Vignetting of foveated display content systems and methods

Image processing circuitry comprising:

• processing block circuitry configured to generate display image data based on an image frame of multi-resolution image data, wherein the image frame is divided into a plurality of regions having respective resolutions of a plurality of resolutions;
• and
• vignetting block circuitry configured to generate the display image data based on the multi-resolution image data by:
• determining boundary data indicative of first locations of boundaries between the plurality of regions;
• obtaining grid line data indicative of second locations of grid lines of a vignetting grid, wherein the vignetting grid comprises a plurality of grid points corresponding to vignetting values;
• determining a phase offset of a pixel grouping corresponding to a relative distance between the pixel grouping and a grid line of the grid lines based on the grid line data and the boundary data;
• determining a relative location of the pixel grouping with respect to a set of grid points of the plurality of grid points based on the phase offset;
• interpolating between the vignetting values corresponding to the set of grid points to generate vignetting data based on the relative location;
• and
• applying the vignetting data to the multi-resolution image data of the pixel grouping.

A non-transitory machine-readable medium comprising instructions, wherein, when executed by one or more processors, the instructions cause the one or more processors to perform operations or to control image processing circuitry to perform the operations, wherein the operations comprise:

• determining boundary data indicative of first locations of boundaries between a plurality of regions that define areas of different content resolutions of an image frame of multi-resolution image data;
• determining vignetting data to be applied to a pixel grouping of the multi-resolution image data, wherein determining the vignetting data to be applied to the pixel grouping comprises:
• determining a phase offset of the pixel grouping, wherein the phase offset comprises a relative distance between the pixel grouping and a grid line of a vignetting grid, wherein the vignetting grid comprises a plurality of grid points corresponding to vignetting values;
• determining a relative location of the pixel grouping with respect to a set of grid points of the plurality of grid points based on the phase offset;
• interpolating between the vignetting values corresponding to the set of grid points to generate the vignetting data based on the relative location;
• and
• applying the vignetting data to the multi-resolution image data of the pixel grouping.