Methods and Systems for Adaptive Dither Pattern Processing

An image display device comprising:

• a. a first multi-dimensional array of dither pattern tiles, said array comprising a first lower temporal frequency bound;
• b. a second multi-dimensional array of dither pattern tiles, said array comprising a second lower temporal frequency bound, wherein said second lower temporal frequency bound is lower than said first lower temporal frequency bound;
• c. wherein said first multi-dimensional array of dither pattern tiles is associated with a first range of local luminance characteristic values;
• d. wherein said second multi-dimensional array of dither pattern tiles is associated with a second range of local luminance characteristic values.
• e. a determiner for determining a local luminance characteristic for a plurality of tile block locations in a digital image;
• f. a selector for selecting a dither pattern tile from said first multi-dimensional array of dither pattern tiles for application on at least one of said tile block locations when said at least one of said tile block locations has a local luminance characteristic value that falls within said first range and for selecting a dither pattern tile from said second multi-dimensional array of dither pattern tiles for application on at least one of said tile block locations when said at least one of said tile block locations has a local luminance characteristic value that falls within said second range.

An image display device comprising:

• a. image storage for storing an image to be displayed;
• b. a dither array storage having contents comprising
• i. a first multi-dimensional array of dither pattern tiles, said array comprising a first upper horizontal spatial frequency bound, a first lower horizontal frequency bound, a first upper vertical spatial frequency bound, a first lower vertical spatial frequency bound, a first upper temporal frequency bound and a first lower temporal frequency bound, wherein said first multi-dimensional array is associated with a first range of local luminance characteristic values;
• and
• ii. a second multi-dimensional array of dither pattern tiles, said array comprising a second upper horizontal spatial frequency bound, a second lower horizontal frequency bound, a second upper vertical spatial frequency bound, a second lower vertical spatial frequency bound, a second upper temporal frequency bound and a second lower temporal frequency bound, wherein said second lower temporal frequency bound is lower than said first lower temporal frequency bound, wherein said second multi-dimensional array is associated with a second range of local luminance characteristic values;
• c. a processor for determining a local luminance characteristic value for an image location;
• and
• d. a selector for selecting between said first array and said second array based on the local luminance characteristic value for said image location.