Tile map based multi-level supercell screening
AssigneeTexas Instruments Incorporated
InventorVivek Kumar Thakur
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Abstract
This invention is a screening method. The input image is divided into a plurality of supercells. These supercells are divided into a plurality of individual cells. An expanded cell is defined larger than each of the individual cells. A map of an input gray scale tone to an output gray scale tone is defined for each pixel of the expanded cell. The screening takes place for each pixel of the input image. First the method determines a pixel of the expanded cell corresponding to the input pixel. Then the output gray scale tone corresponding to the pixel of the expanded cell is recalled.
Claims4
A method of approximating a gray scale tone in an input image with a different range image producer comprising the steps of:
- dividing the input image into a plurality of supercells;
- dividing each supercell into a plurality of individual cells;
- defining an expanded cell larger that each of the individual cells;
- defining a mapping of an input gray scale tone to an output gray scale tone for each pixel of the expanded cell;
- for each pixel of the input image
- determining a pixel of the expanded cell corresponding to the input pixel;
- determining an output gray scale tone corresponding to the pixel input gray scale tone and the corresponding pixel of the expanded cell.
Dependencies are inferred from the claim text.