CN106657960A - Color space conversion method - Google Patents
Color space conversion method Download PDFInfo
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- CN106657960A CN106657960A CN201610874941.7A CN201610874941A CN106657960A CN 106657960 A CN106657960 A CN 106657960A CN 201610874941 A CN201610874941 A CN 201610874941A CN 106657960 A CN106657960 A CN 106657960A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
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Abstract
The invention relates to a color space conversion method. The color space conversion method is suitable for converting a first component, a second component and a third component of a first color space into a fourth component, a fifth component and a sixth component of a second color space. The color space conversion method comprises the following steps that: (a) nine new coefficients and three new parameters which are dyadic rationals are selected; (b) the new fourth component, the new fifth component and the new sixth component are obtained according to the first component, the second component, the third component, the nine new coefficients and the three new parameters; and (c) the nine new coefficients and the three new parameters are simplified through reduction of fractions to a common denominator, so that a logic circuit unit can calculate the new fourth component, the new fifth component and the new sixth component by using a plurality of adders and a plurality of selectors without using a multiplier.
Description
Technical field
The invention relates to a kind of color space changover method, particularly relates to one kind and applies in drive integrated circult
(Driver IC) touch-control integrated circuit (Touch IC) can save chip area with the calculation time and in three primary colors (RGB) color
Space and component aberration (YCbCr) color space make between the two the color space changover method changed.
Prior art
Traditionally, when dealing with to image, meeting first will be in R values, the G of three primary colors (RGB) color space (Domain)
Value and B values are first converted into remaking computing in the Y value of component aberration (YCbCr) color space, Cb values and Cr values.Treat that computing is completed
Afterwards, then by the new Y value after the computing of component aberration (YCbCr) color space institute, new Cb values and new Cr values convert back in three primary colors
(RGB) the new R values of color space, new G values and new B values.
R values, G values and B values are converted into the relational expression of Y value, Cb values and Cr values respectively such as formula (1), public affairs by prior art
Shown in formula (2) and formula (3).Wherein, the scope of R values, G values and B values be all integer between 0 to 255 (comprising 0 and
255), the scope of Y value is the integer (comprising 16 and 235) between 16 to 235, and Cb values and Cr values are all between 16 to 240
Between integer (include 16 and 240).
Y value=0.257*R values+0.504*G values+0.098*B values+16... formula (1)
Cb values=- 0.148*R values -0.291*G values+0.439*B values+128... formula (2)
Cr values=0.439*R values -0.368*G values -0.071*B values+128... formula (3)
And prior art by Y value, Cb values and Cr values be converted into the relational expression of R values, G values and B values respectively as formula (4),
Shown in formula (5) and formula (6).Wherein, the scope of R values, G values and B values is also all that integer between 0 to 255 (is included
0 and 255).
R values=1.164*Y values+1.596*Cr values -222.921... formula (4)
G values=1.164*Y values -0.392*Cb values -0.813*Cr values+135.576. formula (5)
B values=1.164*Y values+2.017*Cb values -276.836... formula (6)
From formula (1) to (6), whether will be converted into dividing in the R values of three primary colors color space, G values and B values
Y value, Cb values and the Cr values of aberration color space are measured, or will be in the conversion of the Y value of component colour dyeing color space, Cb values and Cr values
Into the R values in three primary colors color space, G values and B values, when realizing with the hardware of logic circuit, it is required for using multiplier,
And then cause the calculating time of hardware to increase or the shared on the integrated area of hardware becomes big, and become one it is to be solved
Problem.
The content of the invention
Therefore, the purpose of the present invention, that is, providing a kind of color space conversion side for saving chip area and calculation time
Method.
Then, color space changover method of the present invention, it is adaptable to by the first component of the first color space, second component,
And three-component is converted into the 4th component, the 5th component and the 6th component of the second color space.Define the 4th component to be equal to
First component, second component and three-component are multiplied by respectively the first coefficient, the second coefficient and the 3rd coefficient and the first parameter
Summation.Define the 5th component equal to the first component, second component and three-component be multiplied by respectively the 4th coefficient, the 5th coefficient,
And the 6th coefficient and the second parameter summation.The 6th component is defined equal to the first component, second component and three-component difference
It is multiplied by the summation of the 7th coefficient, the 8th coefficient and the 9th coefficient and the 3rd parameter.The color space changover method is patrolled by one
Collect circuit unit to implement, and comprising step (a)～(c).
