CN103379347A - Apparatus for generating correction parameter - Google Patents

Abstract

The invention provides an apparatus for generating a correction parameter. The apparatus comprises an independent region determination unit, a mapping corresponding table, a weight unit and a multiplier. The independent region determination unit receives an image signal from outside and calculates a correction region address value based on image components of the image signal; the mapping corresponding table searches a correction parameter corresponding to the correction region address value; the weight unit generates weight and then output the weight based on a color difference signal; and the multiplier carries out a multiplication operation on the output weight and the correction parameter, so that the final correction parameter is obtained and output. The apparatus for generating the correction parameter generates the correction parameter mainly based on the input image signal and the color difference signal simultaneously so as to solve the problem of image color contour. Compared with the conventional technology, the purpose of a relatively-good independent color tuning quality is achieved without complex color space conversion.

Description

The correction parameter generation device

Technical field

The present invention relates to a kind of correction parameter generation device, mainly for generation of correction chroma and the luminance signal of adjusting image display.

Background technology

With the fast development of work video technique, the kind of video interface is also more and more.In the widely used chromatic image signal specification of present institute, the analogy videl signal of main flow has composite video (Composite), S-video (S-video), VGA port RGB, and component signal (Component).

The color that chromatic image presents is the key factor that the image information presents.Color has three basic attributes: form and aspect, brightness, saturation, and wherein, form and aspect (Hue) are the differences between the expression colour system; Brightness (Brightness) is the bright-dark degree of expression color; Saturation (Saturation) is the purity of expression color, also can be described as the chroma of color.The chromatic image signal has comprised R, G, B three primary colors signal.When the data transmission of a large amount of color signals, the technology that usually can see through coding, decoding is carried out the processing of image signal.

In present audio-visual design the aberration video terminal generally used be videl signal to be separated into 3 different signal components (Component) carry out the transmission of signal data.The brightness that these 3 signals are respectively the chromatic image signals (being luminance signal Y), and color-difference signal Pb, Pr.

In existing patented technology, there is the various technology of employing to carry out the processing of image signal.For example U.S.'s patent of invention case application number is in the Patent Case of 20040021671A1, and it exposes a kind of color space conversion circuit that can regulate to the saturation of image signal, brightness, to form and aspect when.This patent case, although can reach quite complete chromatic image quality regulatory function, it is designed for the basis that whole circuit design is based on hardware, so whole circuit very complex.

For example U.S.'s patent of invention publication number is in the Patent Case of 20070086030A1 again, and it exposes a kind of change-over circuit and method of chromatic image signal.In this patent case, whole treatment circuit needs complicated matrix operation, and the number of regions that can independently adjust is restricted, and can't integrate whole district's adjustment mechanism of brightness, saturation and form and aspect.

For example U.S.'s patent of invention case application number is in 6552751 the Patent Case again, and the treatment circuit that it exposes a kind of image signal is used for adjusting brightness, contrast, form and aspect of chromatic image signal etc.The image signal of input is processed by a signal processing circuit after can converting brightness and color-difference signal to by the first matrix circuit first again, converts back image signal by the second matrix circuit again.In this patent case, whole treatment circuit also needs complicated matrix operation and conversion.

For example U.S.'s patent of invention case application number is in 4679072 the Patent Case again, it exposes the device that a kind of image signal is regulated, it mainly is the adjusting of carrying out image signal with the rotation of axes of coordinates, although have more easy circuit framework, but the regulatory function of the color signal quality that can reach is limited, does not meet the actual demand of modern image documentation equipment.

By traditional technical Analysis, different technology has still existed the color space conversion program complicated, can't reach individual color and color gamut conversion, need the complex mathematical computing, need larger corresponding souvenir to recall the space, need the additional complexity circuit could integrate simultaneously the shortcomings separately such as the whole district and isolated area adjustment, in addition, on the prior art, usually only according to color-difference signal or one of them information of form and aspect signal of image signal, determine that its independent zones correction value output delivers to the independent zones adjusting device of a chromatic image, this conventional art is on showing, easy coloured class generation, and cause the deteriorated of image quality.

Summary of the invention

Main purpose of the present invention is providing a kind of correction parameter generation device, this device comprises an independent zones determining means, the image signal that reception comes from the outside, and according to the red image component in this image signal, a green image component and a blue image component, calculate a correcting area address value and output;

The corresponding table of one mapping is connected with this independent zones determining means, receives this correcting area address value, and finds out a correction parameter that should correcting area address value and export; One weights unit receives the color-difference signal that comes from the outside and converted to by this image signal, and will produce weights output behind the corresponding table of the corresponding weights of this color-difference signal; And a multiplier, connect with this weights unit and the corresponding table of this mapping, receive weights and this correction parameter through the generation of weights unit, and these weights and this correction parameter are carried out multiplying, also export and obtain a correction of a final proof parameter.

