Generating compound images having increased sharpness and reduced noise

A system, comprising:

• a memory storing processor-readable instructions;
• a processor coupled to the memory, operable to execute the instructions, and based at least in part on the execution of the instructions operable to perform operations comprising
• determining a comparison image signal comprising pixels with values respectively indexing values of pixels of a first image signal in relation to values of spatially corresponding pixels of a second image signal;
• filtering the comparison image signal with a spatial filter;
• and
• generating a compound image signal comprising pixels with values composed of contributions from the pixel values of the first image signal and the pixel values of the second image signal, wherein the contributions are functions of respective values of spatially corresponding pixels in the filtered comparison image signal in relation to values of noise variation in the filtered comparison image signal.

A non-transitory machine readable medium storing machine-readable instructions causing a machine to perform operations comprising:

• determining a comparison image signal comprising pixels with values respectively indexing values of pixels of a first image signal in relation to values of spatially corresponding pixels of a second image signal;
• filtering the comparison image signal with a spatial filter;
• and
• generating a compound image signal comprising pixels with values composed of contributions from the pixel values of the first image signal and the pixel values of the second image signal, wherein the contributions are functions of respective values of spatially corresponding pixels in the filtered comparison image signal in relation to values of noise variation in the filtered comparison image signal.