Image resizing system and method
AssigneeTexas Instruments Incorporated
InventorPhilippe Lafon
Life of this patent
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Abstract
Image resizing through resampling by poly-phase filtering with a phase generation from input parameters but with lower resolution of the phase for filter selection. Field and frame mode selection creates initial offsets for alignment. A phase accumulator generates sample addressing with its most significant bits, generates filter selection with its middle bits, and maintains its least significant bits for accuracy.
Claims5
A method of sampling rate conversion which uses poly-phase filtering, the improvement comprising:
- (a) generating a phase with a first resolution;
- and
- (b) selecting poly-phase filters using said phase at a second resolution which is coarser than said first resolution.
A method of image resampling which uses horizontal and vertical poly-phase filtering, the improvement comprising:
- (a) generating a phase at a first resolution using input parameters;
- (b) selecting poly-phase filters from said phase for horizontal filtering to output resampled lines, said selecting uses said phase at a second resolution which is coarser than said first resolution, and
- (c) selecting poly-phase filters from said phase for vertical filtering of the resampled lines from step (b) to output a resampled image, said selecting uses said phase at a second resolution which is coarser than said first resolution.
An image resampler, comprising:
- (a) a phase generator;
- (b) a filter coefficient memory with address input coupled to a truncated output of said phase generator, said truncated output discarding the least significant bits of a phase generated by phase generator;
- and
- (c) a filter with an image input and filter coefficients stored in said memory.
Dependencies are inferred from the claim text.