CN101626514B - Color saturation adjusting method and image displaying system adopting same - Google Patents
Color saturation adjusting method and image displaying system adopting same Download PDFInfo
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- CN101626514B CN101626514B CN200810137845XA CN200810137845A CN101626514B CN 101626514 B CN101626514 B CN 101626514B CN 200810137845X A CN200810137845X A CN 200810137845XA CN 200810137845 A CN200810137845 A CN 200810137845A CN 101626514 B CN101626514 B CN 101626514B
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Abstract
The invention discloses a color saturation adjusting method and an image displaying system adopting the same. The color saturation adjusting method which can be used for adjusting the color of a pixel in a color space comprises the steps of deciding a color cube in the color space, using one of the plurality of diagonals as a main diagonal, setting the main diagonal on a vertical axis of the color space, deciding a tone azimuth angle and a height needed by the pixel in the color cube, deciding a reference point corresponding to the tone azimuth angle on the outermost periphery of the color cube, obtaining a reference height of the reference point and a reference horizontal distance apart away from the main diagonal and obtaining a color saturation value of the pixel through multiplying the reference horizontal distance and the proportion of the reference height to the height of the pixel.
Description
Technical field
The present invention relates to a kind of colors of image adjustment technology, particularly relate to the color saturation method of adjustment.
Background technology
For the image that will show, the image that shows of TV for example in order to make image more lively (Vivid), can adjust to image according to user's hobby.In multiple adjustment parameter, tone (hue) is two common adjustment parameters with saturation (saturation).When rgb color space is transformed into following time of color space of YUV, pixel is that (coordinate is v) described for y, u, and wherein the saturation of pixel (sat) is the vector length on the UV plane, promptly is with p
The saturation of adjusting pixel changes original pixels
Value.
Fig. 1 illustrates the color space of YUV, corresponding color concern sketch map.Consult Fig. 1, the color data of pixel is generally got with the RGB mode.After space conversion, for example describe with the color space of YUV, it has Y, U, three axles of V.The Y axle is the vertical axis of corresponding brightness, and two axles of U and V constitute the tone horizontal plane.The color space that the color cubes of RGB is transformed into YUV also is a color cubes 100; But its black color dots (black) can be in the direction parallel with the Y axle with a leading diagonal (primarydiagonal) of white point (white); But the black color dots of color cubes 100 is not on the initial point of YUV coordinate; Yet it only is the relation of translation, can simply coordinate moved on the leading diagonal in the geometrical analysis, the convenient analysis and adjustment.
Fig. 2 illustrates the concern sketch map of pixel in the tone of the color space of YUV and saturation.Consult Fig. 2, the leading diagonal of the color cubes 100 of YUV is that stain 102 constitutes with white point 104 lines.Analyze for convenient, leading diagonal can move on the Y axle.(y, u represent that v) under normal color showed, pixel 108 can be in the inside of color cubes 100 to pixel 108 with p at the coordinate of color cubes 100.If pixel 108 exceeds the border of color cubes 100, then can produce the color that closes of satiety, cause problem such as nature of color.
In other words; On the horizontal plane 106 under the fixing y value; When adjustment tone saturation (
), generally do not hope to be beyond the boundary.Horizontal plane 106 crosscut color cubes 100 have the borderline region 106a of unalterable rules not, like the zone on the UV plane among Fig. 2.The footpath coordinate of pixel 108
Can be described as saturation (sat) again.By the orientation angles θ that coordinate u and v are constituted, it produces the effect of tone on the color phenomenon.
Fig. 3 illustrate the tone saturation of adjustment pixel the problem sketch map that can face.Consult Fig. 3, do not change because the regional 106a of color cubes 100 and horizontal plane 106 crosscuts is not a rule, its border can change along with differing heights, just changes along with different y values.Though close the border that analysis can obtain regional 106a by several, need complicated computing.Therefore, when pixel 108 was adjusted to the position of pixel 110 at p ' (y ', u ', v '), the segment distance Doff that might be beyond the boundary caused the supersaturation of color.
In other words, when the adjustment color, the estimation on border is the parameter that will consider, but how obtaining boundary position simply is one of the problem that will consider in the technical research.
Summary of the invention
The present invention provides the color saturation method of adjustment, can obtain the transversal border of color cubes effectively, to be beneficial to the adjustment of tone saturation at least.
