IMAGE PROCESSING METHOD, IMAGE DATA CONVERSION METHOD AND DEVICE THEREOF

• US 20090160871A1
• Filed: 12/19/2008
• Published: 06/25/2009
• Est. Priority Date: 12/21/2007
• Status: Abandoned Application

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: Hsu, Ching-Fu, Li, Jyun-Sian, Weng, Ruey-Shing, Lai, Chih-Chang
• Application Number:
  US12/339,168
• Publication Number:
  US 20090160871A1
• Time in Patent Office: Days
• US Class Current: 345/589
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607

Abstract

An image data conversion method is provided. The method comprises the following steps of (a) receiving an original image data having three basic-color sub-pixel data and (b) calculating at least one color-enhancing sub-pixel data according to any two basic-color sub-pixel data so as to convert the original image data into an image data having at least three basic-color sub-pixel data and one color-enhancing sub-pixel data. The calculation of the color-enhancing sub-pixel data is represented as:

$J_i=\left[\mathrm{var}.-\left(\frac{D_i-E_i}{S}\right)\right]\times \mathrm{Max}\left(D_i,E_i\right)$

• • wherein
    • 0.8<var.<1.2,
    • D_i, E_i: two basic-color sub-pixel data
    • S: the maximal grey level

Claims

1. An image data conversion method, comprising:

receiving an original image data having three basic-color sub-pixel data;

calculating at least one color-enhancing sub-pixel data according to any two basic-color sub-pixel data so as to convert the original image data into an image data having at least the three basic-color sub-pixel data and the color-enhancing sub-pixel data, wherein the calculation of the color-enhancing sub-pixel data is represented as;

$\begin{array}{cc}{J}_i=\left[\mathrm{var}.-\left(\frac{<br><br>D_i-E_i<br><br>}{S}\right)\right]\times <br><br>\mathrm{Max}<br><br>\left(D_i,E_i\right);<br><br>& \left(1\right)\end{array}$

wherein var.=0.8˜

1.2, D_i and E_i denote two basic-color sub-pixel data, and S is the maximal grey level of the image data.

2. The method according to claim 1, wherein the three basic-color sub-pixels respectively are red sub-pixel, green sub-pixel and blue sub-pixel.

3. The method according to claim 1, wherein the color of the color-enhancing sub-pixel is a mixed color of any two of the three primal colors, the three primal colors being red (R), green (G), and blue (B).

4. The method according to claim 1, wherein when the color of the color-enhancing sub-pixel is yellow, D_i and E_i respectively denote red sub-pixel data and green sub-pixel data;

when the color of the color-enhancing sub-pixel is cyan, D_i and E_i respectively denote green sub-pixel data and blue sub-pixel data;

when the color of the color-enhancing sub-pixel is magenta, D_i and E_i respectively denote red sub-pixel data and blue sub-pixel data.

5. The method according to claim 1, wherein the three basic-color sub-pixels respectively are cyan (C) sub-pixel, magenta (M) sub-pixel, and yellow (Y) sub-pixel.

6. The method according to claim 1 further comprising:

forming a display pixel array by three basic-color sub-pixels and at least one color-enhancing sub-pixel, any three of the four sub-pixels constituting a selected pixel, wherein the converted image data comprises a first value belonging to the sub-pixel color of the selected pixel and a second value not belonging to the sub-pixel color of the selected pixel;

the selected pixel receiving a third value inputted from the at least one neighboring selected pixel, wherein the third value does not belong to the sub-pixel color of the neighboring selected pixel but belongs to the sub-pixel color of the selected pixel;

using the minimal value of the first value and the third value as the data value of the sub-pixel color outputted from the selected pixel when the sub-pixel color corresponding to the third value is identical to the sub-pixel color corresponding to the first value; and

using the first value as the data value of the remaining sub-pixel color outputted from the selected pixel.

7. The method according to claim 1 further comprising:

using the minimal value of the three basic-color sub-pixel data as another color-enhancing sub-pixel data, and adjusting the three basic-color sub-pixel data according to the another color-enhancing sub-pixel data, wherein the adjusted values of the three basic-color sub-pixel data respectively are;

$D_i^{\mathrm{\prime <br><br>}}=D_i\times <br><br>m-K_i$ $E_i^{\mathrm{\prime <br><br>}}=E_i\times <br><br>m-K_i$ $F_i^{\mathrm{\prime <br><br>}}=F_i\times <br><br>m-K_i,<br><br>\mathrm{wherein}<br><br><br><br>m=1+\frac{\mathrm{Max}<br><br>\left(D_i,E_i,F_i\right)}{\mathrm{Min}<br><br>\left(D_i,E_i,F_i\right)};<br><br>$

K_i denotes the another color-enhancing sub-pixel data; and

D_i, E_i, and F_i respectively denote the three basic-color sub-pixel data.

8. The method according to claim 7, wherein the color of the another color-enhancing sub-pixel is white.

9. The method according to claim 7, wherein the method further comprises:

forming a display pixel array by the three basic-color sub-pixels and at least two color-enhancing sub-pixel, any three of the five sub-pixels constituting a selected pixel, wherein the adjusted three basic-color sub-pixel data and the two color-enhancing sub-pixel data comprise a first value belonging to the sub-pixel color of the selected pixel and a second value not belonging to the sub-pixel color of the selected pixel;

the selected pixel receiving a third value inputted from the at least one neighboring selected pixel, wherein the third value does not belong to the neighboring sub-pixel color of the neighboring selected pixel but belongs to the sub-pixel color of the selected pixel;

using the minimal value of the first value and the third value as the data value of the sub-pixel color outputted from the selected pixel when the sub-pixel color corresponding to the third value is identical to the sub-pixel color corresponding to the first value; and

using the first value as the data value of the remaining sub-pixel color outputted from the selected pixel.

