Digital signal processing for image filtering field

A processor-implemented system for processing a digital image to correct artifacts, the processor-implemented system comprising:

• a buffer;
• and
• a processor coupled to the buffer, the processor configured to:
• (a) receive a digital image comprising one or more artifact regions;
• (b) receive a first selection of a first encompassment measure that encompasses a largest artifact region of the one or more artifact regions;
• (c) blur a copy of the digital image using the first encompassment measure to generate a first blurred image that is stored in the buffer;
• (d) calculate:
• i. a first difference of Gaussians of the digital image from the first blurred image, and
• ii. a second difference of Gaussians of the first blurred image from the digital image;
• (e) composite, using equation C=α*B, where α is the first difference of Gaussians, B is a scaled version of the digital image, and result, C, is a first composited image;
• (f) composite, using equation E=A+C+(β*D), where A is the digital image, β is the second difference of Gaussians, D is a scaled version of C and is oppositely scaled than the scaling used for B, and result, E, is a second composited image;
• and
• (g) modify the digital image, when it is determined that there are one or more pixels of invariable values in a difference image that is generated by a difference of the digital image from the second composited image, wherein the modifying comprises:
• scaling one or more values of pixels in each of the one or more artifact regions to within a predefined factor of the invariable values, thereby generating a modified digital image, and wherein a correction to the artifacts in the digital image is provided in the modified digital image.

A processor-implemented method of processing a digital image to correct artifacts, the processor-implemented method comprising:

• (a) receiving, at a processor from a buffer, a digital image comprising one or more artifact regions;
• (b) receiving, at the processor, a first selection of a first encompassment measure that encompasses a largest artifact region of the one or more artifact regions;
• (c) blurring, by the processor, a copy of the digital image using the first encompassment measure to generate a first blurred image that is stored in the buffer;
• (d) calculating, by the processor,
• i. a first difference of Gaussians of the digital image from the first blurred image, and
• ii. a second difference of Gaussians of the first blurred image from the digital image;
• (e) compositing, by the processor, using equation C=α*B, where α is the first difference of Gaussians, B is a scaled version of the digital image, and result, C, is a first composited image;
• (f) compositing, by the processor, using equation E=A+C+(β*D), where A is the digital image, β is the second difference of Gaussians, D is a scaled version of C and is oppositely scaled than the scaling used for B, and result, E, is a second composited image;
• and
• (g) modifying, by the processor, the digital image, when it is determined that there are one or more voxels of invariable values in a difference image that is generated by a difference of the digital image from the second composited image, wherein the modifying comprises:
• scaling one or more values of voxels in each of the one or more artifact regions to within a predefined factor of the invariable values, thereby generating a modified digital image, and
• wherein a correction to the artifacts in the digital image is provided in the modified digital image.

A processor-implemented method of processing a digital image to correct artifacts, the processor-implemented method comprising:

• (a) receiving, at a processor from a buffer, a digital image comprising one or more artifact regions;
• (b) receiving, at the processor,
• i. a first selection of a first encompassment measure that encompasses a largest artifact region of the one or more artifact regions, and
• ii. a second selection of a second encompassment measure that is lesser than the first encompassment measure;
• (c) blurring, by the processor,
• i. a copy of the digital image using the first encompassment measure to generate a first blurred image that is stored in the buffer, and
• ii. a copy of the digital image using the second encompassment measure to generate a second blurred image is stored in the buffer;
• (d) calculating, by the processor,
• i. a first difference of Gaussians of either, the digital image or the second blurred image, from the first blurred image, and
• ii. a second difference of Gaussians of the first blurred image from either, the digital image or the second blurred image;
• (e) compositing, by the processor, using equation C=α*B, where α is the first difference of Gaussians, B is a scaled version of the digital image, and result, C, is a first composited image;
• (f) compositing, by the processor, using equation E=A+C+(β*D), where A is the digital image, β is the second difference of Gaussians, D is a scaled version of C and is oppositely scaled than the scaling used for B, and result, E, is a second composited image;
• (g) determining, by the processor, when there are one or more pixels of invariable values in a difference image that is generated by a difference of the digital image from the second composited image;
• and
• (h) modifying, by the processor, the digital image, when it is determined that there are one or more pixels of invariable values, wherein the modifying comprises:
• scaling one or more values of pixels in each of the one or more artifact regions to within a predefined factor of the invariable values, thereby generating a modified digital image, and wherein a modification to the artifacts in the digital image is provided in the modified digital image.