Correction parameter generation device of the present invention, mainly be to utilize simultaneously RGB signal and the color-difference signal of input image to produce a correction parameter, problem for the image color spot (color contour) that improves independent zones chromatic image calibration apparatus, compared to traditional color signal treatment technology, do not need complicated color space conversion, can reach the purpose of better individual color adjustment quality.

Description of drawings

Fig. 1 is the cell schematics of correction parameter generation device of the present invention;

Fig. 2 is the corresponding relation figure of the corresponding table of weights of weights of the present invention unit;

Fig. 3 is the flow chart of the determining method of correcting area address value of the present invention;

Fig. 4 is the particular flow sheet of calculation step among Fig. 3 of the present invention.

Among the figure, 1, the correction parameter generation device, 10, the independent zones determining means, 20, the corresponding table of mapping, 30, the weights unit, 40, multiplier.

Embodiment

Those skilled in the art below cooperate graphic and component symbol is done more detailed description to embodiments of the present invention, so that can implement after studying this specification carefully according to this.

Consult Fig. 1, the cell schematics of correction parameter generation device of the present invention.As shown in Figure 1, correction parameter generation device 1 of the present invention comprises an independent zones determining means 10, mapping corresponding table 20, a weights unit 30 and a multiplier 40.Independent zones determining means 10 receives the image signal RGB that comes from the outside, and according to the value of the red image components R among the image signal RGB, green image component G, blue image component B, calculates a correcting area address value Sh and export the corresponding table 20 of mapping to.

Shining upon corresponding table 20 is connected with this independent zones determining means 10, reception is from the correcting area address value Sh of independent zones determining means 10, and find out correction parameter dX and output that should correcting area address value Sh, wherein, this correction parameter dX comprises at least one in brightness correction parameter and the form and aspect correction parameter.

Weights unit 30 receives and comes from the outside, by the color-difference signal T of image signal RGB conversion, and will produce weights Cf output behind the corresponding table of the corresponding weights of this color-difference signal T.Wherein, this color-difference signal T includes among analogy color-difference signal Pb, Pr or numerical digit color-difference signal Cb, Cr or U, V or I, the Q one.The explanation as an example of an aberration signal Cb, Cr example, these weights Cf can be the corresponding relation of an aberration signal Cb, Cr, i.e. Cf=F (Cb ²+ Cr ²), being illustrated in figure 2 as the corresponding corresponding relation figure that shows of these weights, this figure transverse axis is input value (Cb ²+ Cr ²), this figure longitudinal axis is output weights Cf, the corresponding curve of the weights of this marginal data can be finished this corresponding relation or be finished by more than one item mathematics formula by corresponding showing when practical application.Wherein, these weights Cf output area is between 0～1.Fig. 2 is the corresponding relation figure of the corresponding table of weights, if finished by more than one item mathematics formula, can be exemplified below:

(1)

$\mathrm{Cf}=F({\mathrm{Cb}}^2+C{r}^2)=\left\{\begin{array}{c}{a}_1(C{b}^2+{\mathrm{Cr}}^2)+b_1;\mathrm{for}{\mathrm{Cb}}^2+{\mathrm{Cr}}^2<5\\ a_2({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)+b_2;\mathrm{for}5\&le;{\mathrm{Cb}}^2+{\mathrm{Cr}}^2\&le;80\\ a_3({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)+b_3;\mathrm{for}80\&le;{\mathrm{Cb}}^2+{\mathrm{Cr}}^2\&le;100\\ 1;\mathrm{for}{\mathrm{Cb}}^2+{\mathrm{Cr}}^2>100\end{array}\right.$

(2)

$\mathrm{Cf}=F({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)=\left\{\begin{array}{c}{a}_1{({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)}^2+b_1({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)+C_1;\mathrm{for}{\mathrm{Cb}}^2+{\mathrm{Cr}}^2<15\\ a_2{({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)}^2+b_2({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)+C_2;\mathrm{for}15\&le;{\mathrm{Cb}}^2+{\mathrm{Cr}}^2\&le;70\\ a_3{({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)}^2+b_3({\mathrm{Cb}}^2+{\mathrm{Cr}}^2)+C_3;\mathrm{for}70\&le;{\mathrm{Cb}}^2+{\mathrm{Cr}}^2\&le;100\\ 1;\mathrm{for}{\mathrm{Cb}}^2+{\mathrm{Cr}}^2>100\end{array}\right.$

In formula (1) and the formula (2), a ₁～a ₃, b ₁～b ₃, C ₁～C ₃Be with reference to coefficient.

Multiplier 40 is with weights unit 30 and shine upon corresponding table 20 connection, receives these weights Cf and this correction parameter dX, and carries out multiplying, and obtain a correction of a final proof parameter d X1, and export the independent zones adjusting device (not shown) of a chromatic image to.

Consult Fig. 3, the flow chart of the determining method of correcting area address value of the present invention.The method S1 that determines correcting area address value Sh in the independent zones determining means 10 comprises receiving step S10, definition step S20, difference calculation procedure S30 and calculation step S40.Receiving step S10 receives the image signal RGB that comes from the outside; Definition step S20 is that the maximum that defines among red image components R, green image component G and the blue image component B is that Vmax, minimum value are Vmin; Difference calculation procedure S30 deducts maximum Vmax minimum value Vmin and obtains a difference DELTA V, i.e. Δ V=Vmax-Vmin; Calculation step S40 is that Vmax, minimum value are that Vmin and difference DELTA V calculate correcting area address value Sh according to maximum.