The present invention provides the look image display system, can the color saturation method of adjustment be operated in the system, in order to the adjustment color.
The present invention provides a kind of color saturation method of adjustment, can under a color space, do the color adjustment to a pixel, is included in this color space, determines a color cube; Get a plurality of cornerwise one of which of this color cubes,, and set this leading diagonal on a vertical axis of this color space as a leading diagonal; Determine this pixel at a desired tone orientation angles of this color cubes and a height; On an outermost periphery of this color cubes, to should the tone orientation angles determining a reference point, and obtain a reference altitude of this reference point and at a distance of a reference levels distance of this leading diagonal; Obtaining a color intensity value of this pixel, is the ratio according to this height of this reference altitude and this pixel, and it is resulting that this ratio is multiplied by this reference levels distance.
According to an embodiment; In described color saturation method of adjustment; This step that for example obtains this color saturation value of this pixel comprises and obtains one first height and one second height of this pixel at this color cubes, and wherein this first height and this second highly is this pixel apart one first end of this leading diagonal and two distances of one second end respectively.Calculate one first parameter of saturation and one second parameter of saturation; This first parameter of saturation=this first height * this reference levels distance/this reference altitude wherein, this second parameter of saturation=this second height * this reference levels distance/(length of this leading diagonal-this reference altitude).Get a smaller value of this first parameter of saturation and this second parameter of saturation this color saturation value as this pixel.
According to an embodiment, in described color saturation method of adjustment, for example color space is a YUV coordinate space, and this leading diagonal of this color cubes is on a Y axle in this YUV coordinate space.(v) under the mode of expression, y is this height for y, u, and atan (v/u) is this tone orientation angles with p at the coordinate of this pixel.
According to an embodiment, in described color saturation method of adjustment, for example this leading diagonal of this color cubes is the diagonal of a stain to a white point.
According to an embodiment, in described color saturation method of adjustment, for example this color space is resultant to a YUV coordinate space by a RGB coordinate space conversion.
According to an embodiment, in described color saturation method of adjustment, for example this outermost periphery of this color cubes is to be linked to be by continuous six limits of the outermost of this color cubes.
The present invention also provides a kind of color saturation method of adjustment, can under a color space, do the color adjustment to a pixel.This method is included in this color space, determines a color cube.Get a plurality of cornerwise one of which of this color cubes,, and set this leading diagonal on a vertical axis of this color space as a leading diagonal.Determine a tone orientation angles and the height of this pixel at this color cubes.On an outermost periphery of this color cubes, get N reference point corresponding with reference to the tone orientation angles.Each of said reference point is calculated a reference altitude and at a distance of a reference levels distance of this leading diagonal, obtain an angle-data table and by a storage device stores.According to this angle-data table, estimate one of this tone orientation angles that should pixel is estimated that horizontal range estimates highly with one.Obtain a color intensity value of this pixel, be based on a ratio of this estimation height and this height of this pixel, it is resulting that this ratio is multiplied by this estimation horizontal range.
According to an embodiment; In described color saturation method of adjustment; For example this angle-data table also comprises one first regular saturation and one second regular saturation; Calculate gained through following steps: obtain one first height and one second height of this pixel at this color cubes, wherein this first height and this second highly is this pixel apart one first end of this leading diagonal and two distances of one second end respectively; Calculate this first regular saturation and this second regular saturation, wherein this first regular saturation=this estimates that horizontal range/this estimates height, this second regular saturation=this reference levels distance/(length of this leading diagonal-this reference altitude).
According to an embodiment, in described color saturation method of adjustment, this step that for example obtains this color saturation value of this pixel comprises: calculate this first parameter of saturation, this first parameter of saturation=this first height * this first regular saturation; Calculate this second parameter of saturation, this second parameter of saturation=this second height * this second regular saturation; And get a smaller value of this first parameter of saturation and this second parameter of saturation this color saturation value as this pixel.
According to an embodiment, in described color saturation method of adjustment, for example this outermost periphery of this color cubes is to be linked to be by continuous six limits of the outermost of this color cubes.
According to an embodiment; In described color saturation method of adjustment; For example this outermost periphery of this color cubes is to be linked to be by continuous three limits of the outermost of this color cubes; When this tone orientation angles of this pixel is when dropping on continuous three limits of other outermost, obtain this color saturation value of this pixel according to a symmetry relation.
