Objective method and system for estimating perceived image and video sharpness
AssigneeKoninklijke Philips Electronics N.V.
InventorJorge E. Caviedes
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method and system for estimating the quality of video data without gaining access to the source data. The system is configured to perform a Fast Fourier Transform (FFT) from at least some of the pixel values of the image in at least the horizontal direction, and at most in the horizontal and vertical directions for the luminance and chrominance components. An average FFT is used to calculate kurtosis and skewness, then an image-quality metric is determined by calculating an offset from the kurtosis and skewness outputs.
Claims23
A method for estimating the sharpness quality of input-video data, the method comprising the steps of:
- converting said input-video data into corresponding digital-image data comprised of pixel values;
- generating Fast Fourier Transform (FFT) from at least some of said pixel values and computing an average FFT on said generated FFT;
- calculating a statistical reference using said average FTT;
- and,
- producing an image-quality metric from said calculated statistical reference.
A system for estimating the sharpness quality of input-video data, comprising:
- a converter for converting said input-video data into corresponding digital-image data comprised of image pixel values;
- an FFT generator, adapted to receive an output of said converter, for generating Fast Fourier Transform (FFT) from at least some of said image-pixel values and for computing an average FFT on said generated FFT;
- a statistical calculator for calculating a statistical reference based on said average FTT;
- and,
- an image-quality generator for producing an image-quality metric from said calculated statistical reference.
A machine-readable medium having stored thereon data representing sequences of instructions, and the sequences of instructions which, when executed by a processor, cause the processor to:
- convert an input-video data into corresponding digital-image data comprised of pixel values;
- generate Fast Fourier Transform (FFT) from at least some of said image pixel values and compute an average FFT on said generated FFT;
- calculate a statistical reference using said average FTT;
- and,
- produce an image-quality metric from said calculated statistical reference.
Dependencies are inferred from the claim text.