(a) select respectively the first coefficient, the second coefficient, the 3rd coefficient, the 4th coefficient, the 5th coefficient, the 6th coefficient, the 7th
It is new first coefficient of coefficient, the 8th coefficient, the 9th coefficient, the first parameter, the second parameter and the 3rd parameter, new second coefficient, new
It is 3rd coefficient, new 4th coefficient, new 5th coefficient, new 6th coefficient, new 7th coefficient, new 8th coefficient, new 9th coefficient, new
First parameter, new second parameter and new 3rd parameter, wherein, new first coefficient is to new 9th coefficient, and new first ginseng
The absolute value of number to new 3rd parameter and the difference of its initial value is less than 0.005, and new first coefficient is to new 9th coefficient, and
New first parameter to new 3rd parameter is a kind of dyadic rational.
B () obtains new 4th component, new 5th component and new 6th component.New 4th component be equal to the first component, the
It is total with new first parameter that two components and three-component are multiplied by respectively new first coefficient, new second coefficient and New-regionalism architecture number
With.New 5th component equal to the first component, second component and three-component be multiplied by respectively new 4th coefficient, new 5th coefficient,
And the summation of new 6th coefficient and new second parameter.New 6th component is equal to the first component, second component and three-component point
It is not multiplied by the summation of new 7th coefficient, new 8th coefficient and new 9th coefficient and new 3rd parameter.
C () is by new first coefficient to New-regionalism architecture number and new first parameter, new 4th coefficient to new 6th coefficient and new
Two parameters and new 7th coefficient distinguish reduction of fractions to a common denominator abbreviation to new 9th coefficient with new 3rd parameter so that the logic circuit unit makes
With multiple adders and multiple selectors, and do not use multiplier and calculate new 4th component, new 5th component and new 6th point
Amount.
In certain embodiments, the first color space is three primary colors (RGB) color space, and the first component is to the three-component
Respectively R values, G values and B values.Second color space is component aberration (YCbCr) color space, and the 4th component is to the 6th component
Respectively Y value, Cb values and Cr values.First coefficient to the 9th coefficient is respectively 0.257,0.504,0.098, -0.148, -
0.291st, 0.439,0.439, -0.368 and -0.071, the first parameter to the 3rd parameter is respectively 16,128 and 128.Wherein,
In step (a), new first coefficient to new 9th coefficient is respectively 0.2578125,0.5,0.09375, -0.1484375, -
0.2890625th, 0.4375,0.4375, -0.3671875 and -0.0703125, new first parameter to new 3rd parameter is respectively
16th, 128 and 128.
In certain embodiments, wherein, in step (c), define new 4th component, new 5th component and new 6th point
Amount is respectively new Y value, new Cb values and new Cr values,
New Y value=(R values<<5+R values+G is worth<<6+B values<<3+B values<<2)>>7+16,
New Cb values=(B values<<6-B values<<3-G values<<5-G values<<2-G values-R is worth<<4-R values<<1-R values)>>7+128,
New Cr values=(R values<<6-R values<<3-G values<<6+G values<<4+G values-B is worth<<3-B values)>>7+128.
In certain embodiments, the first component to three-component scope between 0 to 255, the scope of the 4th component
Between 16 to 235, the scope of the 5th component and the 6th component is between 16 to 240.Wherein, in step (b) and (c)
In, the scope of new 4th component between 16 to 235, the scope of new 5th component and new 6th component between 16 to 240 it
Between.
In further embodiments, the first color space be component aberration (YCbCr) color space, the first component to the 3rd
Component is respectively Y value, Cb values and Cr values.Second color space is three primary colors (RGB) color space, and the 4th component is to the 6th point
Amount is respectively R values, G values and B values.First coefficient to the 9th coefficient is respectively 1.164,0,1.596,1.164, -0.392, -
0.813rd, 1.164,2.017 and 0, the first parameter to the 3rd parameter is respectively -222.921,135.576 and -276.836.Its
In, in step (a), new first coefficient to new 9th coefficient is respectively 1.1640625,0,1.59375,1.1640625 ,-
0.390625th, -0.8125,1.1640625,2.015625 and 0, new first parameter to new 3rd parameter be respectively -
222.921875th, 135.578125 and -276.8359375.