According to an embodiment, in described color saturation method of adjustment, for example this N reference point be even horizontal distribution 0 spend between 180 degree or 0 spend spend to 360 between.
According to an embodiment, in described color saturation method of adjustment, for example this N reference point is to distribute in this outermost periphery equal intervals.
According to an embodiment, in described color saturation method of adjustment, for example this pixel be in the image signal a plurality of pixels one of them.For example this image signal is a television image signal again.
The present invention provides a kind of image display system, comprises a signal processing unit, handles an image signal that receives, and obtains pixel color data of each pixel of an image.One color adjusting unit is done color saturation adjustment to these pixel color data, and wherein this color adjusting unit comprises a circuit of realizing like aforesaid color saturation method of adjustment.One display unit is done demonstration according to adjusted this pixel.
For make above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and is described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the color space of YUV, corresponding color concern sketch map.
Fig. 2 shows the concern sketch map of pixel in the tone of the color space of YUV and saturation.
Fig. 3 show the tone saturation of adjustment pixel the problem sketch map that can face.
Fig. 4 shows according to one embodiment of the invention, calculates the mechanism on cubical border.
Fig. 5 A～5B shows according to the embodiment of the invention, obtains the schematic diagram of mechanism on border.
Fig. 6 shows according to one embodiment of the invention, obtains the method flow sketch map of adjustment back saturation Satnew.
Fig. 7 shows according to the embodiment of the invention, and display system realizes system's block schematic diagram of above-mentioned color adjustment method.
The reference numeral explanation
100: color cubes
102: stain
104: white point
106: horizontal plane
106a: borderline region
108: pixel
110: pixel
112: the outermost periphery
112a, 121b: half periphery
114: triangle
116: orientation angles
S600～S624：
Embodiment
The present invention has provided the color saturation method of adjustment, by the data of some reference points, can effectively obtain the border of color cubes, helps the adjustment of pixel color.Below lift some embodiment and explain, but the present invention is not limited only to the embodiment that lifts.
Fig. 4 shows according to one embodiment of the invention, calculates the mechanism on cubical border.Consult Fig. 4, present embodiment is an example with the color space of YUV, describes the position that how effectively obtains cubical border.Yet; The present invention can peer application need utilize the practical operation of cubical border information to other; Though the mechanism that the present invention lifted can be applied in the color adjustment, the present invention also can extend the adjustment of the practical application parameter that is applied in other, is not confined to the adjustment of color.In other words, the YUV axes of coordinates can be the axes of coordinates of other physical quantitys, need not to be confined to the application of color adjustment.Color only is the representation noun of the physical quantity on using.
Be handled easily, the leading diagonal of color cubes 100 be set on the vertical Y axle of axes of coordinates that the stain that is to say color cubes 100 is (0; 0,0) on the position, white point (white) is (219; 0,0) on the position, wherein supposes the distribution of stain to the intensity gray scale value of white point; Be the Y axle 0 to 219 between, its numerical value is changeable.
The outermost of this cube 100 periphery 112 is that six continuous limits by cube 100 constitute, and wherein three continuous limits constitute half periphery 112a of, and other three continuous limits constitute the periphery 112b of second half, but symmetrical each other.The K of for example yellow (Yellow)
0Point, it is y0 at the Y axle.For the locus of the point on the face in addition that can effectively describe cube 100, can on outermost periphery 112, get 1 Ki, it has an orientation angles 116 on the UV plane.This orientation angles 116 only schematically illustrates, its depend on reference to 0 degree and clockwise or inhour change and decide, for example it 0 to π is to be decided by atan (v/u).Other π can symmetry angle obtain to 2 π.
The Y axle that Ki is ordered is yi, can describe any point of cube 100 on this azimuth by the triangle 114 that stain, Ki point and white point are constituted.Change sentence or say a face of the arc description cube 100 of Ki point and stain, another face of the arc description cube 100 of Ki point and white point.Move when the Ki point is prolonging outermost periphery 112, have the tone orientation angles that corresponds to 0～2 π.
Then, to the Y axle border of regional 106a of the plane institute crosscut of yi, promptly be saturation, can utilize different Ki points to calculate and learn.Therefore, for the plane of yi, the tone orientation angles that corresponds to 0～2 π also can corresponding obtain the position that Ki is ordered.
