Image processing device and image processing method which are capable of displaying white, black and a color other than white and black at each pixel

• US 7,885,457 B2
• Filed: 03/28/2006
• Issued: 02/08/2011
• Est. Priority Date: 08/03/2005
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Machida, Yoshinori, Shigehiro, Kiyoshi, Sakamaki, Motohiko, Hirano, Atsushi, Matsunaga, Takeshi, Suwabe, Yasufumi, Yamaguchi, Yoshiro
• Primary Examiner(s): Mehta; Bhavesh M
• Assistant Examiner(s): Krasnic; Bernard
• Application Number:
  US11/390,389
• Publication Number:
  US 20070031031A1
• Time in Patent Office: 1,778 Days
• Field of Search: 382/162, 382/167, 382/165, 358/2.1, 358/1.9, 358/3.01, 358/518
• US Class Current: 382/162
• 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
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167

Abstract

An image processing device is provided for processing image data in order to display an image at an image display medium which is capable of displaying white, black, and colors at individual pixels, which are structured by pluralities of sub-pixels. The judgment component acquires the image data and judges whether there is a chromatic color or a non-chromatic color at each pixel. When a pixel is judged to be non-chromatic, the selection component selects a pre-specified black-and-white sub-pixel set in accordance with a gray level of the non-chromatic color. When a pixel is judged to be chromatic, the conversion component converts color data to a sub-pixel set of black and the color in accordance with a pre-specified condition. Of results of conversion, the replacement component replaces a pre-specified sub-pixel set of colors, in an individual pixel or in a pre-specified sub-pixel group, with a pre-specified black-and-white sub-pixel set.

Claims

1. An image processing device for displaying image data that is represented by a collection of image elements, the image processing device comprising:

a plurality of pixels corresponding to the collection of image elements, each pixel comprising a plurality of sub-pixels, each sub-pixel comprising white particles, black particles and a colored layer and displaying one of white, black or a color of the colored layer, by moving the white particles and the black particles within the sub-pixel, wherein when the sub-pixel is displaying one of white, black or the color other than white or black, the other colors are not displayed;

a judgment component which, for each element of the image data judges whether the image element is a chromatic color or a non-chromatic color;

a selection component which, when the image element is judged to be non-chromatic by the judgment component, selects a pre-specified black-and-white sub-pixel set for the sub-pixels of the pixel that correspond to the image element in accordance with a gray level of the non-chromatic color of the image element;

a conversion component which, when the image element is judged to be chromatic by the judgment component, converts the sub-pixels of the pixel that correspond to the image element to a sub-pixel set of black and the color other than white and black based on the chromatic color of the image element in accordance with a pre-specified condition;

a replacement component which, within a single pixel or a pre-specified sub-pixel group that results from the image element that is judged to be chromatic by the judgment component and converted to a sub-pixel set of black and the color other than white and black by the conversion component, replaces each incidence of a pre-specified sub-pixel set of colors with a pre-specified black-and-white sub-pixel set, wherein the replacement component replaces a sub-pixel set of {red, green, blue} with a black-and-white sub-pixel set of one of {white, white, white}, {white, white, black}, {white, black, black} and {black, black, black}; and

a reorder component, which reorders the sub-pixel set for the sub-pixels of the pixels corresponding to the image element determined to be either chromatic or non-chromatic such that the surface area ratios of white, black, red, green and blue do not change, wherein processing of each component is performed by a processor.

2. The image processing device of claim 1, wherein each sub-pixel comprises (i) a back substrate including a colored layer and (ii) a transparent front substrate, the white particles and the black particles being enclosed between the back substrate and the front substrate, each sub-pixel displaying one of white, black or the color of the color layer, by moving the white particles and the black particles between the back substrate and the transparent front substrate.

3. An image processing device for displaying image data that is represented by a collection of image elements, the image processing device comprising:

a plurality of pixels corresponding to the collection of image elements, each pixel comprising a plurality of sub-pixels, each sub-pixel comprising white particles, black particles, a red colored layer, a green colored layer and a blue colored layer and displaying one of white, black, red, green or blue, by moving the white particles and the black particles within the sub-pixel, wherein when the sub-pixel is displaying one of white, black, red, green or blue, the other colors are not displayed;

a judgment component which, for each image element of the image data, judges whether the image element is a chromatic color or a non-chromatic color;

a selection component which, when the image element is judged to be non-chromatic by the judgment component, selects a pre-specified black-and-white sub-pixel set for the sub-pixels of the pixel that correspond to the image element, in accordance with a gray level of the non-chromatic color of the image element, which is represented by red, green and blue color data;

a conversion component which, when the image element is judged to be chromatic by the judgment component, converts the sub-pixels of the pixel that correspond to the image element to a sub-pixel set of black, red, green or blue based on the chromatic color of the image element, in accordance with a pre-specified condition;

a replacement component which, within a single pixel or a pre-specified sub-pixel group that results from the image element that is judged to be chromatic by the judgment component and converted to a sub-pixel set of black and the color other than white and black by the conversion component, replaces each incidence of a pre-specified sub-pixel set of colors with a pre-specified black-and-white sub-pixel set, wherein the replacement component replaces a sub-pixel set of {red, green, blue} with a black-and-white sub-pixel set of one of {white, white, white}, {white, white, black}, {white, black, black} and {black, black, black}, and

a reorder component, which reorders the sub-pixel set for the sub-pixels of the pixels corresponding to the image element determined to be either chromatic or non-chromatic such that the surface area ratios of white, black, red, green and blue do not change, wherein processing of each component is performed by a processor.

