Method for deriving an objective sharpness metric
AssigneeKoninklijke Philips Electronics N.V.
InventorNehal Dantwala
Life of this patent
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Abstract
A method is provided for deriving an objective sharpness metric for objectively determining the level of image sharpness of many and unspecific images having different degrees of sharpness. The method for deriving the objective sharpness metric utilizes sub-band frequency information and false edge information for both an original video sequence and a sharpened sequence to be scored.
Claims15
A method for optimizing the sharpening of a video sequence using an objective sharpness quality score derived from an objective sharpness metric for determining the sharpness quality level of video sequences having different degrees of sharpness, said method comprising the steps of;
- receiving as an input an original video sequence;
- processing the original video sequence to derive a sharpened video sequence;
- calculating a first spectral energy information in said sharpened video sequence;
- calculating a second spectral energy information in said original video sequence;
- calculating false edge information data in said sharpened video sequence;
- deriving said objective sharpness metric from said first and second spectral energy information and said false edge information, said objective sharpness metric providing said objective sharpness quality score representative of the quality of said sharpened video sequence;
- and
- re-processing the original video sequence using said objective sharpness quality score to derive an optimized sharpened video sequence.
A system for optimizing the sharpness quality level of a received video sequence, comprising:
- means for receiving an original video sequence;
- means for applying a sharpness enhancement function to said original video sequence to generate a sharpened video sequence;
- a processor for deriving an objective sharpness metric, said processor comprising:
- means for calculating a first spectral energy information indicative of the sharpened video sequence;
- means for calculating a second spectral energy information in said original video sequence;
- means for calculating false edge information data in said sharpened video sequence;
- and
- means for deriving said objective sharpness metric from said first and said second spectral energy information and said false edge information, said objective sharpness metric providing an objective sharpness quality score representative of the quality of said sharpened video sequence;
- and
- means for optimizing the sharpness quality level of said received video sequence using said objective sharpness metric.
A computer-readable medium comprising instructions which when executed on a processor, cause the processor to perform a method for deriving an objective sharpness metric for determining the sharpness quality level of video sequences having different degrees of sharpness, the method comprising the steps of:
- receiving as an input an original video sequence;
- processing the original video sequence to derive a sharpness video sequence;
- calculating a first spectral energy information in said sharpened video sequence for which a sharpness quality score is desired;
- calculating spectral energy information in said original video sequence;
- calculating false edge information data in said sharpened video sequence;
- and
- deriving said objective sharpness metric from said first and second spectral energy information and said false edge information, said objective sharpness metric providing an objective sharpness quality score representative of the quality of said sharpened video sequence.
Dependencies are inferred from the claim text.