Then describe saturation how to utilize triangle 114 to calculate on the Y=yi plane, be called the border again or simply.Fig. 5 A, 5B show according to the embodiment of the invention, obtain the schematic diagram of mechanism on border.Consult Fig. 5 A, get the triangle 114 of Fig. 4 and describe for example, the Ki point is (y
i, Sat
i), wherein
It promptly is saturation.The vertical edges of triangle 114 is on the Y axle; Two hypotenuses are on two faces of cube 100, for example are by face of white (white), yellow (yellow), green (green), bluish-green (cyan) four somes formations and the face that is made up of red (red), yellow (yellow), green (green), black (black) four points.When the Y of the pixel that will adjust axle is y ' and less than the situation of yi, by the proportionate relationship of similar triangle, with 3 (a) and (b), (c) constitute triangle with (d), (b), (c) constitute triangle, can release Sat ' and Sat " ' value:
Wherein Sat ' is the right value on hypotenuse.Yet why need calculate Sat ' and Sat " ' reason be based on and utilize simplifying the operation of tabling look-up.At Fig. 5 A is the situation of y ' less than yi, and its available formula (1) obtains Sat ', obtains Sat by formula (2) " incorrect.Consult Fig. 5 B, if y ' is just incorrect by the Sat ' that formula (1) obtains greater than the situation of yi, otherwise the Sat that obtains by formula (2) " be only correct.But can find out that getting smaller value promptly is right value, when simplifying operand, can simply judge right value by lookup table mode.Again, Fig. 5 A and Fig. 5 B figure only is an embodiment.Just generally speaking, it utilizes y ' and the proportionate relationship of yi just can obtain the correct saturation on hypotenuse.
Above-mentioned mechanism is for example got n point at outermost periphery 112 by making tables of data, more for example is the evenly spaced n of 0～2 a π reference point, or at outermost periphery 112 an equally spaced n point, according to desired accuracy, as long as the point of sufficient amount is arranged.In addition, based on the symmetric relation of circumferential perimeter 112a and circumferential perimeter 112b, only store circumferential perimeter 112a or the reference point of 112b gets final product.Calculate saturation Sat for each reference point
1, by the storage unit stores tables of data, for example shown in table one or the table two.Table one is the tables of data with the evenly spaced n of 0～2 a π reference point.Table two is based on the tables of data of simplifying according to symmetric relation in the table one, and it utilizes formula (1), formula (2) can arrive correct intensity value, promptly is the distance of level at a distance of leading diagonal.
Table one
| The angle code name | Sat ' normal value | Sat " normal value |
| 0 | Sat 0/y 0 | Sat 0/(219-y 0) |
| 1 | Sat 1/y 1 | Sat 1/(219-y 1) |
| … | … | … |
| n | Sat n/y n | Sat n/(219-y n) |
Table two
| The angle code name | Sat ' normal value | Sat " normal value |
| 0 | Sat 0/y 0 | Sat 0/(219-y 0) |
| 1 | Sat 1/y 1 | Sat 1/(219-y 1) |
| … | … | … |
| n/2-1 | Sat n/2-1/y n | Sat n/2-1/(219-y n/2-1) |
Fig. 6 illustrates according to one embodiment of the invention, obtains adjustment back saturation Sat
NewThe method flow sketch map.Consult Fig. 6, the pixel p (y that step S600 decision will be adjusted
p, u
p, v
p).Step S602 calculates Sat
pWith tone orientation angles θ
pStep S604 does color adjustment, obtain estimate the saturation Sat that will adjust
NewWith the tone azimuth angle theta
NewAt reality adjustment saturation Sat
NewNeed confirm this saturation Sat before
NewBe not beyond the boundary, cause supersaturation.
Mechanism with table two is example, and whether step S612 determines θ
NewThe scope that between 0～π, belongs to table two.If θ
NewMore than or equal to the angle of n/2, according to symmetric relation, step S614 adjusts θ
New=θ
New-n/2.Step S616 tables look-up, and obtains two saturation normal value S1 (Sat ') and S2 (Sat ").
