Apparatus, method, and product for downscaling an image
AssigneeMicron Technology, Inc.
InventorBurton Wright
Life of this patent
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Abstract
An average filter or filters is used in line with the output of an interpolation filter to downscale an image. The interpolation filter upscales a source image or bitmap of pixels into an intermediate form and the average filter or filters downscales the intermediate form to a destination image or bitmap of pixels. This configuration incorporates a small amount of logic with a relatively low incremental cost, enabling high quality downscaling of text and computer graphics content. The invention achieves quality comparable to a filter/scalar combination with more taps or a separate decimation pass.
Claims33
An apparatus for scaling image data, comprising:
- an interpolation filter to upscale a source image to an intermediate image;
- and
- an average filter to downscale the intermediate image to a destination image.
An apparatus for scaling a source image to a destination image, comprising:
- an interpolation filter, wherein the interpolation filter is to upscale the source image to an intermediate image, wherein the intermediate image has a size equal to a size of the destination image adjusted by a scale factor;
- and
- an average filter to downscale the intermediate image to the destination image.
An apparatus for scaling image data, comprising:
- a bilinear interpolation filter to upscale a source image to an intermediate image by a scale factor;
- and
- an average filter to downscale the intermediate image to a destination image.
Dependencies are inferred from the claim text.