Fast image resolution enhancement with de-pixeling

Apparatus, comprising:

• a computer-readable medium storing computer-readable instructions;
• and
• a data processor coupled to the computer-readable medium, operable to execute the instructions, and based at least in part on the execution of the instructions operable to perform operations comprising
• processing source pixels of the source image with a set of linear non-separable filter kernels to produce the output image with a corresponding output pixel block of constituent output pixels for each of the source pixels;
• wherein the set of filter kernels has a mean substantially equal to an identity filter such that a downscaling of the output image to a resolution level of the source image produces a downscaled image that is substantially identical to the source image;
• and
• wherein the processing comprises for each of the source pixels, applying each of the filter kernels in the set to a local neighborhood of the source pixel to produce a respective value of each of the constituent output pixels of the corresponding output pixel block.

At least one computer-readable medium having computer-readable program code embodied therein, the computer-readable program code adapted to be executed by a computer to implement a method comprising:

• processing source pixels of the source image with a set of linear non-separable filter kernels to produce the output image with a corresponding output pixel block of constituent output pixels for each of the source pixels;
• wherein the set of filter kernels has a mean substantially equal to an identity filter such that a downscaling of the output image to a resolution level of the source image produces a downscaled image that is substantially identical to the source image;
• and
• wherein the processing comprises for each of the source pixels, applying each of the filter kernels in the set to a local neighborhood of the source pixel to produce a respective value of each of the constituent output pixels of the corresponding output pixel block.