4. The image processing device of claim 3, wherein each sub-pixel comprises (i) a back substrate including a red colored layer, a green colored layer and a blue colored layer and (ii) a transparent front substrate, the white particles and the black particles being enclosed between the back substrate and the front substrate, each sub-pixel displaying one of white, black, red, green or blue, by moving the white particles and the black particles between the back substrate and the transparent front substrate.

5. An image processing method for displaying image data that is represented by a collection of image elements, the image processing method comprising:

(a) acquiring a plurality of pixels corresponding to the collection of image elements, each pixel comprising a plurality of sub-pixels, each sub-pixel comprising white particles, black particles and a colored layer and displaying one of white, black or a color of the colored layer, by moving the white particles and the black particles within the sub-pixel, wherein when the sub-pixel is displaying one of white, black or the color other than white or black, the other colors are not displayed;

(b) after acquiring the image data, for each image element of the image data, judging whether the image element is a chromatic color or a non-chromatic color;

(c) if the pixel has been judged to be non-chromatic in (b), selecting a pre-specified black-and-white sub-pixel set for the sub-pixels of the pixel that correspond to the image element in accordance with a gray level of the non-chromatic color of the image element;

(d) if the pixel has been judged to be chromatic in (b), converting the sub-pixels of the pixel that correspond to the image element to a sub-pixel set of black and the color other than white and black based on the chromatic color of the image element, in accordance with a pre-specified condition;

(e) replacing, within a single pixel or a pre-specified sub-pixel group that results from the image element that is judged to be chromatic in (b) and converted to a sub-pixel set of black and the color other than white and black in the conversion in (d), each incidence of a pre-specified sub-pixel set of colors with a pre-specified black-and-white sub-pixel set, wherein step (e) further includes replacing a sub-pixel set of {red, green, blue} with a black-and-white sub-pixel set of one of {white, white, white}, {white, white, black}, {white, black, black} and {black, black, black}; and

(f) reordering the sub-pixel set for the sub-pixels of the pixels corresponding to the image element determined to be either chromatic or non-chromatic such that the surface area ratios of white, black, red, green and blue do not change, wherein the above steps are performed by a processor.

6. The image processing method of claim 5, wherein each sub-pixel comprises (i) a back substrate including a colored layer and (ii) a transparent front substrate, the white particles and the black particles being enclosed between the back substrate and the front substrate, each sub-pixel displaying one of white, black or the color of the color layer, by moving the white particles and the black particles between the back substrate and the transparent front substrate.

7. An image processing method for displaying image data that is represented by a collection of image elements, the image processing method comprising:

(a) acquiring a plurality of pixels corresponding to the collection of image elements, each pixel comprising a plurality of sub-pixels, each sub-pixel comprising white particles, black particles, a red colored layer, a green colored layer and a blue colored layer and displaying one of white, black, red, green or blue, by moving the white particles and the black particles within the sub-pixel, wherein when the sub-pixel is displaying one of white, black, red, green or blue, the other colors are not displayed;

(b) after acquiring the image data, for each image element of the image data, judging whether the image element is a chromatic color or a non-chromatic color;

(c) if the pixel has been judged to be non-chromatic in (b), selecting a pre-specified black-and-white sub-pixel set for the sub-pixels of the pixel that correspond to the image element in accordance with a gray level of the non-chromatic color of the image element, which is represented by red, green and blue color data;

(d) if the pixel has been judged to be chromatic in (b), converting the sub-pixels of the pixel that correspond to the image element to a sub-pixel set of black, red, green or blue based on the chromatic color of the image element, in accordance with a pre-specified condition;

(e) replacing, within a single pixel or a pre-specified sub-pixel group that results from the image element that is judged to be chromatic in (b) and converted to a sub-pixel set of black and the color other than white and black in the conversion in (d), each incidence of a pre-specified sub-pixel set of colors with a pre-specified black-and-white sub-pixel set, wherein step (e) further includes replacing a sub-pixel set of {red, green, blue} with a black-and-white sub-pixel set of one of {white, white, white}, {white, white, black}, {white, black, black} and {black, black, black}; and

(f) reordering the sub-pixel set for the sub-pixels of the pixels corresponding to the image element determined to be either chromatic or non-chromatic such that the surface area ratios of white, black, red, green and blue do not change, wherein the above steps are performed by a processor.

