Device and method of image processing for denoising based on degree of concentration of contribution ratios of basis patterns

A method of image processing including:

• acquiring a plurality of basis patterns for converting a first region and a second region in a target image;
• calculating a contribution ratio of each of the plurality of basis patterns;
• selecting one or more of the plurality of basis patterns from higher contribution ratio to lower contribution ratio until a sum of contribution ratios of the selected basis patterns reaches a specific first threshold;
• generating a control signal having an intensity that increases with a number of the selected basis patterns;
• projecting a third region in the target image to the plurality of basis patterns to obtain a projection coefficient;
• reducing noise of the projection coefficient based on the intensity of the control signal, wherein an amount of reduction of the noise increases with the intensity of the control signal;
• and
• reconstructing the third region using the projection coefficient after the noise is reduced.

An image processing device comprising:

• a processor;
• and
• a memory that stores processor-executable instructions that, when executed by the processor, cause the processor to:
• acquire a plurality of basis patterns for converting a first region and a second region in a target image;
• calculate a contribution ratio of each of the plurality of basis patterns;
• select one or more of the plurality of basis patterns from higher contribution ratio to lower contribution ratio until a sum of contribution ratios of the selected basis patterns reaches a specific first threshold;
• generate a control signal of an intensity that increases with a number of the selected basis patterns;
• project a third region in the target image to the plurality of basis patterns to obtain a projection coefficient;
• reduce noise of the projection coefficient based on the intensity of the control signal, wherein an amount of reduction of the noise increases with the intensity of the control signal;
• and
• reconstruct the third region using the projection coefficient after the noise is reduced.