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. 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; 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.
2. The method of claim 1 , further comprising applying a blur effect to the synthesized image.
3. The method of claim 1 , further comprising encoding the depth map.
4. The method of claim 1 , further comprising identifying pixels in the plurality of images of the scene that are occluded in the reference image; wherein the metadata includes descriptions of occluded pixels.
5. The method of claim 4 , wherein the descriptions of the occluded pixels include colors, locations, and depths of the occluded pixels.
6. The method of claim 1 , further comprising creating a confidence map for the depth map, where the confidence map indicates a reliability of a depth value for a pixel in the depth map; and wherein the metadata further includes the confidence map.
7. The method of claim 6 , further comprising encoding the confidence map.
8. The method of claim 1 , further comprising generating an edge map that indicates pixels in the reference image that lie on a discontinuity; and wherein the metadata further includes the edge map.
9. The method of claim 8 , wherein the edge map identifies whether a pixel lies on an intensity discontinuity.
10. The method of claim 8 , wherein the edge map identifies whether a pixel lies on an intensity and depth discontinuity.
11. The method of claim 8 , further comprising encoding the edge map.
12. The method of claim 1 , further comprising generating 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 wherein the metadata further includes the missing pixels map.
13. The method of claim 12 , further comprising encoding the missing pixels map.
14. The method 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.
15. The method of claim 1 , wherein the image file conforms to the JPEG File Interchange Format (JFIF) standard.
16. The method of claim 1 , wherein the reference image is encoded in accordance with the JPEG standard.
17. The method of claim 1 , wherein the application marker segment is identified using an APP9 marker.
18. The method of claim 1 , further comprising encoding the depth map in accordance with the JPEG standard using lossless compression and wherein the encoded depth map is stored within the application marker segment containing the metadata.