In certain embodiments, wherein, in step (c), define new 4th component, new 5th component and new 6th point
Amount is respectively new R values, new G values and new B values,
New R values=Y value+(Y value<<4+Y values<<2+Y values)>>7+Cr value -222+ (Cr values<<6+Cr values<<3+Cr values<<2-118)>
>7,
New G values=Y value+(Y value<<4+Y values<<2+Y values)>>7+135- (Cb values<<5+Cb values<<4+Cb values<<2+Cr values<<6+Cr
Value<<5+Cr values<<3)>>7,
New B values=Y value+(Y value<<4+Y values<<2+Y values)>>7+Cb values<<1+ (Cb values<<1-107)>>7-276.
In certain embodiments, the scope of the first component is between 16 to 235, second component and three-component scope
Between 16 to 240, the scope of the 4th component to the 6th component is between 0 to 255.Wherein, in step (b) and (c),
The scope of new 4th component to new 6th component is between 0 to 255.
The present invention at least has following effect：It is to the new 9th by new first coefficient for selecting to belong to dyadic rational
Number, and new first parameter is to new 3rd parameter, to obtain new 4th component to new 6th component, and by by new first coefficient extremely
New 9th coefficient distinguishes reduction of fractions to a common denominator abbreviation with new first parameter to new 3rd parameter respectively so that logic circuit unit is added using multiple
Musical instruments used in a Buddhist or Taoist mass and multiple selectors, and do not use multiplier and calculate new 4th component to new 6th component, to save logic circuit list
The hardware usable floor area of unit and calculation time.
Description of the drawings
Other features and effect of the present invention, will clearly be presented in the embodiment with reference to schema, wherein：
Fig. 1 is a flow chart, the step of illustrate one embodiment of color space changover method of the present invention；
Fig. 2 is a circuit diagram, illustrates the computing circuit of the new Y value of embodiment；
Fig. 3 is a circuit diagram, illustrates the computing circuit of the new Cb values of embodiment；And
Fig. 4 is a circuit diagram, illustrates the computing circuit of the new Cr values of embodiment.
Reference numeral explanation
S1～S3 ... steps
R[7:0] ... R values
G[7:0] ... G values
B[7:0] ... B values
The new Y values of Y ...
The new Cb values of Cb ...
The new Cr values of Cr ...
Y_tmp[15:0] ... median
Cb_tmp[15:0] ... median
Cr_tmp[15:0] ... median
51～55 ... adders
61～65 ... adders
71～79 ... buffers
81～84 ... adders
91～93 ... registers
R[7:0], 5'b0 ... R values<<5 computing
R[7:0], 4'b0 ... R values<<4 computing
R[7:0], 1'b0 ... R values<<1 computing
G[7:0], 6'b0 ... G values<<6 computing
G[7:0], 2'b0 ... G values<<2 computing
G[7:0], 5'b0 ... G values<<5 computing
B[7:0], 2'b0 ... B values<<2 computing
B[7:0], 3'b0 ... B values<<3 computing
B[7:0], 6'b0 ... B values<<6 computing
8'd16 ... does add operation with 16
8'd128 ... does add operation with 128
Specific embodiment
Before the present invention is described in detail, it shall be noted that in the following description content, similar component is with identical
Numbering representing.
Refering to Fig. 1, one embodiment of color space changover method of the present invention, it is adaptable to by the first of the first color space
Component, second component and three-component are converted into the 4th component, the 5th component and the 6th component of the second color space.Definition
4th component is multiplied by respectively the first coefficient, the second coefficient and the 3rd coefficient equal to the first component, second component and three-component
With the summation of the first parameter.Define the 5th component and be multiplied by the 4th respectively equal to the first component, second component and three-component and be
The summation of number, the 5th coefficient and the 6th coefficient and the second parameter.The 6th component is defined equal to the first component, second component and the
Three-component is multiplied by respectively the summation of the 7th coefficient, the 8th coefficient and the 9th coefficient and the 3rd parameter.
More specifically, when the first color space is three primary colors (RGB) color space, and the second color space is component colour
During difference (YCbCr) color space, the first component to three-component is respectively R values, G values and B values, and the 4th component to the 6th point
Amount is respectively Y value, Cb values and Cr values.First coefficient to the 9th coefficient is respectively 0.257,0.504,0.098, -0.148, -
0.291st, 0.439,0.439, -0.368 and -0.071, the first parameter to the 3rd parameter is respectively 16,128 and 128, its relation
Formula respectively such as following formula (1)～(3), wherein, the first component to three-component, i.e., the scope of R values, G values and B values is between 0
To between 255, the scope of the 4th component, i.e. Y value between 16 to 235, the 5th component and the 6th component, i.e. Cb values and Cr values
Scope between 16 to 240.
