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US 7,545,391 B2Granted
Content adaptive resizer
AssigneeAlgolith Inc.
InventorsChon Tam Le Dinh, Ngoc Lan Nguyen
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Abstract
The present description discloses a method for resizing an input image having input pixels. The method comprises segmenting the input made into region types by assigning one of the region types to each one of the input pixels; and interpolating the input image according to the region type assigned to each one of the input pixels to produce a resized image having interpolated pixels.
Claims16
A method for resizing an input image having input pixels, said method comprising:
- segmenting said input image into region types by assigning one of said region types to each one of said input pixels;
- and
- interpolating said input image according to the region type assigned to each one of said input pixels to produce a resized image having interpolated pixels and wherein said region types are defined using a frequency value for said input pixels and a direction value for said input pixels;
- further wherein said region types comprise an Edge (E) region type, a Near-Edge (NE) region type, a Texture (T) region type and a Flat (F) region type;
- further wherein said interpolating comprises hardware logic for non-linear polyphase filtering pixels assigned to at least one of Edge and Near-Edge region types and linear polyphase filtering pixels assigned to at least one of Texture (T) and Flat (F) region types.
2 more elements
An apparatus for resizing an input image having input pixels, said apparatus comprising:
- a segmentation unit for segmenting said input image into region types by assigning one of said region types to each one of said input pixels;
- an interpolating unit comprising a polyphase filter for filtering said input pixels according to the region type assigned to each one of said input pixels to produce a resized image having interpolated pixels and wherein said region types are defined using a frequency value for said input pixels and a direction value for said input pixels;
- and a FIR low-pass filter having a fixed cutoff frequency having FIR filter coefficients;
- and wherein said interpolating unit further comprises a phase selector for selecting at least some of said FIR filter coefficients for use in said polyphase filtering;
- further wherein a resizing ratio is defined by the relationship U/D, where U is the upscale resizing parameter and D is the downscale resizing parameter, and further wherein said interpolating unit is further using said U and said D for subdividing said FIR low-pass filter coefficients into polyphase filter coefficients used for said polyphase filtering.
2 more elements
Dependencies are inferred from the claim text.