Systems and methods for automated video matting

A system comprising:

• at least one physical processor;
• and
• physical memory comprising computer-executable instructions that, when executed by the physical processor, cause the physical processor to:
• receive an instruction to distinguish a foreground subject within an image from a background of the image based at least in part on a trimap of the image, the trimap comprising:
• a categorization of one or more pixels of the image as foreground pixels;
• a categorization of one or more pixels of the image as background pixels;
• and
• a categorization of one or more pixels of the image as indeterminate pixels;
• determine, for each of the indeterminate pixels, using a chromatic-spatial distance metric, a distance of the indeterminate pixel from one or more of the foreground pixels and a distance of the indeterminate pixel from one or more of the background pixels, the chromatic-spatial distance metric aggregating a color distance and a spatial distance;
• and
• recategorize a subset of the indeterminate pixels as background pixels based at least in part on the subset of indeterminate pixels being closer to the one or more background pixels than to the one or more foreground pixels according to the chromatic-spatial distance metric.

A non-transitory computer-readable medium comprising one or more computer-executable instructions that, when executed by at least one processor of a computing device, cause the computing device to:

• receive an instruction to distinguish a foreground subject within an image from a background of the image based at least in part on a trimap of the image, the trimap comprising:
• a categorization of one or more pixels of the image as foreground pixels;
• a categorization of one or more pixels of the image as background pixels;
• and
• a categorization of one or more pixels of the image as indeterminate pixels;
• determine, for each of the indeterminate pixels, using a chromatic-spatial distance metric, a distance of the indeterminate pixel from one or more of the foreground pixels and a distance of the indeterminate pixel from one or more of the background pixels, the chromatic-spatial distance metric aggregating a color distance and a spatial distance;
• and
• recategorize a subset of the indeterminate pixels as background pixels based at least in part on the subset of indeterminate pixels being closer to the one or more background pixels than to the one or more foreground pixels according to the chromatic-spatial distance metric.