Consult the particular flow sheet that Fig. 4 is calculation step S40 among Fig. 3 of the present invention.Calculation step S40 judges at first whether difference DELTA V is zero, if difference DELTA V is zero, determine that then correcting area address value Sh is zero and exports, if difference DELTA V is non-vanishing, judge then whether red image components R is maximum Vmax, if red image components R is maximum Vmax, determine that then correcting area address value Sh is 60* (G-B)/Δ V, and judge that whether correcting area address value Sh is less than zero, when correcting area address value Sh is not less than zero, with correcting area address value Sh output, if correcting area address value Sh less than zero, then exports correcting area address value after with Sh '=Sh+360; If the non-maximum Vmax of red image components R judges then whether green image component G is maximum, if green image component G is maximum, determine that then correcting area address value Sh is 120+60* (B-R)/Δ V; If green image component G is not maximum, determine that then correcting area address value Sh is 240+60* (R-G)/Δ V, and judge that whether correcting area address value Sh is less than zero, when correcting area address value Sh is not less than zero, with correcting area address value Sh output, if correcting area address value Sh exports correcting area address value after with Sh '=Sh+360 less than zero.

Correction parameter generation device of the present invention, mainly be to produce a correction parameter according to input image signal and color-difference signal simultaneously, problem for the image color spot (color contour) that improves independent zones chromatic image calibration apparatus, compared to traditional color signal treatment technology, do not need complicated color space conversion, can reach the purpose of better individual color adjustment quality.

The above only is in order to explain preferred embodiment of the present invention; be not that attempt is done any pro forma restriction to the present invention according to this; therefore, all have in that identical invention spirit is lower do relevant any modification of the present invention or change, all must be included in the scope that the invention is intended to protect.

Claims (6)

1. a correction parameter generation device is mainly used in independent zones chromatic image adjusting device, and described correction parameter generation device comprises:

One independent zones determining means receives an image signal that comes from the outside, and according to a red image component, a green image component and a blue image component in the described image signal, calculates a correcting area address value and output;

The corresponding table of one mapping is connected with described independent zones determining means, receives described correcting area address value, and finds out a correction parameter and the output of corresponding described correcting area address value;

One weights unit receives an aberration signal that comes from the outside and converted to by described image signal, and produces weights; And

One multiplier, corresponding table with described weights unit and described mapping connects, described weights and described correction parameter that reception produces through described weights unit, and described weights and described correction parameter are carried out multiplying, and obtain a correction of a final proof parameter and export.

2. correction parameter generation device according to claim 1, it is characterized in that: described correction parameter comprises at least one in a brightness correction parameter and the form and aspect correction parameter.

3. correction parameter generation device according to claim 1 is characterized in that: described color-difference signal is to include one of them of analogy color-difference signal or numerical digit color-difference signal.

4. correction parameter generation device according to claim 1 is characterized in that: described independent zones determining means determines that the method for described correcting area address value comprises a receiving step, definition step, a difference calculation procedure and a calculation step;

Described receiving step receives described image signal;

Described definition step is a maximum and a minimum value that defines in described red image component, described green image component and the described blue image component;

Described difference calculation procedure is that described maximum is deducted described minimum value and obtains a difference;

Described calculation step calculates described correcting area address value according to described maximum, described minimum value and described difference.

5. correction parameter generation device according to claim 4 is characterized in that: described calculation step is to judge first whether described difference is zero, if described difference is to be zero, determines that then described correcting area address value is zero and output;

If this difference is non-vanishing, judge then whether described red image component is this maximum, if described red image component is this maximum, determine that then described correcting area address value is 60* (G-B)/Δ V, and whether judge described correcting area address value less than zero, when correcting area address value is not less than zero, with described correcting area address value output, if described correcting area address value then adds 360 rear outputs with described correcting area address value less than zero;

If the non-maximum of described red image component, judge then whether described green image component G is maximum, if described green image component G is maximum, determine that then described correcting area address value is 120+60* (B-R)/Δ V, and whether judge described correcting area address value less than zero, when described correcting area address value is not less than zero, with described correcting area address value output, if described correcting area address value then adds 360 rear outputs with described correcting area address value less than zero;

If described green image component is not described maximum, determine that then described correcting area address value is 240+60* (R-G)/Δ V, and judge that whether described correcting area address value is less than zero, when described correcting area address value is not less than zero, with described correcting area address value output, if described correcting area address value then adds 360 rear outputs with described correcting area address value less than zero;

Wherein, R is that described red image component, G are that described green image component, B are that described blue image component, Δ V are described difference.

6. correction parameter generation device according to claim 1 is characterized in that: the weights output area that described weights unit produces is 0～1.