Camera and printer combination using up-interpolation of Bayer image
View Patent ↗A camera comprising an image sensor comprising a Bayer color filter array adapted to capture an image; a processor; and a printer; wherein the processor receives a captured Bayer image of red, green and blue pixels from the image sensor, converts the captured image to a printable image and outputs the printable image to the printer for printing, wherein the captured image is converted to a printable image by: up-interpolating the image; sharpening the image; and converting the image to a print image of cyan, magenta and yellow pixels, and outputs the print image to the printer for printing.
1. A camera comprising:
an image sensor comprising a Bayer color filter array adapted to capture an image;
a processor; and
a printer;
wherein the processor receives a captured Bayer image of red, green and blue pixels from the image sensor, converts the captured image to a printable image and outputs the printable image to the printer for printing, wherein the captured image is converted to a printable image by:
up-interpolating the image;
sharpening the image; and
converting the image to a print image of cyan, magenta and yellow pixels, and outputs the print image to the printer for printing.
2. A camera according to claim 1 wherein up-interpolating the image comprises mapping each of the colors from an input space to an output space in accordance with the following:
x
′
=
(
x
m
p
s
)
+
k
1
y
′
=
(
y
m
p
s
)
+
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.
3. A camera according to claim 2 wherein, for the green pixels in the input space, each co-ordinate of the input space is multiplied by 1/√2.
4. A camera according to claim 1 wherein sharpening the image comprises:
converting the image from an RGB color space to a first luminance space;
high-pass filtering the first luminance space;
adding a proportion of the filtered luminance space to first luminance space to produce a resultant luminance space; and
converting the resultant luminance space to color space.
5. A camera according to claim 4 wherein the high-pass filtering utilizes a 3×3 convolution kernel.
6. A camera according to claim 4 wherein the high-pass filtering utilizes a 5×5 convolution kernel.
7. A camera according to claim 4 wherein the high-pass filtering utilizes a 7×7 convolution kernel.
8. A camera according to claim 1 wherein converting the image to a print image comprises converting a contone CMY image to a dithered CMY image.