Image processing according to an encoder mapping between image region size in input and encoded images

1. A method of encoding an input image captured using a wide-angle lens, the method comprising:

for at least some of a set of image regions, increasing or decreasing by one or more processors a size of the at least some of the set of image regions relative to other ones of the set of image regions according to an encoder mapping between image region size in the input image and image region size in an encoded image.

2. A method according to claim 1 , comprising the step of:

applying an image correction to the input image to compensate for image distortions caused by the wide-angle lens.

3. A method according to claim 2 , in which the applying step is configured to generate a corrected image having a higher pixel resolution than the input image.

4. A method according to claim 1 , in which the encoder mapping is such that one or more central image regions is increased in size and one or more peripheral image regions is decreased in size.

5. A method according to claim 1 , further comprising the step of providing metadata indicative of a division of the captured input image into set of image regions.

6. A method according to claim 1 , further comprising the step of providing metadata indicative of the increase or decrease in size of at least some of the image regions.

7. A method according to claim 1 , in which the step of increasing or decreasing the size comprises dynamically varying the increase or decrease in size according to one or both of content and viewpoint of the captured image.

8. A method according to claim 1 , further comprising dynamically varying a division of the captured image into image regions according to one or both of content and viewpoint of the captured image.

9. A decoding method for decoding an image encoded by increasing or decreasing a size of the at least some of a set of image regions relative to other ones of the set of image regions according to an encoder mapping between image region size in an input image and image region size in an encoded image, the decoding method comprising:

rendering, by one or more processors, a given image according to a decoder mapping between selected regions of the encoded image and selected regions of a rendered image, the decoder mapping being complimentary to the encoder mapping.

10. A machine-readable non-transitory storage medium having computer readable instructions stored thereon, the instructions, when executed by one or more processors, causes the processors to perform a method of encoding an input image captured using a wide-angle lens, the method comprising:

for at least some of a set of image regions, increasing or decreasing a size of the at least some of the set of image regions relative to other ones of the set of image regions according to an encoder mapping between image region size in the input image and image region size in an encoded image.

11. The machine-readable non-transitory storage medium of claim 10 , wherein the method further comprises rendering a given image according to a decoder mapping between selected regions of the encoded image and selected regions of a rendered image, the decoder mapping being complimentary to the encoder mapping.

12. Image encoding apparatus configured to encode an input image captured using a wide-angle lens, the image encoding apparatus comprising:

an encoder configured, for at least some of a set of image regions, to increase or decrease a size of the at least some of the set of image regions relative to other ones of the set of image regions according to an encoder mapping between image region size in the input image and image region size in an encoded image.

13. Image decoding apparatus configured to decode an image encoded by increasing or decreasing a size of the at least some of a set of image regions relative to other ones of the set of image regions according to an encoder mapping between image region size in an input image and image region size in an encoded image, the image decoding apparatus comprising:

an image renderer configured to render a given image according to a decoder mapping between selected regions of the encoded image and selected regions of a rendered image, the decoder mapping being complimentary to the encoder mapping.