Systems and methods for encoding image files containing depth maps stored as metadata
Systems and methods in accordance with embodiments of the invention are configured to render images using light field image files containing an image synthesized from light field image data and metadata describing the image that includes a depth map. One embodiment of the invention includes a processor and memory containing a rendering application and a light field image file including an encoded image, a set of low resolution images, and metadata describing the encoded image, where the metadata comprises a depth map that specifies depths from the reference viewpoint for pixels in the encoded image. In addition, the rendering application configures the processor to: locate the encoded image within the light field image file; decode the encoded image; locate the metadata within the light field image file; and post process the decoded image by modifying the pixels based on the depths indicated within the depth map and the set of low resolution images to create a rendered image.
1. An image processing system, comprising:
a processor; and
memory containing an encoding application;
wherein the encoding application configures the processor to:
obtain image data, where the image data comprises a plurality of images of a scene captured from different viewpoints;
create a depth map that specifies depths for pixels in a reference image using at least a portion of the image data;
synthesize an image using at least one of the images in the plurality of images of a scene captured from different viewpoints and the depth map;
apply a blur effect to the synthesized image; and
store an image file comprising the reference image, the synthesized image and the depth map in the memory, where the image file comprises an application marker segment, and the depth map is stored as metadata within the application marker segment.
2. The system of claim 1 , wherein the encoding application configures the processor to encode the depth map.
3. The system of claim 1 , wherein the encoding application configures the processor to:
identify pixels in the plurality of images of the scene that are occluded in the reference image; and
the metadata includes descriptions of occluded pixels.
4. The system of claim 3 , wherein the descriptions of the occluded pixels include colors, locations, and depths of the occluded pixels.
5. The system of claim 1 , wherein the encoding application configures the processor to:
create a confidence map for the depth map, where the confidence map indicates the reliability of the depth value for a pixel in the depth map; and the metadata further includes the confidence map.
6. The system of claim 5 , wherein the encoding application configures the processor to encode the confidence map.
7. The system of claim 1 , wherein:
the encoding application configures the processor to generate an edge map that indicates pixels in the reference image that lie on a discontinuity; and
the metadata further includes the edge map.
8. The system of claim 7 , wherein the edge map identifies whether a pixel lies on an intensity discontinuity.
9. The system of claim 7 , wherein the edge map identifies whether a pixel lies on an intensity and depth discontinuity.
10. The system of claim 7 , wherein the encoding application configures the processor to encode the edge map.
11. The system of claim 1 , wherein:
the encoding application configures the processor to generate a missing pixel map that indicates pixels in the reference image that do not correspond to a pixel from the plurality of images of the scene; and
the metadata further includes the missing pixels map.
12. The system of claim 11 , wherein the encoding application configures the processor to encode the missing pixels map.
13. The system of claim 1 , wherein at least one of the plurality of images is captured from a viewpoint that is separate and distinct from a viewpoint of the reference image.
14. The system of claim 1 , wherein the image file conforms to the JPEG File Interchange Format (JFIF) standard.
15. The system of claim 1 , wherein the reference image is encoded in accordance with the JPEG standard.
16. The system of claim 1 , wherein the application marker segment is identified using an APP9 marker.
17. The system of claim 1 , wherein the encoding application configures the processor to encode the depth map in accordance with the JPEG standard using lossless compression and an encoded depth map is stored within the application marker segment containing the metadata.
18. A method for encoding an image, comprising:
obtaining image data, where the image data comprises a plurality of images of a scene captured from different viewpoints;
creating a depth map that specifies depths for pixels in a reference image using at least a portion of the image data;
synthesizing an image using at least one of the images in the plurality of images of a scene captured from different viewpoints and the depth map;
applying a blur effect to the synthesized image; and
storing an image file in a memory comprising the reference image, the synthesized image and the depth map in the memory, where the image file comprises an application marker segment, and the depth map is stored as metadata within the application marker segment.
19. The method of claim 18 , further comprising encoding the depth map.
20. The method of claim 18 , wherein the image file conforms to the JPEG File Interchange Format (JFIF) standard.