Y value=0.257*R values+0.504*G values+0.098*B values+16... formula (1)
Cb values=- 0.148*R values -0.291*G values+0.439*B values+128... formula (2)
Cr values=0.439*R values -0.368*G values -0.071*B values+128... formula (3)
Conversely, when the first color space is component aberration (YCbCr) color space, and the second color space is three primary colors
(RGB) during color space, the first component to three-component is respectively Y value, Cb values and Cr values, and the 4th component to the 6th component
Respectively R values, G values and B values.First coefficient to the 9th coefficient is respectively 1.164,0,1.596,1.164, -0.392, -
0.813rd, 1.164,2.017 and 0, the first parameter to the 3rd parameter is respectively -222.921,135.576 and -276.836, its
Relational expression respectively such as following formula (4)～(6), wherein, the scope of the first component, i.e. Y value between 16 to 235, second
Component and three-component, the i.e. scope of Cb values and Cr values between 16 to 240, the 4th component to the 6th component, i.e. R values, G
The scope of value and B values is between 0 to 255.In addition, what is especially remarked additionally is：In the present embodiment, formula (4)～
(6) last term coefficient is respectively -222.921,135.576 and -276.836, and in other embodiments, due to calculating
During retain the difference of decimal number of words, last term coefficients of formula (4)～(6) can also be respectively -222.912,
135.488 and -276.928, it is not subject to the limits.
R values=1.164*Y values+1.596*Cr values -222.921... formula (4)
G values=1.164*Y values -0.392*Cb values -0.813*Cr values+135.576. formula (5)
B values=1.164*Y values+2.017*Cb values -276.836... formula (6)
Color space changover method is implemented by logic circuit unit, and comprising S1～S3.
In step S1, the first coefficient, the second coefficient, the 3rd coefficient, the 4th coefficient, the 5th coefficient, the 6th is selected to be respectively
Number, new first coefficient of the 7th coefficient, the 8th coefficient, the 9th coefficient, the first parameter, the second parameter and the 3rd parameter, new second
Coefficient, New-regionalism architecture number, new 4th coefficient, new 5th coefficient, new 6th coefficient, new 7th coefficient, new 8th coefficient, the new 9th
Coefficient, new first parameter, new second parameter and new 3rd parameter.Wherein, new first coefficient is to new 9th coefficient, and is somebody's turn to do
The absolute value of new first parameter to new 3rd parameter and the difference of its initial value is less than 0.005, and new first coefficient is to the new 9th
Coefficient, and new first parameter is a kind of dyadic rational to new 3rd parameter.In more detail, dyadic rational refers to one ten
The numerical value of system is can be equal to a/2 during binary representationb, wherein, a is integer, and b is natural number.
More specifically, when the first color space is three primary colors (RGB) color space, and the second color space is component colour
During difference (YCbCr) color space, new first coefficient to new 9th coefficient is respectively 0.2578125,0.5,0.09375 ,-
0.1484375th, -0.2890625,0.4375,0.4375, -0.3671875 and -0.0703125, new first parameter to the new 3rd
Parameter is respectively 16,128 and 128.
Conversely, when the first color space is component aberration (YCbCr) color space, and the second color space is three primary colors
(RGB) during color space, new first coefficient to new 9th coefficient is respectively 1.1640625,0,1.59375,1.1640625 ,-
0.390625th, -0.8125,1.1640625,2.015625 and 0, new first parameter to new 3rd parameter be respectively -
222.921875th, 135.578125 and -276.8359375.
In step S2, new 4th component, new 5th component and new 6th component are obtained.New 4th component is equal to first point
Amount, second component and three-component are multiplied by respectively new first coefficient, new second coefficient and New-regionalism architecture number and new first parameter
Summation.New 5th component is multiplied by respectively new 4th coefficient, the new 5th is equal to the first component, second component and three-component
The summation of number and new 6th coefficient and new second parameter.New 6th component is equal to the first component, second component and three-component
The summation of new 7th coefficient, new 8th coefficient and new 9th coefficient and new 3rd parameter is multiplied by respectively.
