System and method of correcting image artifacts

A system for correcting for color artifacts in an image, comprising:

• a detection module configured to detect at least one color artifact in an image comprising a plurality of pixels, the detection module further configured to generate a correction ratio map having an entry for each of a plurality of pixels in the image, the entry indicating a type of color artifact associated with a corresponding pixel;
• a correction module configured calculate a corrected chroma value of the corresponding pixel based at least partly on the entry, the entry indicating a type of color artifact associated with the corresponding pixel, the correction module further configured to select one of a plurality of directional median filters based on the entry to use to calculate a corrected chroma value, the correction module further configured to select a first directional median filter if the entry indicates that the corresponding pixel is associated with a color spot artifact and to select a second directional median filter if the entry indicates that the corresponding pixel is associated with a color aberration;
• and
• a verification module configured to verify the corrected chroma value to reduce introduction of additional artifacts or de-saturation of legitimate color features in a corrected image formed from the corrected chroma value.

A method for generating a correction ratio map for correcting color artifacts in an image, the method comprising:

• receiving image data comprising the image, the image comprising a luma component and two chroma components;
• convolving the luma component with at least one symmetric kernel to generate a color artifact map;
• generating a preliminary correction ratio map based at least partly on the color artifact map, wherein the preliminary correction ratio map contains an entry corresponding to each of a plurality of pixels of the image;
• performing a gray check on at least one of the chroma components;
• and
• updating the preliminary correction ratio map based at least partly on the gray check to exclude any non-color pixels from subsequent color correction, thereby generating a final correction ratio map.

A non-transitory computer-readable medium storing instructions which, when executed, cause at least one processor to perform a method comprising:

• receiving image data of an image, the image data including a luma (Y) component value and two chroma components values for each of the plurality of pixels in the image;
• detecting at least one color artifact based on both luma and chroma component values of the image data;
• generating a correction ratio map corresponding to the plurality of pixels in the image, the correction ratio map indicating the location of the at least one color artifact in the image data;
• applying a plurality of directional median filters to each chroma component to generate a plurality of median values for a subset of the chroma component values;
• for each of the subset of chroma component values, selecting one of the plurality of median values based at least partly on a corresponding correction ratio map entry;
• and
• outputting a corrected chroma value for the pixel based at least partly on the selected one of the plurality of median values.