Compressing image data

• US 20010046318A1
• Filed: 12/29/2000
• Published: 11/29/2001
• Est. Priority Date: 12/30/1999
• Status: Abandoned Application

• Current Assignee: Magnachip Semiconductor Limited (Magnachip Semiconductor)
• Original Assignee: Magnachip Semiconductor Limited (Magnachip Semiconductor)
• Inventors: Kim, Sang-Yeon, Lee, Suk-Joong
• Application Number:
  US09/750,036
• Publication Number:
  US 20010046318A1
• Time in Patent Office: Days
• US Class Current: 382/166
• CPC Class Codes: G06T 9/004 Predictors, e.g. intraframe, interframe coding

Abstract

Image data fed from an image sensor having a color pixel array by 2 dimensional compression and difference algorithm is disclosed. Firstly, the red, green and blue(R/G/B) color values from the image data extracted; vertical difference color values between current R/G/B color values of a current line and previous R/G/B color values of a previous line are calculated; the vertical difference color values with a predetermined loss value are calculated to obtain quota color values; and the horizontal difference color values between a current quota color value and a previous quota color value are estimated.

Claims

1. A method for compressing image data fed from an image sensor having a color pixel array, comprising:

(a) extracting red, green and blue(R/G/B) color values from the image data;

(b) calculating vertical difference color values between current R/G/B color values of a current line and previous R/G/B color values of a previous line;

(c) dividing the vertical difference color values with a predetermined loss value to obtain quota color values;

(d) estimating horizontal difference color values between a current quota color value and a previous quota color value; and

(e) coding the horizontal difference values.

2. A method according to

claim 1

, further including before (b):

determining if the image data corresponds to a first line of a frame and, if the image data corresponds to the first line of the frame, proceeding to (c) without performing (b).

3. A method according to

claim 1

or

claim 2

, further comprising before (c):

adding remainder color values obtained from (c) to the vertical difference values.

4. A method according to

claim 1

or

claim 2

, wherein the color pixel array has a bayer pattern.

5. A method according to

claim 1

, further comprising:

(g) repeating (a) to (d) during one line of the color pixel array and initializing the previous R/G/B color values after completing one line of the color pixel array.

6. A method for compressing image data fed from an image sensor having a color pixel array, comprising:

(a) extracting red, green and blue(R/G/B) color values from the image data;

(b) calculating vertical difference values between current R/G/B color values of a current line and previous R/G/B color values of a previous line, respectively;

(c) adding the vertical difference values with previous R/G/B remainder color values to obtain added color values;

(d) dividing the added color values with a predetermined loss value to generate current R/G/B quota color values and current R/G/B remainder color values;

(e) estimating horizontal difference values between the current R/G/B quota color values and previous R/G/B quota color values; and

(e) coding the horizontal difference values.

7. A method according to

claim 6

, further comprising:

(f) repeating (a) to (e) during one line of the color pixel array and initializing the previous R/G/B color values after completing one line of the color pixel array.

8. A method according to

claim 6

, further comprising before (b):

(g) determining if the image data corresponds to a first line of a frame and, if the image data corresponds to the first line of the frame, performing (c) without performing (b).

9. A computer readable medium having program code stored therein which when executed by a computer causes data representing image data from an image sensor having a color pixel array to be compressed by:

(a) extracting red, green and blue(R/G/B) color values from the image data;

(b) calculating vertical difference color values between current R/G/B color values of a current line and previous R/G/B color values of a previous line;

(c) dividing the vertical difference color values with a predetermined loss value to obtain quota color values;

(d) estimating horizontal difference color values between a current quota color value and a previous quota color value; and

(e) coding the horizontal difference values.

10. A computer readable medium according to

claim 9

, further including before (b):

determining if the image data corresponds to a first line of a frame and, if the image data corresponds to the first line of the frame, proceeding to (c) without performing (b).

11. A computer readable medium according to

claim 9

or

claim 10

, further comprising before (c):

adding remainder color values obtained from (c) to the vertical difference values.

12. A computer readable medium according to

claim 9

or

claim 10

, wherein the color pixel array has a bayer pattern.

13. A computer readable medium according to

claim 9

, further comprising:

(g) repeating (a) to (d) during one line of the color pixel array and initializing the previous R/G/B color values after completing one line of the color pixel array.

14. A computer readable medium having program code stored therein which when executed by a computer causes data representing image data from an image sensor having a color pixel array to be compressed by:

(a) extracting red, green and blue(R/G/B) color values from the image data;

(b) calculating vertical difference values between current R/G/B color values of a current line and previous R/G/B color values of a previous line, respectively;

(c) adding the vertical difference values with previous R/G/B remainder color values to obtain added color values;

(d) dividing the added color values with a predetermined loss value to generate current R/G/B quota color values and current R/G/B remainder color values;

(e) estimating horizontal difference values between the current R/G/B quota color values and previous R/G/B quota color values; and

(e) coding the horizontal difference values.

15. A computer readable medium according to

claim 14

, further comprising:

(f) repeating (a) to (e) during one line of the color pixel array and initializing the previous R/G/B color values after completing one line of the color pixel array.

16. A computer readable medium according to

claim 14

, further comprising before (b):

(g) determining if the image data corresponds to a first line of a frame and, if the image data corresponds to the first line of the frame, performing (c) without performing (b).