More specifically, when the first color space is three primary colors (RGB) color space, and the second color space is component colour
During difference (YCbCr) color space, define new 4th component to new 6th component and be respectively new Y value, new Cb values and new Cr values, its
Relational expression respectively such as following formula (7)～(9), wherein, the scope of new 4th component between 16 to 235, new 5th point
The scope of amount and new 6th component is between 16 to 240.
New Y value=0.2578125*R values+0.5*G value+0.09375*B are worth+16. formula (7)
New Cb values=- 0.1484375*R values -0.2890625*G values+0.4375*B values+128... formula (8)
New Cr values=0.4375*R values -0.3671875*G values -0.0703125*B values+128... formula (9)
Conversely, when the first color space is component aberration (YCbCr) color space, and the second color space is three primary colors
(RGB) during color space, define new 4th component to new 6th component and be respectively new R values, new G values and new B values, its relational expression
Respectively such as following formula (10)～(12), wherein, the scope of new 4th component to new 6th component is between 0 to 255.
New R values=1.1640625*Y values+1.59375*Cr values -222.921875...... formula (10)
New G values=1.1640625*Y values -0.390625*Cb values -0.8125*Cr values+135.578125... formula (11)
New B values=1.1640625*Y values+2.015625*Cb values -276.8359375... formula (12)
In step S3, by new first coefficient to New-regionalism architecture number with new first parameter, new 4th coefficient to new 6th coefficient
Distinguish reduction of fractions to a common denominator abbreviation with new 3rd parameter to new 9th coefficient with new second parameter and new 7th coefficient so that logic circuit list
Unit is not used multiplier and is calculated new 4th component, new 5th component and new the using multiple adders and multiple selectors
Six components.
More specifically, when the first color space is three primary colors (RGB) color space, and the second color space is component colour
During difference (YCbCr) color space, following reduction of fractions to a common denominator abbreviation is made respectively in formula (7)～(9), to obtain formula (13)～(15).Its
In, ">>" represent and make shift operation, such as>>2 is 2 positions of right shift, similarly, "<<" it is also that shift operation is made in expression, such as<<
3 is 3 positions of shifted left.
New Y value=0.2578125*R values+0.5*G value+0.09375*B are worth+16. formula (7)
=(33/128*R values)+(64/128*G values)+(12/128*B values)+16
=(33*R values+64*G value+12*B values)/128+16
=(32*R values+R value+64*G value+8*B value+4*B values)/128+16
=(R values<<5+R values+G is worth<<6+B values<<3+B values<<2)>>7+16...... formula (13)
New Cb values=- 0.1484375*R values -0.2890625*G values+0.4375*B values+128... formula (8)
=-(19/128*R value)-(37/128*G values)+(56/128*B values)+128
=(56*B values -37*G value -19*R values)/128+128
=(32*B values+16*B value+8*B value -32*G value -4*G value-G value -16*R value -2*R value-R values)/128+128
=(B values<<5+B values<<4+B values<<3-G values<<5-G values<<2-G values-R is worth<<4-R values<<1-R values)>>7+128
=(B values<<6-B values<<3-G values<<5-G values<<2-G values-R is worth<<4-R values<<1-R values)>>7+128... formula (14)
New Cr values=0.4375*R values -0.3671875*G values -0.0703125*B values+128... formula (9)
=(56/128*R values)-(47/128*G values)-(9/128*B values)+128
=(56*R values -47*G value -9*B values)/128+128
=(32*R values+16*R value+8*R value -32*G value -8*G value -4*G value -2*G value-G value -8*B value-B values)/128+128
=(R values<<5+R values<<4+R values<<3-G values<<5-G values<<3-G values<<2-G values<<1-G values-B is worth<<3-B values)>>7+
128
=(R values<<6-R values<<3-G values<<6+G values<<4+G values-B is worth<<3-B values)>>7+128... formula (15)
Referring again to Fig. 2, Fig. 2 is a circuit diagram, with the R values of 8, G values and B values, exemplarily illustrates embodiment
How the formula (13) of new Y value is realized by the computing circuit of hardware.Buffer 71 receives R values (R [7:0] after), first is produced
Output valve, i.e. R [7:, and the second output valve, i.e. R [7 0]:0], 5'b0, to adder (Full Adder；FA) 81 it is added, its