Step S618 calculates Sat according to formula (1) and formula (2)
B1With Sat
B2Step S620-S624 gets Sat
B1With Sat
B2Smaller value Sat
bStep S606 judges Sat
NewWhether greater than border saturation Sat
bIn step S608, if Sat
NewGreater than border saturation Sat
b, then set Sat
New=Sat
b
The steps flow chart of above method only is an embodiment, but the present invention is not limited only to the mode of being lifted.If the data of tables of data have difference, then account form also can be different.Again and in the mechanism of tabling look-up,, also can utilize interpolation method to try to achieve Sat more accurately for more accurately estimation
b
Fig. 7 shows according to the embodiment of the invention, and display system realizes system's block schematic diagram of above-mentioned color adjustment method.Consult Fig. 7, a kind of image display system for example comprises a signal processing unit 700, handles an image signal (TV signal) that receives, and obtains pixel color data of each pixel of an image.702 pairs of pixel color data of one color adjusting unit are done color saturation adjustment, and wherein color adjusting unit 702 comprises a circuit of realizing like aforesaid color saturation method of adjustment.One display unit 704 is done demonstration according to adjusted pixel.Wherein, color adjusting unit of the present invention for the system that needs constantly the reception image signal like television system, the invention provides a kind of enforceable solution because of having the no supersaturation of computational short cut and color adjustment.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention; Those skilled in the art can do some changes and retouching under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with the application's claim.
Claims (40)
1. a color saturation method of adjustment can be done the color adjustment to a pixel under a color space, and this method comprises:
At this color space, determine a color cube;
Get a plurality of cornerwise one of which of this color cubes,, and set this leading diagonal on a vertical axis of this color space as a leading diagonal;
Determine this pixel at a desired tone orientation angles of this color cubes and a height;
On an outermost periphery of this color cubes, to should the tone orientation angles determining a reference point, and obtain a reference altitude of this reference point and at a distance of a reference levels distance of this leading diagonal; And
Obtaining a color intensity value of this pixel, is the ratio according to this height of this reference altitude and this pixel, and it is resulting that this ratio is multiplied by this reference levels distance.
2. color saturation method of adjustment as claimed in claim 1, this step that wherein obtains this color saturation value of this pixel comprises:
Obtain one first height and one second height of this pixel at this color cubes, wherein this first height and this second highly is this pixel apart one first end of this leading diagonal and two distances of one second end respectively;
Calculate one first parameter of saturation and one second parameter of saturation, wherein
This first parameter of saturation=this first height * this reference levels distance/this reference altitude; And
This second parameter of saturation=this second height * this reference levels distance/(length of this leading diagonal-this reference altitude); And
Get a smaller value of this first parameter of saturation and this second parameter of saturation this color saturation value as this pixel.
3. color saturation method of adjustment as claimed in claim 1, wherein this color space is a YUV coordinate space; This leading diagonal of this color cubes is on a Y axle in this YUV coordinate space; And (v) under the mode of expression, y is this height for y, u, and atan (v/u) is this tone orientation angles with p at the coordinate of this pixel.
4. color saturation method of adjustment as claimed in claim 1, wherein this leading diagonal of this color cubes is the diagonal of a stain to a white point.
5. color saturation method of adjustment as claimed in claim 1, wherein this color space is resultant to a YUV coordinate space by a RGB coordinate space conversion.
6. color saturation method of adjustment as claimed in claim 1, wherein this outermost periphery of this color cubes is to be linked to be by continuous six limits of the outermost of this color cubes.
7. color saturation method of adjustment as claimed in claim 1, wherein this pixel be in the image signal a plurality of pixels one of them.
8. color saturation method of adjustment as claimed in claim 7, wherein this image signal is a television image signal.
9. a color saturation method of adjustment can be done the color adjustment to a pixel under a color space, and this method comprises:
At this color space, determine a color cube;
Get a plurality of cornerwise one of which of this color cubes,, and set this leading diagonal on a vertical axis of this color space as a leading diagonal;
Determine a tone orientation angles and the height of this pixel at this color cubes;
On an outermost periphery of this color cubes, get N reference point corresponding with reference to the tone orientation angles;
Each of said reference point is calculated a reference altitude and at a distance of a reference levels distance of this leading diagonal, obtain an angle-data table and by a storage device stores;
According to this angle-data table, estimate one of this tone orientation angles that should pixel is estimated that horizontal range and estimates highly; And
Obtain a color intensity value of this pixel, be based on a ratio of this estimation height and this height of this pixel, it is resulting that this ratio is multiplied by this estimation horizontal range.
