Noise estimation using bracketed image capture

A method for reducing noise in an image, comprising:

• receiving, at an operating system executing on a computer device, an in focus image and at least one out of focus image of a scene, wherein the out of focus image has a second value of at least one focus-related parameter offset from a first value of the at least one focus-related parameter used for the in focus image;
• estimating, by the operating system, a noise model of noise in at least a section of the out of focus image based at least in part on identifying a frequency spread of one or more frequency components and amplitudes of the noise;
• determining at least one parameter value for a filter based on the noise model;
• and
• generating a noise-reduced image by applying the filter with the at least one parameter value to the in focus image to reduce at least part of the noise in at least a corresponding section of the in focus image.

A non-transitory computer-readable medium instructions executable by a computer device, comprising:

• at least one instruction for causing the computer device to receive an in focus image and at least one out of focus image of a scene, wherein the out of focus image has a second value of at least one focus-related parameter offset from a first value of the at least one focus-related parameter used for the in focus image;
• at least one instruction for causing the computer device to estimate a noise model of noise in at least a section of the out of focus image based at least in part on identifying a frequency spread of one or more frequency components and amplitudes of the noise;
• at least one instruction for causing the computer device to determine at least one parameter value for a filter based on the noise model;
• and
• at least one instruction for causing the computer device to generate a noise-reduced image by applying the filter with the at least one parameter value to the in focus image to reduce at least part of the noise in at least a corresponding section of the in focus image.