In, R [7:0], 5'b0 is exactly to make R values<<5 computing.Buffer 72 receives G values (G [7:0] after), the 3rd output valve, i.e. G are produced
[7:0], 6'b0, exactly makees G values<<6 computing, and export to adder 83.Buffer 73 receives B values (B [7:0] after), produce
4th output valve, i.e. B [7:0], 3'b0, and the 5th output valve, i.e. B [7:0], 2'b0, is added to adder 82, wherein, B
[7:0], 3'b0 is exactly to make B values<<3 computing, B [7:0], 2'b0 is exactly to make B values<<2 computing.Adder 83 is by buffer 72
The 3rd output valve be added again with the addition result of adder 81,82, produce the 6th output valve, i.e. Y_tmp [15:0], that is,
Make (R values<<5+R values+G is worth<<6+B values<<3+B values<<2) computing.Register 91 receives the 6th output valve and to produce the 7th defeated
Go out value, i.e. Y_tmp [15:7], that is, make (R values<<5+R values+G is worth<<6+B values<<3+B values<<2)>>7 computing.Adder
84 are added the 7th output valve with 8'd16, that is, make (R values<<5+R values+G is worth<<6+B values<<3+B values<<2)>>The fortune of 7+16
Calculate, and then produce new Y value.Similar with the explanation of Fig. 2 referring again to Fig. 3 and Fig. 4, Fig. 3 exemplarily illustrates the Cb values of embodiment
Formula (14) is how by buffer 74～76, adder 61～65 and register 92 realizing.And Fig. 4 is exemplarily illustrated
The formula (15) of the Cr values of embodiment is how by buffer 77～79, adder 51～55 and register 93 realizing.
Conversely, when the first color space is component aberration (YCbCr) color space, and the second color space is three primary colors
(RGB) during color space, following reduction of fractions to a common denominator abbreviation is made respectively in formula (10)～(12), to obtain formula (16)～(18).Wherein,
Define Yt values=Y value+(Y value<<4+Y values<<2+Y values)>>7
New R values=1.1640625*Y values+1.59375*Cr values -222.921875...... formula (10)
=(149/128) * Y values+(204/128) * Cr value -222- (118/128)
=(149*Y values+204*Cr values -118)/128-222
=(128*Y values+16*Y value+4*Y value+Y values+128*Cr value+64*Cr value+8*Cr value+4*Cr values -118)/128-222
=Y value+Cr value -222+ (16*Y value+4*Y value+Y values+64*Cr value+8*Cr value+4*Cr values -118)/128
=Y value+(Y value<<4+Y values<<2+Y values)>>7+Cr value -222+ (Cr values<<6+Cr values<<3+Cr values<<2-118)>>7
=Yt values+Cr is worth -222+ (Cr values<<6+Cr values<<3+Cr values<<2-118)>>7... formula (16)
New G values=1.1640625*Y values -0.390625*Cb values -0.8125*Cr values+135.578125... formula (11)
=(149/128) * Y values-(50/128) * Cb values-(104/128) * Cr value+135+ (74/128)
=(149*Y values -50*Cb value -104*Cr values+74)/128+135
=(128*Y values+16*Y value+4*Y value+Y values -32*Cb value -16*Cb value -2*Cb value -64*Cr value -32*Cr value -8*Cr values
+74)/128+135
=Y value+135+ (16*Y value+4*Y value+Y values -32*Cb value -16*Cb value -2*Cb value -64*Cr value -32*Cr value -8*Cr values
+74)/128
=Y value+135+ (Y values<<4+Y values<<2+Y values-Cb is worth<<5-Cb values<<4-Cb values<<2-Cr values<<6-Cr values<<5-Cr values
<<3)>>7
=Yt value+135- (Cb values<<5+Cb values<<4+Cb values<<2+Cr values<<6+Cr values<<5+Cr values<<3)>>7... formula
(17)
New B values=1.1640625*Y values+2.015625*Cb values -276.8359375... formula (12)
=(149/128) * Y values+(258/128) * Cb value -276- (107/128)
=(149*Y values+258*Cb values -107)/128-276
=(128*Y values+16*Y value+4*Y value+Y values+256*Cb value+2*Cb values -107)/128-276
=Y value+2*Cb values+(16*Y value+4*Y value+Y values+2*Cb values -107)/128-276
=Y value+Cb is worth<<1+ (Y values<<4+Y values<<2+Y values+Cb is worth<<1-107)>>7-276
=Yt values+Cb is worth<<1+ (Cb values<<1-107)>>7-276... formula (18)
Formula (1)～(6) of script are required for making the floating-point operation of multiplication, via color conversion space-wise of the present invention
Formula (13)～(18) for being obtained understand, each formula only comprising "+", "-", ">>" or "<<" four kinds of oeprators, and institute
Have coefficient to be all integer, that is to say, that logic circuit unit only need to make respectively using adder (Adder) and selector "
+ ", "-" with ">>」、「<<" logical operation and integer arithmetic, three primary colors (RGB) color space and component aberration can be realized
(YCbCr) conversion between color space, and completely without using any one multiplier, and then save shared by hardware
Area and calculation time.