10. color saturation method of adjustment as claimed in claim 9, wherein this angle-data table also comprises one first regular saturation and one second regular saturation, calculates gained through following steps:
Obtain one first height and one second height of this pixel at this color cubes, wherein this first height and this second highly is this pixel apart one first end of this leading diagonal and two distances of one second end respectively;
Calculate this first regular saturation and this second regular saturation, wherein
This first regular saturation=this estimates that horizontal range/this estimates height; And
This second regular saturation=this reference levels distance/(length of this leading diagonal-this reference altitude).
11. color saturation method of adjustment as claimed in claim 10, this step that wherein obtains this color saturation value of this pixel comprises:
Calculate first parameter of saturation, this first parameter of saturation=this first height * this first regular saturation;
Calculate second parameter of saturation, this second parameter of saturation=this second height * this second regular saturation; And
Get a smaller value of this first parameter of saturation and this second parameter of saturation this color saturation value as this pixel.
12. color saturation method of adjustment as claimed in claim 9, wherein this color space is a YUV coordinate space; This leading diagonal of this color cubes is on a Y axle in this YUV coordinate space; And (v) under the mode of expression, y is this height for y, u, and atan (v/u) is this tone orientation angles with p at the coordinate of this pixel.
13. color saturation method of adjustment as claimed in claim 9, wherein this leading diagonal of this color cubes is the diagonal of a stain to a white point.
14. color saturation method of adjustment as claimed in claim 9, wherein this color space is resultant to a YUV coordinate space by a RGB coordinate space conversion.
15. color saturation method of adjustment as claimed in claim 9, wherein this outermost periphery of this color cubes is to be linked to be by continuous six limits of the outermost of this color cubes.
16. color saturation method of adjustment as claimed in claim 9; Wherein this outermost periphery of this color cubes is to be linked to be by continuous three limits of the outermost of this color cubes; When this tone orientation angles of this pixel is when dropping on continuous three limits of other outermost, obtain this color saturation value of this pixel according to a symmetry relation.
17. color saturation method of adjustment as claimed in claim 9, wherein to be even horizontal distribution spend between 180 degree or 0 spend between 360 degree 0 this N reference point.
18. color saturation method of adjustment as claimed in claim 9, wherein this N reference point is to distribute in this outermost periphery equal intervals.
19. color saturation method of adjustment as claimed in claim 9, wherein this pixel be in the image signal a plurality of pixels one of them.
20. color saturation method of adjustment as claimed in claim 19, wherein this image signal is a television image signal.
21. an image display system comprises:
One signal processing unit is handled an image signal that receives, and obtains pixel color data of each pixel of an image;
One color adjusting unit is done color saturation adjustment to these pixel color data, and wherein this color adjusting unit comprises a circuit of realizing a color saturation method of adjustment; And
One display unit is done demonstration according to adjusted this pixel,
Wherein this operated color saturation method of adjustment of this circuit of this color adjusting unit comprises:
At this color space, determine a color cube;
Get a plurality of cornerwise one of which of this color cubes,, and set this leading diagonal on a vertical axis of this color space as a leading diagonal;
Determine this pixel at a desired tone orientation angles of this color cubes and a height;
On an outermost periphery of this color cubes, to should the tone orientation angles determining a reference point, and obtain a reference altitude of this reference point and at a distance of a reference levels distance of this leading diagonal; And
Obtaining a color intensity value of this pixel, is the ratio according to this height of this reference altitude and this pixel, and it is resulting that this ratio is multiplied by this reference levels distance.
22. image display system as claimed in claim 21, this treatment step that wherein obtains this color saturation value of this pixel comprises:
Obtain one first height and one second height of this pixel at this color cubes, wherein this first height and this second highly is this pixel apart one first end of this leading diagonal and two distances of one second end respectively;
Calculate one first parameter of saturation and one second parameter of saturation, wherein
This first parameter of saturation=this first height * this reference levels distance/this reference altitude; And
This second parameter of saturation=this second height * this reference levels distance/(length of this leading diagonal-this reference altitude); And
Get a smaller value of this first parameter of saturation and this second parameter of saturation this color saturation value as this pixel.
23. image display system as claimed in claim 21, wherein this color space is a YUV coordinate space; This leading diagonal of this color cubes is on a Y axle in this YUV coordinate space; And (v) under the mode of expression, y is this height for y, u, and atan (v/u) is this tone orientation angles with p at the coordinate of this pixel.
