Shading noise filter
AssigneeTranspacific Systems, LLC
InventorKuo-Jeng Wang
Life of this patent
Estimating the term…
Abstract
A shading correction is employed for a scanner to correct shading distortion. However, an image corrected with the shading corrective curve has shading noise lines due to the effects of various factors in the producing process of the shading corrective curve. The characteristic of the shading noise is that the each value of any primary color channel, of each pixel in a line is higher or lower than of the adjacent two pixels in other lines, wherein a color channel is one of red, green, or blue channel. Hence, the quality of the image is improved by removing the shading noise detected from the characteristic described above.
Claims61
1-20. (canceled)
A method, comprising:
- detecting shading noise in a given line of an image based at least in part on at least a portion of a first line adjacent said given line and at least a portion of a second line adjacent the given line.
A method, comprising:
- detecting a shading noise in an image by multiplying a first difference with a second difference, wherein the first difference is taken between color values of a first adjacent pixel and a color value of a given pixel of a given line, and wherein the second difference is taken between a color value of a second adjacent pixel and said color value of said given pixel;
- and
- eliminating said shading noise from said given line in said image.
An apparatus, comprising:
- means for detecting shading noise in a given line of an image based at least in part on at least a portion of a first line adjacent said given line and at least a portion of a second line adjacent the given line;
- and
- means for eliminating said shading noise from said given line in said image.
An apparatus, comprising:
- a scanner, said scanner capable of:
- detecting a shading noise in an image by multiplying a first difference with a second difference, wherein the first difference is taken between color values of a first adjacent pixel and a color value of a given pixel in a. given line, and wherein the second difference is taken between a color value of a second adjacent pixel and said color value of said given pixel;
- and
- eliminating said shading noise from said given line in said image.
An article comprising:
- a storage medium having stored thereon instructions, that, if executed, result in of a method comprising:
- detecting shading noise in a given line of an image based at least in part on at least a portion of a first line adjacent said given line and at least a portion of a second line adjacent the given line.
An article comprising:
- a storage medium having stored thereon instructions, that, if executed, result in of a method comprising:
- detecting a shading noise in an image by multiplying a first difference with a second difference, wherein the first difference is taken between color values of a first adjacent pixel and a color value of a given,pixel of a given line, and wherein the second difference is taken between a color value of a second adjacent pixel and said color value of said given pixel;
- and
- eliminating said shading noise from said given line in said image.
A method, comprising:
- detecting shading noise in a given line of an image based at least in part on at least a portion of a first line adjacent said given line, wherein said detecting is based at least in part on a threshold of a preselected percentage of pixels in said given line;
- and
- eliminating said shading noise from said given line in said image.
Dependencies are inferred from the claim text.