Additionally, what is especially remarked additionally is：In the present embodiment, color conversion space-wise of the present invention is to apply driving
When integrated circuit (Driver IC) and touch-control integrated circuit (Touch IC) make sharpness (Sharpness) process, elder generation is needed
To be converted into making in the Y value of component colour dyeing color space, Cb values and Cr values in the R values of three primary colors color space, G values and B values
Computing, then the Y value processed in component colour dyeing color space, Cb values and Cr values are converted into the new of three primary colors color space
One group of R values, G values and B values.And in other embodiments, color conversion space-wise of the present invention can also be applied in any pattern
Image procossing on, it is not subject to the limits to improve the sharpness of image.
In sum, from formula (1)～(6), prior art is in three primary colors (RGB) color space and component aberration
(YCbCr) when color space is changed, it is required for using multiplier to make floating-point operation, and multiplier is in logic circuit unit
It is to increase hardware to calculate the time or cause desired hardware area.However, by color space of the present invention conversion forwarding method institute
Formula (13)～(18) of acquisition, it is only necessary to rgb value is multiplied by with particular factor or YCbCr values shift again the power side of (Shift) 2
Reach as integer arithmetic, also just therefore adder and selection can be used according to formula (13)～(18) by logic circuit unit
Device, and do not use multiplier to realize that color space is changed, to save hardware area and the calculation time of logic circuit unit, therefore really
In fact the purpose of the present invention can be reached.
Only as described above, only embodiments of the invention are all when limiting the scope of present invention enforcement with this
It is the simple equivalence changes and modification made according to scope of the present invention patent and patent specification content, all still belongs to the present invention
In the range of patent covers.
Claims (12)
1. a kind of color space changover method, it is adaptable to by the first component of the first color space, second component and three-component
Be converted into the 4th component, the 5th component and the 6th component of the second color space, define the 4th component equal to the first component,
Second component and three-component are multiplied by respectively the summation of the first coefficient, the second coefficient and the 3rd coefficient and the first parameter, definition
5th component is multiplied by respectively the 4th coefficient, the 5th coefficient and the 6th coefficient equal to the first component, second component and three-component
With the summation of the second parameter, define the 6th component and be multiplied by the 7th respectively equal to the first component, second component and three-component and be
The summation of number, the 8th coefficient and the 9th coefficient and the 3rd parameter, the color space changover method is by logic circuit unit reality
Apply, and comprise the steps of：
A () selects respectively the first coefficient, the second coefficient, the 3rd coefficient, the 4th coefficient, the 5th coefficient, the 6th coefficient, the 7th to be
Number, the first new coefficient of the 8th coefficient, the 9th coefficient, the first parameter, the second parameter and the 3rd parameter, the second new coefficient,
The 3rd coefficient newly, the 4th new coefficient, the 5th new coefficient, the 6th new coefficient, the 7th new coefficient, the new the 8th are
Several, new the 9th coefficient, the first new parameter, the second new parameter and the 3rd new parameter.And the first new coefficient is new to this
The 9th coefficient, and the first new parameter is binary system rational to the 3rd new parameter；
B () obtains new the 4th component, the 5th new component and the 6th new component, the 4th new component be equal to this first
Component, the second component and the three-component be multiplied by respectively the first new coefficient, the second new coefficient and this new
The summation of three coefficients and the first new parameter, the 5th new component is equal to first component, the second component and the 3rd
Component is multiplied by respectively the 4th new coefficient, the 5th new coefficient and the 6th new coefficient and the second new parameter
Summation, the 6th new component is equal to first component, the second component and the three-component and is multiplied by this respectively and the new 7th is
Number, the 8th new coefficient and the 9th new coefficient and the 3rd new parameter it is total
With；And
C () is new to this with the first new parameter, the 4th new coefficient to the 3rd new coefficient by the first new coefficient
The 6th coefficient and the second new parameter and the 7th new coefficient to the 9th new coefficient and the 3rd new parameter point
Other reduction of fractions to a common denominator abbreviation so that the logic circuit unit is not used multiplier and calculated using multiple adders and multiple selectors
The 4th new component, the 5th new component and the 6th new component.
