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US 2015/0030258 A1Published application
System and method of corner noise reduction in an image
AssigneeQUALCOMM Incorporated
InventorsYunqiang Chen, Xiaoyun Jiang
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Abstract
Systems and methods for reducing noise artifacts in an image are disclosed. A radial distance-based look up table may be used to calibrate a noise property change due to the vignette effect. Based on the look up table, a spatial varying noise reduction level is computed to correct the noise property distortion due to the image vignetting.
Claims20
A system for digital image noise reduction, comprising:
- a memory for storing image data, the image data comprising a plurality of pixels;
- and
- a processor configured to perform a method comprising
- determining a noise variance amplification factor for each pixel;
- determining a noise reduction level and an order to apply to each pixel;
- calculating the expected noise of each pixel;
- estimating a confidence factor of the expected noise based on a noise distribution of the image;
- performing noise reduction for each pixel of the image based on the expected noise, the confidence factor, the noise reduction level and the order to obtain noise reduced image data;
- and
- storing the noise reduced image data in the memory.
7 more elements
A processor for reducing noise artifacts in a digital image, the processor configured with a plurality of modules, comprising:
- a first module configured to determine noise artifacts in a digital image having a plurality of pixels;
- and
- a second module configured to determine an amplification factor for each pixel to compensate for image vignetting by reducing the determined noise artifacts by applying a noise filter having a spatially varying digital gain, such that noise artifacts near the center of the image are processed differently than the noise artifacts near the corners of the captured digital image.
A method of reducing noise artifacts in a captured digital image, comprising:
- determining noise artifacts in a digital image having a plurality of pixels;
- and
- applying a noise filter having a spatially varying digital gain to determine an amplification factor for each pixel to compensate for image vignetting in the digital image so that noise artifacts near the center of the image are processed differently than the noise artifacts near the corners of the captured digital image.
Dependencies are inferred from the claim text.