Determining image alignment failure
First Claim
1. A method comprising:
- obtaining, by a computing device, a first set of pixels of a short exposure image and a second set of pixels of a long exposure image, wherein the short exposure image was captured using a short total exposure time (TET) and the long exposure image was captured using a long TET, wherein the long TET is greater than the short TET;
aligning the first set of pixels and the second set of pixels such that pixels in the first set of pixels are pairwise matched with pixels in the second set of pixels;
comparing a first pixel value to a second pixel value, wherein the first pixel value is of a first pixel in the first set of pixels, the second pixel value is of a second pixel in the second set of pixels, and the first pixel and second pixel are pairwise matched;
based on the comparison of the first pixel value to the second pixel value, determining an alignment error value for the first pixel and the second pixel;
determining a global alignment error value, wherein the alignment error value for the first pixel and the second pixel contributes to the global alignment error value;
determining that the global alignment error value is greater than a threshold tolerance;
based on the global alignment error value being greater than the threshold tolerance, determining that the alignment of the short exposure image and the long exposure image has failed;
obtaining a fallback exposure image, wherein the fallback exposure image was captured using a fallback TET, and wherein the fallback TET is between the short TET and the long TET; and
in response to determining that the alignment of the short exposure image and the long exposure image has failed, providing at least the fallback exposure image as an output image.
2 Assignments
0 Petitions
Accused Products
Abstract
A first set of pixels of a short exposure image and a second set of pixels of a long exposure image may be obtained. The short exposure image may have been captured using a short total exposure time (TET) and the long exposure image may have been captured using a long TET. The long TET may be greater than the short TET. The first set of pixels and the second set of pixels may be aligned. A first pixel value of a first pixel in the first set of pixels and a second pixel of a second pixel in the second set of pixels value may be compared. Based on the comparison, an alignment error value for the first pixel and the second pixel may be determined. Based at least on the alignment error value, an output image may be provided.
107 Citations
12 Claims
-
1. A method comprising:
-
obtaining, by a computing device, a first set of pixels of a short exposure image and a second set of pixels of a long exposure image, wherein the short exposure image was captured using a short total exposure time (TET) and the long exposure image was captured using a long TET, wherein the long TET is greater than the short TET; aligning the first set of pixels and the second set of pixels such that pixels in the first set of pixels are pairwise matched with pixels in the second set of pixels; comparing a first pixel value to a second pixel value, wherein the first pixel value is of a first pixel in the first set of pixels, the second pixel value is of a second pixel in the second set of pixels, and the first pixel and second pixel are pairwise matched; based on the comparison of the first pixel value to the second pixel value, determining an alignment error value for the first pixel and the second pixel; determining a global alignment error value, wherein the alignment error value for the first pixel and the second pixel contributes to the global alignment error value; determining that the global alignment error value is greater than a threshold tolerance; based on the global alignment error value being greater than the threshold tolerance, determining that the alignment of the short exposure image and the long exposure image has failed; obtaining a fallback exposure image, wherein the fallback exposure image was captured using a fallback TET, and wherein the fallback TET is between the short TET and the long TET; and in response to determining that the alignment of the short exposure image and the long exposure image has failed, providing at least the fallback exposure image as an output image. - View Dependent Claims (2, 3, 4)
-
-
5. An article of manufacture including a non-transitory computer-readable medium, having stored thereon program instructions that, upon execution by a computing device, cause the computing device to perform operations comprising:
-
obtaining a first set of pixels of a short exposure image and a second set of pixels of a long exposure image, wherein the short exposure image was captured using a short total exposure time (TET) and the long exposure image was captured using a long TET, wherein the long TET is greater than the short TET; aligning the first set of pixels and the second set of pixels such that pixels in the first set of pixels are pairwise matched with pixels in the second set of pixels; comparing a first pixel value to a second pixel value, wherein the first pixel value is of a first pixel in the first set of pixels, the second pixel value is of a second pixel in the second set of pixels, and the first pixel and second pixel are pairwise matched; based on the comparison of the first pixel value to the second pixel value, determining an alignment error value for the first pixel and the second pixel; determining a global alignment error value, wherein the alignment error value for the first pixel and the second pixel contributes to the global alignment error value; determining that the global alignment error value is greater than a threshold tolerance; based on the global alignment error value being greater than the threshold tolerance, determining that the alignment of the short exposure image and the long exposure image has failed; obtaining a fallback exposure image, wherein the fallback exposure image was captured using a fallback TET, and wherein the fallback TET is between the short TET and the long TET; and in response to determining that the alignment of the short exposure image and the long exposure image has failed, providing at least the fallback exposure image as an output image. - View Dependent Claims (6, 7, 8)
-
-
9. A computing device comprising:
-
at least one processor; data storage; and program instructions, stored in the data storage, that upon execution by the at least one processor cause the computing device to perform operations including; obtaining a first set of pixels of a short exposure image and a second set of pixels of a long exposure image, wherein the short exposure image was captured using a short total exposure time (TET) and the long exposure image was captured using a long TET, wherein the long TET is greater than the short TET; aligning the first set of pixels and the second set of pixels such that pixels in the first set of pixels are pairwise matched with pixels in the second set of pixels; comparing a first pixel value to a second pixel value, wherein the first pixel value is of a first pixel in the first set of pixels, the second pixel value is of a second pixel in the second set of pixels, and the first pixel and second pixel are pairwise matched; based on the comparison of the first pixel value to the second pixel value, determining an alignment error value for the first pixel and the second pixel; determining a global alignment error value, wherein the alignment error value for the first pixel and the second pixel contributes to the global alignment error value; determining that the global alignment error value is greater than a threshold tolerance; based on the global alignment error value being greater than the threshold tolerance, determining that the alignment of the short exposure image and the long exposure image has failed; obtaining a fallback exposure image, wherein the fallback exposure image was captured using a fallback TET, and wherein the fallback TET is between the short TET and the long TET; and in response to determining that the alignment of the short exposure image and the long exposure image has failed, providing at least the fallback exposure image as an output image. - View Dependent Claims (10, 11, 12)
-
Specification