2. color space changover method as claimed in claim 1, the first new coefficient, and should to the 9th new coefficient
The absolute value of the first new parameter to the 3rd new parameter and the difference of its initial value is less than 0.005.
3. color space changover method as claimed in claim 2, first color space is three primary colors (RGB) color space,
First component is respectively R values, G values and B values to the three-component, and second color space is component aberration (YCbCr) color
Space, the 4th component is respectively Y value, Cb values and Cr values to the 6th component.
4. color space changover method as claimed in claim 3, the first coefficient to the 9th coefficient is respectively 0.257,
0.504th, 0.098, -0.148, -0.291,0.439,0.439, -0.368 and -0.071, first parameter is to the 3rd parameter
Respectively 16,128 and 128, wherein, in step (a), the first new coefficient to the 9th new coefficient is respectively
0.2578125th, 0.5,0.09375, -0.1484375, -0.2890625,0.4375,0.4375, -0.3671875 and -
0.0703125, the first new parameter to the 3rd new parameter is respectively 16,128 and 128.
5. color space changover method as claimed in claim 4, wherein, in step (c), define the 4th new component, should
New the 5th component and the 6th new component is respectively new Y value, new Cb values and new Cr values,
New Y value=(R values<<5+R values+G is worth<<6+B values<<3+B values<<2)>>7+16,
New Cb values=(B values<<6-B values<<3-G values<<5-G values<<2-G values-R is worth<<4-R values<<1-R values)>>7+128,
New Cr values=(R values<<6-R values<<3-G values<<6+G values<<4+G values-B is worth<<3-B values)>>7+128.
6. color space changover method as claimed in claim 5, first component to the three-component scope between 0 to
Between 255, the scope of the 4th component between 16 to 235, the scope of the 5th component and the 6th component between 16 to
Between 240, wherein, in step (b) and (c), between 16 to 235, this new 5th for the scope of the 4th new component
The scope of component and the 6th new component is between 16 to 240.
7. color space changover method as claimed in claim 6, the first color space is that component aberration (YCbCr) color is empty
Between, the first component to three-component is respectively Y value, Cb values and Cr values, and the second color space is three primary colors (RGB) color space,
4th component is respectively R values, G values and B values to the 6th component.
8. color space changover method as claimed in claim 7, first coefficient to the 9th coefficient is respectively 1.164,0,
1.596th, 1.164, -0.392, -0.813,1.164,2.017 and 0, the first parameter to the 3rd parameter respectively -222.921,
135.576 and -276.836, wherein, in step (a), the first new coefficient is respectively to the 9th new coefficient
1.1640625th, 0,1.59375,1.1640625, -0.390625, -0.8125,1.1640625,2.015625 and 0, it is described new
The first parameter to the 3rd new parameter be respectively -222.921875,135.578125 and -276.8359375.
9. color space changover method as claimed in claim 8, wherein, in step (c), define the 4th new component,
The 5th new component and the 6th new component are respectively new R values, new G values and new B values,
New R values=Y value+(Y value<<4+Y values<<2+Y values)>>7+Cr value -222+ (Cr values<<6+Cr values<<3+Cr values<<2-
118)>>7,
New G values=Y value+(Y value<<4+Y values<<2+Y values)>>7+135- (Cb values<<5+Cb values<<4+Cb values<<2+Cr values<<6+
Cr values<<5+Cr values<<3)>>7,
New B values=Y value+(Y value<<4+Y values<<2+Y values)>>7+Cb values<<1+ (Cb values<<1-107)>>7-276.
10. color space changover method as claimed in claim 9, the scope of the first component between 16 to 235, second point
Amount and three-component scope between 16 to 240, the scope of the 4th component to the 6th component between 0 to 255, its
In, in step (b) and (c), the scope of new the 4th component to the 6th new component is between 0 to 255.
11. a kind of color space conversion apparatus, using the method as described in claim 1～10 any one, described device bag
Include：
Adder, for the add operation in color space transfer process；
Selector, for the shift operation in color space transfer process.
12. color space conversion apparatus as claimed in claim 11, also include
Buffer, for receiving the data of three primary colors color space and producing output valve；And
Register, for receiving color space transfer process in data and produce output valve.
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