Method and system for interpolating index values of associated tiles in an image

A method for indexing as executed by an image decoder of a processor, comprising:

• identifying a tile in an image, wherein said image comprises a plurality of tiles, wherein each tile includes color data associated with a plurality of pixels;
• partitioning a rectangular grid into a first index value and a second index value configured in a specified pattern;
• applying said rectangular grid to said tile for purposes of determining index values for pixels in said tile;
• identifying a pixel in said tile;
• and
• determining a corresponding index value for said pixel according to said specified pattern.

A non-transitory computer-readable medium having computer-executable instructions for performing a method for indexing, comprising:

• identifying a tile in an image, wherein said image comprises a plurality of tiles, wherein each tile includes color data associated with a plurality of pixels;
• asymmetrically providing a plurality of indices throughout said tile;
• identifying a pixel in said tile;
• determining a corresponding rectangular grid including said pixel, wherein said corresponding rectangular grid comprises a group of four indices;
• and
• determining an index for said pixel by bilinearly filtering said group of indices in relation to said pixel.