Camera with processor for up-interpolating a bayer image
View Patent ↗A camera has an image sensor for capturing an image in a Bayer image space and a processor for converting the captured image to an output space. Coordinates of the input space are mapped to the coordinates of the output space by dividing the output space coordinates by the number of pixels in the output space per input space sample, and adding a vector (K 1 , K 2 ) where K 1 and K 2 are either 0 or minus 0.5, depending on the color component and the desired relative rotational orientation of the image. The image is further converted to a CMY space for outputting to a printer of the camera.
1. A camera comprising:
an image sensor comprising a Bayer color filter array; and a processor for receiving a Bayer image of red, green and blue pixels from the image sensor and mapping each of the colors from an input space to an 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.
2. A camera according to claim 1 wherein, for the green pixels in the input space, each co-ordinate of the input space is multiplied by 1/√2.
3. A camera according to claim 1 wherein the Bayer image comprises two dimensional planes of red, green and blue pixels and wherein the processor is further adapted to:
rotate the green plane by 45 degrees;
sequentially sample an m×m pixel block of the rotated image, where m is an integer greater than 1;
provide an address for the m 2 samples by determining a starting address for a first of the samples and thereafter apply a predetermined fixed sequence of offsets to obtain the addresses of the remaining samples.
4. A camera according to claim 3 wherein determining the starting address is responsive to the relative rotational orientation of the image.
5. A camera according to 3, wherein m=4 and there are sixteen offsets.
6. A camera according to claim 1 wherein an image in the output space is further converted to an image in CMY space.
7. A camera according to claim 6 further comprising a printer, wherein said image in said CMY space is output to said printer for printing of the image.