Capturing and processing of images captured by camera arrays including cameras dedicated to sampling luma and cameras dedicated to sampling chroma
View Patent ↗A camera array, an imaging device and/or a method for capturing image that employ a plurality of imagers fabricated on a substrate is provided. Each imager includes a plurality of pixels. The plurality of imagers include a first imager having a first imaging characteristics and a second imager having a second imaging characteristics. The images generated by the plurality of imagers are processed to obtain an enhanced image compared to images captured by the imagers. Each imager may be associated with an optical element fabricated using a wafer level optics (WLO) technology.
1. A camera array, comprising:
a plurality of cameras configured to capture images of a scene, where each camera comprises:
optics comprising at least one lens element and at least one aperture; and a sensor comprising a two dimensional array of pixels and control circuitry for controlling imaging parameters;
a controller configured to control operation parameters of the plurality of cameras; and
an image processing pipeline module;
wherein the plurality of cameras includes at least one camera dedicated to sampling luma and cameras dedicated to sampling chroma;
wherein the cameras that sample chroma are arranged symmetrically within the camera array to address occlusion due to parallax;
wherein the image processing pipeline module is configured to:
measure parallax using images captured by the plurality of cameras to produce a depth map; and
fuse images captured by the at least one camera dedicated to sampling luma and the cameras dedicated to sampling chroma to produce an image; and
wherein a camera dedicated to sampling luma forms a central camera and cameras dedicated to sampling chroma are distributed symmetrically around the central camera.
2. The camera array of claim 1 , wherein the central camera is selected from the group consisting of: a monochromatic camera including a Green spectral filter; a camera including a near-IR spectral filter; and a polychromatic camera.
3. The camera array of claim 1 , wherein the cameras dedicated to sampling chroma include at least one spectral filter selected from the group consisting of Red and Blue spectral filters.
4. The camera array of claim 1 , wherein the cameras dedicated to sampling chroma include a Bayer filter.
5. The camera array of claim 4 , wherein the Bayer filter comprises Red, Green, and Blue spectral filters.
6. The camera array of claim 4 , wherein the Bayer filter comprises Cyan, Magenta, and Yellow spectral filters.
7. The camera array of claim 4 , wherein the spectral filters in the Bayer filter provide full spectral data for the visible light spectrum.
8. The camera array of claim 1 , wherein the camera array comprises a monolithic camera array assembly comprising:
a lens element array forming the optics of each camera; and
a single semiconductor substrate on which all of the pixels and control circuitry for each camera are formed.
9. The camera array of claim 1 , wherein the plurality of cameras are formed on separate semiconductor substrates.
10. The camera array of claim 1 , wherein the plurality of cameras each have the same resolution.
11. The camera array of claim 1 , wherein the plurality of cameras comprises cameras having different resolutions.
12. The camera array of claim 1 , wherein the control circuitry of the at least one camera dedicated to luma sampling and the cameras dedicated to chroma sampling configure the cameras to operate with at least one difference in operating parameters.
13. The camera array of claim 12 , wherein a camera dedicated to sampling luma has greater resolution than a camera dedicated to sampling chroma.
14. The camera array of claim 12 , wherein the at least one difference in operating parameters includes at least one imaging parameter selected from the group consisting of exposure time, gain, and black level offset.
15. The camera array of claim 1 , wherein the plurality of cameras includes cameras having apertures of different sizes.
16. The camera array of claim 15 , wherein the at least one camera dedicated to luma sampling has a larger aperture than cameras dedicated to sampling chroma.
17. The camera array of claim 15 , wherein the at least one camera dedicated to luma sampling has a smaller aperture than at least one of the cameras dedicated to sampling chroma.
18. The camera array of claim 1 , wherein the plurality of cameras includes cameras having different exposure times.
19. The camera array of claim 18 , wherein the at least one camera dedicated to luma sampling has a longer exposure time than at least one of the cameras dedicated to sampling chroma.
20. The camera array of claim 18 , wherein the at least one camera dedicated to luma sampling has a shorter exposure time than at least one of the cameras dedicated to sampling chroma.
21. The camera array of claim 1 , wherein the fields of view of the plurality of cameras at least partially overlap.
22. The camera array of claim 1 , wherein the camera array comprises an array of between 2×2 and 6×6 cameras.
23. The camera array of claim 1 , wherein the camera array comprises a linear array of cameras.
24. The camera array of claim 23 , wherein the linear array of cameras comprises at least one selected from the group consisting of: a 1×4 array of cameras; and a 1×10 array of cameras.
25. The camera array of claim 1 , wherein the image processing pipeline module comprises a parallax confirmation and measurement module configured to measure parallax using images captured by the plurality of cameras by:
detecting parallax-induced changes that are consistent across the captured images taking into account the position of the cameras that captured the images; and
ignoring pixels in the captured images that are in an exposed occlusion set.
26. The camera array of claim 1 , wherein the image processing pipeline module is configured to select at least one distance as an “in best focus” distance and blur the produced image based upon the depth map.
27. The camera array of claim 1 , wherein the image processing pipeline module further comprises a super-resolution processing module configured to generate at least one higher resolution super-resolved image using images captured by the plurality of cameras and parallax measurements from the parallax confirmation and measurement module to compensate for parallax in the captured images.
28. A camera array, comprising:
a monolithic integrated module forming a linear array of cameras, where the monolithic integrated module comprises:
a lens element array forming the optics of each of the plurality of cameras, where the optics of each camera comprises at least one lens element and at least one aperture; and
a single semiconductor substrate on which all of the pixels and control circuitry for each camera are formed;
a controller configured to control operation parameters of the linear array of cameras; and
an image processing pipeline module;
wherein the linear array of cameras includes at least one camera dedicated to sampling luma and cameras dedicated to sampling chroma;
wherein a camera dedicated to sampling luma forms a central camera and the cameras that sample chroma are arranged symmetrically within the linear array on either side of the central camera to address occlusion due to parallax;
wherein the image processing pipeline module is configured to:
measure parallax using images captured by the linear array of cameras to produce a depth map; and
fuse images captured by the at least one camera dedicated to sampling luma and the cameras dedicated to sampling chroma to produce an image; and
wherein the image processing pipeline module is configured to select at least one distance as an “in best focus” distance and blur the produced image based upon the depth map.
29. A camera array, comprising:
a plurality of cameras formed on separate semiconductor substrates and mounted to a motherboard, where each camera comprises:
optics comprising at least one lens element and at least one aperture; and
a sensor comprising a two dimensional array of pixels and control circuitry for controlling imaging parameters;
a controller configured to control operation parameters of the linear array of cameras; and
an image processing pipeline module;
wherein the linear array of cameras includes at least one camera dedicated to sampling luma and cameras dedicated to sampling chroma;
wherein a camera dedicated to sampling luma forms a central camera and the cameras that sample chroma are arranged symmetrically within the linear array on either side of the central camera to address occlusion due to parallax;
wherein the image processing pipeline module is configured to:
measure parallax using images captured by the linear array of cameras to produce a depth map; and
fuse images captured by the at least one camera dedicated to sampling luma and the cameras dedicated to sampling chroma to produce an image; and
wherein the image processing pipeline module is configured to select at least one distance as an “in best focus” distance and blur the produced image based upon the depth map.