24. image display system as claimed in claim 21, wherein this leading diagonal of this color cubes is the diagonal of a stain to a white point.
25. image display system as claimed in claim 21, wherein this color space is resultant to a YUV coordinate space by a RGB coordinate space conversion.
26. image display system as claimed in claim 21, wherein this outermost periphery of this color cubes is to be linked to be by continuous six limits of the outermost of this color cubes.
27. image display system as claimed in claim 21, wherein this pixel be in the image signal a plurality of pixels one of them.
28. image display system as claimed in claim 27, wherein this image signal is a television image signal.
29. an image display system comprises:
One signal processing unit is handled an image signal that receives, and obtains pixel color data of each pixel of an image;
One color adjusting unit is done color saturation adjustment to these pixel color data, and wherein this color adjusting unit comprises a circuit of realizing a color saturation method of adjustment; And
One display unit is done demonstration according to adjusted this pixel,
Wherein this operated color saturation method of adjustment of this circuit of this color adjusting unit comprises:
At this color space, determine a color cube;
Get a plurality of cornerwise one of which of this color cubes,, and set this leading diagonal on a vertical axis of this color space as a leading diagonal;
Determine a tone orientation angles and the height of this pixel at this color cubes;
On an outermost periphery of this color cubes, get N reference point corresponding with reference to the tone orientation angles;
Each of said reference point is calculated a reference altitude and at a distance of a reference levels distance of this leading diagonal, obtain an angle-data table and by a storage device stores;
According to this angle-data table, estimate one of this tone orientation angles that should pixel is estimated that horizontal range and estimates highly; And
Obtain a color intensity value of this pixel, be based on a ratio of this estimation height and this height of this pixel, it is resulting that this ratio is multiplied by this estimation horizontal range.
30. image display system as claimed in claim 29, wherein this angle-data table also comprises one first regular saturation and one second regular saturation, calculates gained through following steps:
Obtain one first height and one second height of this pixel at this color cubes, wherein this first height and this second highly is this pixel apart one first end of this leading diagonal and two distances of one second end respectively;
Calculate this first regular saturation and this second regular saturation, wherein
This first regular saturation=this estimates that horizontal range/this estimates height; And
This second regular saturation=this reference levels distance/(length of this leading diagonal-this reference altitude).
31. image display system as claimed in claim 30, this step that wherein obtains this color saturation value of this pixel comprises:
Calculate first parameter of saturation, this first parameter of saturation=this first height * this first regular saturation;
Calculate second parameter of saturation, this second parameter of saturation=this second height * this second regular saturation; And
Get a smaller value of this first parameter of saturation and this second parameter of saturation this color saturation value as this pixel.
32. image display system as claimed in claim 29, wherein this color space is a YUV coordinate space; This leading diagonal of this color cubes is on a Y axle in this YUV coordinate space; And (v) under the mode of expression, y is this height for y, u, and atan (v/u) is this tone orientation angles with p at the coordinate of this pixel.
33. image display system as claimed in claim 29, wherein this leading diagonal of this color cubes is the diagonal of a stain to a white point.
34. image display system as claimed in claim 29, wherein this color space is resultant to a YUV coordinate space by a RGB coordinate space conversion.
35. image display system as claimed in claim 29, wherein this outermost periphery of this color cubes is to be linked to be by continuous six limits of the outermost of this color cubes.
36. image display system as claimed in claim 29; Wherein this outermost periphery of this color cubes is to be linked to be by continuous three limits of the outermost of this color cubes; When this tone orientation angles of this pixel is when dropping on continuous three limits of other outermost, obtain this color saturation value of this pixel according to a symmetry relation.
37. image display system as claimed in claim 29, wherein to be even horizontal distribution spend between 180 degree or 0 spend between 360 degree 0 this N reference point.
38. image display system as claimed in claim 29, wherein this N reference point is to distribute in this outermost periphery equal intervals.
39. image display system as claimed in claim 29, wherein this pixel be in the image signal a plurality of pixels one of them.
40. image display system as claimed in claim 39, wherein this image signal is a television image signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US20080291478A1 (en) * | 2007-05-25 | 2008-11-27 | Takeshi Shibuya | Color conversion apparatus and color conversion method |
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| US20080291478A1 (en) * | 2007-05-25 | 2008-11-27 | Takeshi Shibuya | Color conversion apparatus and color conversion method |
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