Unified image processing for combined images based on spatially co-located zones
A unified image processing algorithm results in better post-processing quality for combined images that are made up of multiple single-capture images. To ensure that each single-capture image is processed in the context of the entire combined image, the combined image is analyzed to determine portions of the image (referred to as “zones”) that should be processed with the same parameters for various image processing algorithms. These zones may be determined based on the content of the combined image. Alternatively, these zones may be determined based on the position of each single-capture image with respect to the entire combined image or the other single-capture images. Once zones and their corresponding image processing parameters are determined for the combined image, they are translated to corresponding zones each of the single-capture images. Finally, the image processing algorithms are applied to each of the single-capture images using the zone-specified parameters.
1. A method comprising:
accessing a plurality of images synchronously captured by a multi-camera array;
combining the plurality of images to form a combined image;
determining a first plurality of zones for the combined image, each zone of the first plurality of zones encompassing a portion of the combined image, wherein no two zones of the first plurality of zones overlap;
projecting one of the first plurality of zones onto at least two of the plurality of images to determine two or more projected zones in respective images of the plurality of images;
performing an image processing operation with a first set of one or more parameters in the two or more projected zones of the plurality of images; and
performing the image processing operation with a second set of one or more parameters in a different zone of the plurality of images, wherein the second set of one or more parameters is different from the first set of one or more parameters.
2. The method of claim 1 , further comprising:
identifying one or more image features in the combined image.
3. The method of claim 2 , wherein each zone in the first plurality of zones corresponds to an identified image feature.
4. The method of claim 3 , wherein at least one of the plurality of zones fully encompasses one of the one or more image features.
5. The method of claim 1 , wherein the first plurality of zones are determined spatially.
6. The method of claim 1 , wherein the first plurality of zones is determined based on depth information corresponding to the combined image.
7. The method of claim 1 , wherein the first plurality of zones is determined based on a position of an image of the plurality of images on an image sensor of the multi-camera array.
8. The method of claim 1 , wherein the first plurality of zones is determined based on relative locations of cameras capturing the plurality of images in the multi-camera array.
9. The method of claim 1 , wherein the first plurality of zones is determined based on one or more lens parameters chosen from the group of: directionality, orientation, point of view, field of view, and allowed luminance.
10. The method of claim 1 , wherein the first plurality of zones is determined based on external sensor data comprising at least one of gyroscope, accelerometer, GPS, and altimeter data.
11. The method of claim 1 , further comprising:
mapping each of the first plurality of zones in the combined image to one or more zones in the plurality of images.
12. The method of claim 11 , wherein a same image processing operation is performed on overlapping zones in the plurality of images.
13. The method of claim 1 , further comprising:
determining the first set of one or more parameters based on a property of the one of the first plurality of zones.
14. The method of claim 1 , further comprising:
after performing the image processing operation, re-combining the plurality of images based on overlapping regions of the plurality of images to produce a processed combined image.
15. A system comprising:
a processor; and
a non-transitory computer-readable medium comprising instructions that when executed by the processor cause the processor to:
access a plurality of images synchronously captured by a multi-camera array;
combine the plurality of images to form a combined image;
determine a first plurality of zones for the combined image, each zone of the first plurality of zones encompassing a portion of the combined image, wherein no two zones of the first plurality of zones overlap;
project one of the first plurality of zones onto at least two of the plurality of images to determine two or more projected zones in respective images of the plurality of images;
perform an image processing operation with a first set of one or more parameters in the two or more projected zones of the plurality of images; and
perform the image processing operation with a second set of one or more parameters in a different zone of the plurality of images, wherein the second set of one or more parameters is different from the first set of one or more parameters.
16. The system of claim 15 , wherein the instructions further cause the processor to: identify one or more image features in the combined image.
17. The system of claim 16 , wherein each zone in the first plurality of zones corresponds to an identified image feature.
18. The system of claim 17 , wherein at least one of the plurality of zones fully encompasses one of the one or more image features.
19. The system of claim 15 , wherein the first plurality of zones are determined spatially.
20. The system of claim 15 , wherein the first plurality of zones is determined based on depth information corresponding to the combined image.
21. The system of claim 15 , wherein the instructions further cause the processor to: map each of the first plurality of zones in the combined image to one or more zones in the plurality of images.
22. The system of claim 21 , wherein a same image processing operation is performed on overlapping zones in the plurality of images.
23. The system of claim 15 , wherein the instructions further cause the processor to:
determine the first set of one or more parameters based on a property of the one of the first plurality of zones.
24. The system of claim 15 , wherein the instructions further cause the processor to:
after performing the image processing operations, re-combine the plurality of images based on overlapping regions of the plurality of images to produce a processed combined image.
25. A non-transitory computer-readable medium comprising instructions that when executed by a processor cause the processor to:
access a plurality of images synchronously captured by a multi-camera array;
combine the plurality of images to form a combined image;
determine a first plurality of zones for the combined image, each zone of the first plurality of zones encompassing a portion of the combined image, wherein no two zones of the first plurality of zones overlap;
project one of the first plurality of zones onto at least two of the plurality of images to determine two or more projected zones in respective images of the plurality of images;
perform an image processing operation with a first set of one or more parameters in the two or more projected zones of the plurality of images; and
perform the image processing operation with a second set of one or more parameters in a different zone of the plurality of images, wherein the second set of one or more parameters is different from the first set of one or more parameters.