High dynamic range image mapping with empirical mode decomposition
View Patent ↗The disclosure relates generally to receiving original image data, decomposing the original image data into layers, compressing a dynamic range of each of layers, and integrating compressed layers to form a final image.
1. A method comprising:
receiving original image data;
decomposing, using an empirical mode decomposition (EMD) transform, the original image data into a plurality of layers by decomposing a signal, which represents the original image data, into basis functions that are adapted from the signal;
compressing a dynamic range of each of the plurality of layers, wherein the compressing for a respective layer of the plurality of layers is performed using a compression ratio that is directly proportional with an intensity amplitude of the respective layer, wherein details of the respective layer with a small intensity amplitude can be retained; and
integrating, using a reverse EMD transform, the plurality of compressed layers to form a final image.
2. The method of claim 1 , wherein each of the plurality of layers encodes information of different frequency ranges of intensity.
3. The method of claim 2 , wherein the compressing the dynamic range includes compressing an intensity dynamic range of each of the plurality of layers.
4. The method of claim 2 , wherein the compressing the dynamic range further comprises:
determining the dynamic range of a display device; and
compressing the dynamic range of each of the plurality of layers wherein the final image has a dynamic range within the dynamic range of the display device.
5. The method of claim 1 , wherein the EMD transform includes a Hilbert Huang Transform.
6. The method of claim 1 , wherein at least one of the plurality of layers is compressed with a different compression ratio than another of the plurality of layers.
7. An apparatus for high dynamic range mapping of image data comprising:
a receiver configured to receive original image data;
a decomposition unit configured to decompose the original image data into a plurality of layers using an empirical mode decomposition (EMD) transform;
a compression unit configured to compress a dynamic range of each of the plurality of layers, wherein the compression unit compresses a respective layer of the plurality of layers using a compression ratio that is directly proportional with an intensity amplitude of the respective layer, wherein details of the respective layer with a small intensity amplitude can be retained; and
an integrating unit configured to integrate the plurality of compressed layers to form a final image using a reverse EMD transform.
8. The apparatus of claim 7 , wherein each of the plurality of layers encodes information of different frequency ranges of intensity.
9. The apparatus of claim 8 , wherein the compression unit compresses an intensity dynamic range of each of the plurality of layers.
10. The apparatus of claim 8 , wherein the compression unit is further configured to:
determine the dynamic range of a display device; and
compress the dynamic range of each of the plurality of layers wherein the final image has a dynamic range within the dynamic range of the display device.
11. The apparatus of claim 7 , wherein the EMD transform includes a Hilbert Huang Transform.
12. The apparatus of claim 7 , wherein at least one of the plurality of layers is compressed with a different compression ratio than another of the plurality of layers.
13. The apparatus of claim 7 , wherein the decomposition unit decomposes the original image data into a plurality of layers by decomposing a signal representing the original image data into basis functions that are adapted from the signal.
14. A non-transitory computer-readable medium, storing a set of instructions, executed by a processor, to perform a method comprising:
receiving original image data;
decomposing the original image data into a plurality of layers using an empirical model decomposition (EMD) transform;
compressing a dynamic range of each of the plurality of layers, wherein the compressing for a respective layer of the plurality of layers is performed using a compression ratio that is directly proportional with an intensity amplitude of the respective layer, wherein details of the respective layer with a small intensity amplitude can be retained; and
integrating the plurality of compressed layers to form a final image using a reverse EMD transform.
15. The non-transitory computer-readable medium of claim 14 , wherein each of the plurality of layers encodes information of different frequency ranges of intensity.
16. The non-transitory computer-readable medium of claim 15 , wherein the compressing the dynamic range compresses an intensity dynamic range of each of the plurality of layers.
17. The non-transitory computer-readable medium of claim 15 , wherein compressing the dynamic range further comprises:
determining the dynamic range of a display device; and
compressing the dynamic range of each of the plurality of layers wherein the final image has a dynamic range within the dynamic range of the display device.
18. The non-transitory computer-readable medium of claim 14 , wherein the EMD transform includes a Hilbert Huang Transform.
19. The non-transitory computer-readable medium of claim 14 , wherein at least one of the plurality of layers is compressed with a different compression ratio than another of the plurality of layers.
20. The non-transitory computer-readable medium of claim 14 , wherein the decomposing the original image data includes decomposing a signal representing the original image data into basis functions that are adapted from the signal.