adjustment effect is achieved.

The above-mentioned color gamut matching and saturation matching corresponding tables for independent color adjustment may be designed to share one corresponding table, or may be designed to have their own corresponding tables.

The display digital color adjustment method and device thereof disclosed in the embodiments of the present invention can provide color gamut matching for optimum color rendering characteristics of the display and independent color adjustment for preferred color adjustment. In addition to accurately converting the original color to the color to be adjusted, the continuous adjustment curve can also make the surrounding color of the color have a continuous change, so that the tone of the adjusted color image is more natural. In addition, the above-mentioned embodiments are relatively simple in operation for color conversion, highly feasible in hardware implementation, and have good adjustment effects. The embodiment of the present invention is based on the digital color adjustment method of the independent hue adjustment hue difference correspondence table and the multi-hue saturation matching correspondence table to achieve the best and consistent output results of the display, and proposes a hardware device that can realize the color adjustment method.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (13)

1. a digit color regulation device applicable to display, carries out the colour gamut coupling and the independent tone of this display and puts in order, and it is characterized in that this digit color regulation device comprises:

Color space converting circuit converts received image signal to the chrominance signal with the first form and aspect composition and first saturation degree;

Form and aspect difference corresponding tables, it adjusts curve continuously is to set up by the form and aspect difference adjusted value of input, goes out the form and aspect difference value of this first form and aspect composition with the curve of the adjustment continuously correspondence of utilizing this form and aspect difference corresponding tables;

Saturated coupling corresponding tables, it adjusts curve continuously is to set up by the saturated coupling adjusted value of input, goes out the saturated matching value of this first form and aspect composition with the curve of the adjustment continuously correspondence of utilizing this saturated coupling corresponding tables;

First arithmetic element receives this first form and aspect composition and this form and aspect difference value of this chrominance signal, and in response to this first form and aspect composition of this chrominance signal and this form and aspect difference value and produce the second form and aspect composition;

Second arithmetic element, this first saturation degree that receives this chrominance signal and this saturated matching value, and produce second saturation degree in response to this first saturation degree of this chrominance signal and this saturated matching value; And

Contrary color space converting circuit receives this second form and aspect composition and this second saturation degree that this first and second arithmetic element produces, and other signal composition of this chrominance signal, carries out contrary color space transformation, to produce output image signal.

2. digit color regulation device according to claim 1 is characterized in that this digit color regulation device can be software, firmware or electronic hardware circuit.

3. digit color regulation device according to claim 1 is characterized in that this form and aspect difference value scope is between-180 °～180 °.

4. digit color regulation device according to claim 1 is characterized in that this saturated matching value scope is between 0.5～2.

5. digit color regulation device according to claim 1 it is characterized in that this first arithmetic element is a totalizer, and this second arithmetic element is a multiplier.

6. the digital color method of adjustment of a display is used to carry out the colour gamut coupling adjustment of this display, it is characterized in that this method comprises:

Import the form and aspect difference value and the saturated matching value of many hue axis;

According to this form and aspect difference value and this saturated matching value of many hue axis, set up form and aspect difference corresponding tables and saturated coupling corresponding tables by numerical method;

Form and aspect difference corresponding tables and saturated coupling corresponding tables in this display are downloaded/be updated to this form and aspect difference corresponding tables of being set up and saturated coupling corresponding tables; And

Watch or measure test pattern on the display in order to assessment result.

7. method according to claim 6 is characterized in that many hue axis comprise the three color scheme bearing at least, comprises 12 tone bearings at most.

8. method according to claim 6 is characterized in that this numerical method comprises:

Use method of interpolation to calculate the continuously even curve of this form and aspect difference corresponding tables and this saturated coupling corresponding tables.

9. the digital color method of adjustment of a display, the independent tone that is used to carry out this display is whole, it is characterized in that this method comprises:

Select or increase the independent look of desire adjustment;

Import the form and aspect difference value and the saturated matching value of this individual color;

According to this form and aspect difference value and this saturated matching value of this individual color that is write down, set up the continuous adjustment curve of corresponding tables by numerical method;

Form and aspect difference corresponding tables and saturated coupling corresponding tables in this display are downloaded/be updated to this form and aspect difference corresponding tables of being set up and saturated coupling corresponding tables; And

Watch or measure test pattern on the display in order to assessment result.

10. method according to claim 9 is characterized in that this numerical method comprises: use method of interpolation to calculate the continuously even curve of this form and aspect difference corresponding tables and this saturated coupling corresponding tables.

11. the digital color method of adjustment of a display, the colour gamut coupling and the independent tone that are used to carry out this display are whole, it is characterized in that this method comprises:

Import the form and aspect difference value and the saturated matching value of many hue axis;

Select or increase the independent look of desire adjustment;

Import the form and aspect difference value and the saturated matching value of this independent look;

According to this form and aspect difference value and this saturated matching value of above-mentioned steps, set up form and aspect difference corresponding tables and saturated coupling corresponding tables by numerical method;

Form and aspect difference corresponding tables and saturated coupling corresponding tables in this display are downloaded/be updated to this form and aspect difference corresponding tables of being set up and this saturated coupling corresponding tables; And be shown in test pattern on this display in order to assessment result with observer assessment or with apparatus measures.

12. method according to claim 11 is characterized in that this numerical method comprises: use method of interpolation to calculate the continuously even curve of this form and aspect difference corresponding tables and this saturated coupling corresponding tables.

13. method according to claim 11 is characterized in that this saturated matching value can be made of linear mode and nonlinear way.

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