Method and apparatus for up-interpolating a bayer image

Details Method and apparatus for up-interpolating a bayer image Method and apparatus for up-interpolating a bayer image

2000-09-11

2004-08-03

Tran, Phuoc (Department: 2621)

Image analysis

Color image processing

C382S167000, C382S293000

Reexamination Certificate

active

06771811

ABSTRACT:

FIELD OF INVENTION
The present invention relates to a method and apparatus for up-interpolating a Bayer image.
The invention has been developed primarily for a digital camera including an integral printer for providing a paper print of an image captured by the camera and will be described hereinafter with reference to that application. However, it will be appreciated that the invention is not limited to that particular field of use.
SUMMARY OF INVENTION
According to a first aspect of the invention there is provided a method for interpolating a Bayer image of red, green and blue pixels from an input space to an output space, the method including the steps of:
receiving the Bayer image; and
mapping each of the colors to the output space in accordance with the following:
x
′
=
(
x
mps
)
+
k
1
y
′
=
(
y
mps
)
+
k
2
where:
x,y is the coordinate in the output space,
x′y′ is the coordinate in the input space;
mps is the number of pixels in the output space per input space sample, and
k
1,2
are either 0 or −0.5 depending on the color and the desired relative rotational orientation of the image.
Preferably, for the green pixels in the input space, each ordinate of the input space is multiplied by 1/2. More preferably, for the green pixels in the input space, each coordinate of the input space is multiplied by 1/2.
According to a second aspect of the invention there is provided an apparatus for interpolating a Bayer image of red, green and blue pixels from an input space to an output space, the method including the steps of:
receiving the Bayer image; and
mapping each of the colors to the output space in accordance with the following:
x
′
=
(
x
mps
)
+
k
1
y
′
=
(
y
mps
)
+
k
2
where:
x,y is the coordinate in the output space,
x′y′ is the coordinate in the input space;
mps is the number of pixels in the output space per input space sample, and
k
1,2
are either 0 or −0.5 depending on the color and the desired relative rotational orientation of the image.
Preferably, for the green pixels in the input space, each ordinate of the input space is multiplied by 1/2. More preferably, for the green pixels in the input space, each coordinate of the input space is multiplied by 1/2.


REFERENCES:
patent: 6205245 (2001-03-01), Yuan et al.
patent: 6466618 (2002-10-01), Messing et al.
patent: 6573932 (2003-06-01), Adams et al.
EP 0 709 825 A (Harris Corp); May 1, 1996; abstract; p. 2, line 6-line 27; p. 3, line 4-line 53; p. 5, line 17-line 22; p. 5, line 38-line 48.
“Software Pixel Interpolation for Digital Still Cameras Suitable for a 32-bit MCU” Sakamoto T., Nakanishi C., Hase T. IEEE Transactions on Consumer Electronics, vol. 44, No. 4, pp 1342-1352, Nov. 1998.

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