Image processing device, imaging device, image processing method, imaging method, and image processing program for pseudo-color supression in an image

Patent metadata

Field	Value
Publication number	US-9232203-B2
Application number	US-201314031651-A
Country	US
Kind code	B2
Filing date	Sep 19, 2013
Priority date	Jul 13, 2007
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

An image processing device including a synchronization unit ( 25 ) for generating a luminance (Y′) from the sum of pixel signals R, Gr, Gb, B, for subtracting the R pixel signal and the B pixel signal from the sum of the Gr pixel signal and Gb pixel signal so as to generate a first color difference (C 1 ), and for calculating a difference between the R pixel signal and the B pixel signal to generate a second color difference (C 2 ), a pseudo-color suppression unit ( 31 ) for performing pseudo-color suppression of the first color difference (C 1 ) and/or the second color difference (C 2 ), a color space conversion unit ( 37 ) for converting the luminance Y′, the first color difference (C 1 ), the second color difference (C 2 ), into a predetermined color space to generate YUV color information.

First claim

The invention claimed is:

1. An apparatus, comprising:
image processing circuitry to generate a color image from a color mosaic image, the color mosaic image comprising an array of red pixel, blue pixel, and green pixel luminance values, wherein to generate the color image the image processing circuitry to:
determine first and second color differences based on at least a portion of the color mosaic image, wherein to determine the first color difference the image processing circuitry to subtract a combined sum of red pixel luminance values and of blue pixel luminance values of the portion from a sum of green pixel luminance values of the portion, wherein to determine the second color difference the image processing circuitry to determine a difference between a sum of red pixel luminance values and a sum of blue pixel luminance values of the portion;
suppress pseudo-color in at least one of the first color difference or the second color difference to generate at least one of a pseudo-color suppressed first color difference or a pseudo-color suppressed second color difference; and
perform color space conversion of at least one of the pseudo-color suppressed first color difference or the pseudo-color suppressed second color difference.

2. The apparatus of claim 1 , wherein to suppress pseudo-color, the image processing circuitry to generate at least a one parameter corresponding to a high frequency luminance component in at least one of a first direction or a second direction different than the first direction.

3. The apparatus of claim 2 , wherein the portion of the color mosaic image includes a red pixel, a blue pixel, a green-red pixel corresponding to a green pixel located adjacent to the red pixel in the first direction of the pixel array, and a green-blue pixel corresponding to a green pixel located adjacent to the blue pixel in the second direction, wherein to generate the first color difference the image processing circuitry to subtract the luminance values of the red pixel and blue pixel from a sum of the luminance values of the green-red pixel and the green-blue pixel, wherein to generate the second color difference the image processing circuitry to determine a difference between the red pixel and blue pixel luminance values, and wherein the at least one parameter corresponding to the high frequency luminance component comprises a difference between the green-red pixel and the green-blue pixel luminance values.

4. The apparatus of claim 1 , further comprising a low pass filter to remove at least one high frequency component of the first color difference and of the second color difference.

5. The apparatus of claim 1 , further comprising an image sensor to generate the color mosaic image.

6. The apparatus of claim 1 , further comprising an image sensor to generate the color mosaic image; and imaging optics to image an object image on the image sensor.

7. The apparatus of claim 6 , further comprising an optical low-pass filter arranged in an incident light path forming the object image on the image sensor.

8. A method, comprising:
determining first and second color differences based on at least a portion of the color mosaic image, wherein determining the first color difference comprises subtracting a combined sum of red pixel luminance values and of blue pixel luminance values of the portion from a sum of green pixel luminance values of the portion, wherein determining the second color difference comprises determining a difference between a sum of red pixel luminance values and a sum of blue pixel luminance values of the portion;
suppressing pseudo-color in at least one of the first color difference or the second color difference to generate at least one of a pseudo-color suppressed first color difference or a pseudo-color suppressed second color difference; and
performing color space conversion of at least one of the pseudo-color suppressed first color difference or the pseudo-color suppressed second color difference.

9. The method of claim 8 , wherein suppressing pseudo-color comprises generating at least a one parameter corresponding to a high frequency luminance component in at least one of a first direction or a second direction different than the first direction.

10. The method of claim 9 , wherein the portion of the color mosaic image includes a red pixel, a blue pixel, a green-red pixel corresponding to a green pixel located adjacent to the red pixel in the first direction of the pixel array, and a green-blue pixel corresponding to a green pixel located adjacent to the blue pixel in the second direction, wherein determining the first color difference comprises subtracting the luminance values of the red pixel and blue pixel from a sum of the luminance values of the green-red pixel and the green-blue pixel, wherein determining the second color difference comprises determining a difference between the red pixel and blue pixel luminance values, and wherein the at least one parameter corresponding to the high frequency luminance component comprises a difference between the green-red pixel and the green-blue pixel luminance values.

11. The method of claim 8 , further comprising removing at least one high frequency component of the first color difference and of the second color difference with a low pass filter.

Assignees

• Intel Corp

Inventors

• Sawada Yasuhiro

Classifications

• G06T3/4015 Primary

  Image demosaicing, e.g. colour filter arrays [CFA] or Bayer patterns · CPC title

• H04N25/134

  based on three different wavelength filter elements · CPC title

• H04N23/843 Primary

  Demosaicing, e.g. interpolating colour pixel values · CPC title

• H04N23/12

  with one sensor only · CPC title

• H04N2209/046

  Colour interpolation to calculate the missing colour values · CPC title