10. The method according to claim 7, wherein the neighboring selected pixel is situated next to the selected pixel in the first dimension.

11. An image processing method, comprising:

receiving an original image data having three basic-color sub-pixel data;

calculating at least one color-enhancing sub-pixel data according to any two basic-color sub-pixel data so as to convert the original image data into an image data having at least the three basic-color sub-pixel data and the color-enhancing sub-pixel data, wherein the calculation of the color-enhancing sub-pixel data is represented as;

$\begin{array}{cc}{J}_i=\left[\mathrm{var}.-\left(\frac{<br><br>D_i-E_i<br><br>}{S}\right)\right]\times <br><br>\mathrm{Max}<br><br>\left(D_i,E_i\right);<br><br>& \left(1\right)\end{array}$

wherein var.=0.8˜

1.2, D_i and E_i denote any two basic-color sub-pixel data of the original image data, and S is the maximal grey level of the image data;

forming a display pixel array by three basic-color sub-pixels and at least one color-enhancing sub-pixel, any three of these sub-pixels constituting a selected pixel, wherein the converted image data comprises a first value belonging to the sub-pixel color of the selected pixel and a second value not belonging to the sub-pixel color of the selected pixel;

the selected pixel receiving a third value inputted from the at least one neighboring selected pixel, wherein the third value does not belong to the neighboring sub-pixel color of the neighboring selected pixel but belongs to the sub-pixel color of the selected pixel;

using the minimal value of the first value and the third value as the data value of the sub-pixel color outputted from the selected pixel when the sub-pixel color corresponding to the third value is identical to the sub-pixel color corresponding to the first value; and

using the first value as the data value of the remaining sub-pixel color outputted from the selected pixel.

12. The method according to claim 11, wherein the three basic-color sub-pixels are red sub-pixel, green sub-pixel, and blue sub-pixel, and the color of the color-enhancing sub-pixel is a mixed color of any two of the three primal colors, the three primal colors being red (R), green (G), and blue (B).

13. The method according to claim 11, wherein when the color of the color-enhancing sub-pixel is yellow, D_i and E_i respectively are red sub-pixel data and green sub-pixel data:

when the color of the color-enhancing sub-pixel is cyan, D_i and E_i respectively are green sub-pixel data and blue sub-pixel data;

when the color of the color-enhancing sub-pixel is magenta, D_i and E_i respectively are red sub-pixel data and blue sub-pixel data.

14. The method according to claim 11, wherein the three basic-color sub-pixels are cyan (C), magenta (M), and yellow (Y) sub-pixel.

15. The method according to claim 11 further comprising:

using the minimal value of the three basic-color sub-pixel data as another color-enhancing sub-pixel data, and adjusting the three basic-color sub-pixel data according to the another color-enhancing sub-pixel data, wherein the adjusted values of the three basic-color sub-pixel data respectively are;

$D_i^{\mathrm{\prime <br><br>}}=D_i\times <br><br>m-K_i$ $E_i^{\mathrm{\prime <br><br>}}=E_i\times <br><br>m-K_i$ $F_i^{\mathrm{\prime <br><br>}}=F_i\times <br><br>m-K_i,<br><br>\mathrm{wherein}<br><br><br><br>m=1+\frac{\mathrm{Max}<br><br>\left(D_i,E_i,F_i\right)}{\mathrm{Min}<br><br>\left(D_i,E_i,F_i\right)};<br><br>$

K_i denotes the another color-enhancing sub-pixel data; and

D_i, E_i and F_i respectively denote the three basic-color sub-pixel data.

16. The method according to claim 15, wherein the color of the another color-enhancing sub-pixel is white.

17. The method according to claim 15, wherein the display pixel array is formed by the three basic-color sub-pixels and two color-enhancing sub-pixels, and the selected pixel of the pixel array is formed by any three of the five sub-pixels;

wherein the adjusted three basic-color sub-pixel data and the two color-enhancing sub-pixel data comprise a first value belonging to the sub-pixel color of the selected pixel and a second value not belonging to the sub-pixel color of the selected pixel.

18. An image data conversion device, comprising;

a first subtractor used for receiving the three basic-color sub-pixel data of an original image data and calculating a difference between any two selected basic-color sub-pixel data;

an absolute value extractor used for receiving the difference and taking a absolute value of the difference;

a divider used for receiving the absolute value and dividing the absolute value by the maximal grey level to obtain a quotient;

a second subtractor used for calculating a difference between a variable and the quotient as a parameter, wherein the variable ranges between 0.8˜

1.2;

a maximal value extractor used for obtaining the maximal of the two selected basic-color sub-pixel data;

a multiplier used for multiplying the maximal of the two selected basic-color sub-pixel data by the parameter and using the product as a color-enhancing sub-pixel data.

19. The device according to claim 18, wherein the three basic-color sub-pixels is red (R), green (G), and blue sub-pixel, and the color of the color-enhancing sub-pixel is a mixed color of any two of the three primal colors, the three primal colors being red (R), green (G), and blue (B).

20. The device according to claim 18, wherein the color of the color-enhancing sub-pixel is selected from yellow, cyan and magenta.