US 2017/0324914 A1Published application

Correcting disturbance in a pixel signal introduced by signal filtering in a digital camera

AssigneeGoPro, Inc.

InventorScott Patrick Campbell

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Abstract

A camera is configured with a disturbance correction engine that identifies and corrects disturbance introduced in image data when a filter is applied to the image data. The disturbance may take the form of overshoot noise, crosstalk noise, and/or low pass band energy. The disturbance correction engine determines an amount of energy deficit in the pass band and compensates for the deficit using the increase in energy in the side band. In operation, the disturbance correction engine processes the filtered image data in the frequency domain to adjust the amplitudes of the image coefficients. The adjusted image coefficients compensate for the deficit of energy in the pass band and also correct the disturbance caused by the overshoot and the crosstalk.

Claims20

Dependent claims

A camera, comprising:

an image sensor configured to capture light incident upon the image sensor to produce image data, the image data comprising a plurality of pixels;
and
a processor configured to:
access image data associated with a pixel, the image data having a first quantity of pass band energy,
generate filtered image data using one or more filters, the filtered image data having a second quantity of pass band energy that is less than the first quantity and having excess side band energy,
transform the filtered image data to generate a set of filtered image coefficients associated with the filtered image data, the set of filtered image coefficients being a representation of the filtered image data in the frequency domain,
adjust the set of filtered image coefficients to compensate for the second quantity of energy being lower than the first quantity of energy based on the excess side band energy to produce an adjusted set of filtered image coefficients,
transform the adjusted set of filtered image coefficients into the spatial domain to produce adjusted image data, and
process the adjusted image data to produce a digital image.

6 more elements

A method for capturing an image with a camera, the method comprising:

capturing, by an image sensor of the camera, light incident upon the image sensor to produce image data, the image data comprising a plurality of pixels;
accessing image data associated with a pixel, the image data having a first quantity of pass band energy;
generating, by a filter engine, filtered image data using one or more filters, the filtered image data having a second quantity of pass band energy that is less than the first quantity and having excess side band energy;
transforming the filtered image data to generate a set of filtered image coefficients associated with the filtered image data, the set of filtered image coefficients being a representation of the filtered image data in the frequency domain;
adjusting the set of filtered image coefficients to compensate for the second quantity of energy being lower than the first quantity of energy based on the excess side band energy to produce an adjusted set of filtered image coefficients;
transforming the adjusted set of filtered image coefficients into the spatial domain to produce adjusted image data;
and
processing the adjusted image data to produce a digital image.

5 more elements

Dependencies are inferred from the claim text.