Signal processing method, signal processing system, coefficient generating device, and digital camera
AssigneeNikon Corporation
InventorAkihiko Utsugi
Life of this patent
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Abstract
An estimated noise shape estimated to be included in the signal to be corrected is calculated based on a calibration signal including a noise correlating with the noise of the signal to be corrected so as to correct a noise of a signal to be corrected. A correction value of a noise shape is generated by attenuating an amplitude of the estimated noise shape, and the noise of the signal to be corrected is corrected by using the correction value of the noise shape thus generated.
Claims14
A signal processing method for correcting a noise of a signal to be corrected, comprising:
- calculating an estimated noise shape estimated to be included in the signal to be corrected based on a calibration signal including a noise correlating with the noise of the signal to be corrected;
- generating a correction value of a noise shape by attenuating an amplitude of the estimated noise shape;
- and
- correcting the noise of the signal to be corrected by using the correction value of the noise shape thus generated.
A signal processing method for correcting a noise of a signal to be corrected, comprising:
- generating a correction value of a noise shape based on a calibration signal including a noise correlating with a noise of the signal to be corrected, an average amplitude of a noise shape included correlatively in the signal to be corrected and the calibration signal, and information on an estimation error of an estimated noise shape estimated to be included in the signal to be corrected;
- and
- correcting the noise of the signal to be corrected by using the correction value of the noise shape thus generated.
A signal processing method for correcting a noise of a signal to be corrected, comprising:
- calculating an estimated noise shape by estimating a noise shape of the signal to be corrected based on a calibration signal including a noise correlating with the noise of the signal to be corrected;
- generating information on an estimation error of the estimated noise shape based on the estimated noise shape;
- generating a correction value of a noise shape by modifying the estimated noise shape based on the information on the estimation error of the estimated noise shape;
- and
- correcting a noise of a signal to be corrected by using the correction value of the noise shape.
A signal processing method for correcting a noise of a signal to be corrected, comprising:
- calculating a sum value by summing up signal values of a predetermined number of sum signals within a predetermined range of a calibration signal including a noise correlating with the signal to be corrected;
- calculating a correction value of a noise shape smaller than an average value of the signal values within the predetermined range by dividing the sum value by a predetermined value larger than the predetermined number of sum signals;
- and
- correcting the noise of the signal to be corrected by using the correction value of the noise shape.
A signal processing system for correcting a noise of an image to be corrected, comprising:
- a coefficient generating device;
- and
- a digital camera, wherein:
- the coefficient generating device comprises:
- a coefficient calculating section that calculates a coefficient for attenuating an amplitude of an estimated noise shape estimated to be included in an image to be corrected that is imaged by the digital camera;
- and
- an output section that outputs the coefficient calculated by the coefficient calculating section to the digital camera, and
- the digital camera comprises:
- a storing section that stores the coefficient input from the coefficient generating device;
- a calculating section that calculates an estimated noise shape estimated to be included in the image to be corrected based on a calibration image including a noise correlating with the noise of the image to be corrected;
- a generating section that generates a correction value of a noise shape by attenuating an amplitude of the estimated noise shape calculated with the calculating section by the coefficient stored in the storing section;
- and
- a noise correcting section that corrects the noise of the image to be corrected using the correction value of the noise shape generated with the generating section.
Dependencies are inferred from the claim text.