Splitting of elliptical images
A method of splitting of elliptical images performed by a processor is provided. The method includes: receiving an image whose pixels span a range along each of two orthogonal axes; segmenting the image into indexed sub-images; storing the sub-images as texture maps; responding to a request for a value of a texture element having S 1 , T 1 and H coordinates by returning the value of the texture element of the sub-image indexed by H whose X and Y coordinates are S 1 and T 1.
1. A method performed by a GPU, comprising:
receiving at the GPU, an image whose pixels span a range along each of two orthogonal axes;
segmenting, by the GPU, the image into indexed sub-images;
storing, by the GPU, the sub-images as texture maps;
responding, by the GPU, to a request for a value of a texture element having S 1 , T 1 and H coordinates by returning the value of the texture element of the sub-image indexed by H whose X and Y coordinates are S 1 and T 1 .
2. The method defined in claim 1 , wherein segmenting is done according to maximum GPU size.
3. The method defined in claim 1 , wherein segmenting is done according to powers of two.
4. The method defined in claim 1 , wherein the image is a panoramic image.
5. The method defined in claim 1 , wherein the pixels of the image define an ellipse.
6. The method defined in claim 1 , wherein the pixels of the image define an circle.
7. A method performed by a CPU, comprising:
receiving at the CPU, a request for a value of a texture element having S and T coordinates;
transforming, by the CPU, the S and T coordinates into S 1 , T 1 and H coordinates, where S 1 and T 1 denote X and Y coordinates within a sub-texture indexed by H;
sending, by the CPU, a request to a GPU for a value of a texture element having S 1 , T 1 and H coordinates;
receiving, by the CPU from the GPU, the value of the texture element of the sub-texture indexed by H whose X and Y coordinates are S 1 and T 1 .
8. The method defined in claim 7 , wherein the request is received from a requesting function, the method further comprising returning the received value of the texture element to the requesting function.
9. The method defined in claim 7 , wherein the sub-texture is a sub-image obtained from an original image through segmentation.
10. The method defined in claim 9 , wherein the original image is an elliptical panoramic image.
11. A non-transitory computer-readable medium comprising instructions which, when executed by a GPU, cause the GPU to carry out a method that comprises:
receiving an image whose pixels span a range along each of two orthogonal axes;
segmenting the image into indexed sub-images;
storing the sub-images as texture maps;
responding to a request for a value of a texture element having S 1 , T 1 and H coordinates by returning the value of the texture element of the sub-image indexed by H whose X and Y coordinates are S 1 and T 1 .
12. A non-transitory computer-readable medium comprising instructions which, when executed by a CPU, cause the CPU to carry out a method that comprises:
receiving a request for a value of a texture element having S and T coordinates;
transforming the S and T coordinates into S 1 , T 1 and H coordinates, where S 1 and T 1 denote X and Y coordinates within a sub-texture indexed by H;
sending a request to a GPU for a value of a texture element having S 1 , T 1 and H coordinates;
receiving from the GPU the value of the texture element of the sub-texture indexed by H whose X and Y coordinates are S 1 and T 1 .