8. The image processing method of claim 7, wherein each sub-pixel comprises (i) a back substrate including a red colored layer, a green colored layer and a blue colored layer and (ii) a transparent front substrate, the white particles and the black particles being enclosed between the back substrate and the front substrate, each sub-pixel displaying one of white, black, red, green or blue, by moving the white particles and the black particles between the back substrate and the transparent front substrate.

9. A non-transitory storage medium readable by a computer, the non-transitory storage medium storing a program of instructions executable by the computer to perform a function for displaying image data that is represented by collection of image elements, the function comprising the steps of:

(a) acquiring a plurality of pixels corresponding to the collection of image elements, each pixel comprising a plurality of sub-pixels, each sub pixel comprising white particles, black particles and a colored layer and displaying one of white, black or a color of the colored layer, by moving the white particles and the black particles within the sub-pixel, wherein when the sub-pixel is displaying one of white, black or the color other than white or black, the other colors are not displayed;

(b) after acquiring the image data, for each image element of the image data, judging whether the image element is a chromatic color or a non-chromatic color;

(c) if the pixel has been judged to be non-chromatic in step (b), selecting a pre-specified black-and-white sub-pixel set for the sub-pixels of the pixel that correspond to the image element in accordance with a gray level of the non-chromatic color of the image element;

(d) if the pixel has been judged to be chromatic in step (b), converting the sub-pixels of the pixel that correspond to the image element to a sub-pixel set of black and the color other than white and black based on the chromatic color of the image element, in accordance with a pre-specified condition;

(e) replacing, within a single pixel or a pre-specified sub-pixel group that results from the image element that is judged to be chromatic in (b) and converted to a sub-pixel set of black and the color other than white and black in the conversion in step (d), each incidence of a pre-specified sub-pixel set of colors with a pre-specified black-and-white sub-pixel set, wherein step (e) further includes replacing a sub-pixel set of {red, green, blue} with a black-and-white sub-pixel set of one of {white, white, white}, {white, white, black}, {white, black, black} and {black, black, black}; and

(f) reordering the sub-pixel set for the sub-pixels of the pixels corresponding to the image element determined to be either chromatic or non-chromatic such that the surface area ratios of white, black, red, green and blue do not change.

10. The non-transitory storage medium of claim 9, wherein each sub-pixel comprises (i) a back substrate including a colored layer and (ii) a transparent front substrate, the white particles and the black particles being enclosed between the back substrate and the front substrate, each sub-pixel displaying one of white, black or the color of the color layer, by moving the white particles and the black particles between the back substrate and the transparent front substrate.

11. A non-transitory storage medium readable by a computer, the non-transitory storage medium storing a program of instructions executable by the computer to perform a function for displaying image data that is represented by a collection of image elements, the function comprising the steps of:

(a) acquiring a plurality of pixels corresponding to the collection of image elements, each pixel comprising a plurality of sub-pixels, each sub-pixel comprising white particles, black particles, a red colored layer, a green colored layer and a blue colored layer and displaying one of white, black, red, green or blue, by moving the white particles and the black particles within the sub-pixel, wherein when the sub-pixel is displaying one of white, black, red, green or blue, the other colors are not displayed;

(b) after acquiring the image data, for each image element of the image data, judging whether the image element is a chromatic color or a non-chromatic color;

(c) if the pixel has been judged to be non-chromatic in step (b), selecting a pre-specified black-and-white sub-pixel set for the sub-pixels of the pixel that correspond to the image element in accordance with a gray level of the non-chromatic color of the image element, which is represented by red, green and blue color data;

(d) if the pixel has been judged to be chromatic in step (b), converting the sub-pixels of the pixel that correspond to the image element to a sub-pixel set of black, red, green or blue based on the chromatic color of the image element, in accordance with a pre-specified condition;

(e) replacing, within a single pixel or a pre-specified sub-pixel group that results from the image element that is judged to be chromatic in (b) and converted to a sub-pixel set of black and the color other than white and black in the conversion in step (d), each incidence of a pre-specified sub-pixel set of colors with a pre-specified black-and-white sub-pixel set, wherein step (e) further includes replacing a sub-pixel set of {red, green, blue} with a black-and-white sub-pixel set of one of {white, white, white}, {white, white, black}, {white, black, black} and {black, black, black}; and

(f) reordering the sub-pixel set for the sub-pixels of the pixels of the pixels corresponding to the image element determined to be either chromatic or non-chromatic such that the surface area ratios of white, black, red, green and blue do not change.

12. The non-transitory storage medium of claim 11, wherein each sub-pixel comprises (i) a back substrate including a red colored layer, a green colored layer and a blue colored layer and (ii) a transparent front substrate, the white particles and the black particles being enclosed between the back substrate and the front substrate, each sub-pixel displaying one of white, black, red, green or blue, by moving the white particles and the black particles between the back substrate and the transparent front substrate.