IMAGE DISTORTION CORRECTING METHOD AND DEVICE

• US 20090195676A1
• Filed: 01/30/2009
• Published: 08/06/2009
• Est. Priority Date: 01/31/2008
• Status: Active Grant

• Current Assignee: Mtekvision Co.Ltd.
• Original Assignee: Mtekvision Co.Ltd.
• Inventors: CHO, Chul-Lae
• Granted Patent: US 8,264,562 B2
• Time in Patent Office: Days
• US Class Current: 348/242
• CPC Class Codes: G06T 5/80 Geometric correction
• CPC Class Codes: H04N 9/646 for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Abstract

Device and method of correcting a distortion occurring at the time of displaying a high-resolution image on a low-resolution display unit are provided. The image distortion correcting method includes the steps of: analyzing color levels of all pixels of an input original image; determining a variation of the color levels depending on positions of the pixels; adjusting the variation of the color levels in a region where the variation departs from a predetermined threshold value; correcting the color levels of the pixels in accordance with the adjusted variation; and outputting the corrected image. Accordingly, it is possible to correct the image distortion occurring at the time of displaying an image input from an image sensor on a display module.

Claims

1. An image distortion correcting method comprising the steps of:

analyzing color levels of all pixels of an input original image;

determining a variation of the color levels depending on positions of the pixels;

adjusting the variation of the color levels in a region where the variation departs from a predetermined threshold value;

correcting the color levels of the pixels in accordance with the adjusted variation; and

outputting the corrected image.

2. The image distortion correcting method according to claim 1, wherein the input original image is an image having an RGB format in which each pixel has all pixel data of red, green, and blue.

3. The image distortion correcting method according to claim 1, wherein the step of analyzing the color levels includes analyzing the color levels of red, green, and blue, respectively.

4. The image distortion correcting method according to claim 1, wherein the step of determining the variation of the color levels includes determining the variation in one or more of an X axis direction and a Y axis direction.

5. The image distortion correcting method according to claim 1, wherein the step of adjusting the variation of the color levels includes adjusting the variation of the color levels only when the variations of the color levels of red, green, and blue are equal or similar to each other.

6. The image distortion correcting method according to claim 1, wherein the step of adjusting the variation of the color levels includes adjusting the variation of the color levels so that the variation of the color levels should not depart from the threshold value in the region.

7. The image distortion correcting method according to claim 6, wherein the step of adjusting the variation of the color levels includes adjusting the variation of the color levels so that the color levels in the region vary linearly.

8. A recording medium having recorded thereon a computer-readable program allowing a computer to execute an image distortion correcting method comprising the steps of:

analyzing color levels of all pixels of an input original image;

determining a variation of the color levels depending on positions of the pixels;

adjusting the variation of the color levels in a region where the variation departs from a predetermined threshold value;

correcting the color levels of the pixels in accordance with the adjusted variation; and

outputting the corrected image.

9. An image distortion correcting device comprising:

a color analyzing section analyzing color levels of all pixels of an input original image;

a variation determining section determining a variation of the color levels depending on positions of the pixels;

a variation adjusting section adjusting the variation of the color levels in a region where the variation departs from a predetermined threshold value; and

a correcting section correcting the color levels of the pixels in accordance with the adjusted variation.