System and method for optimizing image resolution using pixelated imaging device
View Patent ↗A method of processing image data for display on a pixelated imaging device is disclosed. The method comprises: pre-compensation filtering an image input to produce pre-compensation filtered pixel values, the pre-compensation filter having a transfer function that approximates the function that equals one divided by a pixel transfer function; and displaying the pre-compensation filtered pixel values on the pixelated imaging device. In another disclosed method, the method further comprises: pre-compensation filtering an image input for each of a plurality of superposed pixelated imaging devices, at least two of which are unaligned, to produce multiple sets of pre-compensation filtered pixel values; and displaying the multiple pre-compensation filtered pixel values on the plurality of superposed pixelated imaging devices.
1. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input for each of a plurality of superposed pixelated imaging devices, at least two of which are unaligned, to produce multiple sets of pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function that approximates the function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device; and
displaying the multiple pre-compensation filtered pixel values on six imaging devices, the six imaging devices being positioned in four spatial phase families, the first and third spatial phase families each corresponding to a separate imaging device, each of which is fed green chrominance values, the second and fourth spatial phase families each corresponding to a pair of aligned imaging devices, each pair having an imaging device that is fed blue chrominance values and an imaging device that is fed red chrominance values.
2. A method according to claim 1 , wherein the four spatial phase families are diagonally offset from each other by one-quarter of a diagonal pixel dimension of the pixelated imaging device.
3. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input for each of a plurality of superposed pixelated imaging devices, at least two of which are unaligned, to produce multiple sets of pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function that approximates the function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device;
displaying the multiple pre-compensation filtered pixel values on three imaging devices, the three imaging devices being positioned in two spatial phase families, the first spatial phase family corresponding to an imaging device that is fed green chrominance values, the second spatial phase family corresponding to an imaging device that is fed blue chrominance values and to an aligned imaging device that is fed red chrominance values.
4. A method according to claim 3 , wherein the two spatial phase families are diagonally offset from each other by one-half of a diagonal pixel dimension of the pixelated imaging device.
5. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input to produce pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function that equals the result of gain-limiting and clipping the function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device;
and
displaying the pre-compensation filtered pixel values on the pixelated imaging device;
wherein the pre-compensation filter transfer function is clipped at a frequency that exceeds the Nyquist frequency of the pixelated imaging device.
6. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input to produce pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function that equals the result of gain-limiting and clipping the function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device;
and
pre-compensation filtering image input data that is in a perception-based format to yield a filtered perception-based pixel value for each pixel of the pixelated imaging device; and
converting each filtered perception-based pixel value to a corresponding color value, for each pixel of the pixelated imaging device;
displaying the pre-compensation filtered pixel values on the pixelated imaging device.
7. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input to produce pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function that approximates the function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device; and
displaying in the pre-compensation filtered pixel values on the pixelated imaging device;
wherein the step of pre-compensation filtering further requires:
filtering the image input with a pre-compensation filter having a transfer function that equals the result of gain-limiting and clipping a function equal to:
H
[
u
,
V
]
=
1
{
Sin
c
[
u
]
*
Sin
c
[
V
]
}
where a function Sin c[x] is defined as:
Sin
c
[
x
]
=
{
1
,
x
=
0
sin
[
x
]
x
,
x
≠
0
and “*” denotes convolution, and u,V are spatial frequency variables.
8. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input for each of a plurality of superposed pixelated imaging devices, at least two of which are unaligned, to produce pre-multiple sets of pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function equals the result of gain-limiting and clipping a function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device; and
displaying the multiple pre-compensation filtered pixel values on the plurality of superposed pixelated imaging devices
wherein pre-compensation filtering image input data that is in a perception-based format to yield a filtered perception-based pixel value for each pixel of each pixelated imaging device of the plurality of pixelated imaging devices; and
converting each filtered perception-based pixel value to a corresponding color value, for each pixel of each pixelated imaging device of the plurality of superposed pixelated imaging devices.
9. A method of processing image data for display on a pixelated imaging device having an associated Nyquist frequency, the method comprising:
pre-compensation filtering an image input for each of a plurality of superposed pixelated imaging devices, at least two of which are unaligned, to produce multiple sets of pre-compensation filtered pixel values, the pre-compensation filtering being performed with a filter having a transfer function that approximates the function that equals one divided by a pixel transfer function, at least over a frequency range whose upper limit does not exceed the Nyquist frequency of the pixelated imaging device;
the pre-compensation filter having a transfer function that equals the result of gain-limiting and clipping a function equal to:
H
[
u
,
V
]
=
1
{
Sin
c
[
u
]
*
Sin
c
[
V
]
}
where a function Sin c[x] is defined as:
Sin
c
[
x
]
=
{
1
,
x
=
0
sin
[
x
]
x
,
x
≠
0
and “k” denotes convolution, and u,V are spatial frequency variables.
10. A method of displaying an image, the method comprising:
processing an image input data set to produce pixel values for display on a plurality of superposed pixelated imaging devices, at least two of which are unaligned; and
displaying the pixel values on six imaging devices, the six imaging devices being positioned in four spatial phase families, the first and third spatial phase families each corresponding to a separate imaging device, each of which is fed green chrominance values, the second and fourth spatial phase families each corresponding to a pair of aligned imaging devices, each pair having an imaging device that is fed blue chrominance values and an imaging device that is fed red chrominance values.
11. A method according to claim 10 , wherein the four spatial phase families are diagonally offset from each other by one-quarter of a diagonal pixel dimension of the pixelated imaging device.
12. A method according to claim 10 , the method further comprising:
displaying the pixel values on three imaging devices, the three imaging devices being positioned in two spatial phase families, the first spatial phase family corresponding to an imaging device that is fed green chrominance values, the second spatial phase family corresponding to an imaging device that is fed blue chrominance values and to an aligned imaging device that is fed red chrominance values.
13. A method according to claim 12 , wherein the two spatial phase families are diagonally offset from each other by one-half of a diagonal pixel dimension of the pixelated imaging device.
14. A method according to claim 10 , wherein the method further comprises:
unaligning at least two of the superposed pixelated imaging devices by spatially phase-shifting the at least two imaging devices with respect to each other in two spatial dimensions.
15. A method according to claim 14 , wherein the step of unaligning the at least two imaging devices comprises:
spatially phase-shifting at least two arrays of square pixels with respect to each other, the spatial phase-shift having equal horizontal and vertical components.
16. A method according to claim 14 , wherein the step of unaligning the at least two imaging devices comprises:
spatially phase-shifting at least two arrays of rectangular pixels with respect to each other, the spatial phase-shift having horizontal and vertical components of differing magnitudes.
17. A method according to claim 14 , wherein the method further comprises:
spatially aligning at least two imaging devices of the superposed pixelated imaging devices.
18. A method according to claim 10 , wherein the method further comprises:
unaligning at least two of the superposed pixelated imaging devices with respect to each other, by using imaging devices having differing properties chosen from the group consisting of: optical properties, physical properties, scale, rotational angle, aspect ratio, and relative liner offset.