Maximum and minimum filter in mosaic image

1. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a maximum value among pixel values of a plurality of same-color neighboring pixels and pixel values of a plurality of different-color neighboring pixels, each of the plurality of same-color neighboring pixels holding a color component identical to a color component held in a processing target pixel selected from the pixels included in the image data, each of the plurality of different-color neighboring pixels holding a color component different from the color component held in the processing target pixel, the plurality of different-color neighboring pixels being located closer to the processing target pixel than the plurality of same-color neighboring pixels; and

a correction unit that compares a pixel value of the processing target pixel with the maximum value and replaces the pixel value of the processing target pixel with the maximum value if the pixel value of the processing target pixel is greater than the maximum value.

2. An image processing device according to claim 1 , wherein:

the calculation unit references the pixel values of the different-color pixels having undergone gain adjustment executed in reference to the color component held in the processing target pixel by using a white balance adjustment value determined in advance among the color components of the image data.

3. An image processing device according to claim 1 , wherein:

when the image data assumes a square grid array format, the calculation unit uses pixel values of different-color pixels present within a 3×3 pixel range centered on the processing target pixel as the pixel values of the plurality of different-color neighboring pixels.

4. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a maximum value among pixel values of a plurality of neighboring pixels, which include, at least, pixel values of a plurality of different-color neighboring pixels each holding a color component different from a color component held in a processing target pixel selected from the pixels included in the image data, the plurality of different-color neighboring pixels being located closer to the processing target pixel than a plurality of same-color neighboring pixels each holding a color component identical to the color component held in the processing target pixel; and

a correction unit that compares a pixel value of the processing target pixel with the maximum value and replaces the pixel value of the processing target pixel with the maximum value if the pixel value of the processing target pixel is greater than the maximum value.

5. An image processing device according to claim 4 , wherein:

the calculation unit references the pixel values of the different-color pixels having undergone gain adjustment executed in reference to the color component held in the processing target pixel by using a white balance adjustment value determined in advance among the color components of the image data.

6. An image processing device according to claim 4 , wherein:

when the image data assumes a square grid array format, the calculation unit uses pixel values of different-color pixels present within a 3×3 pixel range centered on the processing target pixel as the pixel values of the plurality of different-color neighboring pixels.

7. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a minimum value among pixel values of a plurality of same-color neighboring pixels and pixel values of a plurality of different-color neighboring pixels, each of the plurality of same-color neighboring pixels holding a color components identical to a color component held in a processing target pixel selected from the pixels included in the image data, each of the plurality of different-color neighboring pixels holding a color component different from the color component held in the processing target pixel, the plurality of different-color neighboring pixels being located closer to the processing target pixel than the plurality of same-color neighboring pixels; and

a correction unit that compares a pixel value of the processing target pixel with the minimum value and replaces the pixel value of the processing target pixel with the minimum value if the pixel value of the processing target pixel is smaller than the minimum value.

8. An image processing device according to claim 7 , wherein:

the calculation unit references the pixel values of the different-color pixels having undergone gain adjustment executed in reference to the color component held in the processing target pixel by using a white balance adjustment value determined in advance among the color components of the image data.

9. An image processing device according to claim 7 , wherein:

when the image data assumes a square grid array format, the calculation unit uses pixel values of different-color pixels present within a 3×3 pixel range centered on the processing target pixel as the pixel values of the plurality of different-color neighboring pixels.

10. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a minimum value among pixel values of a plurality of neighboring pixels, which include, at least, pixel values of a plurality of different-color neighboring pixels each holding a color component different from a color component held in a processing target pixel selected from the pixels included in the image data, the plurality of different-color neighboring pixels being located closer to the processing target pixel than a plurality of same-color neighboring pixels each holding a color component identical to the color component held in the processing target pixel; and

a correction unit that compares a pixel value of the processing target pixel with the minimum value and replaces the pixel value of the processing target pixel with the minimum value if the pixel value of the processing target pixel is smaller than the minimum value.

11. An image processing device according to claim 10 , wherein:

the calculation unit references the pixel values of the different-color pixels having undergone gain adjustment executed in reference to the color component held in the processing target pixel by using a white balance adjustment value determined in advance among the color components of the image data.

12. An image processing device according to claim 10 , wherein:

when the image data assumes a square grid array format, the calculation unit uses pixel values of different-color pixels present within a 3×3 pixel range centered on the processing target pixel as the pixel values of the plurality of different-color neighboring pixels.

13. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a maximum value among pixel values of a plurality of same-color neighboring pixels and pixel values of a plurality of different-color neighboring pixels, each of the plurality of same-color neighboring pixels holding a color component identical to a color component held in a processing target pixel selected from the pixels included in the image data, each of the plurality of different-color neighboring pixels holding a color component different from the color component held in the processing target pixel, the plurality of different-color neighboring pixels being located closer to the processing target pixel than the plurality of same-color neighboring pixels; and

a correction unit that compares a pixel value of the processing target pixel with the maximum value and replaces the pixel value of the processing target pixel with the maximum value if the pixel value of the processing target pixel is greater than the maximum value, wherein

the calculation unit further calculates a minimum value among the pixel values of the pixels having been referenced when calculating the maximum value;

the image processing device further comprises a setting unit that calculates a difference by subtracting the minimum value from the maximum value having been calculated and sets a value obtained by multiplying the difference by a constant as a threshold value for the processing target pixel; and

the correction unit compares the pixel value of the processing target pixel with a sum obtained by adding the threshold value to the maximum value and replaces the pixel value of the processing target pixel with the maximum value if the pixel value of the processing target pixel is greater than the sum.

14. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a maximum value among pixel values of a plurality of neighboring pixels, which include, at least, pixel values of a plurality of different-color neighboring pixels each holding a color component different from a color component held in a processing target pixel selected from the pixels included in the image data, the plurality of different-color neighboring pixels being located closer to the processing target pixel than a plurality of same-color neighboring pixels each holding a color component identical to the color component held in the processing target pixel; and

a correction unit that compares a pixel value of the processing target pixel with the maximum value and replaces the pixel value of the processing target pixel with the maximum value if the pixel value of the processing target pixel is greater than the maximum value, wherein

the calculation unit further calculates a minimum value among the pixel values of the pixels having been referenced when calculating the maximum value;

the image processing device further comprises a setting unit that calculates a difference by subtracting the minimum value from the maximum value having been calculated and sets a value obtained by multiplying the difference by a constant as a threshold value for the processing target pixel; and

the correction unit compares the pixel value of the processing target pixel with a sum obtained by adding the threshold value to the maximum value and replaces the pixel value of the processing target pixel with the maximum value if the pixel value of the processing target pixel is greater than the sum.

15. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a minimum value among pixel values of a plurality of same-color neighboring pixels and pixel values of a plurality of different-color neighboring pixels, each of the plurality of same-color neighboring pixels holding a color components identical to a color component held in a processing target pixel selected from the pixels included in the image data, each of the plurality of different-color neighboring pixels holding a color component different from the color component held in the processing target pixel, the plurality of different-color neighboring pixels being located closer to the processing target pixel than the plurality of same-color neighboring pixels; and

a correction unit that compares a pixel value of the processing target pixel with the minimum value and replaces the pixel value of the processing target pixel with the minimum value if the pixel value of the processing target pixel is smaller than the minimum value, wherein

the calculation unit further calculates a maximum value among the pixel values of the pixels having been referenced when calculating the minimum value;

the image processing device further comprises a setting unit that calculates a difference by subtracting the minimum value from the maximum value having been calculated and sets a value obtained by multiplying the difference by a constant as a threshold value for the processing target pixel; and

the correction unit compares the pixel value of the processing target pixel with a remainder obtained by subtracting the threshold value from the minimum value and replaces the pixel value of the processing target pixel with a minimum value if the pixel value of the processing target pixel is smaller than the remainder.

16. An image processing device that corrects a pixel value in image data, comprising:

an input unit that inputs image data having a plurality of color components and including a plurality of pixels each holding one color component among the plurality of color components;

a calculation unit that calculates a minimum value among pixel values of a plurality of neighboring pixels, which include, at least, pixel values of a plurality of different-color neighboring pixels each holding a color component different from a color component held in a processing target pixel selected from the pixels included in the image data, the plurality of different-color neighboring pixels being located closer to the processing target pixel than a plurality of same-color neighboring pixels each holding a color component identical to the color component held in the processing target pixel; and

a correction unit that compares a pixel value of the processing target pixel with the minimum value and replaces the pixel value of the processing target pixel with the minimum value if the pixel value of the processing target pixel is smaller than the minimum value, wherein

the calculation unit further calculates a maximum value among the pixel values of the pixels having been referenced when calculating the minimum value;

the image processing device further comprises a setting unit that calculates a difference by subtracting the minimum value from the maximum value having been calculated and sets a value obtained by multiplying the difference by a constant as a threshold value for the processing target pixel; and

the correction unit compares the pixel value of the processing target pixel with a remainder obtained by subtracting the threshold value from the minimum value and replaces the pixel value of the processing target pixel with a minimum value if the pixel value of the processing target pixel is even smaller than the remainder.