Image signal processing
AssigneeUEA Enterprises Limited
InventorGraham Finlayson
Life of this patent
Estimating the term…
Abstract
An image signal is processed by deriving measurements representing the luminance of a signal; calculating values relating to the local mean, the local standard deviation, the local maximum and/or the local minimum; and computing therefrom local standard coordinates such as z-scores which are independent of brightness and contrast.
Claims20
A method of processing an image signal comprising deriving measurements of an input image signal including at least a measurement representing the luminance (1) of the signal, characterised in that the method comprises the further steps of calculating two of the following:
- the local mean, the local standard deviation, the local maximum and the local minimum of said measurements, computing therefrom local standard coordinates which are independent of brightness and contrast, and forming an output image signal from the standard coordinates.
A device for processing an image signal comprising means for deriving measurements of an image signal including at least a measurement representing the luminance of the signal;
- means for calculating two of the following:
- the local mean, the local standard deviation, the local maximum and the local minimum;
- and means for computing therefrom standard coordinates which are independent of brightness and contrast.
A method of electronically processing an input image signal, the method including the steps of:
- a. obtaining measurements of an input image signal, the measurements including at least a luminance measurement of the input image signal;
- b. calculating at least two of:
- (1) the local mean,
- (2) the local standard deviation,
- (3) the local maximum, and
- (4) the local minimum,
- of the measurements;
- c. determining from the calculations local standard coordinates which are independent of brightness and contrast;
- and
- d. displaying an output image signal obtained from the local standard coordinates.
Dependencies are inferred from the claim text.