Enhancing image resolution by rotation of image plane
An imaging apparatus with adjustable imaging plane, the apparatus having mechanical, electronic or optical devices to adjust the position and the orientation of the imaging plane, which successively captures a plurality of images while adjusting the imaging plane, and a method to integrate the captured images to a single high-resolution image by exploration of the mutual information not available in a single image, such as the sub-pixel observations due to the spatial misalignment, thus achieving an image resolution higher than the sensor resolution.
1. An imaging apparatus with adjustable imaging plane, the apparatus comprising:
a lens for focusing electromagnetic waves on an imaging plane;
an array of sensors disposed on the imaging plane;
a control unit for capturing a plurality of normal resolution images;
a memory for storing the plurality of normal resolution images;
a processor for performing computations on the normal resolution images;
means for rotating the imaging plane along X , Y and Z axes; and
means for integrating the plurality of normal resolution images for creating an image with higher resolution than the sensor resolution.
2. The apparatus of claim 1 , wherein mechanical, electronic or optical means rotate the imaging plane freely around the X, Y and Z axes.
3. The apparatus of claim 1 , wherein the control unit directs successive capture of a plurality of normal resolution images while adjusting the position and the orientation of the imaging plane.
4. The apparatus of claim 1 , wherein the memory further stores computational codes that are available to integrate the captured images as a single image with higher spatial resolution and richer frequency content than the sensor resolution.
5. The apparatus of claim 1 , wherein the electromagnetic waves are visible light or X-ray, and the imaging object resides in air, water, vacuum, or other media.
6. The apparatus of claim 1 , wherein the sensors are from a group consisting of CCD array, CMOS array, and film.
7. A computational method of enhancing image spatial resolution and frequency content, the method comprising:
deriving a correspondence between captured images based on a relative rotation of an imaging plane along X, Y and Z axes;
warping all the normal resolution images to a common reference coordinate; and
estimating a high-resolution image that yields projections on the imaging plane closest to normal resolution observations.
8. The method of claim 7 , wherein estimating the high-resolution image further comprises using all normal resolution images at the same time in a batch mode.
9. The method of claim 7 , wherein the estimating the high-resolution image further comprises combining a new captured image and the previously estimated high-resolution image in a sequential mode for generating a new high-resolution image.
10. The method of claim 7 , wherein estimating the high-resolution image further comprises performing non-uniform interpolation.
11. The method of claim 7 , wherein estimating the high-resolution image further comprises maximizing posteriori (MAP) optimization.
12. The method of claim 7 , wherein estimating the high-resolution image further comprises performing a constrained least square regularization technique.
13. The method of claim 7 , wherein the estimating the high-resolution image further comprises performing a projection onto convex sets (POCS) technique.
14. The method of claim 7 , wherein estimating the high-resolution image further comprises performing an iterative back-projection technique.
15. An imaging apparatus for rotating an imaging plane, the apparatus comprising:
an array of sensors forming the imaging plane;
a lens for focusing electromagnetic waves on the imaging plane;
a control unit for capturing a plurality of normal resolution images;
a memory for storing the plurality of normal resolution images;
a processor for performing computations on the normal resolution images;
means for rotating the array of sensors along X, Y and Z axes so that the imaging plane is rotated along X, Y and Z axes; and
means for integrating the plurality of normal resolution images for creating an image with higher resolution than the sensor resolution.
16. The apparatus of claim 15 , wherein mechanical, electronic or optical means rotate the array of sensors so that the imaging plane rotates freely around the X, Y and Z axes.
17. The apparatus of claim 15 , wherein the control unit directs successive capture of a plurality of normal resolution images while adjusting the position and the orientation of the imaging plane.
18. The apparatus of claim 15 , wherein the memory further stores computational codes that are available to integrate the captured images as a single image with higher spatial resolution and richer frequency content than the sensor resolution.
19. The apparatus of claim 1 , wherein the electromagnetic waves are visible light or X-ray, and the imaging object resides in air, water, vacuum, or other media.
20. The apparatus of claim 15 , wherein the sensors are from a group consisting of CCD array and CMOS array.